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from a phase-lock loop. Consequently, the only electronic device not constructed from integrated circuits could be a strip-chart recorder.

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In this present study, thermal wear resistant fly ash coating was applied on AISI 304 stainless steel substrate by the plasma spray technique. Experiments were conducted under various time intervals (5 to 30 min) with temperature kept constant at 1500 o C. The coating was characterized for coating thickness, surface hardness, SEM morphology and surface roughness. The worn surfaces and cross section surfaces of the coating were examined using SEM. The wear rates of the coating were measured and the results showed that the wear rates were related to the punching time. AISI 304 stainless steel with the fly ash coating not only reduced the surface roughness from 1.31 to 0.76 µm, but also remarkable improved the thermal wear resistance. The fly ash coated specimen was found to be very effective in increasing the thermal wear resistance of the given AISI 304 stainless steel at 1500 o C.