EP0094731A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Shaped ceramics
Assignee: Westinghouse Electric Corp
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Filing: 1983-01-17
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Granted: —
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Expires: 2003-01-17
Abstract
Abstract A ceramic composition, for shaped articles having about 0.45 to about 5.5 percent of an organic water-soluble binder which has a thermal decomposition temperature of about 100 to about 500°C and a viscosity of less than about 10,000 poises at 20°C, about 1.5 to about 4.0 percent of a starch which has a thermal decomposition temperature of about 250 to about 535°C where the thermal decomposition temperature of the binder and the starch are at least about 50°C apart, about 1.5 to about 3.5 percent cellulose, about 0.5 to about 2.0 percent of a dispersant, and about 7 to about 11 percent water, and about 75 to about 89 percent of a high temperature refractory material such as stabilized zirconia. The composition is de-aired, formed into a shape, and fired to produce a ceramic structure.
Inventors
- 👤 Yoshio Ichikawa
- 👤 George Michael Halgas
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 04:36
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/626; C04B35/63; C04B35/632; C04B35/634; C04B35/63404; C04B35/63416; C04B35/01; C04B35/48; C04B35/486; C04B35/636; C04B35/6365; C04B35/64; H; H01; H01M; H01M8/00; H01M8/10; H01M8/12; H01M8/1231; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
118 words
A ceramic composition, for a shaped article, comprising about 0.45 to about 5.5 percent of an organic water-soluble binder which has a thermal decomposition temperature of about 100 to about 500°C and a viscosity of less than about 10,000 poises at 20°C, about 1.5 to about 4.0 percent of a starch which has a thermal decomposition temperature of about 250 to about 535°C, where the thermal decomposition temperature of said binder and said starch are at least about 50°C apart, about 1.5 to about 3.5 percent of cellulose, about 0.5 to about 2.0 percent of a dispersant, about 7 to about 11 percent of water, and about 75 to about 89 percent of a high temperature refractory material.
Claim 2
Dependent Claim
118 words
A ceramic composition, for a shaped article, comprising about 0.45 to about 5.5 percent of an organic water-soluble binder which has a thermal decomposition temperature of about 100 to about 500°C and a viscosity of less than about 10,000 poises at 20°C, about 1.5 to about 4.0 percent of a starch which has a thermal decomposition temperature of about 250 to about 535°C, where the thermal decomposition temperature of said binder and said starch are at least about 50°C apart, about 1.5 to about 3.5 percent of cellulose, about 0.5 to about 2.0 percent of a dispersant, about 7 to about 11 percent of water, and about 75 to about 89 percent of a high temperature refractory material.
Claim 3
Dependent Claim
13 words
A composition as claimed in Claim 1 wherein said binder is polyvinyl alcohol.
Claim 4
Dependent Claim
14 words
A composition as claimed in Claim 1 or 2 wherein said starch is cornstarch.
Claim 5
Dependent Claim
24 words
A composition as claimed in any one of Claims 1 to 3 wherein said cellulose has a particle size less than about 200 mesh.
Claim 6
Dependent Claim
22 words
A composition as claimed in any one of Claims 1 to 4 wherein said dispersant is ammonia neutralized condensed naphthalene sulfonic acid.
Claim 7
Dependent Claim
19 words
A composition as claimed in any one of Claims 1 to 5 wherein said refractory material is stabilized zirconia.
Claim 8
Dependent Claim
14 words
A composition as claimed in Claim 6 wherein said zirconia is stabilized with calcia.
Claim 9
Dependent Claim
123 words
A composition as claimed in any one of. claims 1 to 7, including about 0.75 to about 4.0 percent of an organic water-soluble binder which has a thermal decomposition temperature of about 100 to about 500°C and a viscosity of less than about 10,000 poises at 20°C, about 3.0 to about 3.5 percent of a starch which has a thermal decomposition temperature of about 250. to about 535°C, where the thermal decomposition temperature of said binder and said starch are at least about 50°C apart, about 2.0 to about 2.5 percent of cellulose, about 0.75 to about 1.5 percent of a dispersant, about 8 to about 10 percent of water, and about 79 to about 85 percent of a high temperature refractory material.
Claim 10
Independent Claim
44 words
A method of making a shaped ceramic article comprising the steps of preparing a composition as claimed in any one of Claims 1 to 8, forming said composition into a predetermined shape, and firing said composition at a temperature above its ceramic conversion temperature.
Claim 11
Dependent Claim
30 words
A method as claimed in Claim 9 wherein the starch, cellulose, dispersant, and refractory material are initially mixed and then added to a solution of the binder in the water.
Claim 12
Independent Claim
25 words
A method as claimed in to Claims 9 or 10 wherein said composition is extruded into the shape of a tube of circular cross section.
Claim 13
Independent Claim
71 words
A method as claimed in any one of Claims 9 to 11 wherein a plug of said composition containing refractory material previously fired at a higher temperature is placed in one end of said cylinder and a collar of said composition containing a refractory material previously fired at a lower temperature is placed around the other end of said cylinder, and said cylinder is hung vertically from said collar during firing.
Claim 14
Independent Claim
38 words
A method as claimed in any one of Claims 9 to 12 wherein said refractory material is a mixture of a refractory material fired at two different temperatures and said extruded composition is fired at an intermediate temperature.
Claim 15
Dependent Claim
19 words
A method as claimed in Claim 13 including the additional step of de-airing said composition prior to firing it.
Claim 16
Independent Claim
21 words
A method as claimed in any one of Claims 9 to 14 wherein said composition is fired at slowly increasing temperatures.
Claim 17
Dependent Claim
17 words
A ceramic article fired from a composition as claimed in any one of claims 1 to 8.
Claim 18
Independent Claim
20 words
A method of making a ceramic shaped article, substantially as hereinbefore described and illustrated with reference to the accompanying drawing.
Claim 19
Independent Claim
20 words
A method of making a ceramic shaped article, substantially as hereinbefore described and illustrated with reference to the accompanying drawing.
References Cited (Backward Citations)
No citation records indexed.
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