(01-15-2020, 01:42 PM)demionkrishan Wrote: Dear Vadim,
I am not that much good about materials, My concern here is
Bronze melting point is about 1000° C and HVOLF coating flame temperature will
be higher than that so does it work?
2. Which is best for bearing housings - Nickel based alloy powders / Tungsten / Chrome carbide ?
3. if we keep 10 microns per pass will be ok?
4. Do i want to increase the robot surface speed?
Regards,
Krishan
Krishan,
First, the temperature of the substrate has nothing to do with the temperature of the flame. The temperature of the component is usually kept below 150°C during HVOF spraying. It is done using a suitable robot program and efficient cooling. Even with plasma spraying (flame temperature > 10,000°C), the substrate does not get hotter than 150°C.
Second, the best material for plain bearings is your bronze (this part was made of bronze for an important reason!). If you want to repair the original part (reduce the inner diameter), then you should rather use similar bronze powder. If you apply a hard carbide coating instead of a bronze coating, the shaft will wear out instead of a sleeve during operation.
10 micron per pass is quite good for all metallic powders, but 5-7 microns would be better for carbide powders.
Regards
Vadim