纯PCBN高压烧结行为与工艺规律  

Sintering Behavior and Technical Rule of Pure PCBN Synthesized under High Pressure

作　　者：邓雯丽[1,2,3] 邓福铭 张鹏[1,2,3] 周蕾蕾 席沛尧[1,2,3] 马向东[1,2] 

机构地区：[1]中国矿业大学(北京)超硬刀具材料研究所,北京100083 [2]中国矿业大学(北京)高压新材料研发中心,北京100083 [3]焦作天宝桓祥机械科技有限公司,河南焦作454150

出　　处：《高压物理学报》2018年第2期59-64,共6页Chinese Journal of High Pressure Physics

基　　金：高等学校博士学科点专项科研基金(20120023110016);北京市自然科学基金与北京市科学技术研究院联合基金(L150012);国家自然科学基金(51172278)

摘　　要：采用粒度为10μm的纯cBN微粉在不同的高压烧结工艺参数(烧结压力、温度和时间)下制备了纯聚晶立方氮化硼(PCBN)烧结体。利用扫描电镜观察了PCBN烧结体的微结构,并测试了其耐磨性和抗压强度,进而讨论了压力、温度和烧结时间对纯PCBN烧结体性能的影响规律。结果表明:对纯PCBN烧结体性能影响最大的因素是烧结压力,其次是烧结温度和时间;在本实验条件下,当压力为9GPa、温度为1 700℃和烧结时间为240s时,高压烧结得到的纯PCBN烧结体样品性能最优,其磨耗比为10 200,抗压强度为2.52GPa。In the present work,pure polycrystalline cubic boron nitride（ PCBN） sintered bodies were synthesized under different high pressure sintering conditions using 10 μm-sized cBN grains.The microstructure of the sintered pure PCBN bodies were investigated using the scanning electron microscope（ SEM） and X-ray diffractomer（ XRD）.The wear ratio and compressive strength of the sintered pure PCBN bodies were tested,and the effects of the sintering pressure,temperature and holding time on the microstructure and properties of sintered pure PCBN bodies were examined.The results show that the factors exerting the most significant influence on the properties of the sintered samples are the pressure,the sintering temperature and the holding time,in order of their degrees of influence.When they are 9 GPa,1 700 ℃ and 240 s,respectively,the optimal properties of the pure PCBN are achieved,i.e.with the wear ratio as 10 200 and the compressive stress as 2.52 GPa.

关 键 词：立方氮化硼(cBN) 纯PCBN烧结体 高压高温 耐磨性 抗压强度 

分 类 号：O521.2[理学—高压高温物理] O521.9[理学—物理]