Introduction to aluminum titanate ceramics

Aluminum titanate ceramic refers to a synthetic ceramic material composed of 1 mol alumina and 1 mol titanium oxide. Melting point is 1860℃, belonging to orthorhombic crystal system. The main characteristics are low thermal expansion coefficient (0.87×10-6K-1), low thermal conductivity [1～2W/(m·K)], high temperature resistance (can work at 1400℃ for a long time), good resistance Corrosion (resistance to the corrosion of refractory metals such as copper, aluminum, and molten iron), and can withstand the thermal shock of the molten iron environment from room temperature to 1400°C. Generally, it can be formed by dry pressing, casting and extrusion, and sintered at 1400-1600°C in an oxidizing atmosphere. It can be used to prepare thermocouple protection tubes that continuously measure the temperature of molten metal, or be prepared into honeycomb ceramics for automobile exhaust purification, as well as engine exhaust pipe linings and piston crowns.

Aluminum titanate ceramics belong to the pseudobrookite crystal of the orthorhombic system. The average thermal expansion coefficient is 9.5E-6/℃, which is a well-known material with a low thermal expansion coefficient. Aluminum titanate will not show devitrification during repeated and long-term use, and can be used at higher temperatures (1460℃) , It can also adapt well to the oxidation problem at high temperature, so it has broad application prospects, but it is easy to crack during high temperature calcination, and its mechanical strength is poor.