Method for fabricating thermal barrier coating having self-repair and temperature-sensitive functions

Abstract

A method for preparing a thermal barrier coating (TBC) material includes: spraying a metal mixture onto a surface of an alloy using supersonic flame spraying or explosive spraying to form a bottom layer; spraying an yttria-stabilized zirconia (YSZ) precursor sol onto the bottom layer using liquid plasma spraying to form an intermediate layer; and spraying a ceramic composite including SiO.sub.2 and La—Ce—Zr—O using plasma spraying or explosive spraying to form a surface layer.

Claims

1. A method for preparing a thermal barrier coating (TBC) material, comprising: spraying a metal mixture onto a surface of an alloy using supersonic flame spraying or explosive spraying to form a bottom layer; spraying an yttria-stabilized zirconia (YSZ) precursor sol onto the bottom layer using liquid plasma spraying to form an intermediate layer; and spraying a ceramic composite including SiO.sub.2 and La—Ce—Zr—O using plasma spraying or explosive spraying to form a surface layer, wherein the YSZ precursor sol is prepared by: mixing 33-37 wt % of Er.sub.2O.sub.3 and 63-67 wt % of hydrochloric acid to form a first mixed solution; mixing 28-30 wt % ZrOCl.sub.2.Math.8H.sub.2O, 1 wt % Y.sub.2O.sub.3, and 69-71 wt % deionized water to form a second mixed solution; gradually adding an ammonia solution having a pH of 10 into a mixture of the first mixed solution and the second mixed solution; and heating the mixture of the first mixed solution and the second mixed solution under stirring to form the YSZ precursor sol having a pH of 3-6.

2. The method according to claim 1, wherein the metal mixture is powder and the ceramic composite is powder.

3. The method according to claim 1, wherein the metal mixture is prepared by: mixing 82-84 wt % of Ni powder, 6-7 wt % of Co powder, 1-2 wt % of Fe powder, 2-3 wt % of Cr powder, 0.1-0.5 wt % of Si powder, 2-3 wt % of Al powder, and 0.5-6.9 wt % of Ti powder, each having a particle size of 0.5-1 μm, to obtain a Ni—Co—Fe—Cr—Si—Al—Ti powder; heating the Ni—Co—Fe—Cr—Si—Al—Ti powder with polyvinyl alcohol under stirring to obtain a mixed liquid, wherein the mixed liquid material includes 7-10% of the polyvinyl alcohol powder by weight; forming a bottom-layer powder having a size of 30-40 μm by vacuum atomization of the mixed liquid; and sintering the bottom-layer powder at a temperature in a vacuum-sintering furnace to obtain the metal mixture.

4. The method according to claim 3, wherein the sintering step is followed by grinding and screening the metal mixture to obtain a uniform particle size of 30-45 μm for the metal mixture.

5. The method according to claim 1, wherein a temperature for the heating is 80° C. and a time for the stirring is 12-15 hours.

6. The method according to claim 1, wherein the ceramic composite including SiO.sub.2 and La—Ce—Zr—O is prepared by: obtaining a lower-layer solution from reaction of a styrene liquid and a sodium hydroxide solution having 5-7 wt % of sodium hydroxide; adding the lower-layer solution into a trimethylammonium chloride solution, then adding an aqueous solution of azodiisobutylamine hydrochloride to the mixture of the lower-layer solution and the trimethylammonium chloride solution to obtain a styrene microsphere emulsion; adding tetraethyl orthosilicate into a mixture of the styrene microsphere emulsion, hexadecyl trimethyl ammonium bromide, and an ammonia solution to obtain a SiO2 solution; mixing 23-28 wt % La.sub.2O.sub.3 powder, 5-8 wt % CeO.sub.2 powder, and 64-72 wt % hydrochloric acid to form a La.sub.2Ce.sub.2O.sub.7 solution; gradually adding the ammonia solution into the mixture of the SiO.sub.2 solution, the La.sub.2Ce.sub.2O.sub.7 solution, and a zirconia octahydrate solution to form an emulsion of SiO.sub.2 and La—Ce—Zr—O having a pH of 3-6; and centrifuging, filtering, cleaning the emulsion of SiO.sub.2 and La—Ce—Zr—O and calcining at 530-580° C. to obtain the ceramic composite including SiO.sub.2 and La—Ce—Zr—O.

