烧结压力对整体PCBN刀具微结构与性能的影响及作用机理

邓雯丽; 邓福铭; 徐智豪; 贺雪花; 张鹏; 马向东; 成少华

doi:10.13394/j.cnki.jgszz.2018.5.0008

烧结压力对整体PCBN刀具微结构与性能的影响及作用机理

doi: 10.13394/j.cnki.jgszz.2018.5.0008

邓雯丽^1,2,
邓福铭^1,2, ,,
徐智豪^1,2,
贺雪花^1,2,
张鹏^1,2,
马向东^1,2,
成少华^2,3

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) 高压新材料研究中心, 北京 100083;
3. 东莞市双华电子科技有限公司, 广东东莞 523320

基金项目:

北京市自然科学联合基金（No.15L00025）；中国矿业大学（北京）能源安全产业技术研究院共建研发中心项目（No.2017-03）；北京市教委大学本科生创业计划（No.8004530104）资助；中央高校基本科研业务费资助项目（No.2010-YJ13）。

详细信息

作者简介:
邓雯丽,女,1990年生,博士研究生。主要研究方向:超硬刀具材料及应用。E-mail:393454753@qq.com

通讯作者:
邓福铭,男,1963年生,教授、博士生导师。主要研究方向:金刚石、立方氮化硼等超硬材料及其应用。E-mail:dfm@cumtb.edu.cn

中图分类号: TG71;TQ164
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出版历程
- 修回日期: 2018-11-12
- 网络出版日期: 2022-07-10

Effect and mechanism of sintering pressure on microstructure and property of solid PCBN tools

DENG Wenli^1,2,
DENG Fuming^{1,2
, ,},
XU Zhihao^1,2,
HE Xuehua^1,2,
ZHANG Peng^1,2,
MA Xiangdong^1,2,
CHENG Shaohua^2,3

1. Institute of Super-hard Cutting Tool Materials, China University of Mining and Technology(Beijing), Beijing 100083, China;
2. Research Center of High Pressure Materials, China University of Mining and Technology(Beijing), Beijing 100083, China;
3. Dongguan Shuanghua Electronics Co., Ltd., Dongguan 523320, Guangdong, China

摘要

摘要: 将粒度尺寸5 μm的CBN微粉与黏结剂Al的混合粉末在国产六面顶压机上高压烧结制备整体PCBN材料，通过对样品磨耗比、显微硬度的测试与分析获得了较优的烧结工艺参数：烧结压力5.4 GPa、烧结温度1500℃和烧结时间240 s。测得样品的显微硬度为3897HV5（加载时间15 s），磨耗比为8750。SEM、TEM观察和XRD衍射分析表明：提高烧结压力可使CBN颗粒产生一定的塑性流动，抑制烧结过程中CBN颗粒表面逆转成hBN；黏结剂Al可与CBN颗粒表面反应形成中间产物AlN和AlB₂，在CBN颗粒之间形成牢固的陶瓷中介结合，并消除CBN烧结过程中残余的hBN，从而提高整体PCBN刀具的性能。
- 聚晶立方氮化硼(PCBN) /
- 整体PCBN刀具 /
- 高压烧结 /
- 六方化 /
- 微结构
Abstract: The whole polycrystalline cubic boron nitride (PCBN) tools were prepared by high temperature and high pressure sintering with size 5 μm CBN and binder Al powders on the domestic cubic press.The optimum sintering parameters were obtained by testing and analyzing the wear ratio and microhardness of samples. The sintering pressure was 5.4 GPa, the sintering temperature was 1500℃ and the sintering time was 240 s with hardness of 3897HV5 (loading time 15 s). The microhardness of the sample are HV3897, and the wear ratio was 8750. SEM, TEM observation and XRD analysis show that increasing of sintering pressure can make CBN particles produce a certain plastic flow, and inhibit the surface of CBN particles to reverse into hBN during sintering process. The binder Al can react with the surface of CBN particles to form the intermediate products AlN and AlB₂, which can form a solid ceramic bond between CBN grains and eliminate the residual hBN during sintering, thus improving the performance of the integral PCBN tool.
- polycrystalline cubic boron nitride /
- integral PCBN tool /
- high pressure sintering /
- hexagonalization /
- microstructure