Re: Spraying of WC-12%Co

Posted by Gordon England ( on 13:24:15 14/05/06

In Reply to: Re: Spraying of WC-12%Co posted by Hong

One important point of preheating that has not be mentioned is for avoiding water condensation on the substrate.
I have seen coatings applied in some quite extreme conditions (temperature wise) some apparently successful, though I would not recommend this without thorough testing.
Generally I would advocate a preheat around the 100 C mark for steels, nickel alloys (not aluminium, magnesium, polymers etc..), possibly a little higher if you have good temperature control during spraying. Aim to control temperature during spraying at or near to your original preheat temperature avoiding as much as possible any temperature gradients or changes in temperature during the process.
Regards Gordon

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