Technological Aspects of Forming the Surface Microrelief of Low-Wear Coatings after Electro-Diamond Grinding

7th International Scientific and Practical Conference on Innovations in Mechanical Engineering

机械制造;材料科学

Burov, V.G.^1 ; Yanpolskiy, V.V.^1 ; Rakhimyanov, K.Kh.^1

Faculty of Mechanical Engineering and Technologies, Novosibirsk State Technical University, 20 Prospekt K. Marksa, Novosibirsk

630073, Russia^1

关键词: Coating material;    Diamond grinding;    Electrochemical dissolution;    Polarization study;    Powder material;    Surface microreliefs;    Technological aspects;    Technological process;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/126/1/012018/pdf
DOI  :  10.1088/1757-899X/126/1/012018

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The results of electro-diamond grinding of coatings based on the WC25 powder material are presented in the paper. It is shown that after electro-diamond grinding of the WC25 coating, an obtained magnitude (Ra=2.02μ m) of surface roughness doesn't meet the qualifying standards to parts surface working in wear-out conditions. The forming of the obtained microrelief is probably connected to the features of electrochemical dissolution of the WC25 coating material in the electrolyte being used. Based on the polarization studies, it is revealed that the electrochemical dissolution character of the indicated coating in the water solution of 10%NaNO3is determined by the dissolution character of cobalt (Co) component. The intensive cobalt (Co) dissolution during the electro-diamond grinding of the WC25 coating leads to the tungsten carbide chipping by the grinding disk particles that increases the roughness. One of the way to improve the surface quality of low-wear coatings after electro-diamond grinding is an introduction of an additional step in a technological process, carrying out with the switched off source of technological current. For realization of the process according to this scheme a technological dimension chain is made which takes into consideration the dissolution value of the most active coating composition element while the calculating of the operating dimensions of a detail.