采用海绵钛和单晶硅为原料，通过非自耗电弧熔融技术制备91.5Ti-8.5Si(wt%)和22Ti-78Si(wt%)共晶钎料.在真空中1400℃×10min条件下，研究了共钎料对SiC陶瓷的润湿性能和界面反应.结果表明：两种共晶钎料对SiC陶瓷均具有良好的润湿性能，润湿角分别约为10和25.在润湿实验后，91.5Ti-8.5Si(wt%)钎料和SiC陶瓷分离，22Ti-78Si (wt%)钎料和SiC陶瓷之间结合紧密.在润湿实验的温度制度下，用22Ti-78Si (wt%)钎料（厚度为0.2mm）对SiC陶瓷进行了初步连接，接头的抗弯强度为72MPa.采用SEM、EDS、XRD等检测手段对钎料的形貌和物相组成、钎料和SiC陶瓷的界面结合情况进行了表征，揭示了钎料对SiC陶瓷润湿性和界面反应的机理.
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 0.2mm, 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.
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