Phase transformation of nano-grained W(Co,C)composite powder and its phase constitute
来源期刊：中南大学学报(英文版)2006年第6期
论文作者：曹顺华 蔡志勇 周建华 李炯义 林信平
文章页码：603 - 607
Key words：cemented carbide ; phase transformation;high-energy ball milling;fibrous WC grain
Abstract: A new process of WC-Co cemented carbide was developed by using nano-grained W(Co,C)composite powders as raw materials processed by high-energy ball milling.X-ray diffraction(XRD),differential thermal analysis(DTA),thermo-gravimetric (TG)analysis and coercive forces of the sintered samples were adopted to analyze the phase transformation and constitution,and the microstructures of sintered samples were characterized by scanning electron microscopy(SEM).The results show that the as-milled powders are transformed into transitional phases W2C and η(Co3W3C or Co6W6C)during sintering,and finally transformed into WC and Co phases completely at 1 250℃for 30 min,and a large number of fibrous WC grains with about 1.2μm in length and 100 nm in radial dimension are formed in the sintered body at 1 300℃.
