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Method for preparing carborundum whisker reinforced carborundum composite material element

A technology of silicon carbide whiskers and composite materials, which is applied in the field of preparation of ceramic matrix composite materials and their parts, can solve the problems of uneven density of forming blanks, poor uniformity of forming blank density, and low dimensional accuracy, and achieve size and performance The effect of good consistency, uniform structure and performance, and high dimensional accuracy

Inactive Publication Date: 2007-09-19
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the traditional powder metallurgy molding method has a simple process, the formed blank formed by molding often has uneven density, and the complexity of the shape of the parts is also limited to a certain extent.
However, in addition to being limited by the complexity of the components, the precursor impregnation and pyrolysis method also has disadvantages such as long preparation cycle and low dimensional accuracy.
Although slip casting and filter press forming can form parts with complex shapes, their application range is limited due to the poor density uniformity and low dimensional accuracy of the formed blank.

Method used

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  • Method for preparing carborundum whisker reinforced carborundum composite material element

Examples

Experimental program
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Effect test

Embodiment 1

[0017] The SiC micropowder and SiC whisker are uniformly mixed according to the ratio of SiC micropowder:SiC whisker=100:8 by mass percentage to prepare premixed powder. The binder adopts polycarbosilyl multi-component binder, and the weight percentage of each component is PCS:PW:HDPE:SA=40:45:10:5. The binder was kneaded on a kneader at a temperature of 120° C. for 2 hours and then kneaded with the premixed powder on a kneader at a temperature of 120° C. for 2 hours, and the powder loading was 54% by volume. After granulation, injection molding is performed on an injection machine, the injection temperature is 140°C, the injection pressure is 110MPa, and the mold temperature is 30°C. Heat the obtained SiCw / SiC composite part forming body in a thermal degreasing furnace under the protection of hydrogen to 200°C for 0.5 hours, then raise the temperature to 380°C for 0.5 hours, and continue to heat up to 500°C for 1 hour to completely remove the bond agent. Continue to raise t...

Embodiment 2

[0019] The SiC micropowder and SiC whisker are uniformly mixed according to the ratio of SiC micropowder:SiC whisker=100:15 by mass percentage to prepare premixed powder. The binder adopts polycarbosilyl multi-component binder, and the weight percentage of each component is PCS:PW:HDPE:SA=50:40:5:5. The binder was mixed on a mixer at 130° C. for 1.5 hours and then mixed with the premixed powder on a mixer at 120° C. for 2 hours, with a powder loading of 58% by volume. After granulation, injection molding is performed on an injection machine, the injection temperature is 150°C, the injection pressure is 100MPa, and the mold temperature is 30°C. Heat the obtained SiCw / SiC composite part forming body in a thermal degreasing furnace under the protection of hydrogen to 200°C for 0.5 hours, then raise the temperature to 380°C for 0.5 hours, and continue to heat up to 500°C for 1 hour to completely remove the bond agent. Continue to raise the temperature of the degreased parts to 9...

Embodiment 3

[0021] The SiC micropowder and SiC whisker are uniformly mixed according to the ratio of SiC micropowder:SiC whisker=100:15 by mass percentage to prepare premixed powder. The binder adopts polycarbosilyl multi-component binder, and the weight percentage of each component is PCS:PW:HDPE:SA=60:30:10:0. The binder was mixed on a mixer at 130° C. for 1.5 hours and then mixed with the premixed powder on a mixer at 130° C. for 2 hours, with a powder loading of 58% by volume. After granulation, injection molding is performed on an injection machine, the injection temperature is 150°C, the injection pressure is 110MPa, and the mold temperature is 30°C. Heat the obtained SiCw / SiC composite part blank in a thermal degreasing furnace under the protection of hydrogen to 200°C for 0.5 hours, then raise the temperature to 420°C for 0.5 hour, continue to heat up to 520°C for 1 hour to completely remove the bond agent. Continue to raise the temperature of the degreased part forming body to ...

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Abstract

A producing method for enhanced silicon carbide compound material parts by the silicon carbide whisker belongs to the preparation techical field of ceramic substrate compound material and parts thereof. The SiCw / SiC compound material parts are produced by a combined art of powder injecting molding and precursor transformation. An even feed is obtained by mixing the SiC micro powder and SiC whisker and prepared binder in a certain proportion. The feed is injecting molding in the injecting molding machine by die after pelletization and obtaining a molding base of SiCw / SiC compound material part with needed shape. The molding base of SiCw / SiC compound material part is pre-sintered in 1300-1500 DEG C after thermally degreasing, finally sintered to densification in the sintering kiln. The advantages of the invention is: reducing the application amount of the powder injecting molding SiC ceramic binder, increasing the parts capacity and size accuracy and production efficiency, achieving the complicated SiCw / SiC compound material parts of near-final, low cost and mass production.

Description

technical field [0001] The invention belongs to the technical field of preparation of ceramic matrix composite materials and parts thereof, and in particular provides a method for preparing near-net-shaped silicon carbide whisker reinforced silicon carbide (SiCw / SiC) composite parts, realizing low-cost, high-efficiency Preparation of performance ceramic matrix composite parts. Background technique [0002] With the rapid development of modern defense, nuclear energy and aerospace technology, as well as petrochemical industry and ocean engineering, etc., the lining of rocket combustion chambers, aircraft turbine engine blades, nuclear reactor structural components, high-speed pneumatic bearings, mechanical seal parts, lightweight satellite reflectors, etc. Key materials have put forward higher and higher requirements, and there is an urgent need to develop various new high-performance materials. Silicon carbide (SiC), silicon nitride (Si 3 N 4 ) and other advanced ceramics...

Claims

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Application Information

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IPC IPC(8): C04B35/565C04B35/81C04B41/91
Inventor 何新波曲选辉张勇任淑彬段柏华秦明礼汤春峰
Owner UNIV OF SCI & TECH BEIJING
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