PRESSURE SENSOR CERAMIC MATERIAL AND PREPARATION METHOD THEREOF

Abstract

A pressure sensor ceramic material and a preparation method thereof, comprising: nano ceramic particles with a molecular formula CaCu.sub.3-xM.sub.xTi.sub.4-ySc.sub.yO.sub.12, wherein: 0<x≤1, 0.2≤y≤0.8, glass-phase nano-oxide particles with a molecular formula B.sub.2O.sub.3, AlN, BeO, polymethylformamide, polycrystalline diamond powder, microfiltration membrane polymer, and dimethylformamide The diamond powder coated with 10 μm to 20 μm of the sub-micron layer doped AlN and BeO prepared by the present disclosure can reduce the defect of uniform and isotropic crystal structure caused by gradient modification of CaCu.sub.3-xM.sub.xTi.sub.4-ySc.sub.yO.sub.12 by B.sub.2O.sub.3 glass-phase nano-oxide, reduces the stress concentration of the resulting pressure sensor ceramic material against impact and avoids the defect that the cross-section bonding degree decreases due to the grain boundary movement.

Claims

1. A pressure sensor ceramic material, by weight component, comprising: 45 parts to 50 parts of nano ceramic particles with a molecular formula CaCu.sub.3-xM.sub.xTi.sub.4-ySc.sub.yO.sub.12, wherein: 0<x≤1, 0.2≤y≤0.8, and an element M is Ni, Zr, Co, Sr; 20 parts to 25 parts of glass-phase nano-oxide particles with a molecular formula B.sub.2O.sub.3, wherein: an element A is Er, Fe, Cr or Bi; AlN: 15 parts to 20 parts; BeO: 8 parts to 12 parts; polymethylformamide: 20 parts to 30 parts; polycrystalline diamond powder: 10 parts to 15 parts; microfiltration membrane polymer: 55 parts to 65 parts; and dimethylformamide: 20 parts to 25 parts.

2. The pressure sensor ceramic material according to claim 1, wherein: a preparation method of CaCu.sub.3-xM.sub.xTi.sub.4-ySc.sub.yO.sub.12 nano ceramic particles comprises following steps: S1: dissolving calcium inorganic saline compound, copper inorganic saline compound and M element inorganic saline compound in ethanol at a molar ratio of 1:3-x:x to form first mixed precursor solution; S2: dissolving silane coupling agent and scandium inorganic saline compound in acetylacetone at a molar ratio of 4-y:y to form second mixed precursor solution; S3: stirring the first mixed precursor solution obtained in the S1 and the second mixed precursor solution obtained in the S2 at a temperature of 95° C. to 105° C. and at a revolution speed of 200 rpm to 300 rpm for 15 minutes, and adding ethanol solution dropwise during the stirring to form CaCu.sub.3-xM.sub.xTi.sub.4-ySc.sub.yO.sub.12 nanometer precursor gel; S4: drying the CaCu.sub.3-xM.sub.xTi.sub.4-ySc.sub.yO.sub.12 nanometer precursor obtained in the S3 in a nitrogen gas atmosphere at a temperature of 150° C. to 160° C. for 2 hours to 2.5 hours, and grounding by a planetary ball mill to obtain CaCu.sub.3-xM.sub.xTi.sub.4-ySc.sub.yO.sub.12 nanometer precursor powder; and S5: calcining the CaCu.sub.3-xM.sub.xTi.sub.4-ySc.sub.yO.sub.12 nanometer precursor powder at a temperature of 950° C. to 1150° C. for 1 hour to 1.5 hours, and preventing CaCu.sub.3-xM.sub.xTi.sub.4-ySc.sub.yO.sub.12 crystals from growing to obtain the CaCu.sub.3-xM.sub.xTi.sub.4-ySc.sub.yO.sub.12 nano ceramic particles.

3. The pressure sensor ceramic material according to claim 2, wherein: titanate coupling agent is one or more of tetraisopropyl di-titanate, isopropyl titanate, diisopropyl titanate or tetrabutyl orthotitanate.

4. The pressure sensor ceramic material according to claim 2, wherein: the copper inorganic saline compound is Cu(NO.sub.3)2.3H.sub.2O, Cu(CH.sub.3COO).sub.2.H.sub.2O, CuCl.sub.2.2H.sub.2O or CuSO.sub.4.5H.sub.2O; the calcium inorganic saline compound is Ca(NO.sub.3)2.4H.sub.2O, Ca(CH.sub.3COO)2.H.sub.2O, CaSO.sub.4.2H.sub.2O or CaCl.sub.2.6H.sub.2O.

