Precursor conversion preparation method of nitride ceramic material

A technology for converting nitride ceramics and precursors, which is applied in the field of precursor conversion and preparation of nitride ceramic materials, can solve problems such as product foaming and cracking, and achieve the effects of easy molding, simple process, and high purity

Inactive Publication Date: 2011-08-31
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the existing precursor pyrolysis conversion process to prepare nitride ceramic materials often produces defects such as foaming and cracking

Method used

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  • Precursor conversion preparation method of nitride ceramic material
  • Precursor conversion preparation method of nitride ceramic material
  • Precursor conversion preparation method of nitride ceramic material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Perhydropolysilazane (molecular structure [SiH 2 NH] n ) placed in a closed pressure vessel, heated to 120°C under the protection of an inert atmosphere of 0.3MPa, and kept for 3 hours until cross-linking and solidification occurs, and a white solid is obtained;

[0023] (2) Put the cross-linked cured product obtained in step (1) in a cracking furnace, heat it to 1000° C. in an ammonia atmosphere, keep it warm for 1 hour, and crack it to obtain the required silicon nitride ceramics.

[0024] The prepared silicon nitride ceramic has no defects such as foaming and cracking.

Embodiment 2

[0026] (1) Put borazine (borazine is a six-membered ring with B:N=1:1) in a closed pressure vessel, heat it to 80°C under the protection of an inert atmosphere of 5MPa, and keep it warm for 72 hours until Cross-linking and solidification occurred to obtain a white solid.

[0027] (2) Place the cross-linked solidified product obtained in step (1) in a cracking furnace, heat it to 800°C in a nitrogen atmosphere, keep it warm for 1.5 hours, and crack it to obtain the desired boron nitride ceramics.

[0028] The prepared boron nitride ceramic has no defects such as foaming and cracking.

Embodiment 3

[0030] 1) Polyborosilazane (molecular structure is Place in a closed pressure vessel, heat to 100°C under the protection of an inert atmosphere of 8 MPa, and keep the temperature for 12 hours until cross-linking and solidification occurs, and a white solid is obtained.

[0031] (2) Put the cross-linked cured product obtained in step (1) in a cracking furnace, heat it to 700°C in a continuous vacuum environment, keep it warm for 1.2 hours, and crack it to obtain the required silicon boron nitrogen ceramics.

[0032] The prepared silicon boron nitrogen ceramics have no defects such as foaming and cracking.

[0033] The performance of the nitride ceramic material prepared by embodiment 1, embodiment 2 and embodiment 3 is as follows:

[0034] The performance of the nitride ceramic material prepared by the embodiment 1, 2, 3 of table 2

[0035]

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Abstract

The invention relates to a precursor conversion preparation method of a nitride ceramic material, which comprises the following steps: (1) placing elemento-organic polymer containing basic chemical bond structures of nitride ceramic in a closed pressure vessel, and preserving the temperature at 50-200 DEG C for 2-80 hours in an inert atmosphere of 0.2-10 MPa to carry out crosslinking and curing; and (2) placing the crosslinking and curing product obtained in the step (1) in a pyrolyzer, and preserving the temperature at 600-1100 DEG C for 0.5-2 hours to carry out pyrolysis, thus obtaining the required nitride ceramic. The invention has the advantages of simple operation steps, low preparation temperature and low requirement for equipment; and the prepared nitride ceramic material has adjustable molecular composition and high purity, can be easily molded, and is applicable to the preparation of components with complicated shapes.

Description

technical field [0001] The invention relates to a method for preparing a nitride ceramic material, more specifically, to a method for preparing a precursor conversion of a nitride ceramic material. Background technique [0002] With the rapid development of science and technology, aviation, aerospace, energy and many other high-tech fields have put forward more and more urgent demands for high-performance materials. Because ceramics have excellent high temperature resistance, ablation resistance, wear resistance, high hardness and other characteristics, and have high elastic modulus and low density, some ceramic matrix composites also have heat resistance, heat insulation, Therefore, all developed countries in the world regard ceramic materials as high-tech new materials that have an important impact on the future of mankind and focus on research. [0003] For ceramic materials, the most traditional preparation process is sintering process, such as hot pressing sintering, r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/58C04B35/622
Inventor 李斌张长瑞曹峰王思青曹英斌周新贵刘坤
Owner NAT UNIV OF DEFENSE TECH
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