METHOD OF MANUFACTURING TUNGSTEN COATED COPPER COMPOSITE POWDER AND APPLICATION THEREOF

摘要

PURPOSE: A tungsten-copper composite powder without production of intermediate such as CuWO4, a manufacturing method of tungsten coated tungsten-copper composite powder by introducing three-step reduction heat treatment, and an application of the tungsten coated tungsten-copper composite powder as powder injection molding purposes are provided. CONSTITUTION: The method comprises the steps of mixing and pulverizing tungsten oxide (WO3 or WO2.9) powder and cooper oxide (CuO or Cu2O) powder by tubular mixing or ball milling; and reducing the mixed and pulverized oxide powder in a hydrogen atmosphere or hydrogen contained reduction gas atmosphere, wherein tungsten and copper are mixed in a weight ratio of 10:90 to 90:10 in the tungsten-copper composite powder, wherein the tubular mixing or ball milling is performed for 1 minute to 50 hours, and wherein the reduction heat treatment step comprises the process of cooling the resulting oxide powder after holding the mixed and pulverized oxide powder in the temperature range of 200 to 400 deg.C for 1 minute to 5 hours, increasing temperature of the oxide powder so that the oxide powder is held in the temperature range of 500 to 700 deg.C for 1 minute to 5 hours, and again increasing temperature of the oxide powder so that the oxide powder is held in the temperature range of 750 to 1,080 deg.C for 1 minute to 5 hours.