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thermal

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  • 1. BYG.ARUN KUMARV.ASHOKKUMAR
  • 2.  Thermal barrier coatings were originally developed for air craft engine applications in 1940 only recently have they been modified and tested for use in diesel engines This result in reduction of metal temperature of the component up to 170 deg C
  • 3.  Two coating techniques are used Surfacepreparation and Thermal spraying
  • 4.  Coating of a material on a substance is made to serve in the specific environment It is possible only if the coating is adherent to the surface of the component The coating flakes off or leaves the surface, the entire effort will go waste The adhesion and other properties of the coating mainly depend on the surface condition of the substrate
  • 5.  Cleaning  To remove foreign materials like grease, scale, rust, dirt etc from the surface of a component roughness  and rough enough to make the mechanical bonding, adequate
  • 6.  Wire flame spraying Plasma arc spraying
  • 7.  This technique involves feeding of a metallic wire into a flame produced by combustion of fuel gas This flame melts the wire and surrounding stream of compressed air spray the molten metal onto the substrate The temperature produced in this process is about 2600-31000C The wire has melting point about 2500 deg c
  • 8.  The plasma spraying uses coating materials in the form of powders, which are melted with plasma heat source The primary arc bas, usually argon or nitrogen are ionized by the electrical discharge from a high frequency arc starter the plasma can conduct currents as high as 2000A direct current, with voltage potentials ranging from approximately 30 to 80V
  • 9.  Prolonged exposure to a higher temperature oxidizing environment may lead to coating failure thermal expansion mismatch between the ceramic and metallic layers and failure appears to be strongly influenced by bond coat oxidation
  • 10. : ENGINE:  A single cylinder water cooled Kirloskar engine is used for our analysis. The water at room temperature is allowed to pass through the water jacket in the engine.  A The engine is coupled with the mechanical rope dynamometer for leading. The specification of the engine is given as follows.
  • 11. Engine name Kirloskar engineType Single cylinder vertical diesel engine.Rated rpm 1500Bore 79.9Stroke 110Capacity 553 ccCompression 16.5:1Ignition CIPower 5 Hp
  • 12.  without ceramic coating, the maximum brake thermal efficiency is 16% with ceramic coating, the maximum brake thermal efficiency is 20.4%.
  • 13. 60504030 Series 220100 Category Category Category Category 5 1 2 3 4
  • 14.  Ceramic thermal barrier coating is a problem solving technology which contributes to almost every branch of engineering. thermal barrier coating allows engineering to improve product and performance, reduce maintenance time, cost, save energy and reduce production cost.

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