提高WC—Co硬质合金顶锤质量的研究

Research on Improving the Properties of WC-Co Cemented Carbide Header

对烧结后的硬质合金顶锤进行热等静压（ＨＩＰ），能有效提高其密度，使其在合成金刚石生产中使用寿命普遍延长３—４倍。热等静压的最佳工艺条件是：温度在１３５０～１３７５℃，压力为８０～１００ＭＰａ，保温保压时间１００～１２０ｍｉｎ。同时，较全面地观察和分析了ＷＣ—Ｃｏ硬质合金破裂的行为，并阐述了采用ＨＩＰ处理能提高ＷＣ—Ｃｏ硬质合金顶锤质量的原因。

he density of the cemented carbide header can effectively increase after it is processed by the HIP. The service life of WC-Co alloys increases by 3￣ 4 times, also. The optimum technical conditions of HIP are as follows: the temperature range,pressure and time are 1350￣1375℃, 80￣100 MPa and 100￣ 120 min, respectively. The fracture behaviour of WC-Co carbide header was observated by means of JCXA-733 type electronic microanalyser. The reasons of improving the properties of WC-Co cemented carbide header processed by HIP are discussed in detail.