MANUFACTURE OF METALLIC WIRE HAVING HIGH MELTING POINT

摘要

PURPOSE:To inhibit defects such as surface cracking during electropolishing and to improve the yield of products by heat treating a wire rod at a prescribed temp. between drawing and electropolishing stages to make the work strain uniform. CONSTITUTION:A sintered body of tungsten (alloy) is swaged and drawn to form a wire rod of >=0.2mm.phi diameter. This wire rod is annealed by heat treatment at 900-1,000 deg.C to make the work strain present in the wire rod uniform. The wire rod is then electropolished to remove a black layer sticking to the surface of the wire rod.