The Study of Microstructure and Mechanical Properties of Diesel Engine Piston Coated with Carbide Composites by Using HV
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REVIEW
The Study of Microstructure and Mechanical Properties of Diesel Engine Piston Coated with Carbide Composites by Using HVOF Method Erdinc Vural1
Received: 10 June 2020 / Accepted: 28 July 2020 Ó The Indian Institute of Metals - IIM 2020
Abstract Thermal barrier coating (TBC) materials inside the cylinder in diesel vehicles are used to increase the reliability, durability, engine efficiency and performance of the hot parts of metal components in the engine. For this reason, as the researches on TBC in diesel engines increase day by day, new thermal researches of barrier coating material inside cylinders are proceeding. Therefore, in this study, Cr3C2–25(NiCr), WC–10Co–4Cr and WC–12Co powders were coated on a piston of a diesel engine surface (AlSi12CuNi) by using HVOF method. The SEM images of coating layers were taken, and EDS and XRD analyses were done. Additionally, adhesion resistance, microhardness and surface roughness measurements of materials were done. In XRD studies, in Cr3C2–25(NiCr) coating layers, Cr3C2 and Cr7C3 composites, and in WC–10Co–4Cr and WC–12Co coating layers, WC, W2C and Co3W3C composites were found. The best adhesion resistance, maximum hardness value and minimum roughness value were detected on the samples that were coated with WC– 12Co powder. Keywords Diesel piston HVOF Coating Carbide powder
& Erdinc Vural [email protected]; [email protected] 1
Germencik Yamanturk Vocational School, Aydin Adnan Menderes University, Mesudiye Mahallesi Atatu¨rk Caddesi No:134, Aydın, Turkey
1 Introduction Some properties of materials are required according to their fields of use in engineering. These are material lightness, strength, thermal permeability, good surface properties, long life span, yield strength, corrosion, etc. properties. For this reason, it is possible to produce a more reliable and better material according to the area of use by applying surface treatment with a different material in terms of mechanical or physical properties without changing the structural properties of the materials [1–3]. One of the studies regarding to increasing the safety, endurance and working (system) performance of internal combustion engines (IC) is the coating of piston surfaces with ceramic materials [4–8]. In the IC engines, the burning fuel cylinders inside the combustion chamber result in rapid temperature and pressure change. While the engine is working, the piston is exposed to pressures higher that 8 MPa and the temperature of gas may reach to 2500 °C [9]. This deformation of piston surfaces reduces the service life of the material after a period of time, resulting in poor performance in the engine, an increase in brake specific fuel consumption and an increase in emission values. To prevent these surface deformations, high temperature, pressure and chemical wear (corrosion) occurring during the combustion event to prevent direct contact with the surface of the main material is one of the methods applied to cover the surface of the material with a ceramic material. By covering the
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