真空和渗氮烧结WC-TiC-Co硬质合金的梯度结构形成机理研究

doi:10.11896/cldb.18110198

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Abstract This paper has systematically investigated the gradient microstructures in WC-20TiC-0.5VC-0.5Cr₂C₃-12Co cemented carbides synthesized in vacuum and nitriding sintering, respectively. The study shows that sintering atmosphere has a critical effect on gradient structure of WC-TiC-Co carbide. The vacuum sintering results in a surface layer free of face center cubic (FCC) phase. The thickness of FCC-free surface layer is more than 20 μm. The nitriding sintering results in the formation of a FCC (Ti(C,N) and TiC) rich surface layer. It shows that N₂ pressure has an important effect on the thickness of FCC-rich surface layer. The higher N₂ pressure results in the thicker FCC-rich surface layer. The microstructure in the core of the carbides synthesized in either vacuum or nitriding sintering atmosphere shares similar microstructure of WC, (W,Ti)C, TiC and Co phases. Compared with nitriding sintering, vacuum sintering leads to coarser WC grains in the core of the carbide.

Key words： cemented carbide sintering atmosphere gradient structure microstructure

Published: 15 January 2020

CLC number:	TF125.3
	TG135.5

About author:: Jian Chenreceived his Ph.D. degree in June 2018 from Guangdong University of Technology in enginee-ring. From January 2017 to January 2018, he co-educated and learned at University of Utah. He is currently as a lecturer in Guangdong Polytechnic Normal University and participates in the development of the preparation of gradient cemented carbide, the cutting perfor-mance of cemented carbide tools and the manufacturing of composite materials;Xin Dengis currently a distinguished professor at school of electromechanical engineering, Guangdong University of Technology. He is “The Thousand Talents Plan” distinguished expert as well. He received his Ph.D. in materials science and engineering from the University of Alabama at Birmingham. Before he joined Guangdong University of Technology, he had worked as a senior engineer for both Kennametal Inc. and Schlumberger. With more than 17 years’ research and development experience of both the academia and the industry, Professor
Deng has developed expertise in a wide range of materials including lead-free solders, metal matrix composite, cemented carbides, polycrystalline diamond, and wear resistant coatings. His research interests also include fracture-mechanical behavior and finite element simulation of powder metallurgy, hard materials, and metal matrix composite, 3-D printing of cemented carbide and metal matrix composite, and other advanced material processing technologies. Professor Deng has authored/co-authored over 40 peer reviewed research papers and 8 US patents with 3 patents granted.

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	CHEN Jian
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	WU Shanghua

Cite this article:

CHEN Jian,ZHOU Li,LIU Jinyang, et al. Research on Formation Mechanisms of Gradient Structures for WC-TiC-Co Carbides Under Vacuum and Nitriding Sintering[J]. Materials Reports, 2020, 34(4): 4077-4082.

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http://www.mater-rep.com/EN/10.11896/cldb.18110198 OR http://www.mater-rep.com/EN/Y2020/V34/I4/4077

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