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Microstructural evolution during solid-state sintering of ball-milled nanocomposite WC-10 mass% Co powders

机译：球磨纳米复合WC-10质量％Co粉的固态烧结过程中的微观组织演变

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摘要

The microstructural evolution during solid-state sintering of nanocrystalline WC-10 mass% Co powders, prepared by different ball-milling processes to give rise to diverse mechanical activation states, is investigated. During sintering, two ternary carbides, Co6W6C and Co3W3C, form at the binder phase which surrounds WC particle aggregates. The overall microstructure of the sintered material ( including the formation of these carbides) is found to be very sensitive to the initial state of the powders, even more than to the sintering temperature and/or sintering time. In addition, the nanocrystalline nature of the composites is preserved during the solid-state sintering, in part assisted by the formation of these complex carbides and decarburization. This nanostructure yields moderate microhardness and fracture toughness values, in spite of the remaining levels of porosity.
机译：研究了通过不同的球磨工艺制备的纳米晶WC-10质量％Co粉末在固态烧结过程中的微观结构演变，从而产生了不同的机械活化态。在烧结过程中，两个三元碳化物Co6W6C和Co3W3C在围绕WC颗粒聚集体的粘结相中形成。发现烧结材料的整体微观结构（包括这些碳化物的形成）对粉末的初始状态非常敏感，甚至对烧结温度和/或烧结时间都非常敏感。另外，在固态烧结期间保留了复合材料的纳米晶体性质，部分地由这些复合碳化物的形成和脱碳辅助。尽管剩余的孔隙率水平，该纳米结构仍具有中等的显微硬度和断裂韧性值。

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