Preparation of Ti-Si Eutectic Brazes and its Weldability to SiC

doi:10.3724/SP.J.1077.2009.00204

Abstract

Abstract: 91.5Ti-8.5Si (wt%) and 22Ti-78Si(wt%) eutectic brazes with fine structure were prepared by means of the non-consumable arc-melting technology. Wetting behavior and interfacial reactions of two kinds of brazes on silicon carbide (SiC) were investigated by using the sessile drop method in vacuum at 1400℃ for 10min. The results indicate that two kinds of the brazes exhibit good wettability to SiC ceramic, and their contact angles are about 10°and 25°, respectively. After wetting, separation occurs between 91.5Ti-8.5Si (wt%) and SiC, but adhesion is good between 22Ti-78Si (wt%) and SiC. At wetting temperature system, bending strength of the joint of SiC/22Ti-78Si (wt%) /SiC with the braze thickness of 0.2mm, may reach 72MPa by tentative joining. Microstructure, phase composition and melting temperature of two kinds of the brazes and the interface of the brazes / SiC are examined by SEM, EDS, XRD and DSC, etc. Relationship between wettability of the brazes on SiC ceramic and interfacial reactions are investigated.

Key words: eutectic brazes, SiC ceramic, wettability, interfacial reactions, microstructure

CLC Number:

TQ174

LI Jia-Ke,LIU Lei,LIU Yi-Chun,ZHANG Wen-Long,HU Wen-Bin. Preparation of Ti-Si Eutectic Brazes and its Weldability to SiC[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2009.00204.

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Preparation of Ti-Si Eutectic Brazes and its Weldability to SiC

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