Densification of iron-based powder during warm compaction process

The warm compaction behavior of iron-based powder in different conditions with the resistance type powder warm compaction system was studied. The relationship between heating temperature and liquidity of Fe-based powders, heating methods and density of products, mold temperature and compact hardness during warm compaction process were analyzed. The results show that the Fe-based powders can maximize the density of powder compacts at appropriate temperature and pressure. The powders have lower ejection forces and larger hardness of compacts when the power temperature is in the range of (85±5)°C, mold wall temperature is 135°C (inner wall temperature is 115°C), the compaction pressure is between 700 and 750 MPa, which is the best powder warm compaction process parameters, and that the powder lubricant in the compacting process can effectively reduce friction among powders as well as powders and molds, increase the actual effect of the force acting on the powder and effectively improve the degree of densification of the powder product.