Research on Microstructure and Properties of Supersonic Plasma Sprayed Mo Coating based on Orthogonal Experiment

doi:10.3969/j.issn.1000-1093.2016.08.022

Abstract

Abstract: In order to explore the anti-wear reinforcement of the surface of 45CrNiMoVA which acts as rail materials for electromagnetic railgun, Mo coating on 45CrNiMoVA surface was prepared by supersonic plasma spraying technology. The spray parameters are optimized by orthogonal experiment, and the effects of spray parameters on the properties of coating and the structure and properties of the optimal coating are discussed. The research results show that the coating has the best integrative property when spray voltage is 115 V, spray current is 380 A, Ar gas flow rate is 130 L/min, and spray distance is 100 mm. The conductivity, porosity, microhardness and adhesive strength of the optimal Mo coating are 6.01%IACS, 0.12%, 482.3 HV_0.1 and 52.1 MPa , respectively. The wear rate of optimal Mo coating is slightly lower than that of substrate at 5 N load and 5 Hz frequency, while its wear rate is only around half as that of substrate at 20 N load and 20 Hz frequency, and the wear mechanism is adhesive wear and oxidative wear.

Key words: ordnance science and technology, supersonic plasma spraying, 45CrNiMoVA, Mo coating, orthogonal experiment, structure, property

CLC Number:

TG174.442

LIU Gui-min， YANG Zhong-xu， ZHANG Yi-fan， YAN Tao， WEI Min. Research on Microstructure and Properties of Supersonic Plasma Sprayed Mo Coating based on Orthogonal Experiment[J]. Acta Armamentarii, 2016, 37(8): 1489-1496.

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