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**4** 

**Cast Iron Substrate** 

*Kanchanbagh, Hyderabad,* 

*Bangalore, India* 

**Erosion Behavior of Plasma Sprayed Alumina** 

N. Krishnamurthy1, M.S. Murali2, B. Venkataraman3 and P.G. Mukunda4

In plasma arc spraying process also known as plasma spraying process, the thermal energy of an electric arc (40 kW or 80kW) together with a plasma forming gas, which would be either nitrogen or argon, are utilized in melting and propelling of the deposit material at high velocities (600 mS-1) onto a substrate. This process is capable of generating very high temperature, exceeding 16,000 C, which can be gainfully employed in the deposition of materials with high melting points. The deposited material is generally in a powder form and requires a carrier gas to feed it into the combustion chamber. The process enables discharging high bond strengths of the coatings due to the very high propulsion velocities of

In a DC plasma arc process, gas heating is enough to generate core plasma temperatures exceeding 20000 °C depending upon the properties of gas and its electrical break down characteristics. Enthalpy of the gas is an indicator of its heating potential while it is getting

The technique can be used to deposit a wide range of ceramics and metals and their

It is possible to deposit alloys and mixed ceramics with components of widely differing

Homogenous coatings can be formed for any composition while maintaining

The following are some of the unique features of the plasma spraying process.

vapor pressures without significant changes in composition.

**1. Introduction** 

the impinging particles.

translated to plasma state.

combinations as well.

uniformity in their thickness.

**1.1 Special features of plasma spraying technique** 

**and Calcia-Stabilized Zirconia Coatings on** 

*1Mechanical Engineering Department, K.S. Institute of Technology, Bangalore,* 

*4Mechanical Engineering Department, Nitte Meenakshi Institute of Technology,* 

*3Surface Engineering Group, Defence Metallurgical Research Laboratory,* 

*2Auden Technology and Management Academy, Bangalore,* 

