EFFECT OF SUBSTRATE TEMPERATURE ON TANTALUM CARBIDES INTERLAYERS SYNTHESIZED ONTO WC-Co SUBSTRATES FOR ADHERENT DIAMOND DEPOSITION

Shengwang Yu, Jie Gao, Xiaojing Li, Dandan Ma, Hongjun Hei, Yanyan Shen, Wolong Rong, Xiaoping Liu, Zhiyong He and Bin Tang
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Shengwang Yu: Research Institute of Surface Engineering, Taiyuan University of Technology, Taiyuan 030024, P. R. China
Jie Gao: Research Institute of Surface Engineering, Taiyuan University of Technology, Taiyuan 030024, P. R. China
Xiaojing Li: #x2020;The Ningbo Branch of Ordnance Science Institute of China, Ningbo 315103, P. R. China
Dandan Ma: 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
Yanyan Shen: Research Institute of Surface Engineering, Taiyuan University of Technology, Taiyuan 030024, P. R. China
Wolong Rong: 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
Zhiyong He: 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

Surface Review and Letters (SRL), 2019, vol. 26, issue 02, 1-13

Abstract: Tantalum carbides (TaXC) interlayers have been synthesized by double glow plasma surface alloying (DG-PSA) method at different temperature for subsequent deposition of diamond coatings. The evolution of the microstructures, phase composition and adhesion of the interlayers dependent on substrate temperature has been discussed. The results show that the layers are composed of TaXC (i.e. Ta2C, TaC) with nanocrystalline microstructure and small amounts of CoTa2. The layer produced at 700∘C is formed of specific flower-shaped rings embedded in smooth structures. As the temperature increases to 800∘C, interacted rings are covered the full surface, and the surface roughness is increased. As the temperature increases further, the rings are replaced by irregular-shaped pits, caused a decreasing surface roughness. Besides the special microstructure with interactional rings and relatively high roughness, the layer prepared at 800∘C possesses higher adhesion, better wear performance and higher hardness than those of other layers. The coating obtained on the interlayer pretreated at 800∘C exhibits the best adhesion. Thus, the TaXC interlayers synthesized at 800∘C are demonstrated as a suitable option for adherent diamond coatings deposited onto WC-Co substrates.

Keywords: TaXC interlayer; substrate temperature; cemented carbides; diamond coating; adhesion (search for similar items in EconPapers)
Date: 2019
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DOI: 10.1142/S0218625X1850138X

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