Effects of HfB2 and HfN Additions on the Microstructures and Mechanical Properties of TiB2-Based Ceramic Tool Materials

被引:19
作者
An, Jing [1 ,2 ]
Song, Jinpeng [1 ,2 ]
Liang, Guoxing [1 ,2 ]
Gao, Jiaojiao [1 ,2 ]
Xie, Juncai [1 ,2 ]
Cao, Lei [1 ,2 ]
Wang, Shiying [1 ,2 ]
Lv, Ming [1 ,2 ]
机构
[1] Taiyuan Univ Technol, Sch Mech Engn, Taiyuan 030024, Peoples R China
[2] Taiyuan Univ Technol, Shanxi Sci & Technol Dept, Shanxi Key Lab Precis Machining, Taiyuan 030024, Peoples R China
基金
中国国家自然科学基金;
关键词
TiB2-HfB2; ceramics; TiB2-HfN ceramics; hot-pressed sintering; microstructure; mechanical properties; CUTTING PERFORMANCE; COMPOSITES; TIB2; TEMPERATURE; DENSIFICATION; PARTICLES; BEHAVIOR; WHISKERS; PHASE;
D O I
10.3390/ma10050461
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The effects of HfB2 and HfN additions on the microstructures and mechanical properties of TiB2-based ceramic tool materials were investigated. The results showed that the HfB2 additive not only can inhibit the TiB2 grain growth but can also change the morphology of some TiB2 grains from bigger polygons to smaller polygons or longer ovals that are advantageous for forming a relatively fine microstructure, and that the HfN additive had a tendency toward agglomeration. The improvement of flexural strength and Vickers hardness of the TiB2-HfB2 ceramics was due to the relatively fine microstructure; the decrease of fracture toughness was ascribed to the formation of a weaker grain boundary strength due to the brittle rim phase and the poor wettability between HfB2 and Ni. The decrease of the flexural strength and Vickers hardness of the TiB2-HfN ceramics was due to the increase of defects such as TiB2 coarse grains and HfN agglomeration; the enhancement of fracture toughness was mainly attributed to the decrease of the pore number and the increase of the rim phase and TiB2 coarse grains. The toughening mechanisms of TiB2-HfB2 ceramics mainly included crack bridging and transgranular fracture, while the toughening mechanisms of TiB2-HfN ceramics mainly included crack deflection, crack bridging, transgranular fracture, and the core-rim structure.
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页数:11
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