US4612048A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dimensionally stable powder metal compositions
Assignee: HAZEN TECHNOLOGIES LC
•
Filing: 1985-07-15
•
Granted: 1986-09-16
•
Expires: 2005-07-15
Abstract
Abstract Powder metal compositions of nickel, molybdenum, boron, carbon, phosphorus and iron which exhibit low shrinkage on sintering.
Inventors
- 👤 Randall M. German
- 👤 Chaman Lall
- 👤 Deepak S. Madan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:54
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/02; C22C33/0257; C22C33/0264; B; B22; B22F; B22F3/00; B22F3/10; B22F3/1003; B22F3/1007
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
51 words
A powder metal composition consisting essentially of about from 1 to 4 wt % nickel, about from 2 to 4 wt % molybdenum, about from 0.1 to 0.3 wt % boron, about from 0.1% to 0.2 wt % carbon, about from 0.1 to 0.2 wt % phosphorus and the balance iron.
Claim 2
Dependent Claim
51 words
A powder metal composition consisting essentially of about from 1 to 4 wt % nickel, about from 2 to 4 wt % molybdenum, about from 0.1 to 0.3 wt % boron, about from 0.1% to 0.2 wt % carbon, about from 0.1 to 0.2 wt % phosphorus and the balance iron.
Claim 3
Dependent Claim
23 words
A powder metal composition of claim 1 wherein the combined weight of boron, carbon and phosphorus is less than about 0.5 wt %.
Claim 4
Dependent Claim
25 words
A powder metal composition of claim 2 consisting essentially of about 0.1% boron, 0.1% carbon, 0.1% phosphorus, 2% nickel, 3% molybdenum and the balance iron.
Claim 5
Dependent Claim
18 words
A powder metal composition of claim 1 having a particle size of about from 1 to 200 microns.
Claim 6
Dependent Claim
102 words
A process for forming a powder metal composition consisting essentially of about from 1 to 4% nickel, about from 2 to 4% molybdenum, about from 0.1 to 0.3% boron, about from 0.1% to 0.2% carbon, about from 0.1% to 0.2% phosphorous and the balance iron by blending the powder components, pressing the blend into the desired configuration at a pressure of about from 400 to 850 MPa, and sintering the resulting article in a partial vacuum, dry hydrogen or an inert atmosphere at a temperature of about from 1160° to 1200° C. for a period of about from 30 to 90 minutes.
Claim 7
Dependent Claim
102 words
A process for forming a powder metal composition consisting essentially of about from 1 to 4% nickel, about from 2 to 4% molybdenum, about from 0.1 to 0.3% boron, about from 0.1% to 0.2% carbon, about from 0.1% to 0.2% phosphorous and the balance iron by blending the powder components, pressing the blend into the desired configuration at a pressure of about from 400 to 850 MPa, and sintering the resulting article in a partial vacuum, dry hydrogen or an inert atmosphere at a temperature of about from 1160° to 1200° C. for a period of about from 30 to 90 minutes.
Claim 8
Dependent Claim
33 words
A process of claim 5 wherein the resulting article is subsequently heat treated at a temperature of from from 800° to 1000° C. for a period of about from 1 to 2 hours.
Claim 9
Dependent Claim
26 words
A process of claim 5 wherein the article is sintered in dry hydrogen or a partial vacuum of about from 100 to 500 microns of mercury.
References Cited (Backward Citations)
US3977838A
Cited
US4526617A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-09-15 | 1990-03-17 | 1990-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-15 | 1994-03-17 | 1994-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-15 | 1998-03-17 | 1998-09-16 | $7700.00 | Window Closed / Lapsed |