电场作用下预设烧结温度对WC-Co体系烧结的影响
Effect of Sintering Temperature on Sintering of WC-Co System Under Electric Field
李文波, 杨 屹, 刘 剑, 杨 刚
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作者单位：四川大学 制造科学与工程学院, 四川 成都 610065
中文关键字：硬质合金； 电场烧结； 液相； 热模拟
英文关键字：cemented carbide; electric sintering; liquid phase; thermal simulation
中文摘要：采用G1eeble热模拟机，在电场作用下制备了WC/Co系硬质合金，针对预设烧结温度对该体系烧结产物的影响进行了探讨，并对该体系烧结过程的温度场和合成产物进行了分析。结果表明，电场作用可降低体系的液相形成温度(750 ℃)，这远低于传统烧结时液相的形成温度(1350 ℃)。由于电场烧结的时间短，有效地抑制了WC晶粒的聚集长大。 在烧结过程中出现了Co3W3C和Co6W6C中间相。随着烧结温度的升高，烧结产物颗粒呈现长大的趋势，当烧结温度达到1000 ℃时，WC的平均颗粒尺寸约为1.5 μm，但仍远小于传统烧结的颗粒尺寸。
英文摘要：Cemented carbide was fabricated under electric field with Gleeble thermal instrument. The effects of sintering temperature on sintering products were discussed. The results show that electric field can decrease the formation temperature (750 ℃) of liquid phase, which is much lower than that of traditional sintering(1350 ℃). Moreover, due to short sintering time, electric field can effectively reduce the grain growth of WC. During sintering process, intermediate phases (Co3W3C, Co6W6C) are detected. Besides, average particle size of the sintering products grows with the sintering temperature increasing. When temperature reaches 1000℃, the grain size of WC is about 1.5 μm, which is much smaller than that of traditional sintering.