Si_3N_4-Ni系结合剂聚晶立方氮化硼(PcBN)性能及刀具应用研究  

Performance of PcBN with Si_3N_4-Ni binder and application of the PcBN turning tool

作　　者：邹文俊[1] 郝德辉[1] 彭进[1] 董企铭[1] 李宝膺[1] 朱俊芳[1] 

机构地区：[1]河南工业大学材料科学与工程学院,郑州450007

出　　处：《金刚石与磨料磨具工程》2011年第3期43-46,50,共5页Diamond & Abrasives Engineering

基　　金：河南省杰出人才创新基金项目(0621001200)

摘　　要：本文研究了Si3N4-Ni系结合剂掺杂合成的PcBN的维氏硬度、抗弯强度、磨耗比、抗冲击韧性、车削性能与结合剂以及各掺杂物相对含量等的关系。采用金相显微镜、扫描电镜和X射线衍射仪等仪器设备对PcBN试样进行了微观组织结构和物相分析。分析表明,添加镍粉可有效提高PcBN的硬度和耐磨性,PcBN的烧结情况良好;结合剂对cBN高温润湿情况良好;有新的物相生成。氮化硅的存在添加镀镍氮化硅晶须使PcBN的抗冲击韧性和抗弯强度得到提高;被加工工件的表面粗糙度达到了0.8μm。In this paper,the micro hardness,bending strength,abrasion ratio,impact resistance and turning performances of PcBN with Si3N4-Ni binder were studied.The effect of the composite binder and the dopant content on such properties were discussed.The microstructure and phase composition of PcBN were investigated by scanning electron microscope（SEM） and X-ray diffraction（XRD）.The results showed that,cBN grits were well wetted by the composite binder under high temperature;the sintering of PcBN was in good condition;formations of a number of new phases were observed.The presence of Si3Ni4 effectively improved the performances of PcBN.The Si3Ni4 whiskers,especially Ni-coated Si3Ni4 whiskers,increased the impact resistance and bending strength of PcBN.The best surface roughness of workpiece machined with the above PcBN turning tool attained 0.8 μm.

关 键 词：聚晶立方氮化硼 氮化硅-镍黏结剂 掺杂 

分 类 号：TG74[金属学及工艺—刀具与模具] TQ164[化学工程—高温制品工业]