Low temperature ceramic processing

[Paul345]

Hello All,

Is there any low temperature processing technique by which one can fabricate ceramic with high mechanical strength? For example I have alumino-silicate crystals with avg. crytsal size of 300 nm, shaped to green body and the limit of temperature for processing is 900 °C.

I am trying to use amorphous silica with 40 nm particle size and then sintered it to 900 °C but results are not good. Does someone know what is melting point curve of silica/alumina with particle diameter?

Thanks

 

[davefitz]

how high is high? Geopolymers can be constructed with "high " strength at temperatures below 100 C. May need to add fibers for notch toughness . Reports are that China is using Geopolymers for the ablative coating of their space shuttle.

"Nobody expects the Spanish Inquisition! "

 

[Paul345]

sintering temperature can go up to maximum 900 °C. and the temperature for normal operating use is 500 °C maximum!

 

[IRstuff]

Have you considered:

http://www.electroscience.com/ceramictapesystems.html

http://www2.dupont.com/MCM/en_US/assets/downloads/prodinfo/951LTCCGreenTape.pdf

TTFN
faq731-376

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