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High temperature structured ceramic material SiBONC and preparation method

A ceramic material, high temperature technology, applied in the field of amorphous silicon-based ceramics and its preparation technology, can solve the problems that structural stability, thermal shock resistance and chemical stability cannot be satisfied at the same time

Inactive Publication Date: 2005-01-12
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention provides a high-temperature structural ceramic material SiBONC and a preparation method thereof in order to solve the deficiency that existing ceramics cannot simultaneously satisfy structural stability, thermal shock resistance and chemical stability at high temperatures.

Method used

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specific Embodiment approach 1

[0004] Specific embodiment one: the high-temperature structural ceramic material of the present embodiment is made up of Si, B, O, N, C, wherein the molar ratio of Si, B, O, N, C is (1~6): 1: (2~ 8): (1~2): (0.2~0.5).

specific Embodiment approach 2

[0005] Embodiment 2: The high-temperature structural ceramic material of this embodiment is composed of Si, B, O, N, and C, wherein the molar ratio of Si, B, O, N, and C is 4:1:5:2:0.4.

specific Embodiment approach 3

[0006] Specific embodiment three: this embodiment is prepared according to the following steps: a, silicon tetrachloride and benzaldehyde are mixed according to the molar ratio of 1: (1-2), and reacted for 7-30 days under the irradiation of ultraviolet lamp , obtain low-molecular-weight silicon-oxygen polymer; b, add alkylamine in the silicon-oxygen polymer, wherein the volume ratio of alkylamine and silicon-oxygen polymer is (1~5): 1, control reaction temperature at 80~100 Under the condition of ℃, carry out the alkylation reaction for 8-12 hours, and obtain the Si-O-N organic polymer whose thermal decomposition temperature is 200-600 ℃; Under the condition of ℃, react for 10~15 hours, obtain Si-B-O-N-C organic polymer, wherein the molar ratio of Si / B is (1~6): 1; d, in the tubular atmosphere protection furnace, pass into inert gas, 400-1000°C, and the heating rate is controlled at 0.1-10°C / min to react for 8-12 hours to crack the Si-B-O-N-C organic polymer to obtain Si-B-O-N...

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Abstract

The material related by this invention is amorphous and crystallite ceramics composed of Si, B, O, N, C is mole ratio (1-6):1:(2-8):(1-2):(0.2-0.5). The prepn. steps are: a. silicon tetrachloride and benzaldehyde are mixed and illuminated by ultraviolet lamp to react to generate silica compound; b. alkylamine is put into the silicon compound to generate organic polymer Si-O-N, C. boron compound is put into into the organic polymer Si-O-N to generate organic polymer Si-B-O-N-C; d. organic polymer Si-B-O-N-C is splited to Si-B-O-N-C powder in pipe-type air protecting furnace; e. the prepared Si-B-O-N-C powder is fired to produce compacted ceramics Si-B-O-N-C by vacuum air heat pressing.

Description

Technical field: [0001] The invention relates to a ceramic material and a preparation process thereof, in particular to a high-temperature stable amorphous silicon-based ceramic and a preparation process thereof. Background technique: [0002] High-temperature resistant ceramics are an important class of high-tech new materials, which play a key role in automotive engines, aero engines, aerospace engines, aerospace heat-resistant components, magnetic fluid generators, and nuclear energy utilization. These fields require materials to have very high high temperature structural stability, thermal shock resistance and chemical stability, while silicon-based ceramics and their composite materials have low thermal expansion coefficient, high decomposition temperature and oxidation temperature, low Excellent comprehensive properties such as high density and low manufacturing cost are considered to be the most promising high-temperature ceramics. Traditional simple silicon-based co...

Claims

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Application Information

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IPC IPC(8): C04B35/01C04B35/622C04B35/64
Inventor 温广武李峰张俊宝宋亮
Owner HARBIN INST OF TECH
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