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Synthesis method of five-component SiBCNZr ceramic precursor

A technology of ceramic precursors and synthesis methods, which is applied in the field of polymer materials, can solve the problems of poor oxidation resistance of SiBCN ceramic precursors, achieve excellent melting point and oxidation resistance, improve oxidation resistance, and improve oxidation resistance.

Active Publication Date: 2022-03-22
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention is to solve the problem that the SiBCN ceramic precursor prepared by the existing method has poor oxidation resistance, and provides a kind of synthetic method of the five-component SiBCNZr ceramic precursor

Method used

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  • Synthesis method of five-component SiBCNZr ceramic precursor
  • Synthesis method of five-component SiBCNZr ceramic precursor
  • Synthesis method of five-component SiBCNZr ceramic precursor

Examples

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specific Embodiment approach 1

[0025] Specific embodiment one: the synthetic method of a kind of five-component SiBCNZr ceramic precursor of this embodiment is to be finished according to the following steps:

[0026] 1. Mix methyltrichlorosilane and boron trichloride and stir in an oil bath at a temperature of 1 to 3°C for 0.5 to 1 hour to obtain precursor solution A; the mixture of methyltrichlorosilane and boron trichloride The amount ratio of substances is 1:(3~5);

[0027] 2. Add hexamethyldisilazane dropwise into the precursor solution A through a constant pressure separatory funnel, and feed N 2 and continue stirring for 0.5-1 h in an oil bath at a temperature of 1-3° C. to obtain precursor solution B; the hexamethyldisilazane has the same quality as boron trichloride in step 1;

[0028] 3. Raise the reaction temperature of the precursor solution B from 1 to 3°C to 150 to 170°C, and crosslink for 4 to 6 hours at a temperature of 150 to 170°C to obtain the precursor solution C;

[0029] 4. Lower the...

specific Embodiment approach 2

[0032] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the low temperature control of the oil bath in step 1 is realized by adding ice cubes into the water bath and setting a circulating cooling device in the condensation pipe. Others are the same as the first embodiment.

[0033] In this embodiment, low temperature control is realized through cooperation of ice cubes and a circulating cooling device.

specific Embodiment approach 3

[0034] Embodiment 3: This embodiment is different from Embodiment 1 or 2 in that: the molar ratio of methyltrichlorosilane to boron trichloride in step 1 is 1:4. Others are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a synthesis method of a five-component SiBCNZr ceramic precursor, belongs to the technical field of high polymer materials, and particularly relates to the synthesis method of the five-component SiBCNZr ceramic precursor. The invention aims to solve the problem of poor oxidation resistance of the SiBCN ceramic precursor prepared by the existing method. In the curing process, Zr and other elements are crosslinked in the SiBCN-based precursor, that is, Si, N, B, C and Zr are connected through covalent bonds, and a precursor polymer containing a large amount of Si, B, N, C and Zr elements is formed. The structure of the SiBCNZr ceramic precursor can be effectively adjusted, and the uniformity of element distribution in the precursor is ensured. Then, small molecules of the precursor are removed through a curing reaction to form a high polymer, and finally, the SiBCNZr ceramic material with stable covalent bond connection can be obtained at a high yield through pyrolysis. The preparation method is used for the five-component SiBCNZr ceramic precursor.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a synthesis method of a five-component SiBCNZr ceramic precursor. Background technique [0002] With the development of science and technology, the performance requirements of high temperature materials are getting higher and higher. Silicon-based ceramics (such as SiC, Si 3 N 4 etc.) have the advantages of high strength, high hardness, excellent oxidation resistance, thermal stability and chemical stability, and are an important class of advanced high-temperature materials. Silicon-based ceramic parts are manufactured using powder processing techniques, including powder synthesis, powder processing (such as grinding and mixing), forming and sintering. Due to the inherent brittleness of ceramic materials and the rise of ceramic fibers, the preparation process of traditional ceramics has gradually changed, and the development of ceramic precursors has been...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G77/62C08G77/00C04B35/14C04B35/48C04B35/622
CPCC08G77/62C08G77/00C04B35/481C04B35/48C04B35/14C04B35/622C04B2235/483
Inventor 韩文波吕杨赵广东周善宝汪梦宇张幸红
Owner HARBIN INST OF TECH