US3844727A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cast composite structure with metallic rods
Assignee: RTX Corp
•
Filing: 1970-06-12
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Granted: 1974-10-29
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Expires: 1990-06-12
Abstract
Abstract Macrocomposite structures composed of a low tensile strength refractory mass surrounding a plurality of single crystal wires, the refractory mass being prestressed in compression by the single crystal wires or rods, and the structure made by such process.
Inventors
- 👤 S Copley
- 👤 B Kear
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:29
CPC Classifications
B; B22; B22D; B22D19/00; B22D19/02; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49316; Y10T29/49336; Y10T29/49337; Y10T428/00; Y10T428/12; Y10T428/12361; Y10T428/12375; Y10T428/12486
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
76 words
A CAST COMPOSITE STRUCTURE COMPRISING A CENTRAL BODY OF REFRACTORY CERAMIC MATERIAL HAVING A PLURALITY OF LONGITUDINALLY EXTENDING PASSAGES THERETHROUGH, METALLIC END ELEMENTS AT OPPOSITE ENDS OF THE CENTRAL BODY, AND METALLIC RODS EXTENDING THROUGH THE PASSAGES IN SAID CENTRAL BODY AND INTEGRAL WITH SAID END ELEMENTS, SAID METALLIC RODS HAVING A HIGHER RATE OF THERMAL CONTRACTION THAN THE REFRACTORY CERAMIC MATERIAL, AND SAID RODS PLACING THE CENTRAL BODY IN COMPRESSION AS THE CAST STRUCTURE COOLS.
Claim 2
Dependent Claim
76 words
A CAST COMPOSITE STRUCTURE COMPRISING A CENTRAL BODY OF REFRACTORY CERAMIC MATERIAL HAVING A PLURALITY OF LONGITUDINALLY EXTENDING PASSAGES THERETHROUGH, METALLIC END ELEMENTS AT OPPOSITE ENDS OF THE CENTRAL BODY, AND METALLIC RODS EXTENDING THROUGH THE PASSAGES IN SAID CENTRAL BODY AND INTEGRAL WITH SAID END ELEMENTS, SAID METALLIC RODS HAVING A HIGHER RATE OF THERMAL CONTRACTION THAN THE REFRACTORY CERAMIC MATERIAL, AND SAID RODS PLACING THE CENTRAL BODY IN COMPRESSION AS THE CAST STRUCTURE COOLS.
Claim 3
Dependent Claim
17 words
A cast composite structure as in claim 1 in which the rods are cast single crystal rods.
Claim 4
Dependent Claim
26 words
A cast composite structure as in claim 2 in which the end elements are a cast columnar grain structure and are cast integral with said rods.
Claim 5
Dependent Claim
19 words
A cast composite structure as in claim 3 in which the rods are homogeneously arranged in the refractory material.
Claim 6
Dependent Claim
19 words
A cast composite structure as in claim 3 in which the rods are inhomogeneously arranged in the refractory material.
Claim 7
Dependent Claim
98 words
A cast turbine vane including a central portion that is airfoil shape in cross-section and of a refractory ceramic material, said portion having a plurality of parallel passages extending therethrough from end to end, metallic end shrouds at opposite ends of and in contact with the ends of the central portion, and metallic cast rods extending through said passages and integral with said end shrouds, said rods having a higher rate of thermal contraction than the refractory material and thereby placing the latter in compression as the cast structure cools below the solidification temperature of the metallic rods.
Claim 8
Dependent Claim
98 words
A cast turbine vane including a central portion that is airfoil shape in cross-section and of a refractory ceramic material, said portion having a plurality of parallel passages extending therethrough from end to end, metallic end shrouds at opposite ends of and in contact with the ends of the central portion, and metallic cast rods extending through said passages and integral with said end shrouds, said rods having a higher rate of thermal contraction than the refractory material and thereby placing the latter in compression as the cast structure cools below the solidification temperature of the metallic rods.
Claim 9
Dependent Claim
18 words
A cast turbine vane as in claim 6 in which each of the rods is a single crystal.
Claim 10
Dependent Claim
22 words
A cast turbine vane as in claim 7 in which the shrouds are columnar grain structure and are integral with the rods.
References Cited (Backward Citations)
US2665881A
Cited
GB733061A
Cited
US3098723A
Cited
US3084421A
Cited
US3233985A
Cited
US3219496A
Cited
US3215511A
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US3427185A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |