Ceramics-Silikáty 26, (2) 97 - 105 (1982)

Plate materials composed of aluminosilikate cerumic fibres bonded with alumina or Portland cement with or without the addition of high-silica flue dust of an amorphous structure were heat treated at temperatures up to 1300 °C. The specimens containing alumina cement and silica flue dust show upon heating to above 1100 °C the formation of anorthite and gehlenite besides CA phase. Analogically treated specimens without flue dust were found to contain only the original clinker minerals: CA, CA₂ and small quantities of C₁₂A₇. Specimens on the basis of Portland cement and flue dust contained a certain quantity of wollastonite after heating to temperatures above 800 °C and gehlenite after heating beyond 1000 °C, regardless of the presence of flue dust. Ceramic fibres bonded with alumina and Portland cement and containing silica flue dust are more resistant to corrosion than fibres from the corresponding prepared without the addition of silica flue dust. The ceramic fibres were partly fused at 1300 °C.