7. The method according to claim 6, further comprising grinding and screening the ceramic composite including SiO.sub.2 and La—Ce—Zr—O to obtain a uniform particle size of 30-40 μm for the ceramic composite including SiO.sub.2 and La—Ce—Zr—O.

8. A method according to claim 6, wherein the formation of the emulsion of SiO.sub.2 and La—Ce—Zr—O is performed in a condensing system under nitrogen protection gas.

Description

EXAMPLE 1

(1) A method for preparing a thermal barrier coating with self-repair and temperature-sensitive functions is provided, comprising the following steps:

(2) Step 1: A mixed-metal sintering material is prepared, an yttria-stabilized zirconia YSZ precursor sol is prepared, and SiO.sub.2 mixed La—Ce—Zr—O ceramic composites are prepared.

(3) Step 2: The mixed-metal sintering material is sprayed onto the surface using a supersonic flame spraying or explosive spraying process to form the bottom layer. Then, yttria-stabilized zirconia YSZ precursor sol is sprayed onto the surface of the bottom layer through a liquid plasma spraying process to form the intermediate layer. Finally, SiO.sub.2 is mixed with a La—Ce—Zr—O ceramic composite either through a plasma spraying process or explosive spraying process. The material is sprayed onto the surface of the intermediate layer to form a surface layer.

(4) In some embodiments, the mixed-metal sintering material in step 1 is powder, and the ceramic composite SiO.sub.2 material that is mixed with La—Ce—Zr—O is powder.

(5) The sintering preparation method for the mixed-metal material comprises the following steps:

(6) Step 1: Ni powder, Co powder, Fe powder, Cr powder, Si powder, Al powder and Ti powder with particle sizes of 0.5 μm are selected. The mass percentage ratio of Ni powder, Co powder, Fe powder, Cr powder, Si powder, Al powder and Ti powder is 82:6:1:2:0.1:2:6.9, and the powders are mixed evenly to obtain a Ni—Co—Fe—Cr—Si—Al—Ti mixed powder.

(7) Step 2: Polyvinyl alcohol powder is added to the to the mixed powder obtained in step 1. The mass ratio of polyvinyl alcohol powder in the mixed powder is 7-10%. Then, the mixed powder is heated and stirred to obtain a mixed liquid material.

(8) Step 3: The mixture obtained in step 2 is made into a bottom-layer powder by a vacuum atomization process, and the particle size of the bottom-layer powder is 30 μm.

(9) Step 4: The bottom-layer powder is sintered at high temperature in a vacuum-sintering furnace to induce sintering reactions between the metal elements in the bottom-layer powder to obtain a mixed-metal sintering material.

(10) In some embodiments, the mixed-metal sintering material is ground and screened to obtain a metal-sintering mixed powder with a uniform particle size (for example, 30 μm).

(11) In some embodiments, the mixed powder obtained in step 1 is ball milled and mixed in a liquid medium (alcohol) at a rotating speed of 7 RPM for 20 hours. Then, the mixed Ni—Co—Fe—Cr—Si—Al—Ti powder is obtained by an ultrasonic treatment at a frequency of 20 Hz for 0.5 hours and a drying treatment at 50° C. for 0.5 hours.

(12) In some embodiments, in the second step of the sintering preparation method for the mixed-metal material, the heating temperature is 30° C., the stirring time is 30 min, and the stirring rate is 300 RPM. A spray-mixed granulation liquid mixture procedure is carried out in vacuum, and a Ni—Co—Fe—Cr—Si—Al—Ti composite spraying material with a particle size of 30 μm is obtained.

(13) In some embodiments, in step 4 of the sintering preparation method for the above mixed-metal material, the sintering treatment causes a solid solution reaction of Ni, Al, Fe, Cr and Co.

(14) In some embodiments, for the vacuum-sintering process in step 4 of the above method for preparing the mixed-metal material, the vacuum pressure is 1×10.sup.−3 Pa, the heating temperature is 810° C., the heating rate is 10° C./min, and the protective gas is hydrogen.

(15) The preparation method for yttria-stabilized zirconia YSZ precursor sol comprises the following steps:

(16) Step 1: Er.sub.2O.sub.3 and hydrochloric acid (volume concentration 98%) are evenly mixed to obtain the first mixed solution, in which the mass ratio of Er.sub.2O.sub.3 and hydrochloric acid is 33:67.

