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Preparation, Structure, and Properties of Thermally and Mechanically Improved Aluminum Titanate Ceramics Doped with Alkali Feldspar
Author(s) -
Takahashi Masahide,
Fukuda Masahiro,
Fukuda Masaaki,
Fukuda Hisato,
Yoko Toshinobu
Publication year - 2002
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.1151-2916.2002.tb00573.x
Subject(s) - materials science , sintering , ceramic , titanate , feldspar , doping , aluminium , alkali metal , mineralogy , thermal decomposition , composite material , chemical engineering , metallurgy , quartz , chemistry , optoelectronics , organic chemistry , engineering
Aluminum titanate (AT) ceramic materials doped with alkali feldspar ((Na 0.6 K 0.4 )AlSi 3 O 8 ) have been prepared. These ceramics exhibited high sinterability, large resistance to thermal decomposition, and large flexure strength. The existence of liquid‐phase feldspar at sintering temperatures promoted the formation of AT ceramics as the sintering agent. It was considered that silicon ions substituting for aluminum ions at the surface of AT crystal grains lowered the surface energy and hindered the diffusion of Ti 4+ and Al 3+ , giving rise to the large resistance to thermal decomposition. As a result, doping with alkali feldspar was found to effectively improve the mechanical and thermal properties of AT ceramics.