Compare between Arc-Spraying and HVOF
10-20-2021, 04:17 AM,
#1
Compare between Arc-Spraying and HVOF
Hi everyone,

I compare between Arc-Spraying and HVOF to rebuild wear in the journal bearing areas of generator shaft of steam turbine:

The shaft RPM is 3000
Operating temperature is 90c
Material is 42CrMo4
Hardness required is 37 HRC
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10-20-2021, 06:41 AM,
#2
RE: Compare between Arc-Spraying and HVOF
Hi,
for a sensible repair of a shaft using thermal spraying, you don't need the shaft material, but a different one. If you have HVOF available, the best material for the repair would be a tungsten carbide powder (WC-Co or WC-Co-Cr).
Arc spraying can only be used for shaft repair if it is a seat for rolling bearings. In this case, you can, for example, spray bronze with a Ni-Al bond coat. But when it comes to a plain bearing, the porous coatings produced by means of arc spraying are too weak.
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