(17) Step 2: The mass percentage ratio of ZrOCl.sub.2.Math.8H.sub.2O octahydrate, Y.sub.2O.sub.3 and deionized water is 28:1:71, and the second mixed solution is obtained upon mixing these components.

(18) Step 3: Ammonia water with pH=10 is prepared and gradually dropped into both the first mixed solution and the second mixed solution as the reaction bottom solution. During mixing, the first mixed solution and the second mixed solution are heated to obtain an Er.sup.3+ yttria-stabilized zirconia YSZ precursor solution at pH=3.

(19) In some embodiments, in step 1 of the preparation method for the yttria-stabilized zirconia YSZ precursor sol, 2 g of polyethylene glycol dispersant is added, the stirring is uniform at a rate of 400 RPM, and the stirring time is 30 min.

(20) In some embodiments, in step 2 of the preparation method for the yttria-stabilized zirconia YSZ precursor sol, the mixing time is 60 min, the stirring speed is 500 RPM, and 30 g of polyethylene glycol dispersant is added.

(21) In some embodiments, the heating temperature of step 3 of the preparation method for the yttria-stabilized zirconia YSZ precursor sol is 80° C., and the uniform stirring time is 12 hours.

(22) The method for preparing the SiO.sub.2 mixed La.sub.2Zr.sub.2O.sub.7 ceramic composite comprises the following steps:

(23) Step 1: Styrene liquid and 5% sodium hydroxide solution are evenly stirred together to obtain the lower solution after sufficient reaction and static stratification. The lower solution is gradually added into the trimethylammonium chloride solution to obtain the mixed trimethylammonium chloride and styrene solution. Then, an aqueous solution of azodiisobutylamine hydrochloride is added into the mixed trimethylammonium chloride and styrene solution. The styrene microsphere emulsion is obtained by polymerization. The styrene microsphere emulsion, hexadecyl trimethyl ammonium bromide powder and ammonia water are mixed evenly, tetraethyl orthosilicate is gradually added to induce a reaction, and a mixed solution containing SiO.sub.2 is obtained.

(24) La.sub.2O.sub.3 powder, CeO.sub.2 powder and hydrochloric acid are mixed at a mass ratio of 23:5:72, and a La.sub.2Ce.sub.2O.sub.7 mixed solution is obtained after a homogeneous and sufficient reaction.

(25) Zirconia octahydrate is mixed with deionized water to obtain an aqueous zirconia solution. Step 2: The SiO.sub.2 mixture, La.sub.2Ce.sub.2O.sub.7 mixed solution and zirconia aqueous solution are mixed evenly, ammonia water is gradually added, and the mixture fully reacts to produce the mixed emulsion of pH=3 SiO.sub.2 and La—Ce—Zr—O.

(26) Step 3: Centrifugal sedimentation of the mixed emulsion is carried out, and the precipitates are obtained, filtered, cleaned and dried. At a calcination temperature of 530° C., the ceramic composite is obtained by calcining the dried settlement.

(27) In some embodiments, the ceramic composite material is ground and screened to obtain ceramic composite powder with a uniform particle size (for example, 30 μm) of SiO.sub.2 mixed with La—Ce—Zr—O.

(28) In some embodiments, in step 1 of the above method for preparing the SiO.sub.2 mixed La.sub.2Zr.sub.2O.sub.7 ceramic composite, styrene liquid and 5% sodium hydroxide solution are stirred evenly, and isoprene is formed in the reaction.

(29) In some embodiments, in step 1 of the preparation method for the SiO.sub.2 mixed La.sub.2Zr.sub.2O.sub.7 ceramic composite, the gradual addition decreases.

(30) In some embodiments, in step 1 of the preparation method for the abovementioned SiO.sub.2 mixed La.sub.2Zr.sub.2O.sub.7 ceramic composite material, the aqueous solution of the azo two isobutyl amiate hydrochloride is added into the mixed trimethylamine chloride and styrene solution to induce a polymerization and obtain a styrene microsphere emulsion.

(31) In some embodiments, the ceramic composite material is used to form a surface layer, and the surface layer has a self-repairing function.

(32) In some embodiments, the preparation steps for the above SiO.sub.2 mixed La.sub.2Zr.sub.2O.sub.7 ceramic composites are as follows: the aqueous solution of azo two isobutyl amiate hydrochloride is added into the mixed trimethylamine chloride and styrene solution to polymerize the styrene microsphere emulsion, the condensing system is obtained in the polymerization process, and nitrogen gas is used as a protective gas.

