Plasma sprayed coatings on crankshaft used steels

5th ModTech International Conference - Modern Technologies in Industrial Engineering

Mahu, G.^1 ; Munteanu, C.^1 ; Istrate, B.^1 ; Benchea, M.^1

Gheorghe Asachi Technical University of Iasi, Faculty of Mechanical Engineering, 43 D. Mangeron Street, Iasi

700050, Romania^1

关键词: Lubrication system;    Micro indentation;    Morphological aspects;    Plasma coating;    Plasma spray coating;    Plasma-sprayed coatings;    Successive coatings;    Thermal coatings;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/227/1/012077/pdf
DOI  :  10.1088/1757-899X/227/1/012077

来源: IOP

【 摘 要 】

Plasma spray coatings may be an alternative to conventional heat treatment of main journals and crankpins of the crankshaft. The applications of plasma coatings are various and present multiple advantages compared to electric arc wire spraying or flame spraying. The study examines the layers sprayed with the following powders: Cr3C2- 25(Ni 20Cr), Al2O3- 13TiO2, Cr2O3-SiO2- TiO2 on the surface of steels used in the construction of a crankshaft (C45). The plasma spray coatings were made with the Spray wizard 9MCE facility at atmospheric pressure. The samples were analyzed in terms of micro and morphological using optical microscopy, scanning electron microscopy and X-ray diffraction. Wear tests on samples that have undergone simulates extreme working conditions of the crankshafts. In order to emphasize adherence to the base material sprayed layer, were carried out tests of microscratches and micro-indentation. Results have showed a relatively compact morphological aspect given by the successive coatings with splat-like specific structures. Following the microscratch analysis it can be concluded that Al2O3-13TiO2 coating has a higher purpose in terms of hardness compared to Cr3C2-(Ni 20Cr) and Cr2O3-SiO2- TiO2 powders. Thermal coatings of the deposited powders have increased the mechanical properties of the material. The results stand to confirm that plasma sprayed Al2O3-13TiO2 powder is in fact a efficient solution for preventing mechanical wear, even with a faulty lubrication system.