Patent EP0275652A1 successfully refreshed from Google Patents.
EP0275652A1
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Composite ceramic article and method for making it
Assignee: Corning Glass Works
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Filing: 1987-12-08
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Granted: —
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Expires: 2007-12-08
Abstract
Abstract Oxide-coated whiskers suitable for consolidation into or incorporation within a whisker-reinforced composite ceramic article are provided by dispersing inorganic whiskers in a colloidal oxide sol, separating the dispersion into fine droplets, and drying the droplets to provide a solid particulate product comprising the coated whiskers. The continuous oxide coating on the whiskers provides protection and aids in composite consolidation.
Inventors
- 👤 Reid Franklin Cooper
- 👤 Kishor Purushottam Gadkaree
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 14:53
CPC Classifications
C; C03; C03C; C03C14/00; C04; C04B; C04B35/00; C04B35/01; C04B35/10; C04B35/111; C04B35/117; C04B35/16; C04B35/18; C04B35/185; C04B35/195; C04B35/622; C04B35/626; C04B35/628; C04B35/62844; C04B35/62847; C04B35/62849; C04B35/62852; C04B35/62855; C04B35/62892; C04B35/62897; C04B35/64; C04B35/645; C04B35/71; C04B35/78; C04B35/80; C03C2214/00; C03C2214/06; C03C2214/32; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/32; C04B2235/3205; C04B2235/3208; C04B2235/3217; C04B2235/34; C04B2235/3418; C04B2235/44; C04B2235/441; C04B2235/50; C04B2235/52; C04B2235/5208; C04B2235/5216; C04B2235/522; C04B2235/5224; C04B2235/524; C04B2235/5244; C04B2235/5248; C04B2235/526; C04B2235/5276; C04B2235/70; C04B2235/96; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2904; Y10T428/2907; Y10T428/2913; Y10T428/2918; Y10T428/2982; Y10T428/2991; Y10T428/2993
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
35 words
An oxide-coated whisker product comprising individual inorganic whiskers encapsulated in an oxide coating material, the oxide coating material consisting of an inorganic oxide or mixture of oxides forming a continuous oxide coating on the whiskers.
Claim 2
Dependent Claim
35 words
An oxide-coated whisker product comprising individual inorganic whiskers encapsulated in an oxide coating material, the oxide coating material consisting of an inorganic oxide or mixture of oxides forming a continuous oxide coating on the whiskers.
Claim 3
Dependent Claim
36 words
An oxide-coated whisker product as claimed in claim 1 characterised in that the oxide coating material comprises at least one oxide selected from the group consisting of SiO₂, Al₂O₃, CaO, MgO, BaO, ZrO₂, TiO₂ and P₂O₅.
Claim 4
Dependent Claim
28 words
An oxide-coated whisker product as claimed in claim 2 characterised in that the inorganic whiskers are whiskers selected from the group of SiC, Si₃N₄, C and Al₂O₃ whiskers.
Claim 5
Dependent Claim
27 words
An oxide-coated whisker product as claimed in claim 3 characterised in that it has an average particle size less than the maximum length of the inorganic whiskers.
Claim 6
Dependent Claim
40 words
An oxide-coated whisker product as claimed in claim 1 characterised in that the oxide coating material comprises at least two oxides, present in unreacted form, selected from the group consisting of SiO₂, Al₂O₃, CaO, MgO, BaO, ZrO₂, TiO₂ and P₂O₅.
Claim 7
Dependent Claim
34 words
An oxide-coating whisker product as claimed in claim 4 or claim 5 characterised in that the thickness of th eoxide coating material does not exceed about 3 times the diameter of the inorganic whiskers.
Claim 8
Independent Claim
107 words
A method for making an oxide-coated whisker product comprising individual inorganic whiskers encapsulated in an oxide coating material which comprises the steps of: (a) providing a liquid sol comprising a liquid vehicle containing colloidal particles of at least one oxide selected from the group consisting of SiO₂, Al₂O₃, CaO, MgO, BaO, ZrO₂, TiO₂ and P₂O₅; (b) combining the sol with an inorganic whisker component to form a liquid suspension consisting essentially of a dispersion of the whiskers in the sol; and (c) separating the liquid dispersion into droplets and removing the liquid vehicle from the droplets to provide a solid particulate material comprising the oxide-coated whisker product.
Claim 9
Independent Claim
107 words
A method for making an oxide-coated whisker product comprising individual inorganic whiskers encapsulated in an oxide coating material which comprises the steps of: (a) providing a liquid sol comprising a liquid vehicle containing colloidal particles of at least one oxide selected from the group consisting of SiO₂, Al₂O₃, CaO, MgO, BaO, ZrO₂, TiO₂ and P₂O₅; (b) combining the sol with an inorganic whisker component to form a liquid suspension consisting essentially of a dispersion of the whiskers in the sol; and (c) separating the liquid dispersion into droplets and removing the liquid vehicle from the droplets to provide a solid particulate material comprising the oxide-coated whisker product.
Claim 10
Dependent Claim
32 words
A method as claimed in claim 7 characterised in that the liquid suspension further comprises a dissolved oxidizable compound of a metal selected from the group consisting of CaO, MgO and BaO.
Claim 11
Dependent Claim
33 words
A method as claimed in claim 7 or claim 8 characterised in that the inorganic whisker component consists essentially of whiskers selected from the group consisting of SiC, Si₃N₄, C and Al₂O₃ whiskers.
Claim 12
Dependent Claim
30 words
A method as claimed in claim 9 characterised in that the inorganic whisker component constitutes 10-70 volume percent of the total volume of whiskers and colloidal particles in the sol.
Claim 13
Dependent Claim
21 words
A method as claimed in claim 10 characterised in that the solid particulate material is produced by spray-drying the liquid dispersion.
Claim 14
Dependent Claim
48 words
A method as claimed in claim 11 characterised in that it includes the further step of collecting the oxide-coated whiskers from the solid particulate material in a size fraction of the solid particulate material having an average particle size not exceeding the maximum length of the inorganic whiskers.
References Cited (Backward Citations)
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