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US4233256A
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Process for injection molding sinterable carbide ceramic materials
Assignee: Stemcor Corp
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Filing: 1978-12-18
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Granted: 1980-11-11
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Expires: 1998-12-18
Abstract
Abstract Ceramic compositions that may be injection molded and subsequently sintered are described. A particulate ceramic material, such as silicon carbide, is coated with a mixture of thermoplastic resin and oils or waxes, and utilized as a feed material in an injection molding process. The molded product may subsequently be sintered at 2000° C. to 2200° C. to produce a hard, dense article.
Inventors
- 👤 Roger W. Ohnsorg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:28
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/626; C04B35/63; C04B35/632; C04B35/634; C04B35/63404; C04B35/63408; C04B35/01; C04B35/013; C04B35/515; C04B35/56; C04B35/565; C04B35/63448; C04B35/63452; C04B35/63472; C04B35/63476; C04B35/63488; C04B35/636; C04B35/6365; C04B35/66
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
183 words
A process for producing a sintered carbide ceramic article comprising the steps of: a. forming a homogeneous mixture containing from about 65 to about 86 percent by weight of a sinterable carbide ceramic material; from about 0.2 to about 0.5 percent by weight of a sintering aid of boron or beryllium selected from the group of elemental beryllium, beryllium compounds, elemental boron, boron compounds, or mixtures thereof; from about 14 to about 30 percent by weight of a mixture of thermoplastic resin and at least one oil or wax having a lower volatilizing temperature than said resin; and a carbon source material sufficient to provide from about 0.5 to about 5.0 percent by weight excess carbon, b. injection molding said mixture to produce a molded product, c. removing said thermoplastic resin by baking said molded product at a temperature between about 450° C. and about 1000° C. to produce a porous baked product, consisting of ceramic material, sintering aid and excess carbon, d. sintering said baked product at a temperature between about 2000° C. and about 2200° C. to produce a sintered prduct.
Claim 2
Dependent Claim
183 words
A process for producing a sintered carbide ceramic article comprising the steps of: a. forming a homogeneous mixture containing from about 65 to about 86 percent by weight of a sinterable carbide ceramic material; from about 0.2 to about 0.5 percent by weight of a sintering aid of boron or beryllium selected from the group of elemental beryllium, beryllium compounds, elemental boron, boron compounds, or mixtures thereof; from about 14 to about 30 percent by weight of a mixture of thermoplastic resin and at least one oil or wax having a lower volatilizing temperature than said resin; and a carbon source material sufficient to provide from about 0.5 to about 5.0 percent by weight excess carbon, b. injection molding said mixture to produce a molded product, c. removing said thermoplastic resin by baking said molded product at a temperature between about 450° C. and about 1000° C. to produce a porous baked product, consisting of ceramic material, sintering aid and excess carbon, d. sintering said baked product at a temperature between about 2000° C. and about 2200° C. to produce a sintered prduct.
Claim 3
Dependent Claim
14 words
The process of claim 1 wherein the sinterable carbide ceramic material is silicon carbide.
Claim 4
Dependent Claim
13 words
The process of claim 2 wherein the silicon carbide is predominantly alpha phase.
Claim 5
Dependent Claim
14 words
The process of claim 2 wherein the silicon carbide is substantially entirely alpha phase.
Claim 6
Dependent Claim
11 words
The process of claim 1 wherein the sintering aid contains boron.
Claim 7
Dependent Claim
12 words
The process of claim 1 wherein the sintering aid is boron carbide.
Claim 8
Dependent Claim
38 words
The process of claim 1 wherein the mixture includes a second oil or wax component volatilizing at a temperature below said thermoplastic resin, one of said oil or wax components having a lower volatilizing temperature than the other.
References Cited (Backward Citations)
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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) | 1983-11-11 | 1984-05-12 | 1984-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-11 | 1988-05-12 | 1988-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-11 | 1992-05-12 | 1992-11-11 | $7700.00 | Window Closed / Lapsed |