Patent US4475980A successfully refreshed from Google Patents.
US4475980A
Expired / Lapsed
US
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Solid state production of multiple single crystal articles
Assignee: RTX Corp
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Filing: 1982-06-01
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Granted: 1984-10-09
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Expires: 2002-06-01
Abstract
Abstract A process is described for the production of multiple single crystal articles having identical crystallographic orientations. A starting article is provided which consists of a single crystal portion and a fine grain portion. This starting article is bonded to another fine grain portion and the single crystal is caused to grow into the second article. The growth of the crystal is then stopped and the bonded article is severed to provide a single crystal article and another portion which can be used to repeat the process.
Inventors
- 👤 Chris C. Rhemer
- 👤 Scott E. Hughes
- 👤 William J. Gostic
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:06
CPC Classifications
C; C30; C30B; C30B3/00; C30B1/00; C30B1/02; B; B23; B23K; B23K20/00; B23K20/02; C30B29/00; C30B29/10; C30B29/52; Y; Y10; Y10S; Y10S117/00; Y10S117/915
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
176 words
A method for producing single crystal material of controlled crystallographic orientation including the steps of: a. providing a first article which is comprised of a single crystal portion and a polycrystalline portion receptive to grain growth, said two portions being separated by a boundary which is capable of movement into the polycrystalline portion under proper conditions; b. providing a second article comprised of polycrystalline material which is receptive to grain growth; c. bonding the first and second articles together to form a third article so that the polycrystalline portion of the first article is bonded to the second article; said bonding being performed by a process which does not adversely affect the receptivity of the polycrystalline material to grain growth, which produces a joint which does not impede the passage of the single crystal boundary and which does not cause nucleation of new grains at the bond interface; d. treating the bonded article in a thermal gradient so as to cause the single crystal portion to grow through the bond and into the second article material.
Claim 2
Independent Claim
176 words
A method for producing single crystal material of controlled crystallographic orientation including the steps of: a. providing a first article which is comprised of a single crystal portion and a polycrystalline portion receptive to grain growth, said two portions being separated by a boundary which is capable of movement into the polycrystalline portion under proper conditions; b. providing a second article comprised of polycrystalline material which is receptive to grain growth; c. bonding the first and second articles together to form a third article so that the polycrystalline portion of the first article is bonded to the second article; said bonding being performed by a process which does not adversely affect the receptivity of the polycrystalline material to grain growth, which produces a joint which does not impede the passage of the single crystal boundary and which does not cause nucleation of new grains at the bond interface; d. treating the bonded article in a thermal gradient so as to cause the single crystal portion to grow through the bond and into the second article material.
Claim 3
Dependent Claim
48 words
A method as in claim 1 which includes the step of stopping the single crystal growth in step d at a point where polycrystalline material remains and severing the single crystal-boundary polycrystalline portion of the third article so as to provide a starting article to repeat the process.
Claim 4
Dependent Claim
42 words
A method as in claim 1 in which the polycrystallline material in both the first and second articles has a predetermined texture which makes it particularly adapted to the growth of single crystals of substantially the orientation of the single crystal portion.
Claim 5
Dependent Claim
43 words
A method as in claim 1 in which the first and second articles are nickel base superalloys bonded together by diffusion bonding performed at a temperature which is 150° F.-400° F. (66° C.-204° C.) below the gamma prime solvus temperature of the alloys.
Claim 6
Dependent Claim
25 words
A method as in claim 1 in which the first and second articles are in sheet form and are bonded together with a lap joint.
Claim 7
Dependent Claim
33 words
A method as in claim 5 in which the leading edge, that edge which is nearest the single crystal portion of the first article has been beveled so as to blend the joint.
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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) | 1987-10-09 | 1988-04-09 | 1988-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-09 | 1992-04-09 | 1992-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-09 | 1996-04-09 | 1996-10-09 | $7700.00 | Window Closed / Lapsed |