5. The pressure sensor ceramic material according to claim 2, wherein: hydrates of the M element inorganic saline compound are Ni(NO.sub.3).sub.2.6H.sub.2O, Ni(CH.sub.3COO).sub.2.4H.sub.2O, NiSO.sub.4.6H.sub.2O, NiCl.sub.2.6H.sub.2O, Zr(NO.sub.3).sub.3.5H.sub.2O, Zr(SO.sub.4).sub.2.4H.sub.2O, ZrOCl.sub.2.8H.sub.2O, Co(NO.sub.3).sub.2.6H.sub.2O, Co(CH.sub.3COO).sub.2.4H.sub.2O, Co(SO.sub.4).sub.2.7H.sub.2O, CoCl.sub.2.6H.sub.2O, Sr(CH.sub.3COO).sub.2.2H.sub.2O or SrCl.sub.2.6H.sub.2O; and the scandium inorganic salts are ScCl.sub.3.6H.sub.2O, Sc.sub.2(SO.sub.4).sub.3.8H.sub.2O, Sc(CH.sub.3COO).sub.3.5H.sub.2O, Sc(NO.sub.3).sub.3.H.sub.2O.

6. The pressure sensor ceramic material according to claim 2, wherein: a volume fraction of the ethanol in the ethanol solution added dropwise in the step S3 is 20% to 40%.

7. The pressure sensor ceramic material according to claim 1, wherein: the polycrystalline diamond powder has a particle size of 15 μm to 25 μm.

8. The pressure sensor ceramic material according to claim 1, wherein: the microfiltration membrane polymer is one of polyphenylene sulfide, polyvinylidene fluoride, polysulfonated phenyl ether sulfone and polytetrafluoroethylene.

9. A preparation method of the pressure sensor ceramic material according to claim 1, comprising the following steps: M1: dissolving the polycrystalline diamond powder in concentrated NaOH solution with a concentration of 10M to 12M, after boiling at a temperature of 100° C. to 110° C., washing with distilled water three times, then immersing in HCl with a concentration of 2M to 5M, shaking under ultrasonic wave for 20 minutes to 30 minutes to obtain pretreated polycrystalline diamond powder; M2: mixing AlN of the weight component and BeO of the weight component with polymethylformamide of the weight component, and stirring at a temperature of 60° C. to 70° C. and at a revolution speed of 180 rpm to 230 rpm for 10 minutes to 15 minutes; M3: placing mixture obtained in the M2 and the pretreated polycrystalline diamond powder obtained in the M1 in a vacuum, vacuuming in an inert atmosphere at 10 MPa to 15 MPa, and heating at a heating rate of 20° C./min to a temperature of 350° C. to 400° C. and holding for 1.5 hours, continuing heating at the heating rate of 20° C./min to a temperature of 950° C. to 1000° C. and holding for 2 hours to 2.5 hours to obtain diamond powder coated with a sub-micron layer doped the AlN and the BeO, and the sub-micron layer is 10 μm to 20 μm; M4: mixing nano ceramic particles with the molecular formula CaCu.sub.3-xM.sub.xTi.sub.4-ySc.sub.yO.sub.12 of the weight component, B.sub.2O.sub.3 glass-phase nano-oxide particles of the weight component, and one-third of dimethylformamide of the weight component, stirring at a temperature of 50° C. to 70° C. and at a revolution speed of 150 rpm to 200 rpm for 30 minutes to 45 minutes, standing obtained mixture at a room temperature for 10 minutes, then centrifuging at a revolution speed of 3000 rpm to 4000 rpm for 5 minutes to 10 minutes, washing the obtained precipitate in the ethanol for 3 times, and then washing in the distilled water for 3 times to obtain B.sub.2O.sub.3 glass-phase nano-oxide particles modified CaCu.sub.3-xM.sub.xTi.sub.4-ySc.sub.yO.sub.12 gradient nanoparticles; and M5: mixing the B.sub.2O.sub.3 glass-phase nano-oxide particles modified CaCu.sub.3-xM.sub.xTi.sub.4-ySc.sub.yO.sub.12 gradient nanoparticle obtained in the M4 and remaining two-thirds of dimethylformamide of the weight component uniformly, and then mixing with microfiltration membrane polymer of the weight component and the diamond powder coated with the sub-micron layer doped the AlN and the BeO obtained in the M3, stirring at a temperature of 55° C. to 75° C. and at a revolution speed of 250 rpm to 300 rpm for 30 minutes to 45 minutes, then drying under nitrogen gas flow at a temperature of 70° C. to 80° C. to obtain the pressure sensor ceramic material.

10. The preparation method of the pressure sensor ceramic material according to claim 9, wherein: the inert atmosphere used for vacuuming in the M3 is an argon atmosphere, and a flow rate is 160 ml/min to 200 ml/min.

Description

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] The technical solution in the embodiment of the present disclosure will be clearly and completely described in connection with the embodiment of the present disclosure. It is obvious that the described embodiment is only part of the embodiment of the present disclosure and not all of the embodiments. Based on the embodiments of the present disclosure, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present disclosure.

