US4842953A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Abradable article, and powder and method for making
Assignee: General Electric Co
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Filing: 1986-11-28
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Granted: 1989-06-27
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Expires: 2006-11-28
Abstract
Abstract A mixture of two powdered alloys of the M, Cr, Al type, M being Co and/or Ni, is disclosed, in one form, for use in providing an abradable surface of an article and is characterized by the substantial absence of B. The first alloy has substantially no Si and has a higher melting range than that of the second alloy. The second alloy has substantially no Y and consists essentially of, by weight, 8-12% Si, 1.5-4% Al, 10-30% Cr, with the balance M and incidiental impurities. The total mixture composition consists essentially of, by weight, 10-35% Cr, 4-10% Al, from a small but effective amount up to about 0.09% Y, 2-6% Si, with the balance M and incidental impurities.
Inventors
- 👤 Roger J. Perkins
- 👤 Murray S. Smith, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:23
CPC Classifications
B; B22; B22F; B22F7/00; B22F7/06; B22F7/062; B22F1/00; B23; B23K; B23K35/00; B23K35/22; B23K35/24; B23K35/30; B23K35/3046; C; C22; C22C; C22C1/00; C22C1/04; C22C1/0433; B22F2007/068; B22F2998/00; B22F2998/10; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12063
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
192 words
A mixture of two powdered alloys each comprising a base of elements M, Cr and Al in which M is at least one element selected from the group consisting of Co and Ni, the mixture having a total mixture composition consisting essentially of, by weight, 10-35% Cr, 4-10% Al, from a small but effective amount up to about 0.09% Y, 2-6% Si, with the balance M and incidental impurities, and further characterized by the substantial absence of B; a first of the powdered alloys having a solidus and a liquidus, consisting of 50-70 wt % of the mixture and having a melting range higher than a second of the powdered alloys; the first alloy characterized by the substantial absence of Si and the presence of Y in an amount, up to 0.15 wt %, which will provide the Y content in the total mixture composition; the second of the powdered alloys having a solidus and a liquidus, consisting essentially of the balance of the mixture, being characterized by the substantial absence of Y, and consisting essentially of, by weight, 8-12% Si, 1.5-4% Al, 10-30% Cr, with the balance M and incidental impurities.
Claim 2
Dependent Claim
192 words
A mixture of two powdered alloys each comprising a base of elements M, Cr and Al in which M is at least one element selected from the group consisting of Co and Ni, the mixture having a total mixture composition consisting essentially of, by weight, 10-35% Cr, 4-10% Al, from a small but effective amount up to about 0.09% Y, 2-6% Si, with the balance M and incidental impurities, and further characterized by the substantial absence of B; a first of the powdered alloys having a solidus and a liquidus, consisting of 50-70 wt % of the mixture and having a melting range higher than a second of the powdered alloys; the first alloy characterized by the substantial absence of Si and the presence of Y in an amount, up to 0.15 wt %, which will provide the Y content in the total mixture composition; the second of the powdered alloys having a solidus and a liquidus, consisting essentially of the balance of the mixture, being characterized by the substantial absence of Y, and consisting essentially of, by weight, 8-12% Si, 1.5-4% Al, 10-30% Cr, with the balance M and incidental impurities.
Claim 3
Dependent Claim
90 words
The mixture of claim 1 in which the total mixture composition consists essentially of, by weight, 20-25% Cr, 6-8% Al, 0.02-0.09% Y, 2-4% Si, with the balance M; the first of the powdered alloys consists essentially of, by weight, 20-25% Cr, 8-10% al, 0.05-0.15% Y, with the balance M and further characterized by the absence of Si; and the second of the powdered alloys consists essentially of, by weight, 15-20% Cr, 2-4% Al, 8-11% Si, with the balance M and incidental impurities and further characterized by the absence of Y.
Claim 4
Dependent Claim
102 words
The mixture of claim 2 in which the total mixture composition consists essentially of, by weight, 20-35% Ni, 20-25% Cr, 6.5-8% Al, 0.04-0.09% Y, 2.5-3.5% Si, with the balance Co and incidental impurities; the first of the powdered alloys consists essentially of, by weight, 15-35% Ni, 20-25% Cr, 8-10% Al, 0.05-0.15% Y, with the balance Co and incidental impurities and further characterized by the absence of Si; and the second of the powdered alloys consists essentially of, by weight, 13-30% Co, 18-20% Cr, 2-4% Al, 8-12% Si with the balance Ni and incidental impurities and further characterized by the absence of Y.
Claim 5
Dependent Claim
99 words
The mixture of claim 3 in which the total mixture composition consists essentially of, by weight, 25-35% Ni, 20-25% Cr, 7-8% Al, 0.05-0.09% Y, 3-3.5% Si, with the balance Co and incidental impurities; the first of the powdered alloys consists essentially of, by weight, 15-35% Ni, 20-25% Cr, 8-10% Al, 0.05-0.15% Y, with the balance Co and incidental impurities and further characterized by the absence of Si; and the second of the powdered alloys consists essentially of, by weight, 25-30% Co, 18-20% Cr, 3-4% Al, 9.5-10.5% Si with the balance Ni and incidental impurities in the absence of Y.
Claim 6
Dependent Claim
43 words
An improved powdered brazing alloy characterized by the substantial absence of Y and consisting essentially of, by weight, 8-12% Si, 1.5-4% Al, 10-30% Cr with the balance at least one element selected from the group consisting of Co and Ni, and incidental impurities.
Claim 7
Dependent Claim
43 words
An improved powdered brazing alloy characterized by the substantial absence of Y and consisting essentially of, by weight, 8-12% Si, 1.5-4% Al, 10-30% Cr with the balance at least one element selected from the group consisting of Co and Ni, and incidental impurities.
Claim 8
Dependent Claim
17 words
The alloy of claim 5 in which Cr is 15-20%, Al is 2-4% and Si is 8-11%.
Claim 9
Dependent Claim
25 words
The alloy of claim 6 consisting essentially of, by weight, 18-20% Cr, 2-4% Al, 8-11% Si, 13-30% Co, with a balance Ni and incidental impurities.
Claim 10
Dependent Claim
27 words
The alloy of claim 7 in which the Cr is 18-20%, Al is 3-4%, Si is 9.5-10.5%, Co is 25-30% with a balance Ni and incidental impurities.
Claim 11
Dependent Claim
68 words
An article including an environmentally resistant, abradable surface portion comprising: an inner portion of a superalloy selected from a group consisting of Co-base and Ni-base superalloys and having an incipient melting temperature; and an outer portion metallurgically bonded with the inner portion, and consolidated and liquid phase sintered from the mixture of claim 1; the outer portion having a thickness in the range of at least about 0.05".
Claim 12
Dependent Claim
42 words
The article of claim 9 in the form of a turbine shroud in which: the outer portion is consolidated and liquid phase sintered from the mixture of claim 2; and the outer portion has a thickness in the range of about 0.08-0.15".
Claim 13
Dependent Claim
19 words
The article of claim 10 in which the outer portion has an apparent density of at least about 99%.
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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) | 1992-06-26 | 1992-12-26 | 1993-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-26 | 1996-12-26 | 1997-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-26 | 2000-12-26 | 2001-06-27 | $7700.00 | Window Closed / Lapsed |