DOUBLE-TUBE CONNECTION STRUCTURE FOR DETONATION SYNTHESIS, DETONATION SYNTHESIS DEVICE AND APPLICATION THEREOF

Abstract

A double-tube connection structure for detonation synthesis, a detonation synthesis device and an application thereof are provided. The double-tube connection structure for detonation synthesis includes a drive tube, a sample tube, fixing components, and end plugs provided at ports of the sample tube. The drive tube is sleeved outside the sample tube, cavities are provided between the drive tube and the sample tube, and between the drive tube and the end plug. The fixing components are provided on two ends of the drive tube and the sample tube. After detonation, a detonation wave is transferred from top to bottom. Under the action of the detonation wave, the drive tube performs convergent sliding motion towards the sample tube, and covers outsides of the sample tube, and the top end plug and the bottom end plug of the sample tube. A detonation synthesis device includes the double-tube connection structure for detonation synthesis.

Claims

1. A double-tube connection structure for detonation synthesis, comprising a drive tube, a sample tube, fixing components, and end plugs provided at two ends of the sample tube, wherein the drive tube is sleeved outside the sample tube and a cavity exists both between the drive tube and the sample tube and between the drive tube and the end plugs, and the fixing components are provided at two ends of the drive tube and the sample tube and are configured to fix the drive tube and the sample tube, wherein after detonation at a top portion, a detonation wave is transferred from top to bottom, and under an action of the detonation wave, the drive tube performs convergent sliding motion towards an axis of the sample tube from top to bottom, the fixing components are separated from the drive tube and the sample tube and fly outwards under an action of a tensioning wave, and the drive tube is sequentially wrapped from top to bottom around a top end plug of the sample tube, the sample tube, and a bottom end plug of the sample tube, to form a composite tube with two ends closed, becoming a complete recovery container.

2. The double-tube connection structure for detonation synthesis according to claim 1, wherein an annular gap between an inner wall of the drive tube and an outer wall of the sample tube serves as a cavity.

3. The double-tube connection structure for detonation synthesis according to claim 1, wherein an outer diameter of a part of each of the end plugs for being in wrapping contact with the drive tube is smaller than an outer diameter of the sample tube.

4. The double-tube connection structure for detonation synthesis according to claim 3, wherein the end plug is in a tapered structure, and a large diameter end of the tapered structure is connected to the sample tube.

5. The double-tube connection structure for detonation synthesis according to claim 1, wherein the fixing component provided at a top portion of the drive tube comprises a fixing ring and at least one layer of cover plate; the fixing ring has one end connected to the top portion of the drive tube and the other end connected to the cover plate, the cover plate is configured to seal the cavity; and the fixing component provided at a bottom portion of the drive tube comprises a fixing ring and a base, and the fixing ring has one end connected to the bottom portion of the drive tube and the other end connected to the base, and the base plays a fixing and supporting role.

6. The double-tube connection structure for detonation synthesis according to claim 5, wherein the top portion and/or bottom portion of the drive tube and an end portion of the fixing ring are spliced with each other to form a coaxial barrel structure.

7. The double-tube connection structure for detonation synthesis according to claim 6, wherein an end surface of the bottom portion and/or an end surface of the top portion of the drive tube is provided with a limiting ring I extending outwards in an axial direction, an end surface of the corresponding fixing ring is provided with a limiting ring II extending outwards in an axial direction, and connection between the drive tube and the fixing ring is realized through the limiting ring I and the limiting ring II with one sleeved over the other.

8. The double-tube connection structure for detonation synthesis according to claim 5, wherein the fixing component further comprises a fixing block, the fixing block is provided inside the fixing ring, and the fixing block has one end connected to the end plug and the other end connected to the cover plate or the base.

9. A detonation synthesis device, comprising a housing and the double-tube connection structure for detonation synthesis according to claim 1 provided in the housing, wherein a chamber between an inner wall of the housing and an outer wall of the drive tube is filled with a main explosive, bottom ends of the drive tube and the sample tube are mounted on a tray through the fixing component and the tray is configured to seal a bottom end of the housing, and a top end of the housing is provided with a detonation component.

10. The detonation synthesis device according to claim 9, wherein the detonation component comprises a primer, a detonator fixing plate, and a detonator, the primer is laid flat on a top layer of the main explosive, the primer is provided thereon with the detonator fixing plate, and the detonator fixing plate is fixed thereon with the detonator.

11. A method for using the detonation synthesis device according to claim 9, comprising using the detonation synthesis device to convert low pressure phase materials into high pressure phase materials or to pulverize hard materials, wherein the high pressure phase materials comprise diamonds, carbides, nitrides and borides, wherein the double-tube connection structure for detonation synthesis is configured to convert low pressure phase materials into high pressure phase materials or to pulverize hard materials, wherein the high pressure phase materials comprise diamonds, carbides, nitrides and borides.

