Gas impermeable glaze for sealing a porous ceramic surface
AssigneeSandia Corporation
InventorsScott T. Reed, Ronald G. Stone, Tina M. Nenoff, Daniel E. Trudell, Steven G. Thoma
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Abstract
A process for fabricating a gas impermeable seal on a porous ceramic surface using a thin, glass-based, pinhole free glaze. The process can be used to fabricate gas impermeable end seals on porous alumina tubes used as filter media. The porous alumina tubes can have an inorganic microporous thin film separation membrane on the inner surface, which can be used for high temperature gas separation processes.
Claims28
A microporous, inorganic thin film membrane disposed on the inner surface of a porous alumina tube, wherein the tube comprises at least one gas impermeable end seal, wherein the end seal comprises a borosilicate glass formulated to have a coefficient of thermal expansion that matches the coefficient of thermal expansion of alumina.
A process for sealing the surface of a porous ceramic body with a thin, gas impermeable, glass glaze, comprising:
- a) mixing glass particles with a solvent to make a smooth slurry;
- wherein the glass particles are suspended in the slurry;
- b) depositing a thin layer of the slurry on the surface of the porous ceramic body;
- c) removing the solvent by drying with heat;
- and
- d) firing the coated body at a temperature sufficient to melt and fuse the glass particles together to make a continuous, pinhole free, gas impermeable glaze that seals the surface of the porous ceramic body, wherein the glaze does not contain Na2O, K2O, PbO or CaO low melting point oxides.
Dependencies are inferred from the claim text.