The use of Al2TiO5 ceramics in diesel engine exhaust systems has been limited by the problem of thermal stress and thermal instability caused by the anisotropic thermal expansion between different materials. In order to avoid this problem, one of the choices is to develop low or zero-level thermal expansion materials that can be used, for example in diesel particulate filters (DPF), in which the original dimensions of the material are maintained, without being affected by thermal shock at high temperatures. For such applications, Al2TiO5 ceramic particulate filters must also have chemical inertness, thermal durability, high filtration efficiency, low pressure drop-, and adequate strength. In particular, DPF ideally combine low thermal expansion, low pressure drop for engine efficiency, high filtration efficiency, high strength, and low production cost. This study examined the publications and patents for thermal stability of Al2TiO5 ceramics with different inorganic materials having a low thermal expansion and high thermal shock resistance, suitable porosity and a narrow pore size distribution suitable for diesel exhaust filtration applications.

Keywords: Al2TiO5; low thermal expansion; thermal shock-resistant; thermal stability; decomposition