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Method for preparing SiBCN(O) ceramic material

A technology of ceramic materials and ceramic precursors, which is applied in the field of preparation of multi-component ceramic materials, can solve the problems of high cost, complicated operation, and poor safety of SiBCN ceramic materials, and achieve the effects of low toxicity, simple operation, and low production cost

Inactive Publication Date: 2010-05-05
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a preparation method of SiBCN (O) ceramic material in order to solve the problems of high cost, poor safety and complicated operation of SiBCN ceramic material prepared by organic precursor method

Method used

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Effect test

specific Embodiment approach 1

[0007] Specific embodiment one: the preparation method of SiBCN (O) ceramic material in the present embodiment is as follows: one, silicon source and boron source are added in the solvent according to the molar ratio of 3~9: 1 to make mixture, then the mixture is vacuum Stir in a reactor with a pressure of 0.01MPa to 0.03MPa for 30h to 60h, then add ammonium carbamate, then raise the temperature in the reactor to 40°C to 200°C and keep it warm for 30h to 100h, stir while keeping it warm, and then put the reaction The temperature in the kettle is lowered to room temperature; 2. Vacuum filter the product obtained in the reaction kettle in step 1 under the conditions of a vacuum degree of 0.01MPa to 0.02MPa and a temperature of 60°C to 100°C to obtain SiBCN(O) ceramics Precursor; 3. Pyrolyze the SiBCN(O) ceramic precursor under the protection of an inert gas at a temperature of 1000°C to 1200°C for 1h to 3h, and then cool to room temperature to obtain a SiBCN(O) ceramic material; ...

specific Embodiment approach 2

[0010] Embodiment 2: This embodiment differs from Embodiment 1 in that the boron source in step 1 is sodium borohydride, potassium borohydride, borane or boron trichloride. Others are the same as in the first embodiment.

[0011] The SiBCN(O) ceramic material obtained in this embodiment does not crystallize and decompose under the condition of 1500° C. for a long time, and has excellent oxidation resistance.

specific Embodiment approach 3

[0012] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that the silicon source described in step one is methylvinyldichlorosilane, vinyltrichlorosilane, vinyldichlorosilane, divinylbenzene One or a combination of chlorosilane and trivinylchlorosilane. Others are the same as in the first or second embodiment.

[0013] When the silicon source described in this embodiment is a composition, various silicon sources are mixed in any ratio.

[0014] The SiBCN(O) ceramic material obtained in this embodiment does not crystallize and decompose under the condition of 1500° C. for a long time, and has excellent oxidation resistance.

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Abstract

The invention discloses a method for preparing a SiBCN(O) ceramic material, which relates to a method for preparing a multivariate ceramic material and solves the problems of high cost, poor safety and complicated operation of an organic precursor method for preparing the SiBCN ceramic material. The method comprises the following steps of: stirring a mixture of a silicon source, a boron source and a solvent for 48-60 hours in a reaction kettle and then adding ammonium carbamate; raising the temperature in the reaction kettle, preserving the temperature and cooling; carrying out vacuum filtration to obtain a SiBCN quaternary ceramic precursor; pyrolyzing the SiBCN quaternary ceramic precursor for 1-3 hours under the condition of inert gas shielding; and cooling the pyrolyzed precursor to room temperature to obtain the SiBCN(O) ceramic material. The process of preparing the SiBCN(O) ceramic material has no drastic exothermic reactions, the reactions are mild, and operations are simple. Raw materials adopted by the method have low toxicity, low price, low manufacturing cost, no influence on the health of operating personnel and good safety.

Description

technical field [0001] The invention relates to a preparation method of a multi-element ceramic material. Background technique [0002] The preparation method of existing SiBCN ceramic material is mainly the organic precursor method, although the SiBCN ceramic material obtained by the organic precursor method has excellent high temperature performance and good oxidation resistance, but the organic precursor method also has the following problems: 1 1. The raw materials used in the organic precursor method are poisonous, expensive, and borane complexes or haloboranes are not easy to preserve, which not only increases the production cost of SiBCN ceramic materials, but also endangers the health of operators and has poor safety; 2. Organic The reaction process of the precursor method has very strict requirements on experimental conditions and test equipment. The reaction process needs to be carried out in a protective atmosphere, and the ammonolysis / aminolysis reaction process ...

Claims

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Application Information

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IPC IPC(8): C04B35/622C04B35/58
Inventor 贾德昌孙振淋周玉杨治华
Owner HARBIN INST OF TECH
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