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AssigneeAir Products and Chemicals, Inc.
InventorsPaul N. Dyer, Vincent L. Magnotta, Robert E. Stevens
Estimating the term…
A method for producing a protective coating on the surface of a carbonaceous substrate is described. A substantially uniform coating of a liquid or solid precursor material is provided on the surface of the substrate. The precursor material is one which has boron-oxygen bonds and is substantially non-reactive with the substrate at a first relatively low temperature and is capable of reacting with the substrate at a second temperature which is substantially higher than the first temperature. The substrate is then raised to the second temperature to react the coating with the substrate to form a porous region of substantially uniform depth in the substrate surface. This region contains interconnecting interstices and boron carbide. The interconnecting interstices are then at least partially filled with a glass forming material such as boron, boron oxide, boron carbide, silicon, silicon alloy, silicon dioxide, silicon nitride, silicon oxynitride, germania, and mixtures thereof. A refractory coating may then be deposited on the filled layer. Also described is a coated article produced in accordance with the described method.
A method for producing a protective coating on the surface of a carbonaceous substrate, comprising, providing a substantially uniform coating of liquid or solid precursor material on the substrate surface at a first temperature in the range of about 0.degree. C. to about 100.degree. C., said precursor material being one having boron-oxygen bonds and being substantially non-reactive with the substrate at the first temperature and being capable of reacting with the substrate at a second temperature in the range of about 1200.degree. C. to about 3000.degree. C., raising the substrate to the second temperature to etch and to react the coating with the substrate to form a porous region of substantially uniform depth in the substrate surface containing interconnecting interstices and boron carbide, wherein said porous region has a void volume of up to about 50 per cent of the volume originally occupied by the carbonaceous substrate, and at least partially filling said interconnecting interstices with a glass forming material.
A coated carbon body having improved resistance to high temperature oxidation comprising:
A coated carbon body having improved resistance to high temperature oxidation comprising:
A coated carbon body having improved resistance to high temperature oxidation comprising:
Dependencies are inferred from the claim text.