PCBN复合片合成与切削离心铸铁性能研究
2019-12-11
作者：陈超，莫培程，陈家荣，贾光，林峰，谢志刚
单位：中国有色桂林矿产地质研究院有限公司；广西超硬材料重点实验室；国家特种矿物材料工程技术研究中心
摘要：为了提高PCBN刀具加工离心铸铁的耐磨性和韧性，在PCBN合成过程中添加了具有增韧效果的ZrO2及具有较高耐磨性能的Al2O3进行试验，合成了20wt%~80wt%的PCBN复合片。试验采用共沉淀法制备了ZrO2Al2O3复合粉体，再将复合粉体与CBN微粉混合均匀后，在六面顶压机上进行高温高压烧结成块，研究了合成温度、CBN含量、氧化铝含量对PCBN复合片切削离心铸铁性能的影响。试验结果显示：添加ZrO2Al2O3复合粉体合成的低含量PCBN复合片具有较高的韧性和耐磨性能，能有效地对离心铸铁进行加工，刀具具有较长的使用寿命。
关键词：低含量PCBN复合片；切削；离心铸铁
中图分类号：TG704；TH140.7；TB333文献标志码：ADOI：10.3969/j.issn.1000-7008.2019.12.003
Study on Synthesis and Cutting Properties of PCBN Composites
Chen Chao，Mo Peicheng，Chen Jiarong，Jia Guang，Lin Feng，Xie Zhigang
Abstract:In order to improve the wear resistance and high toughness of PCBN tools for machining centrifugal cast iron，ZrO2 with toughening effect and Al2O3 with high wear resistance are designed and tested.PCBN composite sheets with 20%~80% mass content are synthesized.ZrO2 and Al2O3 powders are prepared by coprecipitation method.The effects of synthesis temperature，CBN content and alumina content on the properties of PCBN composite in cutting centrifugal cast iron are analyzed.The experimental results show that the low content PCBN composite sheet synthesized by adding ZrO2 and Al2O3 powder has higher toughness and wear resistance，can effectively process centrifugal cast iron，and the tool has longer service life.
Keywords:low content PCBN composite sheet；cutting；centrifugal cast iron