Spraying of WC-12%Co

Posted by Arturas ( on 13:07:17 20/04/06

I would like to get more information about influence of substrate temperature during the spraying on tungsten carbide coating properties.
Before spraying I preheat substrate with the gun flame up to 50-100C, and during the spraying process I try to keep temperature constant max. it exceed 150C. If it is necessary I use cooling with air.
But I get information that it is nonsense. And there is no problem with coating properties if temperature during the depositing time increase from 20C up to 250C.And preaheating is needless.
My opinion is that due internal stresses coating can rebound (go out).
And next question what is minimum thickness of WC/Co coating on steel substrate(hardness 250HB)that it couldn't brake due to preassure of 300bar
Best regards
Arturas Babilius

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