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Porosity problem - HVOF |
Posted by: thaisrms - 08-27-2020, 04:26 AM - Forum: Surface Engineering Threads
- Replies (6)
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Dear,
my company had a porosity problem in the carbide coatings (tungsten, chromium, tungsten + chromium, etc.) by an air-cooled HVOF system. This problem started recently and we were unable to resolve it. We believed it was a problem with the equipment calibration, but due to the corona virus, it was not possible to bring a technician to our company.
We then decided to purchase a new MEC MDJ2700 water-cooled equipment - propylene.
We used the following parameters to apply the woka3302 powder (WC 10Ni):
O2: 250 lpm, 10 bar
C3H6: 80 lpm, 8 bar
Air: 390 lpm, 9 bar
N2: 20 lpm, 9 bar
Feed rate: 35 g / min (4 rpm)
Distance: 240 mm
When we performed the penetrating liquid test, the result was the same as in the past: no crack, but less than 30 seconds later the piece was COMPLETELY red.
Our compressed air is completely dry and free of impurities (network of activated carbon filters recently added) and the fuel gas cannot be agreed since the equipment has a vaporizer that is kept at 55 degrees celsius.
Do any of you have any idea what's going on?
Sorry for my english, hope you can understand.
Thank you very much for your attention.
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Blemish in flame sprayed self fluxing nickel based coating |
Posted by: etelatal - 07-22-2020, 08:12 AM - Forum: Surface Engineering Threads
- Replies (4)
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PIC
Hi guys, this is a flame sprayed Nickel boron coating that has been post treated in a sintering furnace. This weird blemish appeared during sintering (not sure if the image is visible). The powder is metco 16C, the surface has been grit blasted before spraying. Base material is duplex steel. Any ideas as to what this might be or what is could be the cause of it?
br.
Olli
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