Posted by Karlos (22.214.171.124) on 21:13:23 23/06/05
In Reply to: Re: APS NiCrAlY coatings posted by Gordon England
: : Hi, I need help
: : I am new in metal spray.
: : I have problem with NiCrAlY bond coat. I use F1 gun (APS) and I have big problem with globular oxidation.
: : I used a typical parameter set from the spraying manual. I don't know which parameters are necessary to change
: : to avoid globular oxidation in the coating. I am distressful and I don't know what to do to improve my process.
: : Can anybody help me please?
: : Thank you in advance.
: Hi Karlos
: Is it possible to see a photomicrogaph of the coating showing the problem? Very often these problems are not actually caused by the plasma gun settings, but through powder fines and spray debris being entrained in the coating. Check your powder. Slight changes in spray angle, traverse speeds, use of air jets may help.
: Regards Gordon
How can I place photomicrogaph to be possible to see it? Is there any place or link for picture sending?
By the way, I changed sample location (sample was used for metalurgical control of microstructure) and bond coat quality is much better. I think the problem was caused by powder fines entrained in the coating. I need to verify this finding in production.
Thank you for your advice.
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