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Preparation method for in-situ synthesizing of conical SiC crystal whisker through coprecipitation and thermal evaporation technology

An in-situ synthesis and thermal evaporation technology, applied in chemical instruments and methods, single crystal growth, crystal growth, etc., can solve the problems of uneven whisker growth, incomplete transformation, difficult application, etc., and achieve a simple and good preparation method. Economic and social benefits, the effect of improving oxidation resistance

Active Publication Date: 2017-08-18
无锡博智复合材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The uneven growth and incomplete transformation of the whiskers make it difficult to apply in industrial production

Method used

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  • Preparation method for in-situ synthesizing of conical SiC crystal whisker through coprecipitation and thermal evaporation technology
  • Preparation method for in-situ synthesizing of conical SiC crystal whisker through coprecipitation and thermal evaporation technology
  • Preparation method for in-situ synthesizing of conical SiC crystal whisker through coprecipitation and thermal evaporation technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Take carbon felt (0.43-0.45g / cm 3 ) was cut, sheared and ground into a sample with a size of 10×10×10 mm and a flat surface, and the sample was put into a graphite mold holder and loaded into a CVI furnace. Vacuumize the furnace chamber, then open the argon valve for flushing. Repeat this 3 times; start the temperature and time control program, raise the temperature to 1000°C, the heating rate is 4°C / min, and the heating time is 4h, and the argon gas is supplied for protection, and the argon flow rate is 1500ml / min; when the temperature reaches 1000°C, Open the natural gas valve, set the natural gas flow rate to 80L / h, and set the Ar gas flow rate to 1600ml / min at the same time, and deposit for 1.5h; close the natural gas valve and flow meter, adjust the argon flow rate to 1500ml / min, turn off the power, and naturally Cool to room temperature; close the argon gas valve and flowmeter, and the experiment ends.

[0059] The carbon fiber preform deposited with the carbon ...

Embodiment 2

[0063] Take carbon felt (0.43-0.45g / cm 3 ) was cut, sheared and ground into a sample with a size of 10×10×10 mm and a flat surface, and the sample was put into a graphite mold holder and loaded into a CVI furnace. Vacuumize the furnace chamber, then open the argon valve for flushing. Repeat this 3 times; start the temperature and time control program, raise the temperature to 1000°C, the heating rate is 4°C / min, and the heating time is 4h, and the argon gas is supplied for protection, and the argon flow rate is 1500ml / min; when the temperature reaches 1000°C, Open the natural gas valve, set the natural gas flow rate to 80L / h, and set the Ar gas flow rate to 1600ml / min at the same time, deposit for 3h; close the natural gas valve and flow meter, adjust the argon flow rate to 1500ml / min, turn off the power, and cool naturally to room temperature; close the argon gas valve and flowmeter, and the experiment ends.

[0064] The carbon fiber preform deposited with the carbon source...

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Abstract

The invention relates to a preparation method for in-situ synthesizing of conical SiC crystal whisker through a coprecipitation and thermal evaporation technology. The preparation method comprises the steps of depositing a layer of carbon on a carbon fiber prefabricated body through a CVI method, filling defects on the surface of the prefabricated body and providing sufficient reaction raw materials; then putting the prefabricated body into a urea solution containing a catalyst to be dipped, calcining and reducing to obtain a nano catalyst; then suspending a sample containing the nano catalyst at the position of the top end in a graphite mold where silicon powder and carbon powder are loaded and evenly mixed and then obtaining the conical SiC crystal whisker through thermal treatment in certain temperature. The preparation method disclosed by the invention is simple, free of pollution, safe and stable, can effectively improve oxidation resistance, breaking tenacity and creep resistance of a composite material and combination strength between a base body and an enhanced body, can be applied to carbon / carbon, carbon / ceramic, magnesium-based and aluminum-based composite materials and has very good economical and social benefits.

Description

technical field [0001] The invention belongs to the application of conical whiskers prepared by co-precipitation + thermal evaporation technology in the technical field of composite materials, and relates to a preparation method for in-situ synthesis of conical SiC whiskers by co-precipitation and thermal evaporation technology. Background technique [0002] Carbon / carbon composites are a new type of structural material in the field of aerospace. Due to its high specific strength, high specific modulus, high thermal conductivity, low expansion, and excellent thermal shock resistance, it has been widely used in aerospace, military, medicine, construction and other fields. However, carbon / carbon composites are prone to oxidation in an oxygen-containing atmosphere, and when carbon / carbon composites are used as structural engineering components, most of them are in an oxidizing atmosphere, which greatly reduces the service life of engineering components. With the development of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/36C30B29/62C04B35/80C04B35/83
CPCC04B35/80C04B35/83C04B2235/5248C04B2235/5276C30B29/36C30B29/62
Inventor 史小红闫宁宁杨莉李贺军
Owner 无锡博智复合材料有限公司
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