Posted by Gordon England on May 11, 2003 at 19:16:32:
In Reply to: Re: Grinding and polishing of Ceramic coating sprayed by plasma posted by Jian Pu on May 10, 2003 at 23:55:24:
: : : Who can give me some idea about how to grind and polish the Al2O3+TiO2 plasma sprayed ceramic coating in concave surface? workingpiece was yarn guide wheel.
: : : they were without precise dimension requirement. But we hope to improve the efficiency in grinding.
: : : I appreciate if I can get reply.
: : Hi Jian
: : What grinding and polishing methods have you tried and what finish or texture do you require?
: : Normally, diamond grinding initially with 150 grit wheels are recommended, but with your application it may be worth considering a brushing method particularly if dimensional or flatness are not important factors.
: : Regards Gordon
: Hi Gordon
: The requirement of finish is Ra 0.3 to 0.6 for Al2O3+13TiO2 coating with layer thickness from 150 to 250 um. Ra 1.2 to 1.6 for Cr2O3 coating with layer thickness form 100 to 150 um.
: Regards
: Jian Pu
Hi Juan
Brushing or flapper wheel techniques might work here particularly for the chromium oxide coating.
The finish achieved using brushing techniques depends somewhat on the powder grade used and the as-sprayed texture.
Have you referred to the powder manufacturer/supplier product data sheets. These sometimes give guidance on finishing.
Regards Gordon
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