Abstract
In this study, diamond coatings were deposited through the hot filament chemical vapor deposition method on cemented carbide under different methane concentrations, ranging from 1% to 5%, to analyze the performance of the diamond coatings under different loads and lubrication conditions . Friction and wear tests were carried out using ball-disk friction and wear tester under different loads and lubrication conditions. Scanning electron microscopy, high-resolution Raman spectrometry, optical microscopy, and a surface profiler were used to observe the surface morphology and quality of the coatings after the wear test. The results revealed that the coating prepared under 3% methane concentration was more stable during the friction test than that prepared under other methane concentrations. In addition, the coating prepared under 5% methane concentration had poor adhesion and experienced failure under excessive load. Furthermore, lubricating the friction surface with water effectively reduced the formation of abrasive wear and the friction coefficient, and thus the sample reached the stable stage faster. In addition, the wear rate of the coating under wet condition was approximately 4–5 times less than that under dry friction conditions.
Highlights
Diamond coatings have gained increased attention in various fields owing to their excellent properties such as high hardness, low friction coefficient, high wear resistance, high elastic modulus, high thermal conductivity, chemical inertness, and good biocompatibility [1, 2]
Diamond coating films prepared at 1%, 3%, and 5% methane concentrations were selected to analyze the influence of different methane concentrations on the film preparation.Fig.1 are the surface morphologies of diamond films prepared at a methane concentration of 1%, 3%, and 5%, respectively
When the methane concentration was increased to 3%, the typical crystal planes disappeared, the diamond grains in the film were refined, there were micron grains and a large number of nano grains, indicating that it became submicron diamond (SMCD)
Summary
Diamond coatings have gained increased attention in various fields owing to their excellent properties such as high hardness, low friction coefficient, high wear resistance, high elastic modulus, high thermal conductivity, chemical inertness, and good biocompatibility [1, 2]. Several studies have investigated the effects of gas conditions, humidity and temperature, the materials of friction pair and substrate, lubrication conditions, and doping elements on the friction properties and wear mechanism of diamond coatings [4,5,6,7,8]. Gardos [9, 10] investigated the friction properties of diamond coatings deposited on SiC through the chemical vapor deposition (CVD) method using a reciprocating friction tester with a scanning electron microscope under different temperatures and gas conditions (vacuum, hydrogen, oxygen, and nitrogen). In this study, diamond coatings were deposited on cemented carbide using the HFCVD method, and the friction and wear properties of the diamond coatings under different methane concentrations, loads, and lubrication conditions were investigating
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