Patent US5286565A successfully refreshed from Google Patents.
US5286565A
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Oxidation resistant carbon and method for making same
Assignee: Air Products and Chemicals Inc
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Filing: 1987-12-03
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Granted: 1994-02-15
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Expires: 2007-12-03
Abstract
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.
Inventors
- 👤 Robert A. Holzl
- 👤 Vincent L. Magnotta
- 👤 Paul N. Dyer
- 👤 Howard P. Withers, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:15
CPC Classifications
C; C23; C23C; C23C8/00; C23C8/06; C23C8/28; C04; C04B; C04B41/00; C04B41/45; C04B41/50; C04B41/5053; C04B41/5057; C04B41/52; C04B41/53; C04B41/5338; C04B41/5346; C04B41/80; C04B41/81; C04B41/85; C04B41/87; C04B41/89; C04B41/91; C09; C09K; C09K13/00; C09K13/04; C09K13/10; C23C16/00; C23C16/02; C23C16/0272; C23C16/22; C23C16/24; C23C16/28; C23C16/30; C23C16/32; C23C16/34; C23C16/38; C23C16/40; C23C8/80; Y; Y10; Y10T; Y10T428/00; Y10T428/30
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
86 words
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 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.
Claim 2
Dependent Claim
86 words
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 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.
Claim 3
Dependent Claim
18 words
A coated body in accordance with claim 1 wherein a refractory coating is on the glass forming coating.
Claim 4
Dependent Claim
35 words
A coated body in accordance with claim 2 wherein the refractory coating comprises carbides, borides or nitrides of silicon, zirconium, tantalum, hafnium, niobium and titanium, silicon oxynitride, and aluminum boride or nitride or mixtures thereof.
Claim 5
Dependent Claim
23 words
A coated body in accordance with claim 3 wherein the converted layer has a depth of between about 3 and about 250 microns.
Claim 6
Dependent Claim
31 words
A coated body in accordance with claim 4 wherein the converted layer has a void volume of up to about 50 percent of the volume originally occupied by the carbon layer.
Claim 7
Dependent Claim
21 words
A coated body in accordance with claim 1 wherein the glass forming coating partially fills the interstices of said converted layer.
Claim 8
Dependent Claim
88 words
A coated carbon body having improved resistance to high temperature oxidation comprising: 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.
Claim 9
Dependent Claim
88 words
A coated carbon body having improved resistance to high temperature oxidation comprising: 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.
Claim 10
Dependent Claim
15 words
A coated body in accordance with claim 7 wherein the refractory coating is silicon nitride.
Claim 11
Dependent Claim
15 words
A coated body in accordance with claim 7 wherein the refractory coating is silicon oxynitride.
Claim 12
Dependent Claim
91 words
A coated carbon body having improved resistance to high temperature oxidation comprising: 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
Claim 13
Dependent Claim
91 words
A coated carbon body having improved resistance to high temperature oxidation comprising: 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
Claim 14
Dependent Claim
15 words
A coated body in accordance with claim 10 wherein the refractory coating is silicon nitride.
Claim 15
Dependent Claim
15 words
A coated body in accordance with claim 10 wherein the refractory coating is silicon oxynitride.
Claim 16
Independent Claim
90 words
A method for the manufacture of a coated carbon body having improved resistance to high temperature oxidation comprising: 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.
Claim 17
Independent Claim
90 words
A method for the manufacture of a coated carbon body having improved resistance to high temperature oxidation comprising: 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.
Claim 18
Dependent Claim
19 words
A method in accordance with claim 13 wherein an outer refractory coating is applied over said glass forming coating.
Claim 19
Dependent Claim
33 words
A method in accordance with claim 13 wherein the elevated temperature is at least about 1500° C. to cause said converted layer to reach a depth of between about 2 and 250 microns.
Claim 20
Dependent Claim
30 words
A method in accordance with claim 13 wherein said converted layer has a void volume of up to about 50 percent of the volume originally occupied by the carbon layer.
Claim 21
Dependent Claim
34 words
A method in accordance with claim 13 wherein the glass forming coating comprises a primary glass forming species selected from boron, boron carbide, boron oxide, silicon, silicon alloys, silicon dioxide, germania, and mixtures thereof.
Claim 22
Dependent Claim
37 words
A method in accordance with claim 13 wherein said glass forming coating also contains borides and oxides of zirconium, aluminum, magnesium, hafnium, titanium, carbides of zirconium, hafnium, titanium, nitrides of zirconium, hafnium, titanium, silicon and mixtures thereof.
Claim 23
Dependent Claim
18 words
A method in accordance with claim 13 wherein the glass forming coating is applied by chemical vapor deposition.
Claim 24
Dependent Claim
18 words
A method in accordance with claim 14 wherein the outer refractory coating is applied by chemical vapor deposition.
Claim 25
Dependent Claim
31 words
A method in accordance with claim 14 wherein the outer refractory coating comprises carbides, borides or nitrides of silicon, zirconium, tantalum, hafnium, niobium, titanium, aluminum boride or nitride or mixtures thereof.
Claim 26
Dependent Claim
14 words
A method in accordance with claim 14 wherein the refractory coating is silicon nitride.
Claim 27
Dependent Claim
14 words
A method in accordance with claim 14 wherein the refractory coating is silicon oxynitride.
Claim 28
Dependent Claim
17 words
A method in accordance with claim 13 wherein the glass forming coating is applied by sol-gel technology.
Claim 29
Independent Claim
109 words
A method for the manufacture of a coated carbon body having improved resistance to high temperature oxidation comprising: 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.
Claim 30
Independent Claim
109 words
A method for the manufacture of a coated carbon body having improved resistance to high temperature oxidation comprising: 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.
Claim 31
Dependent Claim
32 words
A method in accordance with claim 25 wherein the nitriding atmosphere is selected from the group consisting of N 2 , NH 3 , N 2 H 4 , and mixtures thereof.
Claim 32
Dependent Claim
29 words
A method in accordance with claim 26 wherein said carbon body is subjected to the nitriding atmosphere at temperatures in the range of about 1350° to about 1500° C.
Claim 33
Dependent Claim
16 words
A method in accordance with claim 27 wherein the nitriding atmosphere contains small amounts of hydrogen.
Claim 34
Dependent Claim
29 words
A method in accordance with claim 25 wherein the nitriding atmosphere contains oxygen or an oxygen-containing compound to convert the silicon or silicon-containing compound to an oxynitride of silicon.
Claim 35
Dependent Claim
17 words
A method in accordance with claim 29 wherein the oxygen-containing compound is H2O or CO/CO 2 .
References Cited (Backward Citations)
US4515860A
Cited
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1997-02-14 | 1997-08-16 | 1998-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-02-14 | 2001-08-16 | 2002-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-02-14 | 2005-08-16 | 2006-02-15 | $7700.00 | Window Closed / Lapsed |