12. A preparation method of a high strength composite tube and/or a high strength pressure vessel, wherein the high strength composite tube and/or the high strength pressure vessel is made after detonation of a double-tube connection structure for detonation synthesis according to claim 1 or a detonation synthesis device, wherein the detonation synthesis device comprises a housing and the double-tube connection structure for detonation synthesis provided in the housing, wherein a chamber between an inner wall of the housing and an outer wall of the drive tube is filled with a main explosive, bottom ends of the drive tube and the sample tube are mounted on a tray through the fixing component and the tray is configured to seal a bottom end of the housing, and a top end of the housing is provided with a detonation component.

13. The double-tube connection structure for detonation synthesis according to claim 2, wherein an outer diameter of a part of each of the end plugs for being in wrapping contact with the drive tube is smaller than an outer diameter of the sample tube.

14. The double-tube connection structure for detonation synthesis according to claim 6, wherein the fixing component further comprises a fixing block, the fixing block is provided inside the fixing ring, and the fixing block has one end connected to the end plug and the other end connected to the cover plate or the base.

15. The double-tube connection structure for detonation synthesis according to claim 7, wherein the fixing component further comprises a fixing block, the fixing block is provided inside the fixing ring, and the fixing block has one end connected to the end plug and the other end connected to the cover plate or the base.

16. The detonation synthesis device according to claim 9, wherein an annular gap between an inner wall of the drive tube and an outer wall of the sample tube serves as a cavity.

17. The detonation synthesis device according to claim 9, wherein an outer diameter of a part of each of the end plugs for being in wrapping contact with the drive tube is smaller than an outer diameter of the sample tube.

18. The detonation synthesis device according to claim 17, wherein the end plug is in a tapered structure, and a large diameter end of the tapered structure is connected to the sample tube.

19. The detonation synthesis device according to claim 9, wherein the fixing component provided at a top portion of the drive tube comprises a fixing ring and at least one layer of cover plate; the fixing ring has one end connected to the top portion of the drive tube and the other end connected to the cover plate, the cover plate is configured to seal the cavity; and the fixing component provided at a bottom portion of the drive tube comprises a fixing ring and a base, and the fixing ring has one end connected to the bottom portion of the drive tube and the other end connected to the base, and the base plays a fixing and supporting role.

20. The detonation synthesis device according to claim 19, wherein the top portion and/or bottom portion of the drive tube and an end portion of the fixing ring are spliced with each other to form a coaxial barrel structure.

Description

BRIEF DESCRIPTION OF DRAWINGS

[0048] Accompanying drawings described herein, constituting a portion of the present disclosure, are used to provide further understanding to the embodiments of the present disclosure, and do not limit the embodiments of the present disclosure. In the accompanying drawings:

[0049] FIG. 1 is a pressure-temperature phase diagram of carbon;

[0050] In FIG. 1, solid line: graphite-diamond phase equilibrium line; dot dash line: diamond melting line; dotted line: graphite melting line; and

[0051] FIG. 2 is a structural schematic diagram of a detonation synthesis device of the present disclosure.

REFERENCE SIGNS IN THE ABOVE ACCOMPANYING DRAWINGS AND NAMES OF CORRESPONDING PARTS

[0052] 1—sample, 2—sample tube, 3—cavity, 4—drive tube, 5—main explosive, 6—primer, 7—end plug, 8—fixing block, 9—fixing ring, 10—cover plate, 11—base, 12—wooden tray, 13—housing, 14—detonator positioning plate, 15—detonator.

DETAILED DESCRIPTION OF EMBODIMENTS

[0053] In order to make objectives, technical solutions, and advantages of the present disclosure clearer, the present disclosure is further described in detail below in combination with embodiments and accompanying drawings. The exemplary embodiments of the present disclosure and description thereof are merely used to explain the present disclosure, rather than limiting the present disclosure.

Embodiment 1

[0054] The present embodiment provides a double-tube connection structure for detonation synthesis, including a drive tube 4 and a sample tube 2, wherein the drive tube 4 and the sample tube 2 are both of circular tube structure, the drive tube 4 is coaxially sleeved outside the sample tube 2, and an annular gap (circumferential gap) between an inner wall of the drive tube 4 and an outer wall of the sample tube 2 serves as a cavity 3; a top port and a bottom port of the sample tube 2 are each provided with a sealing end plug 7, and the top port and the bottom port of the sample tube 2 are both located in the drive tube 4. Fixing components are further included, and a top portion port and a bottom portion port of the drive tube 4 are each covered by the fixing component, then a main explosive can be prevented from entering the cavity 3; after detonation, a detonation wave is transferred from top to bottom, and under the action of impact, the drive tube 4 performs convergent sliding motion towards an axis of the sample tube 2 from top to bottom, so that the drive tube 4 is sequentially wrapped from top to bottom around the top end plug 7 of the sample tube 2, the sample tube 2, and a bottom end plug 7 of the sample tube 2, forming a composite tube, where the composite tube is a complete recovery container.

