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US 2004/0018935 A1Published application
Graphite loaded silicon carbide and methods for making
AssigneeCoorsTek, Inc.
InventorEric G. Wilkins
Life of this patent
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Abstract
The invention provides exemplary silicon carbide ceramic bodies and processes for making such ceramic bodies. In one embodiment, a raw batch for producing a ceramic body includes a silicon carbide slurry and agglomerates of particles defining a dry lubricant mixture. The mixture includes a binder and a dry lubricant such as graphite, with a majority of the agglomerates having a shape that is generally spherical.
Claims27
A composite ceramic body, comprising:
- silicon carbide in major amount;
- and
- unreacted inclusions of a dry lubricant in minor amount, wherein a majority of the inclusions are substantially spherical or ellipsoidal in shape, the inclusions comprising between about two (2) percent and about twelve (12) percent of the ceramic body by volume.
A raw batch for producing a composite ceramic body, the raw batch comprising:
- a plurality of agglomerates defining a dry lubricant mixture, the mixture comprising a binder and a dry lubricant, the dry lubricant having an average particle size between about two (2) microns and about seven (7) microns;
- and
- a silicon carbide slurry;
- wherein a majority of the agglomerates have a shape that is generally spherical.
1 more element
A method of making a raw batch for producing a composite ceramic body, the method comprising:
- preparing a dry lubricant slurry;
- preparing a binder;
- mixing the dry lubricant slurry and the binder;
- and
- drying the combined dry lubricant slurry and the binder to form a dry mixture having a plurality of agglomerates;
- wherein a majority of the plurality of agglomerates have a shape that is generally spherical.
3 more elements
Dependencies are inferred from the claim text.