Connecting method for Cf/SiC composite material and titanium alloy

A composite material and connection method technology, which is applied in the field of heterogeneous material connection, can solve the problems of complex connection process, low joint strength, poor high temperature performance, etc., and achieve simple process, increase room temperature and high temperature strength, and improve high temperature performance. Effect

Inactive Publication Date: 2009-06-24
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

[0006] The purpose of the present invention is to overcome current C f / SiC composite material connection technology has many problems such as high connection temperature, complicated connection process, low joint strength and poor high temperature performance.

Method used

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  • Connecting method for Cf/SiC composite material and titanium alloy
  • Connecting method for Cf/SiC composite material and titanium alloy
  • Connecting method for Cf/SiC composite material and titanium alloy

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Experimental program
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Embodiment Construction

[0019] The specific test implementation steps are as follows:

[0020] 1.C f / SiC ceramic matrix composite material density is 2.0~2.1g / cm 3 , the porosity is 10% to 15%, the fiber bundle is 3K, the fiber volume accounts for 45% to 50%, the bending strength at room temperature is about 400MPa, and it is cut into squares of 6×5×4mm. The titanium alloy (TC4) component is Ti-6AI-4V (wt%), and the titanium alloy is a rod shape of φ15, which is cut into a 5mm thick cylinder;

[0021]2. The raw material Cu powder particle size is about 250 mesh, Ti powder particle size is about 400 mesh, C powder is colloidal graphite powder, the average particle size is 7μm, and the moisture content is lower than 0.5wt%;

[0022] 3.C f / SiC composite material to be welded with 400-grit sandpaper to remove surface debris, and then cleaned with acetone, titanium alloy to be welded with 60-grit sandpaper to remove the surface oxide layer, and then cleaned with acetone. Put the soldering material i...

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Abstract

A connection method of a Cf / SiC composite material and a titanium alloy belongs to the technical field of dissimilar material connection. The method comprises the following steps: Cu, Ti and graphite powder are evenly mixed at certain proportion and prepared to a pasty solder with alcohol, the prepared pasty solder is spread between the materials to be soldered to solder the Cf / SiC ceramic-based composite material with the titanium alloy in vacuum without applying pressure. A reaction in situ occurs in a connection layer to produce a high-melting-point TiC wild phase in soldering and form a composite connection layer which is similar to a particle reinforced metal-based composite material, thus reducing the thermal expansion coefficient of the whole connection layer, relieving thermal stress of a joint and significantly improving the strength of the joint at room temperature and high temperature. The connection method has the advantages of simple process, easy preparation of connection materials, low cost, low soldering temperature, good joint performance and the like.

Description

technical field [0001] The invention belongs to the technical field of connection of heterogeneous materials, and in particular provides a method for synthesizing a reinforcement phase by in-situ reaction of a connection layer during the connection process to obtain a connection layer similar to particle-reinforced metal-based composite materials. Background technique [0002] The engine is the core component of the space vehicle, and plays a very important role in the entire field of space technology. In recent years, with the advancement of aerospace technology at home and abroad, engine technology has also been developing in the direction of high reliability, large thrust-to-weight ratio, and high sensitivity. The application of ceramics and ceramic matrix composites in engines makes it possible to develop new high-performance engines. Carbon fiber reinforced silicon carbide ceramic matrix composites (C f / SiC composite material) fully combines the advantages of carbon ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B37/02
Inventor 黄继华熊进辉薛行雁张华赵兴科田亮
Owner UNIV OF SCI & TECH BEIJING
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