US4981643A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hiping method for composite structures
Assignee: General Electric Co
•
Filing: 1990-06-29
•
Granted: 1991-01-01
•
Expires: 2010-06-29
Abstract
Abstract A method for improved HIPing of filament reinforced metal matrix composite samples is disclosed. The method departs from conventional HIPing practice in that it does not rely on the heating of the HIPing gas in order to increase pressure. Rather, the temperature of the article and of the HIPing gas is first to the HIPing temperature and the pressure of the gas and the pressure on the sample is then raised to the HIPing pressure. Benefits are derived in that a lower level of filament fracture results.
Inventors
- 👤 Paul A. Siemers
- 👤 Stephen F. Rutkowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:58
CPC Classifications
C; C22; C22C; C22C47/00; C22C47/14; B; B22; B22F; B22F3/00; B22F3/12; B22F3/14; B22F3/15; C22C47/02; C22C47/06; C22C47/062; C22C47/064; C22C47/068
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
61 words
A method of HIPing which comprises providing a metal matrix composite sample to be HIPed, introducing the sample into a HIPing chamber, raising the temperature of the article and HIPing gas to the HIPing temperature, increasing the pressure of the HIPing medium to the HIPing pressure, and maintaining the combination of temperature and pressure for a time prescribed for said composite.
Claim 2
Independent Claim
61 words
A method of HIPing which comprises providing a metal matrix composite sample to be HIPed, introducing the sample into a HIPing chamber, raising the temperature of the article and HIPing gas to the HIPing temperature, increasing the pressure of the HIPing medium to the HIPing pressure, and maintaining the combination of temperature and pressure for a time prescribed for said composite.
Claim 3
Dependent Claim
16 words
The method of claim 1 in which the temperature is raised to at least 800° C.
Claim 4
Dependent Claim
14 words
The method of claim 1 in which the pressure is at least 5 ksi.
Claim 5
Dependent Claim
19 words
The method of claim 1 in which the sample is a filament reinforced matrix of a titanium base metal.
Claim 6
Dependent Claim
13 words
The method of claim 4 in which the filament is silicon carbide filament.
Claim 7
Dependent Claim
13 words
The method of claim 4 in which the titanium base alloy is Ti-6242.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-12-31 | 1994-07-02 | 1995-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-31 | 1998-07-02 | 1999-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-31 | 2002-07-02 | 2003-01-01 | $7700.00 | Window Closed / Lapsed |