C/C复合材料与镍基高温合金连接接头的力学性能和微观结构

Mechanical Properties and Microstructure of the Joints between Carbon-Carbon Composites and Ni Based High Temperature Alloys

采用Ni、Si粉末作中间层连接材料,利用真空热压工艺成功制备C/C复合材料与镍基高温合金(GH3128)的连接样件。并借助X射线衍射仪、扫描电子显微镜和材料万能试验机,研究连接温度对其连接接头力学性能和微观结构的影响规律。结果表明,随着连接温度的升高,不仅接头中间层的元素分布更加均匀,而且接头的剪切强度也随之明显增大。当连接温度为1160℃时,连接接头的剪切强度可达12.6MPa。

Joining samples of carbon/carbon composites （C/C composites） and Ni based high temperature alloy （GH3128） were fabricated by vacuum hot pressing joining process with the powder of Ni and Si as the interlayer material. The effects of the joining temperature on the mechanical properties and microstructure of the joints between C/C composite and GH3128 were investigated by X-ray diffraction devices, scanning electron microscopes and universal material testing machines. The results show that with the joining temperature rising, not only does the element distribution in the joints become more uniform, but also the shear strength of the joining samples increases. When the joining temperature is 1160 ？C, the shear strength of the joining samples reaches up to 12.6 MPa.