Effect of TiO2 on the Sinterability and Microstructure of Mullite Sythesized from Al（OH）3 and SiO2

1IntroductionAs an ideal raw material for refractories produc-tion,mullite has been widely used in refractories in-dustry.But little amount of natural mullite has beenfound so that almost all of the mullite used now has tobe synthesized from natural miner…

Effect of TiO2 on the Sinterability and Microstructure of Mullite Sythesized from Al(OH)3 and SiO2

Using analytical pure Al(OH)_3, SiO_2, TiO_2 as raw materials, effect of TiO2 on the sinterability and microstructure of mullite synthesized from Al(OH)_3 and SiO_2 was investigated in this paper by XRD,SEM and EPAX. Results show that TiO_2 can promote the sintering property when the amount is below 6%, the sinterability of samples becomes better with the increase of the amount of TiO2, microstructure of samples densify gradually, and the best effect can be achieved when the amount of TiO_2 is 6%. It was shown by XRD analysis that no Al2TiO5 present when the amount of TiO_2 is below 6%, TiO_2 existed in the form of solid-solution and glass phase; When the amount of TiO_2 is up to 6%, the sinterability of samples becomes worse with the increase of TiO_2 added, microstructure of samples began to loosen, Al_2TiO_5 can be observed in samples and its amount increase with the increase of TiO_2.