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

H. Nakae, S. Nakano, M. Yoshida

研究成果: Article

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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.

元の言語English
ページ(範囲)1163-1169
ページ数7
ジャーナルMaterials Transactions, JIM
36
発行部数9
DOI
出版物ステータスPublished - 1995 1 1

ASJC Scopus subject areas

  • Engineering(all)

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