US5190709A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reaction injection molding of ceramics using a ceramic precursor as a binder
Assignee: Kion Corp
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Filing: 1992-06-26
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Granted: 1993-03-02
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Expires: 2012-06-26
Abstract
Abstract A process for reaction injection molding of ceramic articles is disclosed. The process comprises (a) injecting a fluid, non-dilatant mixture comprising a ceramic powder, a metal powder or mixtures thereof, and a curable ceramic precursor that is a liquid below its curing temperature, into a heated mold, (b) curing the ceramic precursor to produce a hardened molded article, (c) heating the hardened molded article under a suitable atmosphere to a temperature sufficient to convert the ceramic precursor to a ceramic, and (d) sintering the ceramic to the desired density.
Inventors
- 👤 Alexander Lukacs, III
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:08
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/56; C04B35/565; C04B35/571; C04B35/58; C04B35/584; C04B35/589; C04B35/591; C04B35/622; C04B35/626; C04B35/63; C04B35/632; C04B35/634; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/48; C04B2235/483
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
90 words
A process for preparing a sintered ceramic article comprising: (a) injecting into a heated mold a fluid, solvent-free, non-dilatant mixture comprising at least 40% by volume of a ceramic powder, a metal powder or mixtures thereof, and a curable poly(thio)ureasilazane binder that is a liquid below its curing temperature, to cure the binder and produce a hardened molded article, (b) heating the hardened molded article under a suitable atmosphere to a temperature sufficient to convert the cured binder to a ceramic and (c) sintering the article to the desired density.
Claim 2
Dependent Claim
90 words
A process for preparing a sintered ceramic article comprising: (a) injecting into a heated mold a fluid, solvent-free, non-dilatant mixture comprising at least 40% by volume of a ceramic powder, a metal powder or mixtures thereof, and a curable poly(thio)ureasilazane binder that is a liquid below its curing temperature, to cure the binder and produce a hardened molded article, (b) heating the hardened molded article under a suitable atmosphere to a temperature sufficient to convert the cured binder to a ceramic and (c) sintering the article to the desired density.
Claim 3
Dependent Claim
23 words
The process of claim 1 wherein the mixture in (a) also comprises a free radical source and the poly(thio)ureasilazane is cured by heating.
Claim 4
Dependent Claim
14 words
The process of claim 2 wherein the free radical source is an organic peroxide.
Claim 5
Dependent Claim
15 words
The process of claim 1 wherein the mixture in (a) also comprises a sintering aid.
Claim 6
Dependent Claim
11 words
The process of claim 1 wherein the powder is silicon metal.
Claim 7
Dependent Claim
12 words
The process of claim 1 wherein the ceramic powder is silicon carbide.
Claim 8
Dependent Claim
17 words
The process of claim 1 wherein the poly(thio)ureasilazane has a viscosity of less than about 2000 cp.
Claim 9
Dependent Claim
17 words
The process of claim 7 wherein the poly(thio)ureasilazane has a viscosity of less than about 100 cp.
Claim 10
Dependent Claim
15 words
The process of claim 1 wherein the injection temperature is less than about 120° C.
Claim 11
Dependent Claim
15 words
The process of claim 9 wherein the injection temperature is less than about 60° C.
Claim 12
Dependent Claim
16 words
The process of claim 1 wherein the injection pressure is between 50 psi and 2000 psi.
Claim 13
Dependent Claim
16 words
The process of claim 11 wherein the injection pressure is between 100 psi and 2000 psi.
Claim 14
Dependent Claim
14 words
The process of claim 1 wherein the sintered ceramic is a silicon nitride-containing ceramic.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-03-01 | 1996-08-31 | 1997-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-03-01 | 2000-08-31 | 2001-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-03-01 | 2004-08-31 | 2005-03-02 | $7700.00 | Window Closed / Lapsed |