Embodiment 1

[0037] A pressure sensor ceramic material is provided in the embodiment, by weight component, comprising:

[0038] nano ceramic particles with a molecular formula CaCu.sub.2(Ni.sub.0.6Co.sub.0.4)Ti.sub.3.8Sc.sub.0.2O.sub.12: 45 parts;

[0039] glass-phase nano-oxide particles with a molecular formula Er.sub.2O.sub.3: 20 parts;

[0040] AlN: 15 parts;

[0041] BeO: 8 parts;

[0042] polymethylformamide: 20 parts;

[0043] polycrystalline diamond powder with a particle size of 15 μm: 10 parts;

[0044] polyvinylidene fluoride: 55 parts; and

[0045] dimethylformamide 20 parts.

[0046] Wherein: a preparation method of CaCu.sub.2(Ni.sub.0.6Co.sub.0.4)Ti.sub.3.8Sc.sub.0.2O.sub.12 nano ceramic particles comprises following steps:

[0047] S1: dissolving Ca(CH.sub.3COO).sub.2.H.sub.2, Cu(CH.sub.3COO).sub.2.H.sub.2O, Ni(CH.sub.3COO).sub.2.4H.sub.2O and Co(CH.sub.3COO).sub.2.4H.sub.2O in ethanol at a molar ratio of 1:2:0.6:0.4 to form first mixed precursor solution;

[0048] S2: dissolving tetrabutyl orthotitanate and Sc(CH.sub.3COO).sub.3.5H.sub.2O in acetylacetone at a molar ratio of 3.8:0.2 to form second mixed precursor solution;

[0049] S3: stirring the first mixed precursor solution obtained in the S1 and the second mixed precursor solution obtained in the S2 at a temperature of 95° C. and at a revolution speed of 200 rpm for 15 minutes, and adding ethanol solution with a volume fraction of 20% dropwise during the stirring to form CaCu.sub.2(Ni.sub.0.6Co.sub.0.4)Ti.sub.3.8Sc.sub.0.2O.sub.12 nanometer precursor gel;

[0050] S4: drying the CaCu.sub.2(Ni.sub.0.6Co.sub.0.4)Ti.sub.3.8Sc.sub.0.2O.sub.12 nanometer precursor obtained in the S3 in a nitrogen gas atmosphere at a temperature of 150° C. for 2 hours, and grounding by a planetary ball mill to obtain CaCu.sub.2(Ni.sub.0.6Co.sub.0.4)Ti.sub.3.8Sc.sub.0.2O.sub.12 nanometer precursor powder; and

[0051] S5: calcining the CaCu.sub.2(Ni.sub.0.6Co.sub.0.4)Ti.sub.3.8Sc.sub.0.2O.sub.12 nanometer precursor powder at a temperature of 950° C. for an hour, and preventing CaCu.sub.2(Ni.sub.0.6Co.sub.0.4)Ti.sub.3.8Sc.sub.0.2O.sub.12 crystals from growing to obtain the CaCu.sub.2(Ni.sub.0.6Co.sub.0.4)Ti.sub.3.8Sc.sub.0.2O.sub.12 nano ceramic particles.

[0052] A preparation method of the pressure sensor ceramic material is provided in the embodiment, comprising the following steps:

[0053] M1: dissolving 10 parts of the polycrystalline diamond powder with a particle size of 15 μm in concentrated NaOH solution with a concentration of 10M, after boiling at a temperature of 100° C., washing with distilled water three times, then immersing in HCl with a concentration of 2M, shaking under ultrasonic wave for 20 minutes to obtain pretreated polycrystalline diamond powder;

[0054] M2: mixing 15 parts of the AlN and 8 parts of the BeO with 20 parts of the polymethylformamide, and stirring at a temperature of 61° C. and at a revolution speed of 180 rpm for 10 minutes;

[0055] M3: placing mixture obtained in the M2 and the pretreated polycrystalline diamond powder obtained in the M1 in a vacuum, vacuuming in an argon atmosphere with a flow rate of 160 ml/min at 10 MPa, and heating at a heating rate of 20° C./min to a temperature of 350° C. and holding for 1.5 hours, continuing heating at the heating rate of 20° C./min to a temperature of 950° C. and holding for 2 hours to obtain diamond powder coated with a sub-micron layer doped the AlN and the BeO, and the sub-micron layer is 10 μm;

[0056] M4: mixing the 45 parts of nano ceramic particles with the molecular formula CaCu.sub.2(Ni.sub.0.6Co.sub.0.4)Ti.sub.3.8Sc.sub.0.2O.sub.12, the Er.sub.2O.sub.3 glass-phase nano-oxide particles of the weight component, and 6.67 parts of the dimethylformamide, stirring at a temperature of 50° C. and at a revolution speed of 150 rpm for 30 minutes, standing obtained mixture at a room temperature for 10 minutes, then centrifuging at a revolution speed of 3000 rpm for 5 minutes, washing the obtained precipitate in the ethanol for 3 times, and then washing in the distilled water for 3 times to obtain Er.sub.2O.sub.3 glass-phase nano-oxide particles modified CaCu.sub.2(Ni.sub.0.6Co.sub.0.4)Ti.sub.3.8Sc.sub.0.2O.sub.12 gradient nanoparticles; and

