【摘要】 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,研究了共晶钎料对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.更多还原

【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 0.2mm,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.更多还原