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Method for assisting brazing of Cf/SiC composite material and metal through surface honeycomb modification

A composite material and surface honeycomb technology, applied in auxiliary devices, metal processing equipment, welding equipment, etc., can solve the problems of complex process, high cost of mechanical drilling, difficult practical application, etc., achieve simple process method, improve mechanical properties and Reliability, the effect of increasing the interface contact area

Pending Publication Date: 2021-06-18
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In summary, C f / SiC composite surface modification can effectively improve the C f / SiC composite material and the strength of the interface between the connecting layer, so that the mechanical properties of the joint are greatly improved, but the cost of laser roughening and mechanical drilling is high, the process is complicated, and it is difficult for practical application

Method used

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  • Method for assisting brazing of Cf/SiC composite material and metal through surface honeycomb modification
  • Method for assisting brazing of Cf/SiC composite material and metal through surface honeycomb modification
  • Method for assisting brazing of Cf/SiC composite material and metal through surface honeycomb modification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1) Using wire cutting will C f / SiC composite and stainless steel processing into 5 × 5 × 5mm 3 And 10 × 10 × 3mm 3 Quartz block, then will C f / SiC composite surface is ground to remove inclusions by 600 mesh sandpaper, and the stainless steel surface is polished by 240 mesh sandpaper to remove the oxide film, and then the Ceracein Ca f / SiC composites and stainless steel are placed in anhydrous ethanol for 5 to 10 min;

[0038] 2) Waiting to be heated to 700 ° C, will clean C f The / SiC composite is placed in a muffle furnace for 5 minutes, forming a honeycomb-like-bearing surface having a dense pore, and then ultrasonic cleaning after oxidation.

[0039] 3) The oxidation after C f / SiC composite, Agcuti solder and stainless steel are equipped with "sandwiches" surrounded by "sandwiches" to be placed in a vacuum brazing furnace, when the vacuum is better than 5 × 10 -3 When PA is powered, the control temperature rate is 15 ° C / min, the heat preservation temperature...

Embodiment 2

[0043] In the present embodiment, in fact, in Example 1 is C f / SiC composites are oxidized in a muffle furnace 7.5 min, and the remaining process conditions and implementation steps are identical to Example 1.

Embodiment 3

[0045] In the present embodiment, in fact, in Example 1 is C f The / SiC composite is oxidized in a muffle furnace for 10 min, and the remaining process conditions and implementation steps are identical to Example 1.

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Abstract

The invention provides a method for assisting brazing of a Cf / SiC composite material and metal through surface honeycomb modification, and relates to the technical field of dissimilar material connection. The process method is simple, the cost is low, the adaptability is high, and the mechanical property and the reliability of a joint of the Cf / SiC composite material and the metal can be effectively improved. The method comprises the steps that S1, to-be-welded surfaces of the Cf / SiC composite material and the metal are pretreated; S2, the pretreated Cf / SiC composite material is heated and oxidized, so that carbon fibers on the surface of the Cf / SiC composite material are oxidized and decomposed, and the surface honeycomb modified Cf / SiC composite material is obtained; and S3, the Cf / SiC composite material subjected to surface honeycomb modification, brazing filler metal and metal are assembled into a to-be-welded part, heating welding is conducted in a vacuum state, the brazed joint of the Cf / SiC composite material and the metal is obtained, and welding is completed. The technical scheme provided by the method is suitable for the process of connecting the Cf / SiC composite material and the metal.

Description

Technical field [0001] The present invention relates to the field of dissimilar material connection, in particular, to a surface honeycomb modified auxiliary brazing C. f / SiC composites and metals. Background technique [0002] C f / SiC composites have the advantages of low density, small coefficient of thermal expansion, high temperature resistance, ablation resistance, high shock resistance, high elastic modulus, have a wide range of application prospects in high temperature fields such as aerospace engine, rocket thrust room. However, in actual applications, C f / SiC composites tend to be connected to metals. Used to connect C f / SiC composites and metals are attached to active brazing, diffusion welding, mechanical connection, and bonding. Among them, the active brazing is simple in connection with the connection method, the application is high, and there is no need to apply pressure, and the sealing property is good. f / SiC composite and metal widely used connection te...

Claims

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Application Information

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IPC IPC(8): B23K1/008B23K1/19B23K1/20B23K3/08
CPCB23K1/008B23K1/19B23K1/20B23K1/203B23K1/206B23K3/08B23K3/082
Inventor 黄继华王永雷王万里叶政杨健陈树海赵兴科
Owner UNIV OF SCI & TECH BEIJING