Joining of C_f/SiC composite to GH783 superalloy with NiPdPtAu-Cr filler alloy and a Mo interlayer

作     者：Wen-Wen Li Bo Chen Hua-Ping Xiong Wen-Jiang Zou Hai-Shui Ren 

作者机构：Welding and Plastic Forming Division Beijing Institute of Aeronautical Materials 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2019年第35卷第9期

页      面：2099-2106页

核心收录：

学科分类：0806[工学-冶金工程] 0817[工学-化学工程与技术] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0802[工学-机械工程] 0702[理学-物理学] 0801[工学-力学（可授工学、理学学位）] 

基　　金：sponsored by the National Natural Science Foundation of China (Grant Nos. 59905022, 50475160 and 51275497) Aeronautical Science Foundation of China (Grant No. 2008 ZE21005) 

主　　题：Cf/Si Ccomposite GH783 superalloy Microstructure Strength Fracture mechanism 

摘      要：With assistance of Mo interlayer, joining of Cf/SiC composite to GH783 superalloy was carried out using NiPdPtAu-Cr filler alloy. Under the brazing condition of 1200 C for 10 min, the maximum joint strength of 98.5 MPa at room temperature was achieved when the thickness of Mo interlayer was 0.5 mm. Furthermore, the corresponding joint strength tested at 800 ℃ and 900℃ was even elevated to 123.8 MPa and 133.0 MPa, respectively. On one hand, the good high-temperature joint strength was mainly attributed to the formation of the refractory Mo-Ni-Si ternary compound within the joint. On the other hand, the residual Mo interlayer as a hard buffer, can release the residual thermal stresses within the dissimilar joint. The Cf/SiC-Mo bonding interface was still the weak link over the whole joint, and the cracks propagated throughout the whole reaction zone between the Cf/SiC composite and the Mo interlayer.