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Process for preparing high temperature texture ceramic material SiBONC

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

Inactive Publication Date: 2006-01-18
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention provides a method for preparing SiBONC, a high-temperature structural ceramic material, in order to solve the deficiency that the 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

[0005] 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

[0006] 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

[0007] 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 present invention relates to preparation process of ceramic material. The preparation process of high temperature structural ceramic material SiBONC includes the following steps: A. mixing silicon tetrachloride and benzaldehyde and irradiating the mixture with ultraviolet lamp for reaction to obtain Si-O polymer; B. adding alkyl amine into the silica polymer to obtain organic Si-O-N polymer; C. adding boride into the organic Si-O-N polymer to obtain organic Si-B-O-N-C polymer; D. cracking organic Si-B-O-N-C polymer in tubular protecting atmosphere furnace to obtain Si-B-O-N-C powder; E. sintering the Si-B-O-N-C powder in vacuum / atmospheric pressure to obtain compact Si-B-O-N-C ceramic. The Si-B-O-N-C ceramic has simple preparation process, and low cost.

Description

[0001] This application is a divisional application with the filing date: April 14, 2004, the application number: 200410013682.6, and the title of the invention: a high-temperature structural ceramic material SiBONC and its preparation method. Technical field: [0002] The invention relates to a preparation process of a ceramic material, in particular to a preparation process of a high-temperature stable amorphous silicon-based ceramic. Background technique: [0003] 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 te...

Claims

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Application Information

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IPC IPC(8): C04B35/01C04B35/622C03B32/02
Inventor 温广武李峰张俊宝宋亮
Owner HARBIN INST OF TECH
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