SINTERING METHOD FOR SUPPRESSING EXUDING OF COPPER FROM W-Cu COMPOSITE MATERIAL

摘要

PURPOSE: A method for densifying the W-Cu composite material as suppressing exuding of copper from the W-Cu composite material when performing densification process of W-Cu composite material by liquid phase sintering is provided. CONSTITUTION: The sintering method for suppressing exuding of copper from W-Cu composite material comprises a step of maintaining a W-Cu composite material prepared by press forming W-Cu composite powder in the copper solidification temperature range of 800 to 1,083 (except 1,083 deg.C) at a reducing gas atmosphere for 0.5 to 10 hours; and a step of cooling the temperature increased W-Cu composite material right after increasing temperature of the W-Cu composite material to 1,200 to 1,400 deg.C, wherein the W-Cu composite powder is prepared by reduction heat treating the milled mixed powder in a hydrogen atmosphere after mixing tungsten (WO3 and WO2.9) powder with copper oxide (CuO and Cu2O) powder and milling the mixed powder, and the W-Cu composite powder is a globular powder having a certain size formed in such a shape that W powder surrounds Cu powder. The sintering method for suppressing exuding of copper from W-Cu composite material comprises a step of maintaining a W-Cu composite material prepared by press forming W-Cu composite powder in the temperature range of 1,083 to 1,150 that is right above a copper melting point at a reducing gas atmosphere for 0.5 to 10 hours; and a step of cooling the temperature increased W-Cu composite material right after increasing temperature of the W-Cu composite material to 1,200 to 1,400 deg.C.