US5015289A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing a metal body by means of injection molding
Assignee: King Invest Co Ltd
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Filing: 1990-08-10
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Granted: 1991-05-14
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Expires: 2010-08-10
Abstract
Abstract A manufacturing method for a metal body by means of injection molding that comprises the steps of mixing and kneading a metal powder with short fibers such as metallic fibers, carbon fibers and an organic binder, injection-molding the kneaded mixture to form a green body, removing the organic binder from the green body, and sintering the brown body. The short fibers are added in an amount ranging from about 0.1 to 20 wt. % against 100 wt. % of the metal powder and have a melting point of at least 350 DEG C., and at the time of sintering the fibers not less than 30 vol. % become fused and then integrated with the metal. The short fibers act as a reinforcement, strengthening the brown body as well as preventing deformation and cracking of the green body during debinding.
Inventors
- 👤 Takuo Toda
- 👤 Masao Tsuda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:14
CPC Classifications
B; B22; B22F; B22F3/00; B22F3/22; B22F3/225; B22F1/00; B22F1/10; B22F1/103; C; C22; C22C; C22C47/00; C22C47/14; B22F2998/00
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
127 words
In a method of preparing a metal body by means of injection molding wherein, a metal powder with short fibers and an organic binder, are mixed and kneaded, the kneaded mixture is injection molded to form a green body, the organic binder is removed from said green body to form a brown body, and the brown body is sintered, the improvement which comprises the short fibers have a melting point of about at least 350° C., are being added in an amount ranging from about 0.1 to 20 wt. % based on 100 wt. % of the metal powder, and such that at the time of sintering the shortened fibers, not less than 30 vol. % become fused with the metal powder and integrate with the metal.
Claim 2
Dependent Claim
127 words
In a method of preparing a metal body by means of injection molding wherein, a metal powder with short fibers and an organic binder, are mixed and kneaded, the kneaded mixture is injection molded to form a green body, the organic binder is removed from said green body to form a brown body, and the brown body is sintered, the improvement which comprises the short fibers have a melting point of about at least 350° C., are being added in an amount ranging from about 0.1 to 20 wt. % based on 100 wt. % of the metal powder, and such that at the time of sintering the shortened fibers, not less than 30 vol. % become fused with the metal powder and integrate with the metal.
Claim 3
Dependent Claim
17 words
The method of claim 1 wherein said short fibers are a mixture of metallic and carbon fibers.
Claim 4
Dependent Claim
20 words
The method of claim 1 wherein said metal powder has a mean particle size of about 20 μm or less.
Claim 5
Dependent Claim
20 words
The method of claim 1 wherein said metal powder has a mean particle size of about 10 μm or less.
Claim 6
Dependent Claim
28 words
The method of claim 1 wherein said short fibers have a diameter of about 20 μm or less and a length from about 2 mm to 10 mm.
Claim 7
Dependent Claim
22 words
The method of claim 1 wherein said organic binder is selected from the group consisting of polyethylene, polystyrene, polyamide, and paraffinic wax.
Claim 8
Dependent Claim
30 words
The method of claim 1 wherein said organic binder is present in an amount from about 6 to 15 wt. % based on 100 wt. % of the metal powder.
Claim 9
Dependent Claim
20 words
The method of claim 1 wherein said injection-molding is carried out at a pressure from about 400 to 2000 kg/cm2.
Claim 10
Dependent Claim
21 words
The method of claim 1 wherein said injection-molding is carried out at a temperature of from about 120° to 160° C.
Claim 11
Dependent Claim
23 words
The method of claim 1 wherein the organic binder is removed by heating the green body to the melting of the binder point.
Claim 12
Dependent Claim
27 words
The method of claim 1 wherein the organic binder is removed by heating the green body at a rate of from about 10° C. to 200° C./hr.
Claim 13
Dependent Claim
21 words
The method of claim 1 wherein the sintering is carried out at a temperature of from about 1100° to 1500° C.
Claim 14
Dependent Claim
20 words
The method of claim 1 wherein the sintering is carried out at a time from about 0.5 to 4 hours.
Claim 15
Dependent Claim
10 words
A sintered body formed by the process of claim 1.
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) | 1994-05-13 | 1994-11-12 | 1995-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-13 | 1998-11-12 | 1999-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-13 | 2002-11-12 | 2003-05-14 | $7700.00 | Window Closed / Lapsed |