[0057] M5: mixing the Er.sub.2O.sub.3 glass-phase nano-oxide particles modified CaCu.sub.2(Ni.sub.0.6Co.sub.0.4)Ti.sub.3.8Sc.sub.0.2O.sub.12 gradient nanoparticle obtained in the M4 and remaining 13.33 parts of the dimethylformamide uniformly, and then mixing with the 55 parts of the polyvinylidene fluoride and the diamond powder coated with the sub-micron layer doped the AlN and the BeO obtained in the M3, stirring at a temperature of 55° C. and at a revolution speed of 250 rpm for 30 minutes, then drying under nitrogen gas flow at a temperature of 70° C. to obtain the pressure sensor ceramic material.

Embodiment 2

[0058] A pressure sensor ceramic material is provided in the embodiment, by weight component, comprising:

[0059] nano ceramic particles with a molecular formula CaCu.sub.2.5Zr.sub.0.5Ti.sub.3.5Sc.sub.0.5O.sub.12: 50 parts;

[0060] glass-phase nano-oxide particles with a molecular formula Bi.sub.2O.sub.3: 25 parts;

[0061] AlN: 20 parts;

[0062] BeO: 12 parts;

[0063] polymethylformamide 30 parts;

[0064] polycrystalline diamond powder with a particle size of 20 μm: 15 parts;

[0065] polysulfonated phenyl ether sulfone: 65 parts; and

[0066] dimethylformamide 25 parts.

[0067] Wherein: a preparation method of CaCu.sub.2.5Zr.sub.0.5Ti.sub.3.5Sc.sub.0.5O.sub.12 nano ceramic particles comprises following steps:

[0068] S1: dissolving CaSO.sub.4.2H.sub.2O, CuSO.sub.4.5H.sub.2O, and Zr(SO.sub.4).sub.2.4H.sub.2O in ethanol at a molar ratio of 1:2.5:0.5 to form first mixed precursor solution;

[0069] S2: dissolving tetraisopropyl di-titanate and Sc.sub.2(SO.sub.4).sub.3.8H.sub.2O in acetylacetone at a molar ratio of 7:1 to form second mixed precursor solution;

[0070] S3: stirring the first mixed precursor solution obtained in the S1 and the second mixed precursor solution obtained in the S2 at a temperature of 105° C. and at a revolution speed of 300 rpm for 15 minutes, and adding ethanol solution with a volume fraction of 40% dropwise during the stirring to form CaCu.sub.2.5Zr.sub.0.5Ti.sub.3.5Sc.sub.0.5O.sub.12 nanometer precursor gel;

[0071] S4: drying the CaCu.sub.2.5Zr.sub.0.5Ti.sub.3.5Sc.sub.0.5O.sub.12 nanometer precursor obtained in the S3 in a nitrogen gas atmosphere at a temperature of 160° C. for 2.5 hours, and grounding by a planetary ball mill to obtain CaCu.sub.2.5Zr.sub.0.5Ti.sub.3.5Sc.sub.0.5O.sub.12 nanometer precursor powder; and

[0072] S5: calcining the CaCu.sub.2.5Zr.sub.0.5Ti.sub.3.5Sc.sub.0.5O.sub.12 nanometer precursor powder at a temperature of 1150° C. for 1.5 hours, and preventing CaCu.sub.2.5Zr.sub.0.5Ti.sub.3.5Sc.sub.0.5O.sub.12 crystals from growing to obtain the CaCu.sub.2.5Zr.sub.0.5Ti.sub.3.5Sc.sub.0.5O.sub.12 nano ceramic particles.

[0073] A preparation method of the pressure sensor ceramic material is provided in the embodiment, comprising the following steps:

[0074] M1: dissolving 15 parts of the polycrystalline diamond powder with a particle size of 20 μm in concentrated NaOH solution with a concentration of 12M, after boiling at a temperature of 110° C., washing with distilled water three times, then immersing in HCl with a concentration of 5M, shaking under ultrasonic wave for 30 minutes to obtain pretreated polycrystalline diamond powder;

[0075] M2: mixing 20 parts of the AlN and 12 parts of the BeO with 30 parts of the polymethylformamide, and stirring at a temperature of 70° C. and at a revolution speed of 230 rpm for 15 minutes;

