Joining of SiC_p/Al composites by insert powder layers

作     者：黄继华 董月铃 万云 张建纲 周国安 

作者机构：School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China 

出 版 物：《中国有色金属学会会刊：英文版》 (Transactions of Nonferrous Metals Society of China)

年 卷 期：2005年第15卷第5期

页      面：1067-1071页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：Project(50175004)supportedbytheNationalNaturalScienceFoundationofChina 

主　　题：铝 硅 焊接工艺 复合材料 粉末层插入法 亚共晶 

摘      要：Mixed Al-Si, Al-Si-SiC and Al-Si-W powders were employed as insert layers to reactive diffusion bond SiC_p/6063 MMC. The results show that SiC_p/6063 MMC joints bonded by the insert layer of the mixed Al-Si powder have a dense joining layer with a typical hypoeutectic microstructure. Using mixed Al-Si-SiC powder as insert layer, SiC_p/6063 MMC can be reactive diffusion bonded by a composite joint. Because of the SiC segregations, however, there are a number of porous zones in the joining layer, which results in the low shear strength of the joints, even lower than that of joints reactive diffusion bonded by the insert layer of mixed Al-Si powder. The W added into the insert layer of Al-Si-W nearly all reacts with Al to form intermetallic WAl_ 12 during bonding. The reaction between the W and Al facilitates to form a dense joint of high quality, and the formed intermetallic WAl_ 12 has a reinforcing effect on the joints, which lead to the high shear strength of the joints. In general, under the condition of fixed bonding time (temperature), the shear strengths of the joints increase as the bonding temperature (time) increases, but tend to a maximum at bonding temperature of 600℃(time 90min).