Oxidation resistant carbon and method for making same
First Claim
1. A coated carbon body having improved resistance to high temperature oxidation comprising:
- a carbon body,said body having a converted porous layer formed by etching and reacting said carbon body with boron oxide, said converted layer containing interconnecting interstices and boron carbide formed by the reaction of boron oxide and said carbon body anda glass forming coating at least a portion of which is within said converted layer, said coating comprising compounds selected from the group consisting of silicon nitride, silicon oxynitride and mixtures thereof.
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Abstract
A coated carbon body having improved resistance to high temperature oxidation and a method for producing the coated carbon body are described. The coated carbon body comprises a carbon body, an intermediate glass forming coating and an outer refractory coating on the intermediate coating. The body has a converted porous layer formed by etching and reacting the body with boron oxide and the resulting converted layer contains interconnecting interstices and boron carbide formed by the reaction of the boron oxide and the carbon body. The method comprises contacting a carbon body with boron oxide at an elevated temperature sufficient to cause the reaction between the carbon body and boron oxide to form a converted porous layer which contains interconnecting interstices in the body and boron carbide and then applying the glass forming coating over the converted layer. Preferably an outer refractory coating is applied over the glass forming coating. The glass forming coating comprises compounds selected from the group consisting of silicon nitride, silicon oxynitride and mixtures thereof. Additionally, both the refractory outer coating and the glass forming coating can contain compounds selected from the group consisting of silicon nitride, silicon oxynitride, and mixtures thereof.
36 Citations
30 Claims
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1. A coated carbon body having improved resistance to high temperature oxidation comprising:
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a carbon body, said body having a converted porous layer formed by etching and reacting said carbon body with boron oxide, said converted layer containing interconnecting interstices and boron carbide formed by the reaction of boron oxide and said carbon body and a glass forming coating at least a portion of which is within said converted layer, said coating comprising compounds selected from the group consisting of silicon nitride, silicon oxynitride and mixtures thereof. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A coated carbon body having improved resistance to high temperature oxidation comprising:
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a carbon body, said body having converted porous layer formed by etching and reacting said carbon body with boron oxide, said converted layer containing interconnecting interstices and boron carbide formed by the reaction of boron and said carbon body, a boron-containing intermediate glass forming coating within said converted layer, said intermediate coating comprising compounds selected from the group consisting of silicon nitride, silicon oxynitride and mixtures thereof, and an outer refractory coating on said intermediate coating. - View Dependent Claims (8, 9)
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10. A coated carbon body having improved resistance to high temperature oxidation comprising:
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a carbon body, said body having converted porous layer formed by etching and reacting said carbon body with gaseous boron oxide, said converted layer containing interconnecting interstices and boron carbide formed by the reaction of boron and said carbon body, a boron and silicon-containing intermediate glass forming coating within said converted layer, said intermediate coating comprising compounds selected from the group consisting of silicon nitride, silicon oxynitride and mixtures thereof, and an outer refractory coating on said intermediate coating - View Dependent Claims (11, 12)
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13. A method for the manufacture of a coated carbon body having improved resistance to high temperature oxidation comprising:
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providing a carbon body, contacting said carbon body with boron oxide at an elevated temperature sufficient to cause reaction between the carbon body and the boron oxide thereby forming a converted porous layer containing interconnecting interstices in said body, which layer contains boron carbide, applying a glass forming coating over said converted layer, said glass forming coating comprising compounds selected from the group consisting of silicon nitride, silicon oxynitride and mixtures thereof. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A method for the manufacture of a coated carbon body having improved resistance to high temperature oxidation comprising:
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providing a carbon body, contacting said carbon body with gaseous boron oxide at an elevated temperature sufficient to cause reaction between the carbon body and the boron oxide thereby forming a converted porous layer containing interconnecting interstices in said body, which layer contains boron carbide, applying an intermediate glass forming coating over said converted layer, said intermediate coating comprising silicon or a silicon-containing compound, subjecting said body with a nitriding atmosphere to convert said silicon or silicon-containing compound to silicon nitride, and applying an outer refractory coating over said intermediate coating. - View Dependent Claims (26, 27, 28, 29, 30)
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Specification