Preparation of ultrafine WC-Co powder via fluidized bed  

作　　者：Huijun Shang Hengli Li Weijun Li Feng Pan Zhan Du 

机构地区：[1]State Key Laboratory of Mesoscience and Engineering,Institute of Process Engineering,Chinese Academy of Sciences(CAS),Beijing 100190,China [2]College of Chemistry and Chemical Engineering,Shihezi University,Shihezi 832003,China [3]College of Chemical Engineering,University of Chinese Academy of Sciences,Beijing 100049,China [4]Chinalco Environmental Protection and Energy Conservation Group Co.,Ltd.,Xiong'an 071700,China

出　　处：《Chinese Journal of Chemical Engineering》2024年第9期15-26,共12页中国化学工程学报（英文版）

基　　金：financial support from the National Natural Science Foundation of China(22078326,21878305).

摘　　要：In this study,the effects of reaction parameters on the deep-reduction and carbonization process of WO_(2)-Co to WC-Co were studied.The results indicate that the oxygen loss rate of WO_(2) is positively correlated with temperature and methane partial pressure.The partial pressure of methane has no significant effect on the formation rate of WC.The carbon content and particle size of the product increase with the increase of CH_(4) partial pressure.By synergistically regulating the reaction temperature to 950℃,the CH_(4) partial pressure to 1.25%,and the reaction time to 60 min,ultrafine WC-Co powder without η phase can be obtained.The particle size of the composite powder is 128 nm,with total carbon content of 6.16%,free carbon content of 0.4%,and residual oxygen content of 0.05%,respectively.The growth rate relationship of tungsten carbide is as follows:δ(t)=1.21×10^(-13)exp(-12809.72/T)√t.

关 键 词：Ultrafine WC-Co powder Gas-solid reaction FLUIDIZATION Reaction process regulation Growth rate equation 

分 类 号：TB383.3[一般工业技术—材料科学与工程]