PRESENTED BY : AJIT BEHERA National institute of technology, Rourkela

 Introduction on coating  Different between coating and thin film  Processes of coating  Why coating is necessary for aerospace component?  Some diagram of most affected area in aerospace vehicle.  Advantages of metallic coating  manufacturing country  protective composition  Protective treatments  parts which are necessary for coating  conclusion  reference National institute of technology, Rourkela CONTENT:

INTRODUCTION: National institute of technology, Rourkela  Coating is a covering that is applied to the surface of an object, usually referred to as the substrate. In many cases coatings are applied to improve surface properties of the substrate, such as appearance, adhesion, wetability, corrosion resistance, wear resistance, and scratch resistance.  Coatings may be applied as liquids, gases or solids.  coating agent may be metal or ceramic or alloy

National institute of technology, Rourkela Difference between coating and thin film : (If thickness of layer formed on substrate) > 1µm, then known as coating < 1 µm, then known as thin film  All paint on structural application in our daily life is called as coating, as they are of thickness >1 µm.

National institute of technology, Rourkela Coating processes:  atom transfer process: 1. CVD Process 2. PVD Process  Particle transfer process: 1. slurry spraying 2. flame spraying 3. plasma spraying  Plating and Related Processes

National institute of technology, Rourkela Why coating is necessary for aerospace component? When space vehicles are moving there are many conditions which affect the body of vehicle are:  High friction with air  Fatigue stress  water traps  Temperature  Pressure

National institute of technology, Rourkela

Advantages of metallic coatings: 1.Longer life equipement 2.Shortened maintenance time cycle 3.High fracture strength 4.High fatigue strength 5.High creep resistance 6.High thermal stability 7.High chemical stability 8.Cost effective than composite, etc…

National institute of technology, Rourkela The UE-204 pilot-production unit (2006) The UE-207P production unit (2005) Manufacturing of EB-PVD units in accordance with Customer requirements EB-PVD units of the last generation developed and manufactured at ICEBT are used in the USA, Canada, China, India.

National institute of technology, Rourkela  oxidation resistance of these metal can be improved by adding sufficient amount of Cr, Al, Ti or Si to form continuous external oxide scale.  the oxide such as Cr2O3, Al2O3 & SiO2 offer the best protection owing to their low growth rate.  In aerospace application, component are degraded by high temperature oxidation and other reaction in corrosive atmosphere. Also stress corrosion and fatigue corrosion affect much.

National institute of technology, Rourkela  The principal material used in airframe structures is high strength aluminum alloy sheet coated (clad) with a pure aluminum coating (alclad) which is highly resistant to corrosive attack.  Aluminum alloys, for example, are usually anodized (a chemical coating), or in some later generation aircraft an aluminum applied plating (ion vapor disposition (IVD)), then primed and possibly topcoated with paint.  Steel (except most stainless steels) and other metals, such as brass and bronze, require cadmium plating, zinc plating, IVD aluminum coating and/or conversion coating. Electrodeposited zinc alloy coatings have been considered as alternatives to cadmium plating for the protection of steel parts and fasteners. The main interest has been in electrodeposited zinc-nickel and zinc cobalt coatings. Cont…

National institute of technology, Rourkela Protective treatments : Material Protective treatments Aluminium alloys pre-treatment + chromate pigmented primer Steels cadmium plating + passivation Magnesium alloys pre-treatment + resin + primer Titanium alloys anodising

National institute of technology, Rourkela Metal coating of main parts in Aerocraft application  turbine blade & vanes are coated by NI3AL precipetates with Ni-solid solution matrix  Landing gears are coated with HVOF coating  Hot section engine components coated by aluminide coating / precious metal coating

National institute of technology, Rourkela Referrence: J.B. Wachtman, R.A. Haber (eds.), Ceramic Films and Coatings, Noyes Publications: Park Ridge, N.J R.W. Smith, in: Handbook of Thermal Spray Technology, 06994G, ASM International: Materials Park, OH, K.H. Stern (ed.), Metallurgical Protective Coatings, Chapman & Hall: London. ISBN:

National institute of technology, Rourkela