鍍鎳與鍍銅對SiCp/6063Al復合材料真空釬焊接頭剪切強度的影響
Effects of Copper Plating and Nickel Plating on Shear Strength of Vacuum Brazed Joints of SiCp/6063Al Composites
采用表面金屬化工藝在60%SiCp/6063Al復合材料表面制備鍍銅層和鍍鎳層, 然后對表面金屬化處理前的復合材料進行真空加壓釬焊, 研究了鍍鎳和鍍銅對復合材料釬焊接頭剪切強度的影響。結(jié)果表明: 復合材料表面鍍層均與基體緊密結(jié)合; 在570 ℃的釬焊溫度下, 隨著保溫時間延長, 釬焊接頭的剪切強度逐步增大; 與表面鍍鎳及未渡金屬的相比, 表面鍍銅復合材料接頭的剪切強度更高, 接頭的剪切強度最高可達55.4 MPa, 且其剪切斷裂發(fā)生在釬料層和復合材料內(nèi)部; 鍍鎳會降低接頭的剪切強度。
Using surface alloying technique, copper layer and nickel layer were deposited on the SiCp/6063Al composites with 60% volume fraction of SiC. Then, SiCp/6063Al composites before and after surface alloying were vacuum brazed respectively. The effects of copper layer and nickel layer on the shear strength of the brazed joints were studied. The results indicate that the two plating layers combined with base metal compactly. As prolonging the heat preservation time, the shear strength of the brazed joints rose synchronously at 570℃. The brazed joint of the composite with copper plating on surface had higher shear strength than that with nickel plating, and the top value hit 55.4 MPa. The shear fracture occurred on the inside of composites and in the brazing filler metal. Nickel plating decreased the shear strength of the joint.