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US4485182A
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US
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Powder composition for producing sintered ceramic
Assignee: Ibiden Co Ltd
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Filing: 1983-07-25
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Granted: 1984-11-27
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Expires: 2003-07-25
Abstract
Abstract A powder composition for producing sintered ceramic, which composition contains fluororesin powder which has not been used in the prior art as one of the materials constituting a molding assistant to be blended in the composition. With this composition, it is possible to produce a high-density green molding with few molding defects under a relatively low molding pressure. The invention also provides a process for producing such a composition.
Inventors
- 👤 Ryo Enomoto
- 👤 Kiyotaka Tsukada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:17
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/626; C04B35/63; C04B35/632; C04B35/634; C04B35/63404; C04B35/63436; C04B35/01; C04B35/10; C04B35/111; C04B35/515; C04B35/56; C04B35/565; C04B35/58; C04B35/584
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
62 words
A powder composition for producing sintered ceramic comprising 100 parts by weight of a ceramic powder composed of one or more components and 0.5 to 15 parts by weight of a fluororesin, and being a granular preparation having a powder bulk density corresponding to 5-46% of the theoretical value and an average particle size within the range from 0.02 to 0.8 mm.
Claim 2
Dependent Claim
62 words
A powder composition for producing sintered ceramic comprising 100 parts by weight of a ceramic powder composed of one or more components and 0.5 to 15 parts by weight of a fluororesin, and being a granular preparation having a powder bulk density corresponding to 5-46% of the theoretical value and an average particle size within the range from 0.02 to 0.8 mm.
Claim 3
Dependent Claim
26 words
A powder composition according to claim 1 wherein said fluororesin is at least one substance selected from polytetrafluoroethylene, polytrifluorochloroethylene, tetrafluoroethylene/hexafluoropropylene copolymer, polyvinylidene fluoride, and ethylene/fluoroethylene copolymer.
Claim 4
Dependent Claim
27 words
A powder composition according to claim 1 or 2 wherein said fluororesin is a finely divided powder having an average particle size of 3 μm or less.
Claim 5
Dependent Claim
26 words
A powder composition according to claim 1 wherein said ceramic powder is a finely divided powder having an average particle size of 2 μm or less.
Claim 6
Dependent Claim
37 words
A powder composition according to claim 1 wherein said ceramic powder is composed principally of a silicon carbide powder having a specific surface area of 5 to 100 m 2 /g and optionally containing a sintering assistant.
Claim 7
Dependent Claim
52 words
A powder composition according to claim 1, comprising at least one compound selected from the group consisting of silicon carbide, boron carbide, aluminum carbide, tungsten carbide, titanium carbide, tantalum carbide, silicon nitride, boron nitride, aluminum nitride, titanium nitride, zirconium nitride, steatite, forsterite, alumina, zircon beryllia, magnesia, mullite, cordierite, aluminum titanate and zirconia.
References Cited (Backward Citations)
US2593507A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-11-27 | 1988-05-28 | 1988-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-27 | 1992-05-28 | 1992-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-27 | 1996-05-28 | 1996-11-27 | $7700.00 | Window Closed / Lapsed |