ON THE USE OF Mo/Mo2C GRADIENT INTERLAYERS IN DIAMOND DEPOSITION ONTO CEMENTED CARBIDE SUBSTRATES

Jie Gao, Hongjun Hei, Ke Zheng, Xueyan Gao, Xiaoping Liu, Bin Tang, Zhiyong He and Shengwang Yu
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Jie Gao: Research Institute of Surface Engineering, Taiyuan University of Technology, Taiyuan 030024, P. R. China
Hongjun Hei: Research Institute of Surface Engineering, Taiyuan University of Technology, Taiyuan 030024, P. R. China
Ke Zheng: Research Institute of Surface Engineering, Taiyuan University of Technology, Taiyuan 030024, P. R. China
Xueyan Gao: Research Institute of Surface Engineering, Taiyuan University of Technology, Taiyuan 030024, P. R. China
Xiaoping Liu: Research Institute of Surface Engineering, Taiyuan University of Technology, Taiyuan 030024, P. R. China
Bin Tang: Research Institute of Surface Engineering, Taiyuan University of Technology, Taiyuan 030024, P. R. China
Zhiyong He: Research Institute of Surface Engineering, Taiyuan University of Technology, Taiyuan 030024, P. R. China
Shengwang Yu: Research Institute of Surface Engineering, Taiyuan University of Technology, Taiyuan 030024, P. R. China

Surface Review and Letters (SRL), 2016, vol. 23, issue 02, 1-8

Abstract: Molybdenum/molybdenum carbide (Mo/Mo2C) gradient interlayers were prepared via double glow plasma surface alloying (DGPSA) technique onto cemented carbide (WC–Co) substrates for diamond deposition. The morphologies, phase composition and adhesion of the interlayers were investigated, as well as their effect on the subsequent diamond deposition. The results indicated that the Mo/Mo2C gradient interlayer deposited on WC–Co substrate was composed of 4.0-μm-thick diffusion layer and 2.7-μm-thick deposition layer. The Mo concentration decreased gradually with the depth direction whereas the Co and W concentrations increased. As a result, the Co binder phase was completely restricted within the substrate by the diffusion layer. The presence of gradient diffusion layer ensured excellent adhesion of the interlayer. Subsequently, nanocrystalline diamond coatings with excellent adhesion were deposited on the interlayered substrates. Thus, the Mo/Mo2C gradient interlayers deposited via DGPSA technique were demonstrated as a novel option for depositing adherent diamond coatings on WC–Co substrates.

Keywords: Diamond coating; cemented carbide; adhesion; mo/mo2c gradient interlayer; double glow plasma surface alloying technique (search for similar items in EconPapers)
Date: 2016
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DOI: 10.1142/S0218625X15501097

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