US4894286A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxidation resistant refractory coated carbon-carbon composites
Assignee: Rohr Inc
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Filing: 1988-11-07
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Granted: 1990-01-16
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Expires: 2008-11-07
Abstract
Abstract An oxygen resistant high temperature composite structure comprises a carbonous matrix and reinforcing high temperature fibers disposed within said matrix, an outer refractory coating covering said matrix, boron, in elemental form and/or as a moiety of a compound dispersed throughout said structure, silicon, in elemental form and/or as a moiety of a compound dispersed throughout said structure, and titanium, in elemental form and/or as a moiety of a compound dispersed throughout said structure, said silicon and said boron oxidizing when exposed to a high temperature, oxidizing environment to form silicon oxide and boron oxide, and said titanium forming titanium oxide which stabilizes the molten phase of the boron oxide. Microcracks which form in the refractory coating are sealed by a molten glass which forms from oxidation of the boron, silicon and titanium, thereby preventing oxidation degradation of the underlying matrix.
Inventors
- 👤 Paul E. Gray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:24
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B35/00; C04B35/622; C04B35/64; C04B35/65; C04B35/71; C04B35/78; C04B35/80; C04B35/83; C04B41/45; C04B41/50; C04B41/5053; C04B41/5093; C04B41/5096; C04B41/80; C04B41/81; C04B41/85; C04B41/87; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/38; C04B2235/3804; C04B2235/3817; C04B2235/3826; C04B2235/3891; C04B2235/42; C04B2235/421; C04B2235/50; C04B2235/54; C04B2235/5418; C04B2235/5436; C04B2235/5445; C04B2235/60; C04B2235/616; C04B2235/70; C04B2235/80; C04B2235/96; C04B2235/9669; C04B2235/9684; Y; Y10; Y10S; Y10S428/00; Y10S428/902; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2916; Y10T428/2918; Y10T428/30
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
105 words
An oxygen resistant high temperature structure comprising: a carbonous matrix; an outer refractory coating over said matrix; silicon, in elemental form and/or as a moiety of a compound dispersed throughout said matrix; boron, in elemental form and/or as a moiety of a compound dispersed throughout said matrix; titanium, in elemental form and/or as a moiety of a compound dispersed throughout said matrix; said silicon and said boron oxidizing when exposed to a high temperature oxidizing environment to form silicon oxide and boron oxide; and said titanium forming titanium oxide stabilizing a molten phase of the boron oxide wherein the composition range is about 0.170≦(Ti+Si)/B<210 .
Claim 2
Dependent Claim
105 words
An oxygen resistant high temperature structure comprising: a carbonous matrix; an outer refractory coating over said matrix; silicon, in elemental form and/or as a moiety of a compound dispersed throughout said matrix; boron, in elemental form and/or as a moiety of a compound dispersed throughout said matrix; titanium, in elemental form and/or as a moiety of a compound dispersed throughout said matrix; said silicon and said boron oxidizing when exposed to a high temperature oxidizing environment to form silicon oxide and boron oxide; and said titanium forming titanium oxide stabilizing a molten phase of the boron oxide wherein the composition range is about 0.170≦(Ti+Si)/B<210 .
Claim 3
Dependent Claim
24 words
An oxygen resistant composite according to claim 1 wherein the composition is about 10TiO 2 . 20SiO 2 . 70B 2 O 3 .
Claim 4
Dependent Claim
16 words
An oxygen resistant composite according to claim 1 wherein said matrix includes reinforcing fibers disposed therethrough.
Claim 5
Dependent Claim
30 words
An oxygen resistant composite according to claim 1 wherein said outer refractory coating is selected from the group consisting of silicon, silicon carbide, silicon nitride, aluminum nitride, and silicon boride.
Claim 6
Dependent Claim
24 words
An oxygen resistant composite according to claim 4 wherein the composition is about 10TiO 2 . 20SiO 2 . 70B 2 O 3 .
Claim 7
Dependent Claim
118 words
An oxygen resistant high temperature composite structure comprising: a carbonous matrix including reinforcing high temperature fibers disposed within said matrix; an outer refractory coating covering said matrix; boron, in elemental form and/or as a moiety of a compound dispersed throughout said matrix; silicon, in elemental form and/or as a moiety of a compound dispersed throughout said matrix; and titanium, in elemental form and/or as a moiety of a compound dispersed throughout said matrix, said silicon and said boron oxidizing when exposed to a high temperature, oxidizing environment to form silicon oxide and boron oxide, and said titanium forming titanium oxide which stabilizes the molten phase of boron oxide which forms wherein the composite range is about 0.1700≦(Ri+Si)/B <0.210.
Claim 8
Dependent Claim
118 words
An oxygen resistant high temperature composite structure comprising: a carbonous matrix including reinforcing high temperature fibers disposed within said matrix; an outer refractory coating covering said matrix; boron, in elemental form and/or as a moiety of a compound dispersed throughout said matrix; silicon, in elemental form and/or as a moiety of a compound dispersed throughout said matrix; and titanium, in elemental form and/or as a moiety of a compound dispersed throughout said matrix, said silicon and said boron oxidizing when exposed to a high temperature, oxidizing environment to form silicon oxide and boron oxide, and said titanium forming titanium oxide which stabilizes the molten phase of boron oxide which forms wherein the composite range is about 0.1700≦(Ri+Si)/B <0.210.
