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US4769349A
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US
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Ceramic fiber casting
Assignee: General Electric Co
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Filing: 1986-12-03
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Granted: 1988-09-06
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Expires: 2006-12-03
Abstract
Abstract A process for producing a slip cast ceramic body which comprises preparing a slip comprised of a suspension of ceramic material in a liquid vehicle, said ceramic material being comprised of a mixture of whiskers and particulates wherein the volume ratio of whiskers to particulates ranges from about 1:5 to about 1:1, said ceramic material being present in an amount greater than 4% by volume of the slip, said whiskers being present in an amount greater than about 2% by volume of said slip, and casting the slip in a porous mold.
Inventors
- 👤 William B. Hillig
- 👤 Henry C. McGuigan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:35
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/71; C04B35/78; C04B35/80; C04B35/01; C04B35/08; C04B35/10; C04B35/111; C04B35/117; C04B35/16; C04B35/515; C04B35/56; C04B35/5607; C04B35/5611; C04B35/5622; C04B35/565; C04B35/58; C04B35/584; C04B35/622; C04B35/626; C04B35/62605; C04B35/6261; C04B35/62625; C04B35/6263; C04B35/6264; C04B35/63; C04B35/632; C04B35/653; C04B38/00; C04B38/0051; C04B38/0058; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/32; C04B2235/3205; C04B2235/3213; C04B2235/50; C04B2235/52; C04B2235/5208; C04B2235/5216; C04B2235/522; C04B2235/5224; C04B2235/524; C04B2235/5244; C04B2235/526; C04B2235/5264; C04B2235/5276; C04B2235/5296; C04B2235/54; C04B2235/5418; C04B2235/5436; C04B2235/5445; C04B2235/5463; C04B2235/60; C04B2235/602; C04B2235/6027; C04B2235/608; C04B2235/65; C04B2235/658; C04B2235/70; C04B2235/74; C04B2235/77; C04B2235/80; Y; Y10; Y10S; Y10S264/00; Y10S264/19
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
336 words
A process for producing a slip cast ceramic body having an open porosity ranging from about 30% by volume to about 90% by volume of said body which consists essentially of preparing a slip consisting essentially of ceramic material suspended in a liquid vehicle, said ceramic material consisting essentially of a mixture of fibers and particulates, said fibers having an aspect ratio ranging from about 10 to less than about 200 and being selected from the group consisting of aluminum oxide, beryllium oxide, silicon carbide, silicon nitride, titanium carbide, zirconium carbide and a mixture thereof, said particulates being filler particulates selected from the group consisting of aluminum oxide, beryllium oxide, silicon carbide, silicon nitride, titanium carbide, zirconium carbide and a mixture thereof, the volume ratio of said fibers to said particulates ranging from about 1:5 to about 1:1, said particulates having an equivalent diameter ranging from greater than about 0.2 μ to less than about 3 μ, the ratio of the largest to the smallest dimension of said particulates being less than about 10 and the largest dimension of said particulates being less than about 1/2 of the length of said fibers, said ceramic material being present in an amount ranging from greater than about 4% by volume to about 30% by volume of the total volume of said slip, said fibers being present in an amount greater than about 2% by volume of the total volume of said slip, providing a porous mold, casting the slip into the mold to extract said liquid vehicle producing said slip cast body, and recovering said slip cast body, said slip cast body being of simple, hollow and/or complex shape, said slip cast body being useful in producing a ceramic composite which does not differ significantly in shape and size therefrom and which is comprised of a continuous matrix phase and a discontinuous filler phase, said slip cast body being characterizable as being infiltratable with molten ceramic infiltrant to produce said composite wherein said infiltrant forms said matrix phase.
Claim 2
Dependent Claim
336 words
A process for producing a slip cast ceramic body having an open porosity ranging from about 30% by volume to about 90% by volume of said body which consists essentially of preparing a slip consisting essentially of ceramic material suspended in a liquid vehicle, said ceramic material consisting essentially of a mixture of fibers and particulates, said fibers having an aspect ratio ranging from about 10 to less than about 200 and being selected from the group consisting of aluminum oxide, beryllium oxide, silicon carbide, silicon nitride, titanium carbide, zirconium carbide and a mixture thereof, said particulates being filler particulates selected from the group consisting of aluminum oxide, beryllium oxide, silicon carbide, silicon nitride, titanium carbide, zirconium carbide and a mixture thereof, the volume ratio of said fibers to said particulates ranging from about 1:5 to about 1:1, said particulates having an equivalent diameter ranging from greater than about 0.2 μ to less than about 3 μ, the ratio of the largest to the smallest dimension of said particulates being less than about 10 and the largest dimension of said particulates being less than about 1/2 of the length of said fibers, said ceramic material being present in an amount ranging from greater than about 4% by volume to about 30% by volume of the total volume of said slip, said fibers being present in an amount greater than about 2% by volume of the total volume of said slip, providing a porous mold, casting the slip into the mold to extract said liquid vehicle producing said slip cast body, and recovering said slip cast body, said slip cast body being of simple, hollow and/or complex shape, said slip cast body being useful in producing a ceramic composite which does not differ significantly in shape and size therefrom and which is comprised of a continuous matrix phase and a discontinuous filler phase, said slip cast body being characterizable as being infiltratable with molten ceramic infiltrant to produce said composite wherein said infiltrant forms said matrix phase.