Embodiment 2

[0055] On the basis of Embodiment 1, it is further improved that an outer diameter of a part of the end plug 7 for being in wrapping contact with the drive tube 4 is smaller than an outer diameter of the sample tube 2; further preferably, the end plug 7 is of a circular truncated cone structure, a large diameter end of the circular truncated cone structure is inserted into a port of the sample tube 2, and a small diameter end of the circular truncated cone structure is connected to the fixing component.

Embodiment 3

[0056] On the basis of Embodiment 1 or 2, it is further improved that for the fixing component, after detonation, when the detonation wave is transferred to a joint between an end portion of the drive tube 4 and the fixing component, the joint between the end portion of the drive tube 4 and the fixing component is disconnected (the end portion of the drive tube 4 is disconnected with and separated from the fixing component), then the fixing component flies outwards under the action of tensioning wave; the end portion of the drive tube 4, after performing convergent motion towards the axis of the sample tube 2, is wrapped around the end plug 7. As a preferable solution, the fixing component mounted at the top portion of the drive tube 4 includes a fixing ring 9 and two layers of cover plates 10; the fixing ring 9 has one end connected to the top portion of the drive tube 4, and the other end connected to the cover plates 10; the cover plates 10 are configured to seal the cavity 3, an annular groove is provided on a lower plate surface of the cover plate 10, and an end portion of the fixing ring 9 can be embedded into the annular groove and fixed. The fixing component mounted at the bottom portion of the drive tube 4 includes a fixing ring 9 and a base 11, and the fixing ring 9 has one end connected to the bottom portion of the drive tube 4, and the other end connected to the base 11; and the base 11 plays a supporting role.

[0057] The structure for realizing the connection between the drive tube 4 and the fixing ring 9 is as follows: the end portion of the drive tube 4 and the end portion of the fixing ring 9 are spliced with each other to form a coaxial barrel structure. Specifically, the connection structure between the top portion of the drive tube 4 and the fixing component is as follows: an inner side of an end surface of the drive tube 4 extends outwards in an axial direction and is provided with a limiting inner ring, an outer side of an end surface of the fixing ring 9 extends outwards in the axial direction and is provided with a limiting outer ring, the limiting outer ring is sleeved outside the limiting inner ring, an end surface of the limiting inner ring abuts against the end surface of the fixing ring 9, and the end surface of the limiting outer ring abuts against the end surface of the drive tube 4. The connection structure between the bottom portion of the drive tube 4 and the fixing component is as follows: an outer side of the end surface of the drive tube 4 extends outwards in the axial direction and is provided with a limiting outer ring, an inner side of an end surface of the fixing ring 9 extends outwards in the axial direction and is provided with a limiting inner ring, the limiting outer ring is sleeved outside the limiting inner ring, an end surface of the limiting inner ring abuts against the end surface of the drive tube 4, and the end surface of the limiting outer ring abuts against the end surface of the fixing ring 9.

[0058] A further preferred solution further includes a fixing block 8, wherein the fixing block 8 is located inside the fixing ring 9, and the fixing block 8 has one end connected to the end plug 7, and the other end connected to the cover plate 10, as shown in FIG. 2; and the fixing block 8 and the fixing ring 9 are both made of a metal material.

Embodiment 4

[0059] The present embodiment provides a detonation synthesis device, including a housing 13, the double-tube connection structure for detonation synthesis provided in Embodiment 3 mounted in the housing 13, wherein a chamber between an inner wall of the housing 13 and an outer wall of the drive tube 4 is filled with a main explosive. The fixing component provided at the top portions of the sample tube 2 and the drive tube 4 is composed of the fixing ring 9, the fixing block 8, and the cover plate 10, the fixing component provided at the bottom portions of the sample tube 2 and the drive tube 4 is composed of the fixing ring 9, the fixing block 8, and the base 11, and the base 11 is configured to fix the sample tube 2 and the drive tube 4, as well as the fixing block 8 and the fixing ring 9. The bottom portions of the drive tube 4 and the sample tube 2 are mounted on a wooden tray 12 through the fixing component, the wooden tray 12 is configured to seal a bottom end of the housing 13; and a top end of the housing 13 is provided with a detonation component.

