Tribological Properties of Nickel Based Coatings Sprayed by Plasma on Aluminum Alloy Surface at Different Temperatures

doi:10.3901/JME.2024.24.177

Abstract

Abstract: Nickel-based alloy is a typical superalloy material, with high hardness, good thermal stability, good wear resistance and other characteristics. It is widely used in the surface strengthening of aviation, automotive engines and industrial parts.Ni60 alloy coating was prepared on the surface of ZL109 aluminum alloy by plasma spraying technology, and its tribological properties were evaluated at different temperatures (T=25 ℃, 100 ℃ and 350 ℃). The Ni60 alloy coatings prepared at different spray distances (D=100 mm, 110 mm and 120 mm) were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The results show that with the increase of spraying distance, the defects such as pores and micro-cracks decrease gradually. The porosity decreased from 2.2% to 0.76%, and the fractal dimension decreased from 1.83 to1.57. The elemental composition (Ni, Fe, Cr, Si, C, B) and phase composition (Ni₃Fe, Cr₂₃C₆ and Cr₇C₃) of powder and coating are basically the same. The microhardness of the coating after spraying is about 5 times that of the substrate. When D=120 mm, the microhardness and bonding strength of the coating are the highest, which are 804 HV_0.1 and 26 MPa±2 MPa, respectively. At the stable stage, the friction coefficient of the coating decreases with the increase of temperature, and the change range is between 0.1 and 0.2. With the increase of friction temperature, the width, depth and volume wear rate of the coating increase gradually.

Key words: Ni60 alloy coating, micro-morphology, wear morphology, wear mechanism

CLC Number:

TG174

Han Bingyuan, Gao Xianghan, DU Wenbo, LI Hongliang, Cui Fangfang, WU Haidong, Zhu Sheng. Tribological Properties of Nickel Based Coatings Sprayed by Plasma on Aluminum Alloy Surface at Different Temperatures[J]. Journal of Mechanical Engineering, 2024, 60(24): 177-187.

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