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Microstructure and surface characterization of Ni-Cr based composites containing variable solid lubricants

Mohamad, W.F. and Khan, A.A. and Barroy, P. and Durand-Drouhin, O. and Puille, C. and Lahmar, A. and Ahmad, F. (2020) Microstructure and surface characterization of Ni-Cr based composites containing variable solid lubricants. Tribology - Materials, Surfaces and Interfaces, 14 (4). pp. 219-228.

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Abstract

Ni-Cr based composites with and without the addition of solid lubricants (MoS2, Ag and CaF2) were prepared by powder metallurgy. The samples were sintered at 1200°C in flowing argon atmosphere for 1 hr. The physical properties such as sintered density, relative density and porosity were investigated. Microstructures and phase studies of the Ni-Cr based composites were conducted using SEM analysis. The hardness of the composites was measured by Vickers Micro Hardness Tester. Friction tests were performed with ball on disc configuration following ASTM G-99-95a standard. The MoS2 solid lubricant provided best lubrication at room temperature which was demonstrated by a low friction coefficient compared to pure Ni-Cr composites (0.176 compared to 0.394). The SEM pictures of worn out showed plastic deformation, solid debris distribution, and filling of pores with solid lubricant phases. The time taken for stabilization of friction coefficient also varied with the type of solid lubricant. Dual and multiple addition of solid lubricants reduced the friction of coefficient compared to pure Ni-Cr composite. SEM analysis revealed the spreading of solid lubricants during the sliding test to provide lubrication to both contacting metals.

Item Type:Article
Impact Factor:cited By 0
Uncontrolled Keywords:Binary alloys; Calcium fluoride; Chromium alloys; Chromium metallography; Chromium metallurgy; Fluorine compounds; Fluorspar; Friction; Layered semiconductors; Microhardness; Microstructure; Molybdenum compounds; Nickel metallography; Nickel metallurgy; Powder metallurgy; Sintering, Ball on disc configuration; Contacting metals; Friction coefficients; Low friction coefficients; Multiple additions; Sintered density; Surface characterization; Vickers microhardness, Solid lubricants
ID Code:23278
Deposited By: Ms Sharifah Fahimah Saiyed Yeop
Deposited On:19 Aug 2021 07:26
Last Modified:19 Aug 2021 07:26

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