Process for the production of cobalt powder cutting tool and obtained cobalt powder

摘要

A process for the production of powdered metallic cobalt by reduction of cobaltous ammonium sulphate solutions. A soluble silver salt, preferably silver sulphate, is added in an amount to provide a soluble silver to cobalt weight ratio in the range of 1 to 10 g silver:1 kg cobalt, an organic dispersant such as bone glue or polyacrylic acid, or mixture thereof, is added in an amount of 0.01. to 2.5% of the weight of the cobalt, an ammonia to cobalt mole ratio of about 1.5:1 to 3.0:1 is established, and the solution is heated to a temperature in the range of 150 to 250 DEG C., preferably about 175 DEG C., with agitation under a hydrogen pressure of 2500 to 5000 kPa for a time sufficient to reduce the cobaltous sulphate to cobalt metal powder.