Protective internal coatings for porous substrates
AssigneeApplied Thin Films, Inc.
InventorsSankar SAMBASIVAN, Vikram S. KAUL, Francis R. CHAPMAN
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Abstract
A material contains open pores in which the channels and pores that are internally coated with at least one layer of phosphorus-containing alumina. Such material is formed by infiltrating a porous material one or more times with a non-colloidal, low-viscosity liquid coating precursor, drying, and curing the coating precursor to form a phosphorus-containing alumina layer within pores of the material.
Claims20
A material comprising a porous substrate containing open pores and channels and comprising interconnected mesopores and micropores, in which the pores and channels are internally coated with at least one layer of phosphorus-containing alumina.
A method to form a material having an internally coated porous substrate surface comprising:
- a) contacting a porous substrate containing open pores and channels and comprising interconnected mesopores and micropores with a non-colloidal, low viscosity solution, having a viscosity lower than 100 centistokes, of a phosphorus-containing alumina coating precursor, formed by combining solutions of an aluminum salt and a phosphate ester, such that the coating precursor infiltrates and internally coats the open pores and channels;
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- b) drying and curing the phosphorus-containing alumina coating precursor to form a layer of phosphorus-containing alumina onto internal surfaces of the pores.
A method to protect a porous substrate surface containing open pores from environmental conditions comprising:
- a) contacting a porous substrate containing open pores and channels and comprising interconnected mesopores and micropores under external pressure conditions with a non-colloidal, low viscosity solution of a phosphorus-containing alumina coating precursor, formed by combining solutions of an aluminum salt and a phosphate ester, such that the coating precursor infiltrates and internally coats the open pores;
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- b) drying and curing the phosphorus-containing alumina coating precursor to form a continuous layer of phosphorus-containing alumina onto internal surfaces of the pores.
Dependencies are inferred from the claim text.