Premium
Fabrication of Nitrogen‐Containing Cordierite Ceramics
Author(s) -
Saito Noritaka,
Nishimura ShinYa,
Kawano Michio,
Araki ShinIchi,
Sukenaga Sohei,
Nakashima Kunihiko,
Yasukouchi Toshikazu
Publication year - 2010
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.1551-2916.2010.03736.x
Subject(s) - cordierite , fabrication , ceramic , materials science , chemical engineering , mineralogy , metallurgy , nanotechnology , chemistry , engineering , medicine , alternative medicine , pathology
We have investigated the crystallization behavior of cordierite‐based oxynitride glass prepared by melting a powder mixture of cordierite and silicon nitride. The results indicated that two polymorphs exist: a stable α‐form, which has a low coefficient of thermal expansion, and a metastable μ‐form. The time–temperature–transformation diagram of the crystallization of the α‐form shows a typical C‐shaped curve that has a nose around 1420 K. Above 1373 K, the α‐form can be directly obtained by the isothermal crystallization of the oxynitride glass and the μ‐form inverts to the α‐form at temperatures below 1273 K. We also have fabricated an α‐cordierite ceramic that has a nitrogen content of 1.55 mass%, which is much lower than the content of the batch composition (5 mass%); this is mainly owing to the decomposition reaction of nitrogen in the oxynitride melts and glasses during heat treatment. However, the fabricated nitrogen‐containing α‐cordierite ceramics showed the coefficient of thermal expansion of 10 −7 K −1 , which is comparable with that of the oxide α‐cordierite ceramics. Moreover, Young's modulus of the α‐cordierite ceramics improved with the incorporation of nitrogen.