Influence of melting temperature on morphology of primary mullite in SiO2-Al2O3 system

H. Nakae, S. Nakano, Makoto Yoshida

    Research output: Contribution to journalArticle

    8 Citations (Scopus)

    Abstract

    A series of melting and solidification experiments were carried out using high-purity SiO2 and Al2O3 powders as the starting materials. The effect of melting temperature on the morphology of the primary mullite was investigated. The following conclusions were made: 1) The morphology of the primary mullite went through five stages as the melting temperature increased; massive, fibrous, faceted dendritic, feathery and fine feathery structures. These phenomena can be explained based on the number of effective nuclei in the melt. 2) The fibrous mullite grew from mullite precursors formed in the melt. Under highly supercooled conditions, the fibrous morphology becomes unstable and begins to branch and form a faceted dendritic crystal. 3) When the number of nuclei is extremely small, the mullite nucleated on the rhombic dodecahedron Mo originating from the molybdenum crucible and crystallizes out into a feathered structure.

    Original languageEnglish
    Pages (from-to)1163-1169
    Number of pages7
    Journalmaterials transactions, jim
    Volume36
    Issue number9
    Publication statusPublished - 1995 Sep

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    Mullite
    Melting point
    melting
    dendritic crystals
    nuclei
    crucibles
    solidification
    molybdenum
    temperature
    purity
    fine structure
    Molybdenum
    Crucibles
    Powders
    Solidification
    Melting
    aluminosilicate
    Crystals
    Experiments

    ASJC Scopus subject areas

    • Engineering(all)

    Cite this

    Influence of melting temperature on morphology of primary mullite in SiO2-Al2O3 system. / Nakae, H.; Nakano, S.; Yoshida, Makoto.

    In: materials transactions, jim, Vol. 36, No. 9, 09.1995, p. 1163-1169.

    Research output: Contribution to journalArticle

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    abstract = "A series of melting and solidification experiments were carried out using high-purity SiO2 and Al2O3 powders as the starting materials. The effect of melting temperature on the morphology of the primary mullite was investigated. The following conclusions were made: 1) The morphology of the primary mullite went through five stages as the melting temperature increased; massive, fibrous, faceted dendritic, feathery and fine feathery structures. These phenomena can be explained based on the number of effective nuclei in the melt. 2) The fibrous mullite grew from mullite precursors formed in the melt. Under highly supercooled conditions, the fibrous morphology becomes unstable and begins to branch and form a faceted dendritic crystal. 3) When the number of nuclei is extremely small, the mullite nucleated on the rhombic dodecahedron Mo originating from the molybdenum crucible and crystallizes out into a feathered structure.",
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