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SiBCN composite material and preparation method thereof

A composite material and silicon boron carbon nitride technology, which is applied in the field of preparation of silicon boron carbon nitrogen composite materials, can solve the problems of poor uniformity of composite materials, high energy consumption and high reaction temperature

Active Publication Date: 2015-03-04
山东鑫润建新材料科技产业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the uniformity of the composite material prepared by this method is not very good, and the reaction temperature is high during the preparation process, and the energy consumption is large

Method used

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  • SiBCN composite material and preparation method thereof
  • SiBCN composite material and preparation method thereof
  • SiBCN composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Preparation of polyborosilazane: use ammonia as nitrogen source to ammonolyze methylvinyl dichlorosilane to form polysilazane, and then use dimethyl sulfide borane as boron source to borohydropolysilazane to obtain polyborosilazane Alkanes (synthesis of polyborosilazane by hydroboration reaction and preparation of SiBCN ceramics by hot pressing-pyrolysis. Journal of Silicates, 38, 1533-37, 2010).

[0042] Preparation of silicon-boron-carbon-nitrogen-based composite materials: 40kg polyborosilazane and 150kg cyclohexane were placed in a reactor, and then argon or nitrogen was flushed into the reactor as a protective gas, and then 60kg of liquid-phase SiCl 4 Add it into the reaction kettle, the temperature in the reaction kettle is 300° C., and the reaction time is 4 hours to obtain a mixture of polyborosilazane.

[0043] Under an inert or active atmosphere, heat the mixture of polyborosilazane and react at a rate of 10°C / min to 1300°C for 1 hour to prepare a silicon-boro...

Embodiment 2

[0046] Preparation of polyborosilazane: use ammonia as nitrogen source to ammonolyze methylvinyl dichlorosilane to form polysilazane, and then use dimethyl sulfide borane as boron source to borohydropolysilazane to obtain polyborosilazane Alkanes (synthesis of polyborosilazane by hydroboration reaction and preparation of SiBCN ceramics by hot pressing-pyrolysis. Journal of Silicates, 38, 1533-37, 2010).

[0047] Preparation of silicon-boron-carbon-nitrogen-based composite materials: 20kg of polyborosilazane and 60kg of n-hexane were placed in the reactor, and then argon or nitrogen was flushed into the reactor as a protective gas, and then 10kg of liquid-phase SiCl 4 Add it into the reaction kettle, the temperature in the reaction kettle is 100° C., and the reaction time is 12 hours to obtain a mixture of polyborosilazane.

[0048] Under an inert or active atmosphere, heat the mixture of polyborosilazane and raise the temperature to 800° C. at a rate of 20° C. / min for 6 hours ...

Embodiment 3

[0051] Preparation of polyborosilazane: use ammonia as nitrogen source to ammonolyze methylvinyl dichlorosilane to form polysilazane, and then use dimethyl sulfide borane as boron source to borohydropolysilazane to obtain polyborosilazane Alkanes (synthesis of polyborosilazane by hydroboration reaction and preparation of SiBCN ceramics by hot pressing-pyrolysis. Journal of Silicates, 38, 1533-37, 2010).

[0052] Preparation of silicon-boron-carbon-nitrogen-based composite materials: 30kg of polyborosilazane and 100kg of cyclohexane were placed in a reactor, and then argon or nitrogen was flushed into the reactor as a protective gas, and then 45kg of liquid-phase SiCl 4 Add it into the reaction kettle, the temperature in the reaction kettle is 200° C., and the reaction time is 8 hours to obtain a mixture of polyborosilazane.

[0053] Under an inert or active atmosphere, heat the mixture of polyborosilazane to 1000°C at a rate of 1°C / min to react for 4 hours to prepare a silicon...

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Abstract

The invention relates to a SiBCN composite material and a preparation method thereof. The SiBCN composite material is prepared by mixing and heating polyborosilazane, an organic solvent and a liquid-phase chloride which are used as raw materials. The preparation method comprises the following typical steps: the polyborosilazane and the organic solvent are placed in a reaction kettle, the liquid-phase chloride is added into the reaction kettle and reaction is carried out under the inert or reactive atmosphere condition to obtain a polyborosilazane mixture, and the polyborosilazane mixture is heated and reaction is carried out under the inert or reactive atmosphere, so that the SiBCN composite material is prepared. Through the adoption of the method, the SiBCN composite material can be directly prepared form an undefined structure, so that the mixing uniformity on the atomic scale can be achieved, and the mechanical property of the sintered composite material is remarkably improved.

Description

technical field [0001] The invention relates to the preparation of a silicon-boron-carbon-nitrogen composite material, in particular to a silicon-boron-carbon-nitrogen-based composite material and a preparation method thereof. Background technique [0002] Silicon boron carbon nitrogen ceramics have light weight, low thermal expansion coefficient, high hardness, high modulus, corrosion resistance and excellent high temperature resistance, oxidation resistance and creep resistance. They are important ultra-high temperature ceramic systems and can be applied to high temperature engines , Turbines, atomic reactor walls, MEMS high-temperature sensors, catalyst heat exchange systems, combustion systems, thermal protection systems, aerospace and other devices and high-tech fields, therefore, the development of new silicon-boron-carbon-nitrogen-based composite materials has important application significance. [0003] Silicon-boron-carbon-nitrogen ceramics are generally prepared by...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/58C04B35/622
Inventor 华文蔚
Owner 山东鑫润建新材料科技产业有限公司
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