Embodiment 5

[0060] On the basis of Embodiment 4, it is further improved that the detonation component includes a primer 6, a detonator fixing plate 14, and a detonator 15, wherein the primer 6 is laid flat on a top layer of the main explosive 5, the primer layer has a bottom surface in contact with the top portion of the fixing component, and a top surface in contact with a lower plate surface of the detonator fixing plate 14; and the detonator fixing plate 14 is provided thereon with the detonator 15. The explosive is an energy source of the synthesis device. The amount of explosive of the device used in the present embodiment is 260 KG. The main explosive is placed in a gap between the housing 13 and the drive tube 4; a layer of RDX high power primer with a thickness of 1 cm-3 cm is laid on an entire top plane; and then the detonator 15 is inserted into the detonator positioning plate 14.

[0061] Polycrystalline diamond is synthesized using the device provided in Embodiment 5, and the synthesis principle is analyzed as follows.

[0062] 1. A Certain High-Temperature High-Pressure Condition can be Created, so that Graphite is Converted into Diamond, and a High Conversion Rate is Obtained.

[0063] The present embodiment substantially provides a cylindrical surface sliding detonation double-tube impact synthesis device. After the explosive is detonated at the top end of the device, a detonation wave is formed in the explosive, the detonation wave propagates from top to bottom along the outer wall of the drive tube at a steady speed, and a high-pressure detonation product behind a detonation wave front pushes the drive tube to perform convergent motion towards the axis of the device. During cavity flight, on an explosive-drive tube interface, due to the interaction between the compressional wave and rarefaction wave, the drive tube will continuously obtain energy from the explosive to continuously accelerate. Due to the convergent effect, the more the drive tube converges towards the axis, the higher its free-surface velocity will be. After the drive tube and the sample tube collide with each other at a high speed, a shock wave forms a stable detonation impact system in the sample tube, and traverses the whole sample from top to bottom, so that the sample is uniformly compressed. Thus, the conversion rate of the present disclosure is quite high, reaching 90% or more.

[0064] 2. Graphitization can be Prevented.

[0065] An impact compression process is accompanied by an unloading process of pressure. In the unloading process, in order to reduce the reverse phase change from diamond to graphite as much as possible, doping a metal powder (such as copper powder) with good thermal conductivity into the sample can achieve the effect of impact quenching, and this requirement can be met by selecting an appropriate mixing ratio of graphite to metal powder.

[0066] 3. High Recovery Rate.

[0067] As the collision pressure between the drive tube and the sample tube is far higher than the Hugoniot elastic limit of the material of the drive tube itself, the material enters a plastic zone, and through the convergent effect and plastic deformation, the drive tube is tightly wrapped around the sample tube and sealing plugs at two ends, and the drive tube, the sample tube, and the sealing plugs at two ends constitute a composite tube with very high strength through the detonation action, becoming a recovery container for the diamond generated. Besides, at the end portion of the device, when the high-pressure detonation product expands in a divergent manner into the air, the tensioning wave will be generated, and when the tensioning wave is at the end portion of the sample tube and has sufficient strength, an orifice of the sample tube may be broken, and the sample in the tube may be jetted and leaked. To avoid a tensioning zone (stretch zone) at the end portion of the sample tube, the fixing block and the fixing ring are added at the end portions of the sample tube and the drive tube, in this way, the end portion of the recovery container can be effectively protected from being blasted away. The recovery rate of diamond can reach 100%.

[0068] After the diamond is synthesized by means of detonation impact, the sample (namely, mixture of diamond, graphite, and copper powder) is taken out from the recovery container of the composite tube, to undergo selective oxidation acid treatment, so as to separate out the diamond in the sample, and then subsequent purification operations such as screening and grading of the diamond are performed.

[0069] In conclusion, the detonation synthesis device provided in the present disclosure can meet the high-temperature high-pressure condition for converting graphite into diamond, so that the sample graphite is uniformly compressed and converted into high-purity polycrystalline diamond in the device. The conversion rate is unprecedentedly improved to 90% or more; and the converted product, high-purity polycrystalline diamond, is completely recovered, with the recovery rate reaching 100%.

[0070] The inventors have successfully synthesized high-purity nano-structured polycrystalline diamond through the device, the conversion rate reaches 90% or more, the converted product, high-purity nano-structured polycrystalline diamond, is fully recovered by 100%, with the particle size being normally distributed in 0-32 μm, and the industrialized production can be fully realized.

[0071] The above-mentioned embodiments have further illustrated the objectives, the technical solutions, and the beneficial effects of the present disclosure in detail. It should be understood that the above-mentioned are merely specific embodiments of the present disclosure, rather than limiting the scope of protection of the present disclosure, and any amendments, equivalent replacements, improvements and so on made within the spirit and principle of the present disclosure should be covered within the scope of protection of the present disclosure.