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재활용 APT를 이용한 WO<sub>3</sub> 제조와 WC-Co 의 용사코팅
정준기,김성진,온진호,문흥수,피재환,하태권,박상엽,Chung, J. K.,Kim, S. J.,On, J. H.,Moon, H. S.,Pee, J. H.,Ha, T. K.,Park, S. Y. 한국소성가공학회 2015 소성가공 : 한국소성가공학회지 Vol.24 No.4
The possibility of chemical precipitation for recycled ammonium paratungstate (APT) was studied. WO<sub>3</sub> particles were synthesized by chemical precipitation method using a 1:2 weight ratio of APT:DI-water. At the 500℃ sintering temperature, the X-ray diffraction results showed that APT completely decomposed to WO<sub>3</sub>. For the granulated powder WC-Co, vacuum heat treatment at proper temperatures increases tap density and flow-ability. Hardness of the WC-Co thermal spray coating layer was measured in the range HV 831~1266. Spray conditions for the best characteristic values were an oxygen flow rate=1500 scfh, a fuel flow rate = 5.25gph and a gun distance = 320mm.