Posted by Gordon England (62.252.0.12) on 23:10:37 13/04/05
In Reply to: Amorphous phase of WC-12Co coating posted by Arturas
: After X-ray analysis I got that amorphous phase of WC-12Co coating sprayed by HVOF increase with increasing fuel gas flow. How to explain it?
: Thank you.
Increasing amorphous phases is related to increasing particle temperature and melting. Ideally, tungsten carbide/cobalt particles should only be heated just enough to soften to provide deformation on impact and not to cause oxidation and reaction between cobalt and tungsten carbide phases. Sometimes you will find the density and hardness increasing with these amorphous phases, but generally they will adversely effect wear resistance and toughness of the coating.
Regards Gordon
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