Study on Vacuum Melting and Casting of Tungsten and Copper with Dovetail Groove Structure

In order to obtain high quality W/CuCrZr composites, the W/CuCrZr composite plates with dovetail groove structure were fabricated by vacuum melting and casting. The microstructure characteristics and mechanical properties of W/CuCrZr joining interface were systematically analyzed by optical microscope, scanning electron microscope coupled with EDS analysis, hardness tester and other equipment. The results show that the joining interface of W/CuCrZr composite prepared by melting and casting under vacuum conditions of 10(-4) Pa and heating temperature of 1100-1200. presents flat and straight structure. The W and CuCrZr are tightly bonded at the interface without obvious defects. At the joining interface, the phenomenon of elemental interdiffusion occurs, there by forming a banded melting diffusion layer with the width of 6-8 mu m. The Vickers hardness on the tungsten side of the W/CuCrZr composite plate is improved compared with that of the base material, where as that on CuCrZr side is lower than that of the base metal.