HIGH-TEMPERATURE STRENGTH NANOMODIFIED QUARTZ CERAMIC Russian patent published in 2012 - IPC C04B35/14 B82B3/00 

FIELD: chemistry.

SUBSTANCE: invention relates to the technology of producing modified ceramic materials based on high-temperature strength quartz glass and can be used to make articles for different purposes. The nanomodified quartz ceramic, which contains a porous ceramic base from quartz glass grains and a modifying additive from aluminium oxide, has the base in form of calcined quartz ceramic or an article made therefrom with open porosity of 7-14%, obtained via aqueous slip casting from a polydispersed suspension with grain size from 0.1 to 500 mcm, with 0.1-5.0 mcm particle content of 20-30% and 60-500 mcm particle content of 2-10%. The modifying additive in the material is α-Al₂O₃ nanoparticles in amount of 1.0-2.5 wt %, which are embedded in the boundary zones of quartz glass grains by mass-transfer. The α-Al₂O₃ nanoparticles are obtained by saturating the ceramic base with an aqueous solution of an aluminium salt Al(NO₃)₃·9H₂O₃, drying and pyrolysis at temperature 400-600°C.

EFFECT: high-temperature strength of the quartz ceramic while preserving dielectric and thermophysical properties.

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