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안석헌,정윤중,염희남,이종민 明知大學校 産業技術硏究所 1991 産業技術硏究所論文集 Vol.10 No.-
Stoichiometric mullite powder was prepared with Al(OH)₃, which was synthesized from Al₂(SO₄)₃·18H₂O and SiO₂, which was hydrolysised from TEOS(Al₂O₃:SiO₂=3 : 2 mole%), the sintered body of only mullite and the Y₂O₃ added mullite body were prepared and it's properties were detected. The results are follows. Crystalized mullite begins to founded from 1200 calaination and Well-Crystalzed mullite forms from the calcination temperature, 1300℃ . Crystal grains of mullite is accicular, and its relative density and bending strength of mullite ceramics which is sintered at 1650℃ are 92% and 180Mpa, respectively. As Y₂O₃ addtion the bending strength can be increased to 220MPa, because Y₂O₃ distribute and fill the vacancies of accicular mullite grain boundaries.