立方氮化硼-碳化钨-钴复合材料制备工艺的改进

Improvement of Preparation of Cubic Boron Nitride Dispersed WC-10Co Composites

摘要: 采用热压烧结方法在温度1 380 ℃、保温60 min、烧结压力30 MPa条件下制备了立方氮化硼(CBN)颗粒体积分数为30%的WC-10Co超细硬质合金复合材料,用化学气相沉积法对立方氮化硼进行了表面镀金属钛膜预处理.对复合材料的组织结构、密度、抗弯强度等性能进行了研究.结果表明：得到的烧结体的相对密度可达到94.2%,弥散立方氮化硼颗粒与超细硬质合金基体之间没有明显的间隙,CBN-WC-10Co复合材料的抗弯强度为750 MPa,WC的平均晶粒尺寸为400 nm;得到了组织结构均匀、力学性能优良的CBN-WC-10Co复合材料.

Abstract: WC-10Co nanocomposite powders were produced by continuous spray pyrolysis & carbonization technology and Ti-coated cubic boron nitride(CBN) was prepared by using chemical vapor deposition.Hot-pressing sintering technology was used to prepare CBN-WC-10Co composites at 1 380 ℃ under 30 MPa for 60 minutes.The microstructure,density,transverse rupture strength (TRS),and bonding conditions between CBN and ultrafine WC-10Co matrix were studied.The average grain size of WC grains is 400 nm,TRS of CBN-WC-10Co composites is more than 750 MPa and the relative density is 94.2%.CBN-WC-10Co composites with homogeneous microstructure and good mechanical properties are obtained.