Posted by Gordon England on September 16, 2003 at 00:43:31:
In Reply to: coating titanium oxide TiO2 posted by Leo on September 15, 2003 at 08:00:58:
: Dear sir,
: I'm doing a research project on coating TiO2 by thermal spray process. Will there be any useful information? I'm expecting to find someway spray nano-TiO2 powder on substrate without phase change.
: Thanks.
: regards,
: Leo
Hi Leo
For clarification, nano sized powders are normally too fine for thermal spraying (micro sized powders are used). To spray nano materials they need to be agglomerated into micro sized particles.
With ceramics like titanium dioxide it is necessary during spraying to get the particles near or above their melting point, hence phase changes (anatase to rutile). With nano TiO2 agglomerated particles it is possible to form coatings containing some original nano crystal phase as unmelted particles, but it would be very difficult to form a coating consisting purely of unmelted particles. A lower melting point binder with nano-TiO2 may be worth consideration.
The following links may be of interest:
http://www.altairnano.com/main_content/DevProj_TSGP.html
http://www.scientific.net/0-87849-923-7/288.htm
Regards Gordon
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