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Silicon boron carbon nitrogen ceramic and preparation method thereof

A technology of silicon boron carbon nitrogen ceramics and carbon chains, which is applied in the field of silicon boron carbon nitrogen ceramics and its preparation, can solve the problems of high sintering temperature, inability to guarantee the purity and quality of composite materials, and harsh conditions, and achieve excellent high temperature performance.

Active Publication Date: 2014-04-30
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method requires spark plasma sintering or hot pressing sintering, and the sintering temperature is as high as 1400-2000 o C, even a high pressure of 50MPa is required, and the conditions are harsh, so that the purity and quality of the obtained composite materials cannot be guaranteed

Method used

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  • Silicon boron carbon nitrogen ceramic and preparation method thereof
  • Silicon boron carbon nitrogen ceramic and preparation method thereof
  • Silicon boron carbon nitrogen ceramic and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1: Take 9.58 ml (0.144 mol) of ethylenediamine, 41.74 ml (0.3 mol) of triethylamine, 50 ml of toluene, mix well, take 9.45 ml (0.072 mol) of vinyl chlorosilane, 7.5 ml of methyl hydrochlorosilane ml (0.072 mol) and 100 ml of toluene are mixed evenly, and the two mixtures are mixed and heated to 120 o C reaction. Remove the reaction by-products by filtration, add 12 ml (0.024 mol) of toluene solution of thioether borane to the mixed solution, mix well and cool to 0 o C reaction, the toluene solution of polyborosilamine alkane is obtained. The toluene solvent was distilled off to obtain polyborosilamine. Under the protection of argon atmosphere (helium, nitrogen, air can be used), 1000 o C Pyrolysis of polyborosilamine to produce silicon boron carbon nitrogen ceramics. 13 C solid-state NMR analysis of the structure of polyborosilamide, visible -CH 2 -CH 2 -Characteristic peaks, indicating that polyborosilamine contains two carbon structures, as attached fig...

Embodiment 2

[0031]Embodiment 2: adopt the technology of the present invention, experiment process and condition are the same as embodiment 1, change the amount of the toluene solution that adds thioether borane to be 36 ml (0.072 mol), distill and remove the polyborosilamine that toluene solvent makes, Pyrolyzing the polyborosilamine to prepare silicon-boron-carbon-nitrogen ceramics.

Embodiment 3

[0032] Embodiment 3: adopt the technology of the present invention, experimental process and condition are the same as embodiment 1, change the amount of the toluene solution that adds thioether borane to be 24 ml (0.048 mol), remove toluene solvent by distillation and make polyborosilamine, heat Decompose the polyborosilamine to prepare silicon-boron-carbon-nitrogen ceramics.

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Abstract

The invention relates to silicon boron carbon nitrogen ceramic and a preparation method thereof, and in particular, the preparation method is as follows: using a double carbon chain or multiple carbon chain structure unit based amine as a reactant for aminolysis of chlorosilane and then hydroboration for synthesis of poly boron silicon alkyl amine, using the poly boron silicon alkyl amine as a precursor for pyrolysis preparation of the silicon boron carbon nitrogen ceramic. By introduction of a double carbon chain into a precursor structure for synthesis of the poly boron silicon amine alkane, C-N bond bonding is formed to promote the production of a silicon carbonitride and help to improve the high temperature performance of the silicon boron carbonitride ceramic. The preparation method for preparing the silicon boron carbonitride ceramic has the advantages high composition and structure designability and the like, and is suitable for the preparation of high purity ceramic. The silicon boron carbonitride ceramic prepared by the preparation method is controllable in composition, adjustable in carbon and boron content, and capable of preparing the silicon boron carbonitride ceramic having excellent high temperature performances, and can be used in aerospace, high temperature systems, machinery, metallurgy, chemical industry and other fields.

Description

technical field [0001] The invention relates to a silicon-boron-carbon-nitrogen ceramic and a preparation method thereof. Specifically, polyborosilamine is synthesized by a chemical method, and then the silicon-boron-carbon-nitrogen ceramic is prepared by pyrolyzing the polyborosilamine as a precursor, which belongs to the field of material preparation. Background technique [0002] Silicon boron carbon nitrogen ceramics is a new type of ceramic material with an amorphous network structure formed by the pyrolysis of polymer precursor polyborosilazane. Silicon boron carbon nitrogen ceramics have the advantages of light weight, high strength, and high temperature resistance, and can be used to develop high temperature Structural ceramics are used in aerospace, high temperature protection, machinery, metallurgy, chemical industry and other fields. Polyborosilazane is a polymer containing silicon, boron, carbon, and nitrogen. Its pyrolysis can form silicon-boron-carbon-nitrogen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/58C04B35/622
Inventor 李亚利劳浔何思斯苏冬
Owner TIANJIN UNIV
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