Mullite bodies and methods of forming mullite bodies
AssigneeThe Dow Chemical Company
InventorsSten A. Wallin, Arthur R. Prunier, Jr., John R. Moyer
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Abstract
A mullite composition is comprised substantially of mullite grains that are essentially chemically bound wherein the composition has at least two adjoining regions that have substantially different microstructures. The composition may be produced by forming a mixture of one or more precursor compounds having the elements present in mullite; shaping the mixture into a porous green shape applying a nucleation control agent to a portion of the porous green shape and then heating the porous green shape under an atmosphere and to a temperature sufficient to form the mullite composition.
Claims12
A method for preparing a mullite composition comprising,
- a) forming a mixture of one or more precursor compounds having the elements present in mullite,
- b) shaping the mixture into a porous green shape,
- c) applying a nucleation control agent that either suppresses or accentuates the nucleation of mullite to a portion of the porous green shape, and
- d) heating the porous green shape of step (c) under an atmosphere and to a temperature sufficient to form a mullite composition comprised substantially of mullite grains that are essentially chemically bound, wherein the composition has at least two adjoining regions that have substantially different microstructures.
Dependencies are inferred from the claim text.