Patent EP0198977A1 successfully refreshed from Google Patents.
EP0198977A1
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Reinforcement of alkaline earth aluminosilicate glass-ceramics
Assignee: Corning Glass Works
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Filing: 1985-11-05
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Granted: —
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Expires: 2005-11-05
Abstract
Abstract The present invention is directed to SiC whisker and/or fiber reinforced glass-ceramic matrix composite articles wherein an alkaline earth aluminosilicate constitutes the predominant crystal phase. More particularly, the composite articles will consist essentially of 10-60% by weight SiC whiskers and/or 15-70% by volume ceramic fibers and the glass-ceramic matrix will consist essentially, by weight on the oxide basis, of The preferred predominant crystal phase is selected from the group of anorthite and its pseudo-binaries, with mullite, cordierite, barium osumilite, and albite solid solution.
Inventors
- 👤 Kenneth Chyung
- 👤 Kishor Purushottam Gadkaree
- 👤 Mark Peter Taylor
- 👤 Reid Franklin Cooper
- 👤 Ronald Leroy Stewart
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 09:28
CPC Classifications
C; C03; C03C; C03C27/00; C03C10/00; C03C10/0036; C03C14/00; C03C14/002; C03C2214/00; C03C2214/02; C03C2214/06; C03C2214/20; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/252
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
41 words
A glass-ceramic matrix composite body reinforced with SiC whiskers or SiC fibers, substantially uniformly distributed in a glass-ceramic matrix, said matrix consisting essentially, in weight percent on the oxide basis, of wherein an alkaline earth aluminosilicate constitutes the predominant crystal phase.
Claim 2
Dependent Claim
41 words
A glass-ceramic matrix composite body reinforced with SiC whiskers or SiC fibers, substantially uniformly distributed in a glass-ceramic matrix, said matrix consisting essentially, in weight percent on the oxide basis, of wherein an alkaline earth aluminosilicate constitutes the predominant crystal phase.
Claim 3
Dependent Claim
34 words
Composite body according to claim 1, characterized in that it contains 10-60 weight % deagglomerated SiC whiskers having a thickness less than 100 microns with a length to diameter ratio of at least 10.
Claim 4
Dependent Claim
16 words
Composite body according to claim l, characterized in that it contians 15-70 volume % SiC fibers.
Claim 5
Dependent Claim
96 words
Composite body according to any one of claims 1-4, characterized in that the crystal phase is selected from the group of anorthite [(Ca0,Sr0).Al 2 0 3 .2Si0 2 ] and its pseudo-binaries with mullite (3Al 2 0 3 .2SiO 2 ),anorthite with A1 2 0 3 , anorthite with Si0 2 , anorthite with CaO.Si0 2' anorthite with gehlenite (2Ca0.Al 2 0 3 .Si0 2 ), cordierite (2Mg0.2Al 2 0 3 .5Si0 2 ), barium osumilite (Ba0.2Mg0.3Al 2 0 3 .9Si0 2 ), and albite solid solution (Na 2 0.Al 2 0 3 .6Si0 2 ).
Claim 6
Dependent Claim
80 words
A fiber and whisker reinforced glass-ceramic matrix hybrid composite body consisting essentially of about 15-70% by volume fibers selected from the group of SiC, graphite, B 4 C, BN, mullite, spinel, Zr0 2 , zircon, glass, and alumina and 10-60% by weight deagglomerated SiC whiskers having a thickness less than 100 microns with a length-to-diameter ratio of at least 10 substantially uniformly distributed in a glass-ceramic matrix consisting essentially, expressed in terms of weight percent on the oxide basis, of
Claim 7
Dependent Claim
80 words
A fiber and whisker reinforced glass-ceramic matrix hybrid composite body consisting essentially of about 15-70% by volume fibers selected from the group of SiC, graphite, B 4 C, BN, mullite, spinel, Zr0 2 , zircon, glass, and alumina and 10-60% by weight deagglomerated SiC whiskers having a thickness less than 100 microns with a length-to-diameter ratio of at least 10 substantially uniformly distributed in a glass-ceramic matrix consisting essentially, expressed in terms of weight percent on the oxide basis, of
Claim 10
Dependent Claim
157 words
Method of making the composite body of claims 1 and 2, characterized by (a) mixing said whiskers with a polar solvent under such conditions that a suspension is produced which is substantially free from agglomeration; (b) melting a batch for a glass consisting essentially, expressed in terms of weight percent on the oxide basis, of (c) cooling the melt to a glass body; (d) comminuting said glass body to a fine powder; (e) mixing said glass powder into said whisker-containing suspension to produce a homogeneous dispersion of whiskers and glass particles; (f) drying said mixture of whiskers and glass powder; (g) forming said mixture of whiskers and glass powder into a shape of a desired configuration; and (h) consolidating said shape into an integral body and crystallizing said body into a glass-ceramic, wherein an alkaline earth aluminosilicate constitutes the predominant I crystal phase, by heating to an elevated temperature, but below the liquidus temperature of the glass.
Claim 11
Dependent Claim
115 words
Method of making the composite body of claims 1 and 3, characterized by (a) melting a batch for a glass consisting essentially, expressed in terms of weight percent on the oxide basis, of (b) cooling the melt to a glass body; (c) comminuting said glass body to a fine powder; (d) implanting SiC fibers in said glass powder; (e) forming said glass powder with implanted SiC fibers into a shape of a desired configuration; and then (f) consolidating said shape into an integral body and crystallizing said body into a glass-ceramic, wherein an alkaline earth aluminosilicate constitutes the predominant crystal phase, by heating to an elevated temperature, but below the liquidus temperature of the glass.
Claim 12
Dependent Claim
23 words
Method according to claim 6, characterized in that said mixing of whiskers with a polar solvent is carried out with a shearing action.
Claim 13
Dependent Claim
19 words
Method according to claim 6, characterized in that said polar liquid consists of a mixture of water and isopropanol.
Claim 14
Dependent Claim
45 words
Method according to claims 6 and 7, characterized in that said mixture of glass powder and whiskers or fibers is shaped by extruding, dry pressing, hot pressing, hot isostatic pressing, and simultaneously or subsequently is consolidated into an integral body and crystallized into a glass-ceramic.
Claim 15
Dependent Claim
19 words
Method according to claim 10, characterized in that said consolidation of said shape is conducted at temperatures about 1300°-1550°C.
Claim 16
Dependent Claim
45 words
Method according to claims 6 and 7, characterized in that after consolidating said shape into an integral body said body is heat treated at a temperature between about 1100°-1300°C for a sufficient length of time to insure complete crystallization of said glass to a glass-ceramic.
References Cited (Backward Citations)
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