C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
117/128
C04B 41/87 (2006.01) C04B 41/45 (2006.01) C04B 41/50 (2006.01) C04B 41/52 (2006.01) C04B 41/81 (2006.01) C04B 41/89 (2006.01) C23C 20/00 (2006.01)
Patent
CA 1338974
A method for producing a protective coating on the surface of a carbonaceous substrate is described. A substantially uniformed 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.
606642
Dyer Paul Nigel
Magnotta Vincent Louis
Stevens Robert Edward
Air Products And Chemicals Inc.
Gowling Lafleur Henderson Llp
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