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Fabrication of Crack‐Free C12A7 Nano‐Ceramics Composite from Eutectic Glass in the C12A7–CaYAlO 4 System
Author(s) -
Sakamoto Naonori,
Watanabe Tomoaki,
Yoshimura Masahiro
Publication year - 2006
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/j.1744-7402.2006.02089.x
Subject(s) - materials science , crystallization , eutectic system , composite number , composite material , transmission electron microscopy , phase (matter) , fabrication , shrinkage , crystal (programming language) , scanning electron microscope , volume fraction , ceramic , microstructure , chemical engineering , nanotechnology , medicine , chemistry , alternative medicine , organic chemistry , pathology , computer science , engineering , programming language
Crack formation in the C12A7 nano‐composite during crystallization was successfully avoided by using the eutectic glass in the C12A7–CaYAlO 4 system. The crystal phases from the eutectic glass were identified to be C12A7 (major phase) and CaYAlO 4 (minor phase) by X‐ray diffraction and high‐resolution transmission electron microscope. It was indicated that origin of cracks upon crystallization of C12A7 glass was the volume expansion caused by crystallization of C12A7 in the glass and the cracking could be avoided by the volume shrinkage by crystallization of CaYAlO 4 . By using a conventional molding technique, we have also succeeded to fabricate a bulk C12A7 composite with arbitrary shapes.