US4701301A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing an internal-oxidized alloy or a shaped article thereof
Assignee: Applied Science Research Institute
•
Filing: 1986-07-16
•
Granted: 1987-10-20
•
Expires: 2006-07-16
Abstract
Abstract A process for producing an internal-oxidized alloy, which comprises allowing a plasma generated in the presence of oxygen, a gas of an oxygen atom-containing compound or a mixture of oxygen and a gas of an oxygen atom-containing compound to act on an alloy consisting of at least two metal elements, thereby selectively oxidizing at least one metal element other than the matrix metal in said alloy. Particles of the internal-oxidized alloy thus obtained can, if necessary, be molded into a desired shape and sintered. Said process enables one to produce an internal-oxidized alloy at a high speed at a temperature of not more than 0.9 Tm (Tm: the melting point of the starting alloy) and does not require the step of separating an internal-oxidizing agent which step is required in the conventional process.
Inventors
- 👤 Hideyuki Kuwahara
- 👤 Bunji Kondo
- 👤 Jun Takada
- 👤 Kenji Yanagihara
- 👤 Mituo Kimura
- 👤 Masahiro Niinomi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:41
CPC Classifications
C; C22; C22C; C22C1/00; C22C1/10; C22C1/1078
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
66 words
A process for producing an internal-oxidized alloy, which comprises allowing a plasma generated in the presence of oxygen, a gas of an oxygen atom-containing compound or a mixture of oxygen and a gas of an oxygen atom-containing compound to act on an alloy consisting of at least two metal elements, thereby selectively oxidizing at least one metal element other than the matrix metal in said alloy.
Claim 2
Dependent Claim
66 words
A process for producing an internal-oxidized alloy, which comprises allowing a plasma generated in the presence of oxygen, a gas of an oxygen atom-containing compound or a mixture of oxygen and a gas of an oxygen atom-containing compound to act on an alloy consisting of at least two metal elements, thereby selectively oxidizing at least one metal element other than the matrix metal in said alloy.
Claim 3
Dependent Claim
28 words
A process for producing an internal-oxidized alloy according to claim 1, wherein the starting alloy is heated by induction heating when the plasma is allowed to act thereon.
Claim 4
Dependent Claim
28 words
A process for producing an internal-oxidized alloy according to claim 1, wherein the alloy is Ag-Al, Ag-Bi, Ag-Cd, Cu-Al, Cu-Si, Cu-Ti, Fe-Si, Fe-Mo, Fe-Ti, Ni-Th, Ni-Os or Ni-Ti.
Claim 5
Dependent Claim
45 words
A process for producing an internal-oxidized alloy according to claim 1, wherein the starting alloy contains at least one metal element other than the matrix metal in a total amount of 20 ppm to 20% by weight based on the weight of the starting alloy.
Claim 6
Dependent Claim
101 words
A process for producing an internal-oxidized alloy according to claim 1, wherein the plasma is generated in the presence of O 2 , CO 2 , NO 2 , N 2 O 3 , N 2 O 4 , N 2 O 5 SO 2 , SO 3 , TeO 2 , TeO 3 , SeO 3 , P 4 O 10 , P 4 O 6 , As 2 O 5 , As 4 O 6 , Sb 2 O 5 , Sb 4 O 6 , Bi 2 O 5 , Bi 4 O 6 or H 2 O.
Claim 7
Dependent Claim
30 words
A process for producing an internal-oxidized alloy according to claim 1, wherein the plasma is generated in a space having a degree of vacuum of 1×10 -5 to 100 Torr.
Claim 8
Dependent Claim
28 words
A process for producing an internal-oxidized alloy according to claim 1, wherein the positive ion density of the plasma is 10 5 -10 12 positive ions/cm 3 .
Claim 9
Dependent Claim
36 words
A process for producing an internal-oxidized alloy according to claim 1, wherein the plasma is allowed to act on the starting alloy at a temperature not higher than the melting point (Tm) of the starting alloy.
Claim 10
Dependent Claim
84 words
A process for producing a shaped article of an internal-oxidized alloy, which comprises allowing a plasma generated in the presence of oxygen, a gas of an oxygen atom-containing compound or a mixture of oxygen and an oxygen atom-containing compound to act on an alloy in the form of particles consisting of at least two metal elements, thereby selectively oxidizing at least one metal element other than the matrix metal, and then molding and sintering the internal-oxidized alloy in the form of particles thus obtained.
Claim 11
Dependent Claim
84 words
A process for producing a shaped article of an internal-oxidized alloy, which comprises allowing a plasma generated in the presence of oxygen, a gas of an oxygen atom-containing compound or a mixture of oxygen and an oxygen atom-containing compound to act on an alloy in the form of particles consisting of at least two metal elements, thereby selectively oxidizing at least one metal element other than the matrix metal, and then molding and sintering the internal-oxidized alloy in the form of particles thus obtained.
Claim 12
Dependent Claim
27 words
A process for producing an internal-oxidized alloy according to claim 9, wherein the particles of the alloy have an average diameter of 50 Å to 100 μm.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-10-19 | 1991-04-20 | 1991-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-19 | 1995-04-20 | 1995-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-19 | 1999-04-20 | 1999-10-20 | $7700.00 | Window Closed / Lapsed |