A MULLITE BODY AND METHOD OF FORMING THE MULLITE BODY

摘要

Mixing together precursors comprising a plurality of crystals, having a porosity of 55% or greater and having an average aggregate particle size of less than or equal to about 3 microns measured using a particle size analyzer; Heating the green product to a first temperature in air to dry the greenware and form a calcineware; Heating the calcined product in a silicon tetrafluoride atmosphere to form fluorotopaz; Heating to a second temperature such that a mullite structure is formed, wherein at least about 70% of the crystals are less than or equal to about 3 microns of the average diameter of the plurality of crystals A mullite object having a crystal diameter belonging to the mullite.