粘结剂钴对于聚晶金刚石复合片热稳定性的作用机制  

Mechanism of the Effect of Adhesive Co on the Thermal Stability of Polycrystalline Diamond Compact

作　　者：汪冰峰[1,2] 王斯琰[1] 唐治[3] 程丽乾[1] 

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083 [2]金瑞新材料科技股份有限公司,湖南长沙410012 [3]北京科技大学材料科学与工程学院,北京100083

出　　处：《矿冶工程》2009年第5期90-93,共4页Mining and Metallurgical Engineering

基　　金：中国博士后科学基金(20070420823);湖南省博士后科研专项计划项目(2008RS4038);长沙市科技计划项目(k0902021-11)

摘　　要：热稳定性是聚晶金刚石复合片(PDC)的一个重要性能指标。利用车削花岗岩法测定了PDC刀具的热稳定性能,采用热分析法、工具显微镜和扫描电子显微镜观测了PDC刀具中粘接剂钴的分布与形貌以及热损伤情况。研究表明:粘接剂Co热胀冷缩和氧化产生了热龟裂裂纹,导致PDC刀具机械性能降低,这是PDC刀具热稳定性下降的主要因素;PDC刀具中Co存在3种分布形式,分别是金刚石间的球粒状Co颗粒、"Co岛"和叶脉状的Co分布,其中以叶脉状分布的Co对PDC刀具的热稳定性影响最大。讨论了控制粘接剂Co分布与形貌以提高PDC热稳定性的方法。Thermal stability is an important performance parameter of polycrystalline diamond compact （PDC）. The thermal stability of PDC cutter was tested by turning granite method. The distribution and shape of adhesive Co and the thermal damage of PDC cutter were observed by thermal analysis, microscope tools and scanning electron microscope. The results indicate that the major factor for the reduction of thermal stability of PDC cutter was the reduction of mechanical properties of PDC cutter caused by the cracks of thermal checking generated by heat expansion and shrinking and oxidization of adhesive Co. There are 3 distribution forms of Co in PDC cutter, including spherical Co particles among diamonds, ＂Co island＂ and leaf-like Co, in which the leaf-like distributed Co affecting the thermal stability of PDC cutter was the most. The means of improving the thermal stability of PDC by controlling the distribution and shape of adhesive Co was discussed.

关 键 词：聚晶金刚石复合片 热稳定性 粘接剂 

分 类 号：TG501.1[金属学及工艺—金属切削加工及机床]