[0076] M3: placing mixture obtained in the M2 and the pretreated polycrystalline diamond powder obtained in the M1 in a vacuum, vacuuming in an argon atmosphere with a flow rate of 180 ml/min at 15 MPa, and heating at a heating rate of 20° C./min to a temperature of 400° C. and holding for 1.5 hours, continuing heating at the heating rate of 20° C./min to a temperature of 1000° C. and holding for 2.5 hours to obtain diamond powder coated with a sub-micron layer doped the AlN and the BeO, and the sub-micron layer is 15 μm;

[0077] M4: mixing the 50 parts of nano ceramic particles with the molecular formula CaCu.sub.2.5Zr.sub.0.5Ti.sub.3.5Sc.sub.0.5O.sub.12, 25 parts of the Bi.sub.2O.sub.3 glass-phase nano-oxide particles, and 11.67 parts of the dimethylformamide, stirring at a temperature of 70° C. and at a revolution speed of 200 rpm for 45 minutes, standing obtained mixture at a room temperature for 10 minutes, then centrifuging at a revolution speed of 4000 rpm for 10 minutes, washing the obtained precipitate in the ethanol for 3 times, and then washing in the distilled water for 3 times to obtain Bi.sub.2O.sub.3 glass-phase nano-oxide particles modified CaCu.sub.2.5Zr.sub.0.5Ti.sub.3.5Sc.sub.0.5O.sub.12 gradient nanoparticles; and

[0078] M5: mixing the Bi.sub.2O.sub.3 glass-phase nano-oxide particles modified CaCu.sub.2.5Zr.sub.0.5Ti.sub.3.5Sc.sub.0.5O.sub.12 gradient nanoparticle obtained in the M4 and remaining 13.33 parts of the dimethylformamide uniformly, and then mixing with the 65 parts of the polysulfonated phenyl ether sulfone and the diamond powder coated with the sub-micron layer doped the AlN and the BeO obtained in the M3, stirring at a temperature of 75° C. and at a revolution speed of 300 rpm for 45 minutes, then drying under nitrogen gas flow at a temperature of 80° C. to obtain the pressure sensor ceramic material.

Embodiment 3

[0079] A pressure sensor ceramic material is provided in the embodiment, by weight component, comprising:

[0080] nano ceramic particles with a molecular formula CaCu.sub.2.9Sr.sub.0.1Ti.sub.3.2Sc.sub.0.8O.sub.12: 47.5 parts;

[0081] glass-phase nano-oxide particles with a molecular formula Cr.sub.2O.sub.3: 22.5 parts;

[0082] AlN: 17.5 parts;

[0083] BeO: 10 parts;

[0084] polymethylformamide 25 parts;

[0085] polycrystalline diamond powder with a particle size of 25 μm: 12.5 parts;

[0086] polyphenylene sulfide: 25 parts;

[0087] polytetrafluoroethylene: 25 parts; and

[0088] dimethylformamide 22.5 parts.

[0089] Wherein: a preparation method of CaCu.sub.2.9Sr.sub.0.1Ti.sub.3.2Sc.sub.0.8O.sub.12 nano ceramic particles comprises following steps:

[0090] S1: dissolving CaCl.sub.2.6H.sub.2O, CuCl.sub.2.2H.sub.2O, and SrCl.sub.2.6H.sub.2O in ethanol at a molar ratio of 1:2.9:0.1 to form first mixed precursor solution;

[0091] S2: dissolving diisopropyl titanate and ScCl.sub.3.6H.sub.2O in acetylacetone at a molar ratio of 4:1 to form second mixed precursor solution;

[0092] S3: stirring the first mixed precursor solution obtained in the S1 and the second mixed precursor solution obtained in the S2 at a temperature of 100° C. and at a revolution speed of 250 rpm for 15 minutes, and adding ethanol solution dropwise during the stirring to form CaCu.sub.2.9Sr.sub.0.1Ti.sub.3.2Sc.sub.0.8O.sub.12 nanometer precursor gel;

[0093] S4: drying the CaCu.sub.2.9Sr.sub.0.1Ti.sub.3.2Sc.sub.0.8O.sub.12nanometer precursor obtained in the S3 in a nitrogen gas atmosphere at a temperature of 155° C. for 2.25 hours, and grounding by a planetary ball mill to obtain CaCu.sub.2.9Sr.sub.0.1Ti.sub.3.2Sc.sub.0.8O.sub.12 nanometer precursor powder; and

[0094] S5: calcining the CaCu.sub.2.9Sr.sub.0.1Ti.sub.3.2Sc.sub.0.8O.sub.12 nanometer precursor powder at a temperature of 1000° C. for 1.25 hours, and preventing CaCu.sub.2.9Sr.sub.0.1Ti.sub.3.2Sc.sub.0.8O.sub.12 crystals from growing to obtain the CaCu.sub.2.9Sr.sub.0.1Ti.sub.3.2Sc.sub.0.8O.sub.12 nano ceramic particles.

