TITLE:
Decomposition Free Al2TiO5-MgTi2O5 Ceramics with Low-Thermal Expansion Coefficient
AUTHORS:
Masahiro Fukuda, Toshinobu Yoko, Masahide Takahashi
KEYWORDS:
Diesel Particulate Filters; Thermal Shock Resistance; Aluminumtitanate; Magnesium Titanate
JOURNAL NAME:
New Journal of Glass and Ceramics,
Vol.3 No.4,
October
23,
2013
ABSTRACT: Solid solutions of (1 - x)Al2TiO5-xMgTi2O5 (x = 0 - 1) doped with alkaline feldspar were prepared. Thermal
decomposition largely depends on the feldspar doping as same as the x value. It was found that decomposition
free ceramics over 500 hours of heat treatment at 1100°C in an ambient
atmosphere could be obtained for the feldspar-doped ceramics at x > 0.5 with a
fracture strength of 33 - 40 MPa and coefficient of thermal expansion of 2.4 - 4.1 ×10-6K-1. A partial decomposition was observed for a compositional range
of around x = 0.75. Both composition of the solid solution and an addition of the
alkaline feldspar contributed synergistically
to improve such thermal and mechanical properties. The decomposition free Al2TiO5-MgTi2O5 ceramics is expected for variety of high temperature applications including
diesel particulate filters.