International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 02 | Feb -2017
p-ISSN: 2395-0072
www.irjet.net
Different Coating Processes for Surface Hardening of Aluminium Kumavat Mukesh Manilal1, Prof. Londhe B.C.2, Prof. Ghodake A.P.3, Prof. Gujrathi T.V.4 1 PG
Student (Machine Design), Savitribai Phule Pune University, SND COE & RC Yeola, Maharashtra, India 2 Associate Professor, Dept. of Mechanical Engineering, SND COE & RC Yeola, Maharashtra, India 3,4 Assistant Professor, Dept. of Mechanical Engineering, SND COE & RC Yeola, Maharashtra, India ---------------------------------------------------------------------***---------------------------------------------------------------------
Abstract - Materials engineers constantly create and
improve the properties of materials by applying the existing knowledge of science. This is because newly developed materials can easily be used as replacement of the current ones. The requirements of individual components with regards to properties like hardness, corrosion, wear, impact, strength, and economic considerations finally decide the material to be preferred. Technological progresses compel the use of materials in increasingly extreme and aggressive conditions, such as corrosive atmospheres. Corrosion is one of the most frequently encountered causes of failure of components. Corrosion is a complex series of oxidation/reduction reactions between the metal/alloy surfaces and liquid media. Nearly all metals will corrode to some degree. Corrosion can be concentrated locally to form a pit or crack, or it can extend across a wide area more or less uniformly corroding the surface. Because corrosion is diffusion controlled process, it occurs on exposed surfaces. Localized corrosion could result in structure failure of metallic materials if it is allowed to reach critical levels. Key Words: Different Coating Processes, Alloying, Spraying, Laser Coating, Laser Surface Hardening.
1. INTRODUCTION Aluminium and its alloys are high potential non-ferrous materials used universally. These alloys are of great interest to a wide range of industries because they exhibit quite an attractive variety of favorable mechanical and chemical properties. Aluminium and its alloys exhibit excellent mechanical strength, low specific weight, good formability and have relatively low cost and thus are widely used for industrial applications. The automotive industry is the dominant market for aluminium products throughout the world. Cylinder heads, engine blocks, closure panels, such as boots, trunk lids and door panels. Structural components made from aluminium and its alloys are vital to the aerospace industry. Inspire of all the attractive properties exhibited by these alloys, industrial applications are still limited. The surface properties of aluminium alloys are insufficient for many engineering requirements. Aluminium alloys possess poor tribological properties and load bearing capacity due to their low melting points, low hardness and weak interatomic bond. To avoid all these problems we need to develop a proper material with proper coating process. So for this Š 2017, IRJET
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Impact Factor value: 5.181
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reason we will discuss the different types of coating for aluminium.
1.1 Different Coating Processes 1.1.1
Chemical vapor deposition
1. Metal organic vapour phase epitaxy. 2. Electrostatic spray assisted vapour deposition (ESAVD).
1.1.2
Physical vapour deposition
1. Cathode arc deposition 2. Electron beam physical vapour deposition (EBPVD) 3. Ion plating 4. Ion beam assisted deposition (IBAD) 5. Pulsed laser deposition 6. Vacuum deposition 7. Magnetron sputtering 8. Sputter deposition 9. Vacuum evaporation
1.1.3
Chemical and electrochemical techniques
1. Anodizing 2. Chromate conversion coating 3. Plasma electrolytic oxidation 4. Ion beam mixing 5. Plating 6. Electro less plating 7. Electroplating 8. Sol-gel
1.1.4
Spraying
1. High velocity oxygen fuel (HVOF) 2. Plasma spraying 3. Thermal spraying 4. Laser coating
1.2 1.2.1
Chemical vapour deposition Metal organic vapour phase epitaxy
Metal organic Vapour Phase Epitaxy is a technique which used for forming high quality single crystalline thin films of different materials on different based material. The MOVPE ISO 9001:2008 Certified Journal
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