US4964907A
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US
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Sintered bodies and production process thereof
Assignee: JFE Steel Corp
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Filing: 1989-08-14
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Granted: 1990-10-23
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Expires: 2009-08-14
Abstract
Abstract A process is provided for the production of a sintered body. The process includes the following consecutive steps: (i) mixing and kneading one or more metal powders and/or one or more alloy powder with a binder into a compound, said metal and alloy powders having an average particle size not greater than 30 μm, (ii) injection-molding the compound into a green body; (iii) debinding the green body to form a debound body; and (iv) subjecting the debound body to first-stage sintering at 1,050°-1,250° C. in a reducing or reduced-pressure atmosphere and then to second-stage sintering at a temperature in a range of 1,100°-1,400° C. which is higher than that of the first-stage sintering. This process can provide sintered Ti bodies and sintered magnetic bodies of the Fe-Si type, which have a density ratio of at least 95%.
Inventors
- 👤 Yoshisato Kiyota
- 👤 Junichi Ohta
- 👤 Hiroshi Ohtsubo
- 👤 Shigeaki Takajo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:38
CPC Classifications
B; B22; B22F; B22F3/00; B22F3/10; B22F3/22; B22F3/225; B22F3/1003; B22F3/1007; B22F3/101; B22F3/1017; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/20; H01F1/22; A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/3094; A61F2002/30968; B22F2201/00; B22F2201/10; B22F2201/20; B22F2998/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
124 words
A process for the production of a sintered body, which comprises the following steps: (i) mixing and kneading at least one powder selected from the group which consists of one or more metal powders and one or more alloy powders with a binder into a compound, said metal and alloy powders having an average particle size not greater than 30 μm; (ii) injection-molding the compound into a green body; (iii) debinding the green body to form a debound body; and (iv) subjecting the debound body to first-stage sintering at 1,050°-1,250° C. in a reducing or reduced-pressure atmosphere and then subjecting the body to second-stage sintering at a temperature in the range of 1,100°-1,400° C., which temperature is higher than that of the first-stage sintering.
Claim 2
Dependent Claim
124 words
A process for the production of a sintered body, which comprises the following steps: (i) mixing and kneading at least one powder selected from the group which consists of one or more metal powders and one or more alloy powders with a binder into a compound, said metal and alloy powders having an average particle size not greater than 30 μm; (ii) injection-molding the compound into a green body; (iii) debinding the green body to form a debound body; and (iv) subjecting the debound body to first-stage sintering at 1,050°-1,250° C. in a reducing or reduced-pressure atmosphere and then subjecting the body to second-stage sintering at a temperature in the range of 1,100°-1,400° C., which temperature is higher than that of the first-stage sintering.
Claim 3
Dependent Claim
37 words
The process as claimed in claim 1, further comprising the step of adjusting the C/O molar ratio of the debound body before conducting the first-stage sintering, and wherein the first-stage sintering is conducted in a reduced-pressure atmosphere.
Claim 4
Dependent Claim
73 words
The process as claimed in claim 1, wherein the powder which is mixed and kneaded as the metal powder with the binder is a Ti powder, said Ti powder having an average particle size not greater than 30 μm, and wherein the first-stage sintering step is conducted at 1,050°-1,200° C. in an atmosphere having a pressure not higher than 1×10 -3 Torr, and wherein the second-stage sintering step is conducted at 1,200°-1,400° C.
Claim 5
Dependent Claim
29 words
The process as claimed in claim 3, further comprising the step of adjusting the C/O molar ratio of the debound body to 0.5-3.0 before conducting the first-stage sintering step.
Claim 6
Dependent Claim
45 words
A sintered Ti body consisting essentially of Ti, C and O the amount being up to 0.1 wt. % of C, up to 0.5 wt. % of O, and the balance of Ti and imperative impurities and having a density ratio of at least 95%.
Claim 7
Dependent Claim
45 words
A sintered Ti body consisting essentially of Ti, C and O the amount being up to 0.1 wt. % of C, up to 0.5 wt. % of O, and the balance of Ti and imperative impurities and having a density ratio of at least 95%.
References Cited (Backward Citations)
US4478790A
Cited
US4721599A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-10-22 | 1994-04-23 | 1994-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-22 | 1998-04-23 | 1998-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-22 | 2002-04-23 | 2002-10-23 | $7700.00 | Window Closed / Lapsed |