Investigating the effect of temperature an‎d composition on phases an‎d microstructure of aluminum titanate by injection molding method

1/1/1900 12:00:00 AM

Aluminum titanate (Al2TiO5:AT) is a ceramic material with various applications. These ceramics have low thermal conductivity, very high thermal shock resistance, excellent corrosion resistance, an‎d non-penetration to molten metals an‎d glass. In this research, aluminum titanate ceramic was prepared by injection molding an‎d reactive sintering technique. To prepare aluminum titanate powder, Al2O3, an‎d TiO2 powders with a weight ratio of 56:44 along with 2 an‎d 4 weight percent of MgO powder were jar milled for 10 hours to investigate the effect of this material as an additive on the properties of aluminum titanate material. In injection molding, 65% by weight of powder an‎d 35% by weight of binder were used to prepare feedstock. After injection, the parts were placed in a layer of alumina ceramic blanket, an‎d the thermal debonding method was used to debind the parts. Then, these parts were sintered at temperatures of 1300, 1400, an‎d 1500 ºC for 2 hours in an air atmosphere. The phase composition of the produced product was determined using XRD analysis. The results indicated the formation of aluminum titanate (Al2TiO5) at temperatures of 1300, 1400, an‎d 1500 ºC an‎d increasing its stability at high temperatures. Similarly, to investigate the effect of increasing the percentage of MgO addition on the stability of aluminum titanate, a scanning electron microscope (SEM) was used to investigate the particle distribution, microstructure, an‎d thermal stability of AT an‎d the mechanical properties of the samples such as overall density, porosity percentage, an‎d bending strength were investigated. The results showed the adverse effect of temperature increase on flexural strength, but the samples containing the additive had higher flexural strength than the sample without the additive.

تيتانات آلومينيوم , قالب گيري تزريقي

Aluminum titanate , Injection molding

Fazeleh Rahmani

Dr. Hossein Sarpoolaki