Patent US4707332A successfully refreshed from Google Patents.
US4707332A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sintering process for prealloyed powders
Assignee: MTU Aero Engines AG
•
Filing: 1986-02-07
•
Granted: 1987-11-17
•
Expires: 2006-02-07
Abstract
Abstract A process for manufacturing structural parts of complicated shape from intermetallic phases capable of sintering by means of special additives which serve at the same time as sintering assist and increase the ductility of the finished structural part. The process includes the steps of making by melting a pre-alloy of the intermetallic phase, comminuting the pre-alloy into fine powder and mixing the fine powder with one or more additives into a mass which can then be shaped and subsequently sintered at a temperature of 70 to 95% of the absolute melting point of the intermetallic phases into a structural part of increased ductility and a density greater than 95% of the theoretical density which might possibly be subjected to subsequent pressing operations.
Inventors
- 👤 Werner Huether
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:34
CPC Classifications
C; C22; C22C; C22C1/00; C22C1/04; C22C1/047; B; B22; B22F; B22F1/00; B22F1/09
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
94 words
A process for the manufacture of structural parts of complicated shapes from powders of intermetallic phases capable of sintering, comprising the steps of making a pre-alloy of the intermetallic phases by melting, comminuting the pre-alloy into a fine powder, mixing into a mass the pre-alloy powder with at least one additive for increasing ductility, and sintering the thus-formed mass at a temperature of about 70 to about 95% of the absolute melting point of the intermetallic phase into a structural part of increased ductility and a density greater than 95% of the theoretical value.
Claim 2
Dependent Claim
94 words
A process for the manufacture of structural parts of complicated shapes from powders of intermetallic phases capable of sintering, comprising the steps of making a pre-alloy of the intermetallic phases by melting, comminuting the pre-alloy into a fine powder, mixing into a mass the pre-alloy powder with at least one additive for increasing ductility, and sintering the thus-formed mass at a temperature of about 70 to about 95% of the absolute melting point of the intermetallic phase into a structural part of increased ductility and a density greater than 95% of the theoretical value.
Claim 3
Dependent Claim
27 words
A process according to claim 1, further comprising the step of imparting to the mixture of the powdered pre-alloy and additives a predetermined shape prior to sintering.
Claim 4
Dependent Claim
13 words
A process according to claim 2, including substantially pressing the sintered structural part.
Claim 5
Dependent Claim
25 words
A process according to claim 1, wherein the powder mixed with one or several additives is further processed prior to the sintering of the mass.
Claim 6
Dependent Claim
13 words
A process according to claim 4, wherein said additives are in elemental condition.
Claim 7
Dependent Claim
25 words
A process according to claim 4, wherein the mass including the mixture of powdered pre-alloy and additive is cold isostatically pressed prior to the sintering.
Claim 8
Dependent Claim
25 words
A process according to claim 4, wherein the mass including the mixture of powdered pre-alloy and additive is processed by injection molding prior to sintering.
Claim 9
Dependent Claim
26 words
A process according to claim 1, wherein the mass including the mixture of powdered pre-alloy and additives is further processed by injection molding prior to sintering.
Claim 10
Dependent Claim
18 words
A process according to claim 8, further comprising the step of heat treatment subsequent to the injection molding.
Claim 11
Dependent Claim
20 words
A process according to claim 9, further comprising the step of hot isostatically pressing the material subsequent to the sintering.
Claim 12
Dependent Claim
20 words
A process according to claim 4, further comprising the step of hot isostatically pressing the material subsequent to the sintering.
References Cited (Backward Citations)
DE897921C
Cited
FR1290458A
Cited
DE1257436B
Cited
DE2258780A1
Cited
DE2227700A1
Cited
US3953205A
Cited
US4347076A
Cited
GB2131457A
Cited
US4624705A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-11-16 | 1991-05-18 | 1991-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-16 | 1995-05-18 | 1995-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-16 | 1999-05-18 | 1999-11-17 | $7700.00 | Window Closed / Lapsed |