硬质合金高压熔渗制备聚晶立方氮化硼复合片

摘要

Under high temperature and high pressure conditions (HPHT, 5.2GPa, 1450℃),homogeneous Polycrystalline Cubic Boron Nitride (PcBN)compact ofΦ15 × 5 mm has been synthesized through the cemented carbide high pressure in situ melting infil-tration method.The structure morphology and phase composition of PcBN compact has been investigated through scanning electron microscope (SEM),X-radial Diffractometer (XRD)and Energy Disperse Spectroscopy (EDS).It's mechanism of composite interface has also been discussed.The experiment result shows that the WC and Co in the cemen-ted carbide (WC-Co)substrate spread into Cubic Boron Nitride layer through melting in-filtration.And the binding phase of WC,MoCoB and Co3 W3 C facilitate the interface re-combination of the PcBN compact,hence a compact"concrete"structure has been formed on the PcBN layer.%在高温高压条件下(HPHT,5.2 GPa,1450℃),通过硬质合金基体的高压原位熔渗法,制备了质地均匀的Φ15×5 mm的聚晶立方氮化硼(PcBN)复合片。采用扫描电子显微镜(SEM)、X 射线衍射仪(XRD)、能谱仪(EDS)等考察了PcBN复合片的组织形貌及物相成分,并对其界面复合机理进行了探讨。实验结果表明,硬质合金(WC-Co)基体中 WC 及 Co 通过熔渗扩散到立方氮化硼(cBN)层,通过 WC、MoCoB、Co3 W3 C等粘结相,实现了PcBN复合片的界面复合,PcBN层形成致密的“混凝土”结构。