EXAMPLE 2

(33) One or more embodiments of the present disclosure are described as follows:

(34) Step 1: Mixed metal sintering materials are prepared, an yttria-stabilized zirconia YSZ precursor sol is prepared, and SiO.sub.2 mixed La—Ce—Zr—O ceramic composites are prepared.

(35) Step 2: The metal sintering mixture is sprayed onto the surface using a supersonic flame spraying or explosive spraying process to form the bottom layer. Then, yttria-stabilized zirconia YSZ precursor sol is sprayed onto the surface of the bottom layer through a liquid plasma spraying process to form the intermediate layer. Finally, SiO.sub.2 is mixed with a La—Ce—Zr—O ceramic composite either through a plasma spraying process or explosive spraying process. The material is sprayed onto the surface of the intermediate layer to form a surface layer.

(36) Furthermore, the mixed-metal sintering material in step 1 is powder, and the ceramic composite SiO.sub.2 material that is mixed with La—Ce—Zr—O is powder.

(37) The sintering preparation method for the mixed-metal material comprises the following steps:

(38) Step 1: Ni powder, Co powder, Fe powder, Cr powder, Si powder, Al powder and Ti powder with particle sizes of 0.7 μm are selected. The mass percentage ratio of Ni powder, Co powder, Fe powder, Cr powder, Si powder, Al powder and Ti powder is 83:6:1:2:0.3:2:5.7, and the powders are evenly mixed to obtain a Ni—Co—Fe—Cr—Si—Al—Ti mixed powder.

(39) Step 2: Polyvinyl alcohol powder is added to the to the mixed powder obtained in step 1. The mass ratio of polyvinyl alcohol powder in the mixed powder is 8%, and then the mixed powder is heated and stirred to obtain a mixed liquid material.

(40) Step 3: The mixture obtained in step 2 is made into a bottom-layer powder by a vacuum atomization process, and the particle size of the bottom-layer powder is 35 μm.

(41) Step 4: The bottom-layer powder is sintered at high temperature in a vacuum-sintering furnace to induce sintering reactions between the metal elements in the bottom-layer powder and obtain a mixed-metal sintering material.

(42) In some embodiments, the mixed-metal sintering material is ground and screened to obtain a metal-sintering mixed powder with a uniform particle size (for example, 40 μm).

(43) In some embodiments, the mixed powder obtained in step 1 is ball milled and mixed in a liquid medium (alcohol) at 8 RPM for 23 hours. Then, the mixed Ni—Co—Fe—Cr—Si—Al—Ti powder is obtained by an ultrasonic treatment at 23 Hz for 0.8 hours and a drying treatment at 50° C. for 0.5 hours.

(44) In some embodiments, in the second step of the sintering preparation method for the mixed-metal material, the heating temperature is 50° C., the stirring time is 50 min, and the stirring rate is 400 RPM. A spray-mixed granulation liquid mixture procedure is carried out in vacuum, and a Ni—Co—Fe—Cr—Si—Al—Ti composite spraying material with a particle size of 35 μm is obtained.

(45) In some embodiments, in step 4 of the sintering preparation method for the above mixed-metal material, the sintering treatment causes a solid solution reaction of Ni, Al, Fe, Cr and Co.

(46) In some embodiments, for the vacuum-sintering process in step 4 of the above method for preparing the mixed-metal material, the vacuum pressure is 1×10.sup.−3 Pa, the heating temperature is 820° C., the heating rate is 13° C./min, and the protective gas is hydrogen.

(47) The preparation method for yttria-stabilized zirconia YSZ precursor sol comprises the following steps:

(48) Step 1: Er2O3 and hydrochloric acid (volume concentration 98%) are evenly mixed to obtain the first mixed solution, in which the mass ratio of Er2O3 and hydrochloric acid is 35:65.

(49) Step 2: ZrOCl2.Math.8H2O octahydrate, Y2O3 and deionized water are evenly mixed at a mass percentage ratio of 29:1:70 to obtain the second mixed solution.

(50) Step 3: Ammonia water with pH=10 is prepared and gradually dropped into both the first mixed solution and the second mixed solution as the reaction bottom solution. During mixing, the first mixed solution and the second mixed solution are heated at the same time to obtain an Er.sup.3+ yttria-stabilized zirconia YSZ precursor sol with pH=3˜6.

