•Coating method- Thermal Spray and Induction Fused. (Thermal coating by metco 6P-2 torch and fusing by induction heater.)
•Part material- AISI 1035 Steel Plunger (4.5'' Dia.) coated by Water atomized powder hogans74-W-60.
•Problem – Pin holes (found in Liquid penetrant test), micro porosity (found in LP and micro.)
Need suggestion on the above problem what can be the possible cause? And how it can be avoided. Any suggestion and comment is highly appreciated.
Vadim Verlotski
Poor surface preparation: oil and/or water condensation on the blasted surface, residual blasting material on the surface, component not preheated. Incorrect sintering: heating too slowly, sintering temperature too low or too high.
There are two main problems with such self-flowing NiCrBSi(C) alloy coatings:
In order to be able to say more precisely, you have to observe the entire coating process in every detail.
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