[0095] A preparation method of the pressure sensor ceramic material is provided in the embodiment, comprising the following steps:

[0096] M1: dissolving 12.5 parts of the polycrystalline diamond powder with a particle size of 25 μm in concentrated NaOH solution with a concentration of 11M, after boiling at a temperature of 105° C., washing with distilled water three times, then immersing in HCl with a concentration of 3.5M, shaking under ultrasonic wave for 25 minutes to obtain pretreated polycrystalline diamond powder;

[0097] M2: mixing 17.5 parts of the AlN and 10 parts of the BeO with polymethylformamide, of the weight component and stirring at a temperature of 65° C. and at a revolution speed of 205 rpm for 12 minutes;

[0098] M3: placing mixture obtained in the M2 and the pretreated polycrystalline diamond powder obtained in the M1 in a vacuum, vacuuming in an argon atmosphere with a flow rate of 200 ml/min at 12.5 MPa, and heating at a heating rate of 20° C./min to a temperature of 375° C. and holding for 1.5 hours, continuing heating at the heating rate of 20° C./min to a temperature of 980° C. and holding for 2.25 hours to obtain diamond powder coated with a sub-micron layer doped the AlN and the BeO, and the sub-micron layer is 20 μm;

[0099] M4: mixing the 47.5 parts of nano ceramic particles with the molecular formula CaCu.sub.2.9Sr.sub.0.1Ti.sub.3.2Sc.sub.0.8O.sub.12, 22.5 parts of the Cr.sub.2O.sub.3 glass-phase nano-oxide particles, and 7.5 parts of the dimethylformamide, stirring at a temperature of 65° C. and at a revolution speed of 175 rpm for 38 minutes, standing obtained mixture at a room temperature for 10 minutes, then centrifuging at a revolution speed of 4000 rpm for 10 minutes, washing the obtained precipitate in the ethanol for 3 times, and then washing in the distilled water for times to obtain Cr.sub.2O.sub.3 glass-phase nano-oxide particles modified CaCu.sub.2.9Sr.sub.0.1Ti.sub.3.2Sc.sub.0.8O.sub.12 gradient nanoparticles; and

[0100] M5: mixing the Cr.sub.2O.sub.3 glass-phase nano-oxide particles modified CaCu.sub.2.9Sr.sub.0.1Ti.sub.3.2Sc.sub.0.8O.sub.12 gradient nanoparticle obtained in the M4 and remaining 15 parts of the dimethylformamide uniformly, and then mixing with the 25 parts of the polyphenylene sulfide, 25 parts of the polytetrafluoroethylene and the diamond powder coated with the sub-micron layer doped the AlN and the BeO obtained in the M3, stirring at a temperature of 65° C. and at a revolution speed of 275 rpm for 37 minutes, then drying under nitrogen gas flow at a temperature of 75° C. to obtain the pressure sensor ceramic material.

Comparative Embodiment 1

[0101] The present comparative embodiment differs from Embodiment 1 in: AlN and BeO are not used and by weight component, comprising:

[0102] nano ceramic particles with a molecular formula CaCu.sub.2(Ni.sub.0.6Co.sub.0.4)Ti.sub.3.8Sc.sub.0.2O.sub.12: 45 parts;

[0103] glass-phase nano-oxide particles with a molecular formula Er.sub.2O.sub.3: 20 parts;

[0104] polymethylformamide: 20 parts;

[0105] polycrystalline diamond powder with a particle size of 15 μm: 10 parts;

[0106] polyvinylidene fluoride: 55 parts; and

[0107] dimethylformamide 20 parts.

[0108] Further, the final production steps comprises the following steps:

[0109] M1: dissolving 10 parts of the polycrystalline diamond powder with a particle size of 15 μm in concentrated NaOH solution with a concentration of 10M, after boiling at a temperature of 100° C., washing with distilled water three times, then immersing in HCl with a concentration of 2M, shaking under ultrasonic wave for 20 minutes to obtain pretreated polycrystalline diamond powder;

[0110] M2: mixing the mixture obtained in the M1 with 20 parts of the polymethylformamide, and stirring at a temperature of 61° C. and at a revolution speed of 180 rpm for 10 minutes;

[0111] M3: placing mixture obtained in the M2 and the pretreated polycrystalline diamond powder obtained in the M1 in a vacuum, vacuuming in an argon atmosphere with a flow rate of 160 ml/min at 10 MPa, and heating at a heating rate of 20° C./min to a temperature of 350° C. and holding for 1.5 hours, continuing heating at the heating rate of 20° C./min to a temperature of 950° C. and holding for 2 hours to obtain diamond powder coated with a sub-micron layer doped the AlN and the BeO, and the sub-micron layer is 10 μm;

