立方氮化硼超硬刀具材料的合成与性能研究  

Synthesis and properties of cubic boron nitride superhard tool materials

作　　者：黄建娜[1] 张洁溪 马玉琳 HUANG Jianna;ZHANG Jiexi;MAYulin(Henan Polytechnic Institute,Nanyang 473000,China;Henan Costar Group Co.,Ltd.,Nanyang 473000,China)

机构地区：[1]河南工业职业技术学院,河南南阳473000 [2]河南中光学集团有限公司,河南南阳473000

出　　处：《粉末冶金工业》2023年第1期89-93,共5页Powder Metallurgy Industry

基　　金：河南省2019年科技发展计划项目(192102210165)。

摘　　要：以CBN微粉、WC粉和Co粉为原料,在六面顶压机上合成PCBN复合片。研究了立方氮化硼超硬刀具材料(PCBN复合片)的合成规律,对PCBN复合片的微观结构和性能进行了分析。研究发现,当烧结温度为1 750℃时,WC/Co结合剂对CBN颗粒的结合力增强,此时样品的磨耗比最大,为7 750。将1 750℃烧结出的PCBN复合片做成刀具,连续切削球墨铸铁,切削里程为20 km时,PCBN刀具后刀面磨损量(VB)最小,为0.272 mm。随着温度升高,样品中的颜色偏差越来越少,厚度分布越来越均匀,平整度逐渐变好,说明提高烧结温度有助于提高复合片中CBN聚晶层的平整度。The synthesis law of cubic boron nitride superhard tool material(PCBN composite) was studied, and the microstructure and properties of PCBN composite were analyzed. PCBN composite sheets were synthesized by using CBN powder, WC powder and Co powder as raw materials on a hexahedral top press. The results show that when the sintering temperature is 1 750 ℃, the binding force of WC/Co binder to CBN particles is enhanced, and the wear ratio of the sample is the largest, which is 7 750. The PCBN composite piece sintered at 1 750 ℃ is made into a tool to continuously cut nodular cast iron. When the cutting mileage is 20 km, the wear amount(VB) of the rear face of the PCBN tool is the smallest, which is 0.272 mm. With the increase of temperature, the color deviation in the sample is less and less, the thickness distribution is more and more uniform, and the flatness is gradually improved, which indicates that increasing the sintering temperature is helpful to improve the flatness of the CBN polycrystalline layer in the composite.

关 键 词：PCBN复合片 WC 高温超高压 铸铁 

分 类 号：TG711[金属学及工艺—刀具与模具] TQ163[化学工程—高温制品工业]