(51) In some embodiments, in step 1 of the above preparation method for yttria-stabilized zirconia YSZ precursor sol, 4 g of polyethylene glycol dispersant is added, the stirring is uniform at a rate of 400 RPM, and the stirring time is 40 min.

(52) In some embodiments, in step 2 of the preparation method for the yttria-stabilized zirconia YSZ precursor sol, the mixing time is 80 min, the stirring speed is 500 RPM, and 40 g of polyethylene glycol dispersant is added.

(53) In some embodiments, the heating temperature in step 3 of the preparation method for the yttria-stabilized zirconia YSZ precursor sol is 80° C., and the uniform stirring time is 14 hours.

(54) The method for preparing the SiO.sub.2 mixed La.sub.2Zr.sub.2O.sub.7 ceramic composite comprises the following steps:

(55) Step 1: Styrene liquid and 6% sodium hydroxide solution are evenly stirred together to obtain the lower solution after sufficient reaction and static stratification. The lower solution is gradually added into the trimethylammonium chloride solution to obtain the mixed trimethylammonium chloride and styrene solution. Then, an aqueous solution of azodiisobutylamine hydrochloride is added into the mixed trimethylammonium chloride and styrene solution. The styrene microsphere emulsion is obtained by polymerization. The styrene microsphere emulsion, hexadecyl trimethyl ammonium bromide powder and ammonia water are mixed evenly, tetraethyl orthosilicate is gradually added to induce a reaction, and a mixed solution containing SiO.sub.2 is obtained.

(56) La.sub.2O.sub.3 powder, CeO.sub.2 powder and hydrochloric acid are mixed at a mass ratio of 26:7:67, and a La.sub.2Ce.sub.2O.sub.7 mixed solution is obtained after a homogeneous and sufficient reaction.

(57) Zirconia octahydrate is mixed with deionized water to obtain an aqueous zirconia solution.

(58) Step 2: The SiO.sub.2 mixture, La.sub.2Ce.sub.2O.sub.7 mixed solution and zirconia aqueous solution are mixed evenly, ammonia water is gradually added, and the mixture fully reacts to produce the mixed emulsion of pH=5 SiO.sub.2 and La—Ce—Zr—O.

(59) Step 3: Centrifugal sedimentation of the mixed emulsion is carried out, and the precipitates are obtained, filtered, cleaned and dried. At a calcination temperature of 550° C., the ceramic composite is obtained by calcining the dried settlement.

(60) In some embodiments, the ceramic composite material is ground and screened to obtain a ceramic composite powder with a uniform particle size (for example, 35 μm) of SiO.sub.2 mixed with La—Ce—Zr—O.

(61) In some embodiments, in step 1 of the above preparation method for the SiO.sub.2 mixed La.sub.2Zr.sub.2O.sub.7 ceramic composite, styrene liquid and 6% sodium hydroxide solution are stirred evenly, and isoprene is formed in the reaction.

(62) In some embodiments, in step 1 of the preparation method for the SiO.sub.2 mixed La.sub.2Zr.sub.2O.sub.7 ceramic composite, the gradual addition decreases.

(63) In some embodiments, in step 1 of the preparation method for the abovementioned SiO.sub.2 mixed La.sub.2Zr.sub.2O.sub.7 ceramic composite material, the aqueous solution of the azo two isobutyl amiate hydrochloride is added into the mixed trimethylamine chloride and styrene solution to induce a polymerization and obtain a styrene microsphere emulsion.

(64) In some embodiments, the ceramic composite material is used to form a surface layer, and the surface layer has a self-repairing function.

(65) In some embodiments, the preparation steps of the above SiO.sub.2 mixed La.sub.2Zr.sub.2O.sub.7 ceramic composites are as follows: the aqueous solution of azo two isobutyl amiate hydrochloride is added into the mixed trimethylamine chloride and styrene solution to polymerize the styrene microsphere emulsion, the condensing system is obtained in the polymerization process, and nitrogen gas is used as a protective gas.

EXAMPLE 3

(66) One or more embodiments of the present disclosure are described as follows:

(67) Step 1: Mixed-metal sintering materials are prepared, an yttria-stabilized zirconia YSZ precursor sol is prepared, and SiO.sub.2 mixed La—Ce—Zr—O ceramic composites are prepared.

