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Microstructure and mechanical properties of hot isostatically pressed cermets with TiN coatings

Rare Metals 2006年第6期25卷 643-648页

作者： ZHENG Liyun XIONG Weihao YAN Xianmei LI Guo＇an State Key Laboratory of Die ＆ Mould Technology Huazhong University of Science and Technology Wuhan 430074 China School of Electromechanical Engineering Hebei University of Engineering Handan 056038 China

To increase the adhesion strength between the coating and the substrate, sintered Ti（C,N）-based cermets were selected and deposited with monolayer TiN using a multiarc ion-plating technique; subsequently, hot isostatic pressing （HIPhag） treatment was performed at 1000℃ using nitrogen pressure up to 110 MPa. The mechanical properties of cermets after a coating process and subsequent HIPing treatment have been evaluated with respect to the hardness, the residual stress, and the coating adhesion. The results show that atter the HIPing process, there was a higher increase ha critical load ha the TiN-coated cermets with lower surface roughness compared with those with higher surface roughness. In all cases, the residual stress was found to be compressive. The effects of substrate surface roughness and posttreatment on the adhesion strength of the coatings were thus investigated. It was also fotmd that the HIPing posttreatment process is well suited for hacreasing the adhesion strength between the coating and the substrate.

关键词： materials surface and interface coating adhesion hot isostatic pressing cermets

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Effect of MgCl_(2) on electrophoretic deposition of TbF_(3) powders on Nd-Fe-B sintered magnet

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Journal of Rare Earths 2023年第5期41卷 721-727,I0004页

作者： Chen Wang Yang Luo Zilong Wang Wenlong Yan Yanyan Zhao Ningtao Quan Haijun Peng Kaiwen Wu Yuehua Ma Chunlei Zhao Dunbo Yu National Engineering Research Center for Rare Earth GRINM Group Co.Ltd.Beijing 100088China GRIREM Advanced Materials Co. Ltd.Beijing 100088China General Research Institute for Nonferrous Metals Beijing 100088China

Using electrophoretic deposition(EPD)method,the TbF_(3)powders were deposited on the surface of sintered Nd-Fe-B magnets,and the effects of MgCl_(2)on electrophoretic deposition and grain boundary diffusion were *** results show that addition of 5 wt%MgCl_(2)can significantly improve the EPD efficiency and improve the adhesion of the coating by releasing local stress through the formation of special gully *** with Biesheuvel equation,the effects of suspension concentration,voltage and time on EPD amount were *** Biesheuvel equation can be simplified asγ=AUSct/L,and A(=0.0141-0.0144)in this experiment was calculated to achieve the quantitative calculation of EPD *** heat treatment of 875℃×10 h+500℃×1 h,the coercivity of 48H(7 mm)sintered magnet with 0.3 wt%TbF_(3)increases from 18.5 to 22.4 kOe,with an increase of 21.1%.The core-shell structure was observed by a back-scattered scanning electron microscope(BSE-SEM),which proves that the addition of MgCl_(2)has no adverse effect on the grain boundary diffusion of Nd-Fe-B sintered magnets.

关键词： Electrophoretic deposition Nd-Fe-B TbF_(3) coating adhesion Grain boundary diffusion Rare earths

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