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Microstructure and mechanical properties of wc-co-based cemented carbide with bimodal wc grain size distribution

稀有金属:英文版 2023年第8期42卷 2809-2815页

作者： Rui-Jun Cao Chen-Guang Lin Xing-Cheng Xie Zhong-Kun Lin Powder Metallurgy and Special Materials Department General Research Institute for Nonferrous MetalsBeijing 100088China

In order to improve the wear resistance of coarse-grained wc-co cemented carbides,the fine wc powder were used to reinforce the metallic *** wc-co-based cemented carbides having bimodal wc grain size distributions were synthesized by liquid phase *** comparison,the cemented carbides having unimodal wc grain size distributions were *** microstructure,hardness,fracture toughness and wear resistance of these cemented carbides were *** results show that adding fine wc powder is an effective method to improve the wear resistance of coarsegrained wc-co cemented *** wc size,mean free path and fracture toughness decrease with the addition of fine wc powder,while the hardness exhibits an opposite *** impact-wear coefficient of bimodal distribution cemented carbides is noticeably lower than that of the unimodal one with the same hardness,which means that the cemented carbides with bimodal grain structure have better combination of hardness and impact-abrasive wear *** impact-abrasive wear mechanism of the bimodal cemented carbides is that the fine wc grains prevent abrasive wear and the coarse wc grains prevent impact wear.

关键词： wc-co cemented carbide Impact wearing Bimodal distribution Hardness Mean free path

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Interaction of yttrium barrier and calcium-rich phase on production and properties of wc precursor powders and alloys

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Journal of Rare Earths 2024年第1期42卷 228-236,I0008页

作者： Wen He Dunqiang Tan Zhiqiang Yi Zhiqiang Liu School of Materials Science and Engineering Nanchang UniversityNanchang330031China Instrumental Analysis Center of Nanchang Hangkong University Nanchang330063China

In order to reduce or eliminate the adverse effects of calcium impurity,the interaction of Ca and rare earth Y co-doping on the preparation of wc-co cemented carbides was investigated.X-ray diffraction,scanning electron microscopy and transmission electron microscopy were employed to analyze the phase compositions,particle sizes and morphologies of them,*** results show that the second type of"yttrium barrier effect"is observed and the adverse influence of Ca-rich phase on tungsten powder can be eliminated by *** flexural strength and fracture toughness of YG6-0.01%Ca+0.09%Y alloy are 2199.5 MPa and 11.49 MPa·m^(1/2),showing improvement of 6.5% and 2.7% compared to YG6 alloy,*** evolutions of Ca-rich phase and Y-rich phase at the every alloy preparation stage of WO_(3),W,wc and cemented carbides are ***,the strengthening mechanism of wc-co cemented carbide with co-addition of Ca and Y is proposed.

关键词： Yttrium barrier effect Ca-rich phase wc-co cemented carbide Microstructures Mechanisms Rare earths

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维普期刊数据库

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Influence of Microgrooves on Friction Properties of wc-3wt.% co cemented carbide Against GCr15 Ball

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Journal of the Chinese Ceramic Society 2016年第4期3卷 183-191页

作者： HUANG Lirong CHEN Yuhang WANG Xiaolei college of Mechanical and Electrical Engineering Nanjing University of Aeronautics & Astronautics Jiangsu Key Laboratory of Precision and Micro-Manufacturing Technology School of Mechanical and Electrical Engineering Jiangxi University of Science and Technology

Two cemented carbides of the same nominal composition(wc-3wt%co) were prepared by two different preparation techniques,one of which had many microgrooves on the surface and the other was *** influence of micro-grooves on the friction properties of wc-co cemented carbides sliding against the GCr15 ball was *** and wear tests were also carried out using modified ball-on-disk equipment at a sliding speed of 150 mm/s and normal load condition of 5 *** result indicated that the wear track width and the GCr15 wear volume of the compact cemented carbide are much narrower than those of the porous ones,but the quality loss of the compact cemented carbide is slightly higher than that of the porous *** wear scars concentrate on a certain part of the compact cemented carbide,with a lot of abrasives on their *** the porous cemented carbide,the wear scars distribute uniformly,with only a little abrasives on their *** friction coefficient of the porous cemented carbide is smaller than that of the compact cemented carbide:the porous cemented carbide is about 0.4,but the dense cemented carbide is about 0.6 with some fluctuations during the stable phase.

关键词： wc-co cemented carbide porous structure friction properties

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