Claim 3
Dependent Claim
22 words
The process according to claim 1 wherein said fibers have an aspect ratio ranging from about 20 to less than about 100.
Claim 4
Dependent Claim
15 words
The process according to claim 1 wherein said fibers are crystalline whiskers of silicon carbide.
Claim 5
Dependent Claim
27 words
The process according to claim 1 wherein said fibers are present in an amount greater than about 4% by volume of the total volume of said slip.
Claim 6
Dependent Claim
28 words
The process according to claim 1 wherein said liquid vehicle is selected from the group consisting of water, methyl alcohol, ethyl alcohol, isopropyl alcohol and a mixture thereof.
Claim 7
Dependent Claim
242 words
A self-supporting slip cast body consisting essentially of a mixture of ceramic fibers and ceramic particulates, said fibers having an aspect ratio ranging from about 10 to less than about 200 and being selected from the group consisting of aluminum oxide, beryllium oxide, silicon carbide, silicon nitride, titanium carbide, zirconium carbide and a mixture thereof, said particulates being filler particulates selected from the group consisting of aluminum oxide, beryllium oxide, silicon carbide, silicon nitride, titanium carbide, zirconium carbide and a mixture thereof, the volume ratio of said fibers to said particulates ranging from about 1:5 to about 1:1, said particulates having an equivalent diameter ranging from greater than about 0.2 μ to less than about 3 μ, the ratio of the largest to the smallest dimension of said particulates being less than about 10 and the largest dimension of said particulates being less than about 1/2 of the length of said fibers, said body having an open porosity ranging from about 30% by volume to about 90% by volume of said body, said slip cast body being of simple, hollow and/or complex shape, said slip cast body being useful for producing a ceramic composite which does not differ significantly in shape and size therefrom and which is comprised of a continuous matrix phase and a discontinuous filler phase, said slip cast body being characterizable as being infiltratable with molten ceramic infiltrant to produce said composite wherein said infiltrant forms said matrix phase.
Claim 8
Dependent Claim
242 words
A self-supporting slip cast body consisting essentially of a mixture of ceramic fibers and ceramic particulates, said fibers having an aspect ratio ranging from about 10 to less than about 200 and being selected from the group consisting of aluminum oxide, beryllium oxide, silicon carbide, silicon nitride, titanium carbide, zirconium carbide and a mixture thereof, said particulates being filler particulates selected from the group consisting of aluminum oxide, beryllium oxide, silicon carbide, silicon nitride, titanium carbide, zirconium carbide and a mixture thereof, the volume ratio of said fibers to said particulates ranging from about 1:5 to about 1:1, said particulates having an equivalent diameter ranging from greater than about 0.2 μ to less than about 3 μ, the ratio of the largest to the smallest dimension of said particulates being less than about 10 and the largest dimension of said particulates being less than about 1/2 of the length of said fibers, said body having an open porosity ranging from about 30% by volume to about 90% by volume of said body, said slip cast body being of simple, hollow and/or complex shape, said slip cast body being useful for producing a ceramic composite which does not differ significantly in shape and size therefrom and which is comprised of a continuous matrix phase and a discontinuous filler phase, said slip cast body being characterizable as being infiltratable with molten ceramic infiltrant to produce said composite wherein said infiltrant forms said matrix phase.
Claim 9
Dependent Claim
22 words
The body according to claim 6 wherein said fibers have an aspect ratio ranging from about 20 to less than about 100.
References Cited (Backward Citations)
US2693668A
Cited
US3047383A
Cited
US3250833A
Cited
US3298897A
Cited
US3736159A
Cited
US3905047A
Cited
US3883359A
Cited
US4544610A
Cited
US4314852A
Cited
US4558016A
Cited
US4402750A
Cited
US4440864A
Cited
US4399231A
Cited
US4529630A
Cited
US4485179A
Cited
US4464192A
Cited
US4588699A
Cited
US4585500A
Cited
US4543345A
Cited
US4543113A
Cited
US4636480A
Cited
US4615987A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-09-06 | 1992-03-07 | 1992-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-06 | 1996-03-07 | 1996-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-06 | 2000-03-07 | 2000-09-06 | $7700.00 | Window Closed / Lapsed |