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Study on diffusion brazing process for titanium alloy sandwich structure(PDF)

《火箭推进》[ISSN:1672-9374/CN:CN 61-1436/V]

Issue:
2018年01期
Page:
67-74
Research Field:
工艺与材料
Publishing date:

Info

Title:
Study on diffusion brazing process for titanium alloy sandwich structure
Author(s):
ZHAO Ding1; LIU Lin2; SUN Longfei2
1.Department of Aerospace, Northwestern Polytechnical University, Xi'an 710072, China; 2.Xi'an Space Engine Company Limited, Xi'an 710100, China
Keywords:
TC4 titanium alloy;  sandwich structure;  numeral simulation;  diffusion brazing
PACS:
V463-34
DOI:
-
Abstract:
The Cu interlayer concentration distribution law near TC4 titanium alloy diffusion brazing interface was simulated by using dynamic software Dictra.The influence trend of the interlayer thickness, bonding temperature and temperature holding time on the diffusion distance of interlayer was obtained, which provided a theoretical basis for the design of process parameters.The correctness of the diffusion analog computation was verified in combination with welding experiment of sandwich structure parts.The results show that the bonding temperature has the greatest influence on the joint strength of titanium alloy sandwich structure diffusion brazing, and then the holding time follows but the interlayer thickness has no influence on the joint strength.For the titanium sandwich structure, the microstructure analysis result of welded joints reveals that the appropriate process of the diffusion brazing should be bonding temperature of 940 ℃, holding time of 50 min and the interlayer thickness of 20μm, which meets the requirements of product.

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