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Preparation method of Si-B-C-N (silicon-boron-carbon-nitrogen) ceramic with PBSZ (polyborosilazane) as additive

A polysilaborazane and silicon boron carbonitride technology, which is applied in the field of preparation of silicon boron carbonitride ceramics, and can solve the problems of difficult sintering and dense materials, unfavorable high temperature performance of materials, and the like.

Active Publication Date: 2017-03-22
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems in the above-mentioned prior art, that is, the pure silicon boron carbon nitrogen ceramic material is difficult to sinter and compact, and the "heterogeneous" additive is not conducive to the high temperature performance of the material

Method used

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  • Preparation method of Si-B-C-N (silicon-boron-carbon-nitrogen) ceramic with PBSZ (polyborosilazane) as additive
  • Preparation method of Si-B-C-N (silicon-boron-carbon-nitrogen) ceramic with PBSZ (polyborosilazane) as additive
  • Preparation method of Si-B-C-N (silicon-boron-carbon-nitrogen) ceramic with PBSZ (polyborosilazane) as additive

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Embodiment 1

[0023] The preparation method of a kind of silicon boron carbon nitrogen ceramics that uses polysilaborazane as an additive involved in this embodiment is specifically carried out in accordance with the following steps: 1. According to the Si:B:C:N molar ratio of 2:1:3 Cubic silicon powder, hexagonal boron nitride powder and graphite powder are weighed in a ratio of 1; the silicon powder has a purity of 99% to 99.9% and a particle size of 1 to 20 μm; the graphite powder has a purity of 99% to 99.9% and a particle size of 1~20μm; the purity of boron nitride powder is 99%~99.9%, and the particle size is 1~20μm; 2. Put the weighed raw materials into a ball mill jar, and perform high-energy ball milling under the protection of argon atmosphere to obtain amorphous Si- B-C-N ceramic powder; wherein the mass ratio of the ball to material is 40:1, the diameter of the ball is 8mm, and the ball milling time is 25h; 3. Mix the amorphous Si-B-C-N ceramic powder obtained in step 2 with PBSZ...

Embodiment 2

[0027] The preparation method of a kind of silicon boron carbon nitrogen ceramics that uses polysilaborazane as an additive involved in this embodiment is specifically carried out in accordance with the following steps: 1. According to the Si:B:C:N molar ratio of 2:1:3 Cubic silicon powder, hexagonal boron nitride powder and graphite powder are weighed in a ratio of 1; the purity of cubic silicon powder is 99% to 99.9%, and the particle size is 1 to 20 μm; the purity of graphite powder is 99% to 99.9%. The particle size is 1-20 μm; the purity of the hexagonal boron nitride powder is 99%-99.9%, and the particle size is 1-20 μm; 2. Put the weighed raw materials into a ball mill jar, and perform high-energy ball milling under the protection of an argon atmosphere Obtain amorphous Si-B-C-N ceramic powder; wherein the mass ratio of ball to material is 35:1, the diameter of the ball is 8mm, and the ball milling time is 30h; three, the amorphous Si-B-C-N ceramic powder obtained in ste...

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Abstract

The invention provides a preparation method of Si-B-C-N (silicon-boron-carbon-nitrogen) ceramic with PBSZ (polyborosilazane) as an additive and belongs to the technical field of preparation methods of the Si-B-C-N ceramic. The method comprises steps as follows: S1, cubic silicon powder, hexagonal boron nitride powder, graphite powder and PBSZ are weighed in the mole ratio and in percentage by mass and taken as raw materials for standby use; S2, the raw materials weighed in S1 are put in a ball milling tank, high-energy ball milling is performed under the protection of the argon atmosphere, and ceramic powder containing amorphous Si-B-C-N is obtained; the ball-to-powder ratio of a ball material is (10-90):1, the ball milling diameter is 5-9 mm, and the ball milling time lasts 10-60 h; S3, the amorphous Si-B-C-N ceramic powder obtained in S2 is mixed with PBSZ, ball milling is performed under the protection of the argon atmosphere, and SiBCN compound powder is obtained; the ball-to-powder ratio is (1-20) :1, the ball milling diameter is 5-9 mm, and the ball milling time lasts 10-30 h; S4, the SiBCN obtained in S3 is subjected to spark plasma sintering, and the Si-B-C-N ceramic material with PBSZ as the additive is obtained.

Description

technical field [0001] The invention relates to a preparation method of silicon-boron-carbon-nitride (Si-B-C-N) ceramics with polysilaborazane (PBSZ) as an additive, and belongs to the technical field of preparation methods of silicon-boron-carbon-nitride ceramics. Background technique [0002] Aircraft nose cones, wing leading edges, rudder surfaces, cover plates, fairings, turbine blades, nozzles, etc. all face harsh environments of high temperature, thermal shock, ablation, and airflow erosion during service. The performance of high-temperature structural materials puts forward more stringent requirements. Silicon boron carbon nitride (Si-B-C-N) ceramic material has low density, high strength, low modulus, good thermophysical properties (low thermal expansion coefficient) and high temperature performance (oxidation / thermal shock, ablation), and has become a Novel high-temperature structures in , and candidate materials for multifunctional heat protection. [0003] The i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/58C04B35/634
CPCC04B35/58C04B35/63444C04B2235/77C04B2235/785C04B2235/96
Inventor 杨治华梁斌贾德昌段小明周玉
Owner HARBIN INST OF TECH
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