Interfacial bonding mechanism of high-pressure sintered Al-Ti-cBN composites

被引：13
作者：
Deng Wen-li [1 ,2 ]
Deng Fu-ming [1 ,2 ]
Liu Rui-ping [1 ,2 ]
Zhang Peng [1 ,2 ]
Ma Xiang-dong [1 ,2 ]
Xu Zhi-hao [1 ,2 ]
机构：
[1] China Univ Min & Technol Beijing, Inst Super Hard Cutting Tool Mat, Beijing 100083, Peoples R China
[2] China Univ Min & Technol Beijing, Res Ctr High Pressure Mat, Beijing 100083, Peoples R China
来源：
DIAMOND AND RELATED MATERIALS | 2019年 / 91卷
关键词：
Cubic boron nitride; Microscopic morphology; Interface; Phase composition; CUBIC BORON-NITRIDE; SYSTEM;
D O I：
10.1016/j.diamond.2018.11.003
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The cBN powder with Al,Ti additives was sintered on a hinge cubic press with a sintering pressure of 5.6 GPa, a sintering temperature of 1550 degrees C, and a sintering time of 180 s. SEM, EDS, XRD and TEM were used to analyze the micro-morphology, element distribution and phase composition of the samples, and the microstructure and interface bonding mechanism of the sample were discussed. The results showed that the exothermic reaction of cBN with Al and Ti resulted in the reaction product AIN transforming into a liquid phase under high temperature conditions, which dissolved the reversely transformed hBN and resulted in the precipitation and growth of cBN grains, forming cBN cBN bonding, and it was found that cBN and cemented carbide interface existed 12-13 mu m special melt alloy transition zone, the main components of the interface were Co and AITi alloys. This special interfacial structure is formed by the high-pressure infiltration of the AITi alloy melts firstly and then the Co melts, which can form a continuous three-dimensional network of Co and AITi alloys thus forming strong bonding in the interface of cemented carbide and cBN layer.
引用
收藏
页码：29 / 33
页数：5
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