Effect of dewaxing process on carbon and oxygen content in ultra-fine pre-alloyed matrix

In order to improve the fluidity and cold pressure performance of superfine pre-alloyed powder, granulating agent should be added to the granulation of superfine pre-alloyed powder, and then the granulating agent is removed by reduction dewaxing process and heat preservation dewaxing process. The results show that no matter which dewaxing process after granulation, there will be granulating agent residues in the matrix after sintering, which will increase the carbon content.The mass fraction of carbon and oxygen in the matrix is the lowest in the reduction dewaxing process, which are 0.048% and 0.22% respectively, but the carbon content in the furnace preservation heat dewaxing process can also reach the level of the reduction dewaxing process by increasing the heat preservation time.In the process of heat preservation and dewaxing of the furnace, the oxygen content of the sample does not decrease with the increasing of the holding time. It is only related to the sintering condition. The reduction atmosphere in the graphite mold at high temperature makes the oxygen content of the sample lower.The two kinds of dewaxing methods have little effect on the flexural strength and Rockwell hardness of the superfine FeCoCu pre-alloyed powder matrix.