Nanoceramics availability

Hello,
Does anyone know where ceramic powders having particle size around 20-200 nm could be purchased? Especially silicon carbide, titanium
carbide, tungsten carbide and possibly also chromium oxide would be of interest.
With best regards, Jari
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www.thomasregister.com, search for "ceramic powder". 12 hits. Try Aveka.
http://www.aveka.com /
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