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.
Highlights
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 × 10−6 K−1
The decomposition free Al2TiO5-MgTi2O5 ceramics is expected for variety of high temperature applications including diesel particulate filters
Most of ceramics for high temperature applications such as refractory, ceramics filters and so on are damaged by a rapid temperature change, which largely reduces the usability and productivity because the heating and cooling rate should be less than the critical heating/cooling rates of the thermal shock [1]
Summary
Most of ceramics for high temperature applications such as refractory, ceramics filters and so on are damaged by a rapid temperature change, which largely reduces the usability and productivity because the heating and cooling rate should be less than the critical heating/cooling rates of the thermal shock [1]. Different degree of thermal expansion along with the thermal gradient in the ceramics causes such thermal shocks, low-expansion ceramics are widely studied to reduce the energy usages and to improve the productivity. Many applications as refractory materials have been expected for the AT ceramics. The use of AT ceramics as refractory is, restricted because of the low fracture strength and thermal decomposition in the temperature range from 800 ̊C to 1280 ̊C. The present authors have reported that the AT ceramics doped with alkali feldspar ((Nay,K1−y)AlSi3O8, y
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