CAJ | 학술논문

传统制备WC粉末的方法都是依靠发热体的辐射、能量对流、传导等方式加热W、C混合粉末到一定温度，热量由外向内传递，具有加热温度高、周期长、WC颗粒长大明显等缺点。本研究以纳米钨粉和活性炭为原料，采用微波加热法在1000℃快速制备纳米WC粉末。用XRD分析不同碳化温度产物的物相组成，并用SEM和TEM对产物进行形貌和粒度分析。结果表明：平均粒径50 nm的钨粉经微波碳化法在1000℃保温10 min，能够制备出平均粒径为86.5 nm的单相WC粉末，纳米WC颗粒表面光滑，形貌呈近球形。分析微波碳化法制备纳米WC粉末的机理表明，微波碳化过程为扩散控制，WC颗粒的长大速率随碳化温度的升高而加快。
전통제비WC분말적방법도시의고발열체적복사、능량대류、전도등방식가열W、C혼합분말도일정온도，열량유외향내전체，구유가열온도고、주기장、WC과립장대명현등결점。본연구이납미오분화활성탄위원료，채용미파가열법재1000℃쾌속제비납미WC분말。용XRD분석불동탄화온도산물적물상조성，병용SEM화TEM대산물진행형모화립도분석。결과표명：평균립경50 nm적오분경미파탄화법재1000℃보온10 min，능구제비출평균립경위86.5 nm적단상WC분말，납미WC과립표면광활，형모정근구형。분석미파탄화법제비납미WC분말적궤리표명，미파탄화과정위확산공제，WC과립적장대속솔수탄화온도적승고이가쾌。
The traditional WC powder is generally prepared by heating tungsten and graphite mixture to a certain temperature through radiation, convection and conduction. This process requires both high temperature and a long time, so WC generally has large particle size. Using tungsten nano-powder and activated charcoal as raw materials, nano-structured WC was prepared by microwave carbonization at 1 000℃. The phase composition of samples has been characterized by XRD, the morphology and particle size distribution were observed by SEM and TEM. The results show that a single-phase WC with an average particle size of 86.5 nm can be prepared using W powder with the average particle size of 50 nm by microwave carbonization at 1 000 ℃ for 10 min. The formation mechanism of nano-WC powders prepared by microwave carbonization was discussed. It is shown that the microwave carbonization process is controlled by diffusion, and the growth rate of WC particle increases with the increase of carbonization temperature.