US3761201A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hollow turbine blade having diffusion bonded therein
Assignee: Avco Corp
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Filing: 1971-08-27
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Granted: 1973-09-25
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Expires: 1991-08-27
Abstract
Abstract This invention relates to turbine blades having diffusion bonded pins or inserts in the holes which are formed in the turbine blades during casting.
Inventors
- 👤 S Silverstein
- 👤 V Strautman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:52
CPC Classifications
B; B23; B23P; B23P15/00; B23P15/04; F; F01; F01D; F01D5/00; F01D5/12; F01D5/14; F01D5/147; Y; Y10; Y10S; Y10S415/00; Y10S415/915
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
111 words
A turbine blade which comprises: an external body composed of a first material having a predetermined coefficient of expansion, said body defining a hollow interior and being formed with undesirable casting apertures therein; and a blade insert composed of a second material having a greater coefficient of expansion than said external body diffusion bonded in said casting apertures, said insert and aperture having a substantially zero interface fit so that there is direct metal-to-metal contact therebetween such that when said body and insert have been subjected to a heat treatment said insert is diffusion bonded to said body due to the differences in coefficients of expansion of the insert and body.
Claim 2
Dependent Claim
111 words
A turbine blade which comprises: an external body composed of a first material having a predetermined coefficient of expansion, said body defining a hollow interior and being formed with undesirable casting apertures therein; and a blade insert composed of a second material having a greater coefficient of expansion than said external body diffusion bonded in said casting apertures, said insert and aperture having a substantially zero interface fit so that there is direct metal-to-metal contact therebetween such that when said body and insert have been subjected to a heat treatment said insert is diffusion bonded to said body due to the differences in coefficients of expansion of the insert and body.
Claim 3
Dependent Claim
29 words
A turbine blade as set forth in claim 1 further comprising a coating on said external body and said insert, said coating being secured thereon during the heat treatment.
References Cited (Backward Citations)
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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) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |