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Ti-Ni钎料钎焊连接ZrC—SiC复合陶瓷接头的界面组织

ISSN号：0454-5648
期刊名称：《硅酸盐学报》
时间：0
分类：TG454[金属学及工艺—焊接]
作者机构：[1]先进焊接与连接国家重点实验室,哈尔滨150001, [2]哈尔滨工业大学材料科学与工程学院,哈尔滨150001
相关基金：国家自然科学基金（50975062,51275135,51021002）资助项目.

关键词：碳化锆, 碳化硅, 复合陶瓷, 钎焊, 抗剪强度, zirconium carbide, silicon carbide, composite ceramic, brazing, shear strength

中文摘要：

采用 Ti–Ni 高温钎料对 ZrC–20% （体积分数） SiC 复合陶瓷进行了钎焊连接，研究了钎料中 Ni 的含量对界面微观组织以及钎焊接头力学性能的影响，通过调节钎料成分实现了对界面反应速率的控制。结果表明：Ti–83% （摩尔分数） Ni 共晶钎料钎焊 ZrC–SiC 时，界面发生剧烈反应并形成约50 μm 厚的过渡层，反应产物主要为 Ni2Si 以及 C；当采用 Ti–61%Ni 共晶钎料钎焊 ZrC–SiC 时，Ni 首先与 SiC 发生反应，其反应产物 C 与 Ti 继续反应生成 TiC；随钎料中 Ni 含量降低，以及 TiC 化合物对 Ni 原子扩散的阻碍作用导致界面反应速率下降，反应层厚度为 10～15μm。当钎料中 Ni 含量降至 50%时，界面形成了单一 TiC 层，厚度约为 5μm。在 3 种钎焊接头中，采用 Ti–61%Ni 共晶钎料的钎焊接头界面组织从陶瓷到钎缝均匀过渡，其抗剪强度达到 127MPa。

英文摘要：

ZrC-20% （volume fraction） SiC（ZS） composite ceramic was brazed with a Ti-Ni high melting point filler metal. The effect of change in filler metal composition on the interface microstructure and mechanical property was investigated. At last, the interfacial reaction rate was controlled via the change of the filler metal composition. The effect of Ni content in filler metal on the interface microstructure and mechanical property was investigated. The results showed that the interfacial reaction was violent when ZS was brazed with Ti-83% （mole fraction） Ni filler metal, and a transition layer of 50μm was formed. In this transition layer, some reactions occurred in Ni-SiC system and the reacted products were Ni2Si and C. When the content of Ni in Ti-Ni filler metal decreased to 61%, Ni reacted firstly with SiC. Also, Ti reacted with the reaction product C, and a large amount of TiC formed in the transition layer as well as the interface. The formed TiC hindered the transport of Ni atoms to the ZS composite ceramic, thus causing the reduction of the interfacial reaction. In this condition, the thickness of the transition layer decreased to 10-15 pro. Furthermore, only TiC formed on the interface when brazed with Ti-50%Ni filler metal. The thickness of TiC layer was 5 μm. The shear strength of the joint brazed with Ti--61%Ni filler metal reached 127 MPa, which was the maximum value for its relative uniform microstructure on the interface.