(68) Step 2: The metal sintering mixture is sprayed onto the surface using a supersonic flame spraying or explosive spraying process to form the bottom layer. Then, yttria-stabilized zirconia YSZ precursor sol is sprayed onto the surface of the bottom layer through a liquid plasma spraying process to form the intermediate layer. Finally, SiO.sub.2 is mixed with a La—Ce—Zr—O ceramic composite either through a plasma spraying process or explosive spraying process. The material is sprayed onto the surface of the intermediate layer to form a surface layer.

(69) In some embodiments, the mixed-metal sintering material in step 1 is powder, and the ceramic composite SiO.sub.2 material that is mixed with La—Ce—Zr—O is powder.

(70) The sintering preparation method for the mixed-metal material comprises the following steps:

(71) Step 1: Ni powder, Co powder, Fe powder, Cr powder, Si powder, Al powder and Ti powder with particle sizes of 1 μm are selected. The mass percentage ratio of Ni powder, Co powder, Fe powder, Cr powder, Si powder, Al powder and Ti powder is 84:7:2:3:0.5:3:0.5, and the powders are mixed evenly to obtain a Ni—Co—Fe—Cr—Si—Al—Ti mixed powder.

(72) Step 2: Polyvinyl alcohol powder is added to the to the mixed powder obtained in step 1. The mass ratio of polyvinyl alcohol powder in the mixed powder is 7-10%. Then, the mixed powder is heated and stirred to obtain the mixed liquid material.

(73) Step 3: The mixture obtained in step 2 is made into a bottom-layer powder by a vacuum atomization process, and the particle size of the bottom-layer powder is 40 μm.

(74) Step 4: The bottom-layer powder is sintered at high temperature in a vacuum-sintering furnace to induce sintering reactions between the metal elements in the bottom-layer powder and obtain a mixed-metal sintering material.

(75) In some embodiments, the mixed-metal sintering material is ground and screened to obtain a uniform (e.g., 45 μm) metal sintering mixed powder.

(76) In some embodiments, the mixed powder obtained in step 1 is ball milled and mixed in a liquid medium (alcohol) at a rotating speed of 10 RPM for 25 hours. Then, the mixed Ni—Co—Fe—Cr—Si—Al—Ti powder is obtained by an ultrasonic treatment at a frequency of 25 Hz for 1 hour and a drying treatment at 60° C. for 1 hour.

(77) In some embodiments, in the second step of the sintering preparation method for the mixed-metal material, the heating temperature is 60° C., the stirring time is 60 min, and the stirring rate is 500 RPM. A spray-mixed granulation liquid mixture procedure is carried out in vacuum, and a Ni—Co—Fe—Cr—Si—Al—Ti composite spraying material with a particle size of 40 μm is obtained.

(78) In some embodiments, in step 4 of the sintering preparation method for the above mixed-metal material, the sintering treatment causes a solid solution reaction of Ni, Al, Fe, Cr and Co.

(79) In some embodiments, for the vacuum-sintering process in step 4 of the above sintering preparation method for mixed-metal materials, the vacuum pressure is 1×10.sup.−3 Pa, the heating temperature is 830° C., the heating rate is 15° C./min, and the protective gas is hydrogen.

(80) The preparation method for yttria-stabilized zirconia YSZ precursor sol comprises the following steps:

(81) Step 1: Er.sub.2O.sub.3 and hydrochloric acid (volume concentration 98%) are evenly mixed to obtain the first mixed solution, in which the mass ratio of Er.sub.2O.sub.3 and hydrochloric acid is 37:67.

(82) Step 2: Zirconia octahydrate ZrOCl.sub.2.Math.8H.sub.2O, yttrium oxide Y.sub.2O.sub.3 and deionized water are evenly mixed at a mass percentage ratio of 30:1:69 to obtain the second mixed solution.

(83) Step 3: Ammonia water with pH=10 is prepared and gradually dropped into both the first mixed solution and the second mixed solution as the reaction bottom solution. During mixing, the first mixed solution and the second mixed solution are heated at the same time to obtain an Er3+yttria-stabilized zirconia YSZ precursor solution with pH=6.

(84) In some embodiments, in step 1 of the above preparation method for yttria-stabilized zirconia YSZ precursor sol, 5 g of polyethylene glycol dispersant is added and stirred evenly at 400 RPM for 50 min.

