Solid State Science and Technology, Vol. 11, No 1 (2003) 109-117

THERMAL SPRAY COATING TECHNOLOGY A REVIEW

 

R.J. Talib, S.Saad, M.R.M. Toff , H. Hashim

Coating Materials Programme, AMREC, SIRIM Bhd

Lot 34, Jalan Hi-Tech 2/3, Kulim Hi-Tech Park, 09000 Kulim, Malaysia

 

 

ABSTRACT

Thermal spray coating involves heating of coating materials (ceramic, carbide, and metal alloys) to a semi-molten or molten state and propels to substrate. The flame temperature is in the range of 3,000 to 16,000 OC but the surface temperature of the substrate rarely exceeds 500 OC depending on the thermal spray processes being used. The coating materials are feed into the spray gun in the

form of powders, rods or wires. Thermal spray coating is use for the following purposes; (i)

increase corrosion and wear resistance, (ii) protection against electromagnetic, or electrostatic, (iii) protection against radio frequency interference, (iv) metal buildup and, (iv) cosmetic. Thermal spray coating can be categorized into five most common processes; (i) Flame arc spraying, (ii) Electric Arc spraying, (iii) Plasma arc spraying, (iv) High-velocity Oxy/Fuel (HVOF) and (v) Detonation Gun. In this paper, thermal spraying processes will be explained, along with the advantages and disadvantages of one another.

 

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