[0112] M4: mixing the 45 parts of nano ceramic particles with the molecular formula CaCu.sub.2(Ni.sub.0.6Co.sub.0.4)Ti.sub.3.8Sc.sub.0.2O.sub.12, the Er.sub.2O.sub.3 glass-phase nano-oxide particles of the weight component, and 6.67 parts of the dimethylformamide, stirring at a temperature of 50° C. and at a revolution speed of 150 rpm for 30 minutes, standing obtained mixture at a room temperature for 10 minutes, then centrifuging at a revolution speed of 3000 rpm for 5 minutes, washing the obtained precipitate in the ethanol for 3 times, and then washing in the distilled water for 3 times to obtain Er.sub.2O.sub.3 glass-phase nano-oxide particles modified CaCu.sub.2(Ni.sub.0.6Co.sub.0.4)Ti.sub.3.8Sc.sub.0.2O.sub.12 gradient nanoparticles; and

[0113] M5: mixing the Er.sub.2O.sub.3 glass-phase nano-oxide particles modified CaCu.sub.2(Ni.sub.0.6Co.sub.0.4)Ti.sub.3.8Sc.sub.0.2O.sub.12 gradient nanoparticle obtained in the M4 and remaining 13.33 parts of the dimethylformamide uniformly, and then mixing with the 55 parts of the polyvinylidene fluoride and the diamond powder coated with the sub-micron layer doped the AlN and the BeO obtained in the M3, stirring at a temperature of 55° C. and at a revolution speed of 250 rpm for 30 minutes, then drying under nitrogen gas flow at a temperature of 70° C. to obtain the pressure sensor ceramic material.

[0114] Wherein, the preparation method of nano ceramic particles with the formula CaCu2(Ni0.6Co0.4)Ti3.8Sc0.2O12 is carried out as described in Embodiment 1.

Comparative Embodiment 2

[0115] The present comparative embodiment differs from Embodiment 1 in that the composition of Er.sub.2O.sub.3 glass-phase nano-oxide particles is not used and by weight component, comprising:

[0116] nano ceramic particles with a molecular formula CaCu.sub.2(Ni.sub.0.6Co.sub.0.4)Ti.sub.3.8Sc.sub.0.2O.sub.12: 45 parts;

[0117] AlN: 15 parts;

[0118] BeO: 8 parts;

[0119] polymethylformamide: 20 parts;

[0120] polycrystalline diamond powder with a particle size of 15 μm: 10 parts;

[0121] polyvinylidene fluoride: 55 parts; and

[0122] dimethylformamide 20 parts.

[0123] Further, the final production steps comprises the following steps:

[0124] M1: dissolving 10 parts of the polycrystalline diamond powder with a particle size of 15 μm in concentrated NaOH solution with a concentration of 10M, after boiling at a temperature of 100° C., washing with distilled water three times, then immersing in HCl with a concentration of 2M, shaking under ultrasonic wave for 20 minutes to obtain pretreated polycrystalline diamond powder;

[0125] M2: mixing 15 parts of the AlN and 8 parts of the BeO with 20 parts of the polymethylformamide, and stirring at a temperature of 61° C. and at a revolution speed of 180 rpm for 10 minutes;

[0126] M3: placing mixture obtained in the M2 and the pretreated polycrystalline diamond powder obtained in the M1 in a vacuum, vacuuming in an argon atmosphere with a flow rate of 160 ml/min at 10 MPa, and heating at a heating rate of 20° C./min to a temperature of 350° C. and holding for 1.5 hours, continuing heating at the heating rate of 20° C./min to a temperature of 950° C. and holding for 2 hours to obtain diamond powder coated with a sub-micron layer doped the AlN and the BeO, and the sub-micron layer is 10 μm;

[0127] M4: mixing the 45 parts of the CaCu.sub.2(Ni.sub.0.6Co.sub.0.4)Ti.sub.3.8Sc.sub.0.2O.sub.12 nano ceramic particles with 20 parts of the dimethylformamide uniformly, and then mixing with the 55 parts of the polyvinylidene fluoride and the diamond powder coated with the sub-micron layer doped the AlN and the BeO obtained in the M3, stirring at a temperature of 55° C. and at a revolution speed of 250 rpm for 30 minutes, then drying under nitrogen gas flow at a temperature of 70° C. to obtain the pressure sensor ceramic material.

[0128] Wherein, the preparation method of nano ceramic particles with the formula CaCu.sub.2(Ni0..sub.6Co.sub.0.4)Ti.sub.3.8Sc.sub.0.2O.sub.12 is carried out as described in Embodiment 1.

Comparative Embodiment 3

[0129] the present comparative embodiment differs from Embodiment 1 in that CaCu.sub.3Ti4O12 nano ceramic particles are used instead of the self-made CaCu.sub.2.5Ni.sub.0.5Ti.sub.4O.sub.12 nano ceramic particles and by weight component, comprising:

[0130] CaCu.sub.3Ti.sub.4O.sub.12 nano ceramic particles: 45 parts;

[0131] glass-phase nano-oxide particles with a molecular formula Er.sub.2O.sub.3: 20 parts;

[0132] AlN: 15 parts;

[0133] BeO: 8 parts;

[0134] polymethylformamide: 20 parts;

[0135] polycrystalline diamond powder with a particle size of 15 μm: 10 parts;

[0136] polyvinylidene fluoride: 55 parts; and

[0137] dimethylformamide 20 parts.