(85) In some embodiments, in step 2 of the preparation method for the yttria-stabilized zirconia YSZ precursor sol, the mixing time is 90 min, the stirring speed is 500 RPM, and 50 g of polyethylene glycol dispersant is added.

(86) In some embodiments, the heating temperature of step 3 of the preparation method for the yttria-stabilized zirconia YSZ precursor sol is 80° C., and the uniform stirring time is 15 hours.

(87) The method for preparing the SiO2 mixed La2Zr2O7 ceramic composite comprises the following steps:

(88) Step 1: Styrene liquid and 7% sodium hydroxide solution are evenly stirred together to obtain the lower solution after sufficient reaction and static stratification. The lower solution is gradually added into the trimethylammonium chloride solution to obtain the mixed trimethylammonium chloride and styrene solution. Then, an aqueous solution of azodiisobutylamine hydrochloride is added into the mixed trimethylammonium chloride and styrene solution. The styrene microsphere emulsion is obtained by polymerization. The styrene microsphere emulsion, hexadecyl trimethyl ammonium bromide powder and ammonia water are mixed evenly, tetraethyl orthosilicate is gradually added to induce a reaction, and a mixed solution containing SiO2 is obtained.

(89) La.sub.2O.sub.3 powder, CeO.sub.2 powder and hydrochloric acid are mixed at a mass ratio of 28:8:64, and a La.sub.2Ce.sub.2O.sub.7 mixed solution is obtained after a homogeneous and sufficient reaction.

(90) Zirconia octahydrate is mixed with deionized water to obtain an aqueous zirconia solution.

(91) Step 2: The SiO.sub.2 mixture, La.sub.2Ce.sub.2O.sub.7 mixed solution and zirconia aqueous solution are mixed evenly, ammonia water is gradually added, and the mixture fully reacts to produce the mixed emulsion of pH=6 SiO.sub.2 and La—Ce—Zr—O.

(92) Step 3: Centrifugal sedimentation of the mixed emulsion is carried out, and the precipitates are obtained, filtered, cleaned and dried. At a calcination temperature of 580° C., the ceramic composite is obtained by calcining the dried settlement.

(93) In some embodiments, the ceramic composite material is ground and screened to obtain a ceramic composite powder with a uniform particle size (for example, 40 μm) of SiO.sub.2 mixed with La—Ce—Zr—O.

(94) In some embodiments, in step 1 of the above preparation method for the SiO.sub.2 mixed La.sub.2Zr.sub.2O.sub.7 ceramic composite, styrene liquid and 7% sodium hydroxide solution are stirred evenly, and isoprene is formed in the reaction.

(95) In some embodiments, in step 1 of the preparation method for the SiO.sub.2 mixed La.sub.2Zr.sub.2O.sub.7 ceramic composite, the gradual addition decreases.

(96) In some embodiments, in step 1 of the preparation method for the abovementioned SiO.sub.2 mixed La.sub.2Zr.sub.2O.sub.7 ceramic composite material, the aqueous solution of the azo two isobutyl amiate hydrochloride is added into the mixed trimethylamine chloride and styrene solution to induce a polymerization and obtain a styrene microsphere emulsion.

(97) In some embodiments, the ceramic composite material is used to form a surface layer, and the surface layer has a self-repairing function.

(98) In some embodiments, the preparation steps for the above SiO.sub.2 mixed La.sub.2Zr.sub.2O.sub.7 ceramic composites are as follows: the aqueous solution of azo two isobutyl amiate hydrochloride is added into the mixed trimethylamine chloride and styrene solution to polymerize the styrene microsphere emulsion, the condensing system is obtained in the polymerization process, and nitrogen gas is used as a protective gas.

(99) It should be understood that for those skilled in the art, improvements or transformations can be made according to the above description, and all these improvements and transformations shall fall within the protection scope of the appended claims of the invention.

(100) The ranges of this disclosure may be expressed in the disclosure as from about one particular value, to about another particular value, or both. When such a range is expressed, it is to be understood that another embodiment is from the one particular value, to the other particular value, or both, along with all combinations within this range.

(101) Although the disclosure has been described with respect to only a limited number of embodiments, those skilled in the art, having benefit of this disclosure, will appreciate that various other embodiments may be devised without departing from the scope of the present invention. Accordingly, the scope of the invention should be limited only by the attached claims.