In Situ Synthesis of Polycrystalline Cubic Boron Nitride Reinforced by Different Morphologic TiB2

被引：8

作者：

Zhong, Shenglin ^{[1
]}

Chen, Chuan ^{[1
]}

Li, Zhikai ^{[1
]}

Liu, Yang ^{[1
]}

Liu, Bingsai ^{[1
]}

Wu, Yi ^{[1
]}

机构：

[1] Guilin Univ Technol, Coll Mat Sci & Engn, Guilin 541004, Peoples R China

来源：

JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE | 2020年 / 29卷 / 06期

关键词：

PcBN; TiB2; in situ synthesis; microstructure; morphology; MECHANICAL-PROPERTIES; CRYSTAL MORPHOLOGY; CUTTING TOOLS; MICROSTRUCTURE; PRESSURE; AL; COMPOSITES; EVOLUTION;

D O I：

10.1007/s11665-020-04896-6

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Polycrystalline cubic boron nitride (PcBN) reinforced by different morphologic titanium diboride (TiB2) was in situ synthesized in the temperature range of 1100-1600 degrees C under an ultra-high pressure of 5.5 GPa in cBN-Ti-Al system. The composition and microstructure of PcBN composites were investigated by x-ray diffractometry, scanning electron microscopy and energy-dispersive spectroscopy. The mechanism and influencing factors of TiB(2)microstructure formation with different morphologies were analyzed. The mechanical properties of PcBN were also tested and analyzed. The results showed that the microstructure of TiB(2)evolves from whisker to plate and rod to granular as the temperature increases. Under the combined effects of phase composition, relative density and TiB(2)morphology, the microhardness of PcBN increased continuously, while the flexural strength first increased and then decreased. The high flexural strength was obtained at 1300 and 1400 degrees C, which were 840.39 and 823.32 MPa, respectively.

引用

页码：3784 / 3791

页数：8

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