Microstructures and mechanical properties of Cf/SiC composite and TC4 alloy joints brazed with (Ti-Zr-Cu-Ni) plus W composite filler materials
Microstructures and mechanical properties of Cf/SiC composite and TC4 alloy joints brazed with (Ti-Zr-Cu-Ni) plus W composite filler materials
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DOI：
10.1016/j.compscitech.2014.03.021
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发表时间：
2014-06-16
影响因子：
9.1
通讯作者：
Zhao, Xingke
中科院分区：
文献类型：
--
作者：
Cui, Bing;Huang, Jihua;Zhao, Xingke
采用（Ti-Zr-CuNi）+W混合粉末作为复合填料，在合适的工艺参数下，将碳纤维增强SiC（C-f/SiC）复合材料与TC 4合金进行连接。利用扫描电镜（SEM）、能谱仪（EDS）和X射线衍射仪（XRD）研究了C-f/SiC复合材料/（Ti-Zr-Cu-Ni）+W/TC 4合金接头的界面组织及其演变机制。利用力学试验机测试了钎焊接头的力学性能。结果表明，中间层中的Ti、Zr元素与钎料发生反应，钎焊接头主要由Ti 3SiC 2、Ti 5Si 3、（Ti，Zr）C、Ti 2Cu、Cu 10 Zr 7、Ti（Cu，Ni）和Ti（s，s）反应产物组成。中间层与TC 4合金之间由于元素的相互扩散而形成扩散反应层。钎焊工艺参数对C-f/SiC复合材料与钎料之间的界面反应有显著影响，从而影响钎焊接头的剪切强度。添加适量的W粉有利于缓解钎焊接头的残余热应力，增强钎焊接头的强度。钎焊接头的最大剪切强度在室温下为166 MPa，在800 ℃高温下为96 MPa，在930 ℃下使用（Ti-Zr-Cu-Ni）+15 vol. % W复合填充材料。(C)2014爱思唯尔有限公司版权所有。
In this study, carbon fiber reinforced SiC (C-f/SiC) composite was joined to TC4 alloy using (Ti-Zr-CuNi)+W mixed powders as composite filler material at proper process parameters. The interfacial microstructures and evolution mechanism of C-f/SiC composite/(Ti-Zr-Cu-Ni)+W/TC4 alloy joints were investigated based on scanning electron microscopy (SEM), energy dispersive spectrometry (EDS) and X-ray diffraction (XRD). The mechanical properties of the brazed joints were measured by the mechanical testing machine. The results showed that Ti and Zr elements in the interlayer can react with the brazed material, the brazed joint mainly consisted of Ti3SiC2, Ti5Si3, (Ti, Zr)C, Ti2Cu, Cu10Zr7, Ti(Cu, Ni) and Ti(s,s) reaction products. The diffusion-reaction layer was formed between the interlayer and TC4 alloy due to the element interdiffusion. The brazing parameters had a distinct effect on the interfacial reaction between C-f/SiC composite and filler material, which affected the shear strength of the brazed joints. Adding the appropriate W powder was beneficial for relaxing the residual thermal stress and reinforcing the brazed joints. The maximum shear strength of the brazed joints was 166 MPa at room temperature and 96 MPa at 800 degrees C high temperature acquired at 930 degrees C for 20 min using (Ti-Zr-Cu-Ni)+15 vol.%W composite filler material. (C) 2014 Elsevier Ltd. All rights reserved.