Microstructure evolution and its effect on the mechanical properties of the ZrC–SiC composite joint diffusion bonded with pure Ni foil
Microstructure evolution and its effect on the mechanical properties of the ZrC–SiC composite joint diffusion bonded with pure Ni foil
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DOI：
10.1016/j.ceramint.2013.04.074
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发表时间：
2014
影响因子：
5.2
通讯作者：
C. Song;Tiesong Lin;P. He;Weiqi Yang;D. Jia;Jicai Feng
中科院分区：
文献类型：
--
作者：
C. Song;Tiesong Lin;P. He;Weiqi Yang;D. Jia;Jicai Feng
采用纯Ni箔作为中间层，对ZrC-20vol%SiC复合材料进行扩散连接。研究了界面组织的演变及其对接头力学性能的影响。结果表明，Ni优先与SiC反应。相应的反应产物为Ni_2Si和C。在较长的保温时间或较高的连接温度下，反应产物Ni 2Si从C中分离出来，并沿沿着ZrC晶界渗透。与此同时，C变成了石墨片。在ZrC/Ni界面附近，由于ZrC与Ni之间的轻微反应，形成了镍基固溶体和细小的石墨。随着连接温度的升高，Ni逐渐消耗，过渡层厚度增加。在800 °C ~ 1200 °C范围内，接头的剪切强度随连接温度的升高先增大后减小。在1000 °C、20 MPa、30 min条件下，接头强度达到最大值168 MPa。
The ZrC—20 vol% SiC composite was diffusion bonded with pure Ni foil as the interlayer. The interfacial microstructure evolution and its effect on the mechanical property of the joint were investigated. The results showed that Ni reacted preferentially with SiC. The corresponding reaction products were Ni2Si and C. During longer holding time or at higher joining temperature, the reaction product Ni2Si separated from C and penetrated along ZrC boundaries. Meanwhile, C transformed into pieces of graphite. Beside the ZrC/Ni interface, nickel based solid solution and fine graphite were observed due to the slight reaction between ZrC and Ni. With increasing in joining temperature, Ni was consumed gradually and the transition layer increased in thickness. The shear strength of the joints increased to the maximum and then decreased with increasing joining temperature from 800 °C to 1200 °C. The maximal value of 168 MPa was obtained when joined at 1000 °C under 20 MPa for 30 min.