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Process for preparing SiBONC ceramic with high temp stabilized

A high-temperature stable, ceramic technology, applied in the field of preparation of amorphous silicon-based ceramics, can solve the problems of poor reliability and relatively high cost

Inactive Publication Date: 2006-01-25
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the problems that the existing silicon-based ceramics can only be used stably for a long time below 1200-1300°C, poor reliability when used as structural parts, and relatively high cost, the present invention provides a high-temperature stable SiBONC ceramics preparation method

Method used

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  • Process for preparing SiBONC ceramic with high temp stabilized
  • Process for preparing SiBONC ceramic with high temp stabilized
  • Process for preparing SiBONC ceramic with high temp stabilized

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specific Embodiment approach 1

[0015] Specific embodiment one: this embodiment includes the following steps: (one) synthesizing SiONC precursor; (two) synthesizing SiBONC precursor; (three) cracking SiBONC precursor, making SiBONC ceramic powder; the core content of this method In the step (1), the SiONC precursor is synthesized as follows: organic silicone oil and alkylamine are used as raw materials, dissolved in an organic solvent, mixed and stirred, and kept at 70-100° C. for 20-30 hours to synthesize the SiONC precursor. In the step (2) of this embodiment, the SiBONC precursor is synthesized as follows: Boride is introduced into the SiONC organic polymer, and reacted at 60-150°C for 5-15 hours to obtain the SiBONC organic polymer, wherein Si The molar ratio of / B is between 1:0.1-0.5, and the boron compound is boron trichloride, borane or diborane. In step (3), the SiBONC precursor is cracked to obtain SiBONC powder: In a tubular atmosphere protection furnace, nitrogen or inert gas is introduced, at 30...

specific Embodiment approach 2

[0016] Specific embodiment two: this embodiment differs from specific embodiment one in that it also includes step (four): the prepared SiBONC powder is sintered to obtain dense SiBONC amorphous and microcrystalline ceramic products, which can be passed through the following steps: The above two methods are realized: one method is to sinter the prepared Si-B-O-N-C powder in a pressure sintering furnace, feed nitrogen or inert gas, control the reaction temperature at 1100-1900 °C, and the heating rate is 5-50 °C / min , pressure of 0.1 ~ 10Mpa under the condition of heat preservation for 2 ~ 4 hours, after sintering to obtain dense SiBONC amorphous and microcrystalline ceramic products; another method is to prepare SiBONC powder in a vacuum / atmosphere hot pressing sintering furnace Sintering, heat preservation under the conditions of 1400-1900°C and 10-40MPa for 1-3 hours, and obtain dense SiBONC amorphous and microcrystalline ceramic products after sintering. Other reaction step...

specific Embodiment approach 3

[0017] Specific embodiment three: this embodiment takes high hydrogen-containing methyl silicone oil (HPSO) and ethylenediamine as raw materials, and toluene is a solvent, and it prepares SiBONC ceramics in this way: (1) get 120ml HPSO and be dissolved in 400ml toluene, and 44ml ethylenediamine and 100ml toluene are slowly dripped into the mixed solution of HPSO and toluene with a dropping funnel, and stirred for 24 hours with a stirrer to form a SiONC organic precursor; (2) 300gAlCl 3 with 200gKBF 4 Ball mill and mix in a special stainless steel reactor for 3-11 hours, and generate BCl in an oil bath at 70-180°C 3 , then the resulting BCl 3 The gas is passed into the SiONC organic precursor, and reacted at 70-100 °C for 10 hours to obtain the SiBONC organic polymer; (3) In the tubular atmosphere protection furnace, nitrogen gas is introduced, at 800-1000 °C, the heating rate Control the reaction at 1-5°C / min for 10 hours to crack the SiBONC organic polymer to obtain SiBONC ...

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Abstract

A process for preparing the SiBONC ceramic with high high-temp (1500-1800 deg. C) stability includes such steps as dissolving organic silica oil and alkylamine in organic solvent, stirring while heating at 70-100 deg. C for 20-30 hr to obtain precursor SiONC, preparing precursor SiBONC, and cracking to obtain SiBONC ceramic powder. Its advantages are high bending strength and breaking toughness, and high high-temp performance.

Description

Technical field: [0001] 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: [0002] The basic service environment and requirements of manufacturing materials such as advanced aerospace vehicle structural components, high-temperature engines, turbines, atomic reactor walls, catalyst heat exchangers and combustion systems, MEMS (microelectromechanical system) high-temperature sensors, and nuclear energy utilization are high temperature resistance and oxidation resistance. Corrosion, high-performance mass ratio, high reliability and long life, in these occasions, materials are required to have very high high temperature structural stability, thermal stability and chemical stability. Materials scientists have been working on researching various high-temperature-resistant new materials to meet these requirements. Silicon-based ceramics and...

Claims

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Application Information

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IPC IPC(8): C04B35/00C04B35/01C04B35/622C04B35/64C03B32/02
Inventor 温广武李峰白宏伟韩兆祥
Owner HARBIN INST OF TECH
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