Claim 9
Dependent Claim
22 words
An oxygen resistant composite according to claim the composition is about 10TiO 2 . 20SiO 2 . 70B 2 O 3 .
Claim 10
Dependent Claim
30 words
An oxygen resistant composite according to claim 7 wherein said outer refractory coating is selected from the group consisting of silicon, silicon carbide, silicon nitride, aluminum nitride, and silicon boride.
Claim 11
Independent Claim
134 words
A method of forming an oxygen resistant high temperature structure comprising: selecting a carbon-char yielding material, dispersing boron in elemental form and/or as a moiety of a compound throughout said material, dispersing silicon in elemental form and/or as a moiety of a compound throughout said material, dispersing titanium, in elemental form and/or as a moiety of a compound throughout said material; heating said char-yielding material under pressure to carbonize the same, thereby forming a carbonous matrix; applying an outer refractory coating to said carbonous matrix; said boron, silicon and titanium being dispersed within the range of about 0.170≦(Ti+Si)/B<0.210, said boron and said silicon oxidizing when exposed to a high temperature, oxidizing environment forming boron oxide and silicon oxide, and said titanium forming titanium oxide which stabilizes the molten phase of boron oxide which forms.
Claim 12
Independent Claim
134 words
A method of forming an oxygen resistant high temperature structure comprising: selecting a carbon-char yielding material, dispersing boron in elemental form and/or as a moiety of a compound throughout said material, dispersing silicon in elemental form and/or as a moiety of a compound throughout said material, dispersing titanium, in elemental form and/or as a moiety of a compound throughout said material; heating said char-yielding material under pressure to carbonize the same, thereby forming a carbonous matrix; applying an outer refractory coating to said carbonous matrix; said boron, silicon and titanium being dispersed within the range of about 0.170≦(Ti+Si)/B<0.210, said boron and said silicon oxidizing when exposed to a high temperature, oxidizing environment forming boron oxide and silicon oxide, and said titanium forming titanium oxide which stabilizes the molten phase of boron oxide which forms.
Claim 13
Dependent Claim
32 words
An oxygen resistant composite according to claim 9 wherein the composition of boron, silicon, and titanium in a range of about 1O 2 . 20SiO 2 . 70B 2 O 3 .
Claim 14
Independent Claim
160 words
A method of forming an oxygen resistant high temperature structure comprising: selecting a carbon-char yielding material, dispersing reinforcing graphite fibers throughout said material, dispersing boron in elemental form and/or as a moiety of a compound throughout said material, dispersing silicon in elemental form and/or as a moiety of a compound throughout said material, dispersing titanium, in elemental form and/or as a moiety of a compound throughout said material; heating said char-yielding material under pressure to carbonize the same, thereby forming a carbonous matrix; and applying an outer refractory coating to said matrix constructed of material selected from the group consisting of silicon, silicon carbide, silicon nitride, aluminum nitride, and silicon boride, said boron, silicon and titanium being dispersed within the range of about 0.170≦(Ti+Si)/B<0.210, said boron and said silicon oxidizing when exposed to a high temperature, oxidizing environment forming boron oxide and silicon oxide, and said titanium forming titanium oxide that stabilizes the molten phase of boron oxide which forms.
Claim 15
Independent Claim
160 words
A method of forming an oxygen resistant high temperature structure comprising: selecting a carbon-char yielding material, dispersing reinforcing graphite fibers throughout said material, dispersing boron in elemental form and/or as a moiety of a compound throughout said material, dispersing silicon in elemental form and/or as a moiety of a compound throughout said material, dispersing titanium, in elemental form and/or as a moiety of a compound throughout said material; heating said char-yielding material under pressure to carbonize the same, thereby forming a carbonous matrix; and applying an outer refractory coating to said matrix constructed of material selected from the group consisting of silicon, silicon carbide, silicon nitride, aluminum nitride, and silicon boride, said boron, silicon and titanium being dispersed within the range of about 0.170≦(Ti+Si)/B<0.210, said boron and said silicon oxidizing when exposed to a high temperature, oxidizing environment forming boron oxide and silicon oxide, and said titanium forming titanium oxide that stabilizes the molten phase of boron oxide which forms.
Claim 16
Dependent Claim
32 words
An oxygen resistant composite according to claim 11 wherein the composition of boron, silicon, and titanium in a range of abouat 10TiO 2 . 20SiO 2 . 70B 2 O 3 .
References Cited (Backward Citations)
US3364152A
Cited
US3672936A
Cited
US4101354A
Cited
US4339021A
Cited
US4321298A
Cited
US4429003A
Cited
US4668579A
Cited
US4795677A
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) | 1993-01-15 | 1993-07-17 | 1994-01-16 | $2000.00 | Window Closed / Lapsed |
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