cBN-Al2O3 composites in NaCl environment under high pressure and high temperature conditions

被引：4
|
作者：
Chu, Dongliang [1 ]
Ma, Hongan [1 ]
Wang, Jian [1 ]
Zhang, Zhuangfei [2 ]
Shen, Weixia [2 ]
Jia, Xiaopeng [1 ]
机构：
[1] Jilin Univ, Coll Phys, State Key Lab Superhard Mat, Changchun, Jilin, Peoples R China
[2] Zhengzhou Univ, Sch Phys & Engn, Minist Educ, Key Lab Mat Phys, Zhengzhou, Henan, Peoples R China
来源：
CERAMICS INTERNATIONAL | 2019年 / 45卷 / 14期
基金：
中国国家自然科学基金;
关键词：
cBN-Al2O3; composites; NaCl environment; HPHT; Thermogravimetric analysis; Vickers hardness; CBN; AL;
D O I：
10.1016/j.ceramint.2019.05.215
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
A series of experiments of cubic boron nitride (cBN)-Al2O3 composites was conducted in NaCl environment under a pressure of 5 GPa at 1200-1650 degrees C using a Chinese multi-anvil high-pressure apparatus. The oxidation resistance of cBN-Al2O3 composites reached 1300 degrees C, which was 200 degrees C higher than that of raw cBN powder. The porosity was estimated by the content of NaCl impurities in cBN-Al2O3 composites. The content of NaCl impurity increases with increasing temperature and decreases with increasing Al2O3 level under high pressure and high temperature conditions. cBN + 30 vol% Al2O3 sintered at 5 GPa and 1200 degrees C shows no NaCl impurity, and the Vickers hardness of the sample is 21.6 GPa which is half of cBN +10 vol% Al.
引用
收藏
页码：16792 / 16796
页数：5
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