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기상응축법으로 제조한 나노 WC및 WC-Co분말의 후속 열처리에 의한 상 및 협상 변화 KCI 등재
Change of Particle Morphology and Ingredient Phase of WC and WC-Co Nanopowders Fabricated by Chemical Vapor Condensation during Subsequent Heat-Treatment
- 언어KOR
- URLhttps://db.koreascholar.com/Article/Detail/2350
pp.124-129
Nanosized WC and WC-Co powders were synthesised by chemical vapor condensation(CVC) process using the pyrolysis of tungsten hexacarbonyl(W(CO)) and cobalt octacarbonyl(Co(CO)). The microstructural changes and phase evolution of the CVC powders during post heat-treatment were studied using the XRD, FE-SEM, TEM, and ICP-MS. CVC powders were consisted of the loosely agglomerated sub-stoichimetric WC and the long-chain Co nanopowders. The sub-stochiometric CVC WC and WC-Co powders were carburized using the mixture gas of CH-H in the temperature range of 730-85. Carbon content of CVC powder controlled by the gas phase carburization at 85 was well matched with the theoretical carbon sioichiometry of WC, 6.13 wt％. During the gas phase carburization, the particle size of WC increased from 20 nm to 40 nm and the long chain structure of Co powders disappeared.