[0138] M1: dissolving 10 parts of the polycrystalline diamond powder with a particle size of 15 μm in concentrated NaOH solution with a concentration of 10M, after boiling at a temperature of 100° C., washing with distilled water three times, then immersing in HCl with a concentration of 2M, shaking under ultrasonic wave for 20 minutes to obtain pretreated polycrystalline diamond powder;

[0139] M2: mixing 15 parts of the AlN and 8 parts of the BeO with 20 parts of the polymethylformamide, and stirring at a temperature of 61° C. and at a revolution speed of 180 rpm for 10 minutes;

[0140] M3: placing mixture obtained in the M2 and the pretreated polycrystalline diamond powder obtained in the M1 in a vacuum, vacuuming in an argon atmosphere with a flow rate of 160 ml/min at 10 MPa, and heating at a heating rate of 20° C./min to a temperature of 350° C. and holding for 1.5 hours, continuing heating at the heating rate of 20° C./min to a temperature of 950° C. and holding for 2 hours to obtain diamond powder coated with a sub-micron layer doped the AlN and the BeO, and the sub-micron layer is 10 μm;

[0141] M4: mixing the 45 parts of nano ceramic particles with the molecular formula CaCu.sub.2(Ni.sub.0.6Co.sub.0.4)Ti.sub.3.8Sc.sub.0.2O.sub.12, the Er.sub.2O.sub.3 glass-phase nano-oxide particles of the weight component, and 6.67 parts of the dimethylformamide, stirring at a temperature of 50° C. and at a revolution speed of 150 rpm for 30 minutes, standing obtained mixture at a room temperature for 10 minutes, then centrifuging at a revolution speed of 3000 rpm for 5 minutes, washing the obtained precipitate in the ethanol for 3 times, and then washing in the distilled water for 3 times to obtain Er.sub.2O.sub.3 glass-phase nano-oxide particles modified CaCu.sub.3Ti.sub.4O.sub.12 gradient nanoparticles; and

[0142] M5: mixing the Er.sub.2O.sub.3 glass-phase nano-oxide particles modified CaCu.sub.3Ti.sub.4O.sub.12 gradient nanoparticle obtained in the M4 and remaining 13.33 parts of the dimethylformamide uniformly, and then mixing with the 55 parts of the polyvinylidene fluoride and the diamond powder coated with the sub-micron layer doped the AlN and the BeO obtained in the M3, stirring at a temperature of 55° C. and at a revolution speed of 250 rpm for 30 minutes, then drying under nitrogen gas flow at a temperature of 70° C. to obtain the pressure sensor ceramic material.

Test Embodiment

[0143] The mechanical strength, resistivity (representing insulation), porosity, dielectric constant, dielectric loss, leakage current, and coefficient of thermal expansion of the pressure sensor ceramic material of Embodiment 1 to Embodiment 3 and Comparative Embodiment 1 to Embodiment 3 are tested, and the results are shown in Table 1.

[0144] Although the present disclosure has been described with reference to the preferred embodiments, various modifications can be made to it without departing from the scope of the present disclosure and the components and parameters therein can be replaced with equivalents. Specifically, as long as there is no conflict of technical solutions, the various technical features mentioned in the various embodiments can be combined in any manner. The present disclosure is not limited to the specific embodiments disclosed herein, but comprises all technical solutions falling within the scope of the claims.

TABLE-US-00001 TABLE 1 Comparative Comparative Comparative Embodi- Embodi- Embodi- Embodi- Embodi- Embodi- ment ment ment ment ment ment 1 2 3 1 2 3 Mechanical 36 38 45 24 21 19 strength Shao A Shao A Shao A Shao A Shao A Shao A Resistivity 126 × 137 × 142 × 306 × 573 × 231 × (Ω .Math. m) 10.sup.−7 10.sup.−7 10.sup.−7 10.sup.−8 10.sup.−7 10.sup.−8 Porosity 32.15%   34.11%   37.02%   10.10%   9.64%  6.98%  Dielectric 1406 1432 1542 336 167 252 Constant Dielectric 0.1397% 0.1307% 0.1125% 0.3268% 0.3744% 0.5026% Loss Leakage 153 μA 147 μA 142 μA 265 μA 278 μA 302 μA Current Coefficient 8.67 × 8.35 × 7.6 × 21.87 × 18.23 × 16.45 × of Thermal 10.sup.−6/K 10.sup.−6/K 10.sup.−6/K 10.sup.−6/K 10.sup.−6/K 10.sup.−6/K Expansion