Preparation method of rapid high-thermal-conductivity pressure transmission medium in ultrahigh-pressure environment

By mixing cerite with high thermal conductivity ceramics and preparing the pressure transfer medium using cold isostatic and hot press sintering technology, the problem of poor heat conduction in the existing medium in ultra-high pressure environment is solved, and efficient heat conduction and stable high-temperature and high-pressure performance are achieved.

CN120025161APending Publication Date: 2025-05-23YANSHAN UNIV
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Patent Information

Application Number
CN202510202693.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-02-24
Publication Date
2025-05-23

AI Technical Summary

Technical Problem

The existing high-thermal pressure transfer medium cannot quickly and effectively conduct heat in ultra-high pressure environments, resulting in the inability of the material to meet the design load in extreme service environments and resources are scarce.

Method used

By fully mixing cerite with high thermal conductivity ceramics evenly, using cold isostatic press forming technology, the mixed material is initially formed under uniform pressure, and then prepared by hot pressing and sintering to obtain a pressure transfer medium.

Benefits of technology

The prepared pressure transfer medium not only has the pressure transfer efficiency and pressure holding performance of traditional cerite media, but also can quickly and effectively conduct heat, with a thermal conductivity up to 100W/m·K and a cooling rate up to 1000k/s, which is suitable for high-temperature and high-pressure environments.

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Abstract

The invention discloses a preparation method of a rapid high-thermal-conductivity pressure transmission medium in an ultrahigh-pressure environment, and the medium is prepared by fully and uniformly mixing pyrophyllite and high-thermal-conductivity ceramic, then primarily molding the mixed material under uniform pressure by using a cold isostatic pressing molding technology, and then performing hot pressed sintering. The preparation method is simple, the process is easy to control, the prepared pressure transmitting medium not only has the pressure transmitting efficiency and pressure maintaining performance of a traditional pyrophyllite medium, but also has the capability of rapidly conducting heat in a sample out, the highest heat conductivity of the pressure transmitting medium can reach 100 W / m.K, the highest cooling rate can reach 1000 k / s, meanwhile, the pressure transmitting medium can bear the high-temperature and high-pressure environment, and the pressure transmitting medium is suitable for being used in the high-temperature and high-pressure environment. And the safety and the stability of the test sample in the test process are ensured.
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Claims

1. A method for preparing a fast high heat-conductivity pressure transfer medium under ultra-high pressure environment, characterized in that: Follow the steps below in order: (1) crushing pyrophyllite into powder with a particle size of 20-120 mesh, and then adding high thermal conductivity ceramic powder with a particle size of 10-50 mesh and mixing evenly; (2) adding a binder to the powder uniformly mixed in step (1), placing the powder in a high-strength alloy mold steel, and performing cold isostatic pressing at room temperature to obtain a green body; (3) The green body is placed in a muffle furnace and sintered in a nitrogen atmosphere to obtain a pressure transmission medium.

2. The method for preparing a fast high heat-conductivity pressure transfer medium under ultra-high pressure environment according to claim 1, characterized in that: In step (1), the mass ratio of the pyrophyllite powder to the high thermal conductivity ceramic powder is (4-19):

1.

3. The method for preparing a fast high heat-conductivity pressure transfer medium under ultra-high pressure environment according to claim 1, characterized in that: In step (1), the high thermal conductivity ceramic is one or more of AlN, BN, Mg3N2, TiN, Si3N4, and Mo2N.

4. The method for preparing a fast high heat-conductivity pressure transfer medium under ultra-high pressure environment according to claim 1, characterized in that: In step (2), the mass ratio of pyrophyllite to binder is (2-19):

1.

5. The method for preparing a fast high heat-conductivity pressure transfer medium under ultra-high pressure environment according to claim 1, characterized in that: In step (2), the binder is one or more of phenolic resin, magnesium aluminum silicate, polyvinyl chloride, 107 glue, white latex, and sodium silicate.

6. The method for preparing a fast high heat-conductivity pressure transfer medium under ultra-high pressure environment according to claim 1, characterized in that: In step (2), the pressure during the cold isostatic pressing treatment is 100-400 MPa and the time is 30 minutes.

7. The method for preparing a fast high heat-conductivity pressure transfer medium under ultra-high pressure environment according to claim 1, characterized in that: In step (3), the sintering process is carried out in the following order: (a) The first heating stage: from room temperature to 200 °C, and keep warm for 0.5 h; (b) The second heating stage, from 200°C to 800°C, kept at this temperature for 2-4h; (c) Cooling stage: cooling to room temperature along with the furnace.

8. The method for preparing a fast high heat-conductivity pressure transfer medium under ultra-high pressure environment according to claim 7, characterized in that: In step (3), the heating rate of the first heating stage is 2°C / min; the heating rate of the second heating stage is 5°C / min.

Citation Information

Patent Citations

  • Pyrophyllite formula

    CN103341340A