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采用钨、碳和钴粉为原料,直接混合后经短时间高能球磨再通过碳化反应制备出纳米WC-10Co(质量分数)复合粉;分别用XRD和SEM分析了球磨和碳化反应后复合粉的物相组成和形貌,并采用热重-差示扫描量热法对碳化反应过程中的相变进行了分析。结果表明:高能球磨3 h后的W-C-10Co混合粉在1 000℃保温1 h即可获得晶粒尺寸为95 nm的WC-10Co复合粉,但其中存在少量的缺碳相η-Co_6W_6C,并且WC晶粒长大不完整;加热到1 100℃保温1 h后能得到完整的多边形片状WC颗粒,随球磨时间延长,碳化后复合粉中η相含量增多。
Using tungsten, carbon and cobalt powder as raw materials, directly after mixing by short-time high-energy ball milling and then carbonized by nano-WC-10Co (mass fraction) composite powder; XRD and SEM were used to analyze the ball milling and carbonization reaction Phase composition and morphology, and the thermogravimetry-differential scanning calorimetry was used to analyze the phase transition in the carbonization reaction. The results show that the WC-10Co powder with grain size of 95 nm can be obtained by WC-10Co mixed powder after 3 h of high-energy ball milling at 1000 ℃ for 1 h, but there is a small amount of η-Co_6W_6C WC grain growth is not complete; heated to 1 100 ℃ incubated 1 h after the polygonal sheet-like WC particles can be obtained, with the milling time, carbon content of η phase composite powder increased.