Influence of fabricating process on
microstructure and properties of spheroidal cast tungsten carbide powder
microstructure and properties of spheroidal cast tungsten carbide powder
(1. State Key Laboratory of Powder Metallurgy, Central South University,
Changsha 410083, China;
2. Hunan Denli New Materials Engineering Center Co Ltd, Changsha 410083, China)
Changsha 410083, China;
2. Hunan Denli New Materials Engineering Center Co Ltd, Changsha 410083, China)
Abstract: A super-high temperature furnace was developed to fabricate spheroidal cast tungsten carbide powder with excellent flowability and fine feathery structure in a large scale. Optical microscope and scanning electron microscope were taken to characterize the morphology and microstructure of cast tungsten carbide powder. X-ray diffractometry was used to analyze the phase composition of powders involved. It is found that the carbon potential in the furnace and feeding speed play an important role on the microstructure, morphology and properties of the spheroidal cast tungsten carbide powder. As carbon potential is between 0.3% and 0.9% in the furnace, cast tungsten carbide powder with hardness over 2800(HV0.5), flowability over 7.1s/50g and tap density over 10.3g/cm3 is obtained.
Key words: spheroidal cast tungsten carbide; fine feathery structure; processing parameter; flowability