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Preparation of Short Mullite Fibers from Kaolin via the Addition of Foaming Agents
Author(s) -
Li Keqin,
Shimizu Tadao,
Igarashi Kaoru
Publication year - 2001
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2001.tb00689.x
Subject(s) - mullite , calcination , dissolution , materials science , fiber , chemical engineering , sodium , hydrofluoric acid , phosphate , composite material , matrix (chemical analysis) , mineralogy , chemistry , metallurgy , organic chemistry , catalysis , ceramic , engineering
Short mullite fibers were fabricated by adapting the kneading–drying–calcination (KDC) process. The effect of foam forming on the formation of mullite fiber from kaolin via the KDC process, with the addition of a foaming agent, was examined. In the present study, doped sodium phosphates promoted the growth of mullite fiber and the formation of a glass matrix—effects that were ascribed to the P 2 O 5 and Na 2 O components, respectively, of the sodium phosphates. In particular, the addition of sodium phosphates greatly reduced the treatment time that was required for dissolution of the glass matrix in hydrofluoric acid. The addition of 10 mass% of sodium dihydrogen phosphate and calcination at 1500°C for 10 h were the optimum conditions for a short treatment time and the formation of long fibers.