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US 2006/0138717 A1Published application
Highly shock-resistant ceramic material
OwnerGerhard Wotting, Bernhard Caspers +3inventors
InventorsGerhard Wotting, Bernhard Caspers, Jurgen Hennicke, Hans-Jurgen Thoma, Lutz Frassek
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Abstract
Ceramic material of high impact strength, in particular based on Si3N4 or ZrO2, having an HV10 hardness of not more than 15.5 GPa and an E modulus at room temperature of less than 330 GPa, wherein the material contains 0.2 to 5 wt. % of carbon particles which have a maximum particle size of 5 μm, a process for the preparation of the ceramic material and the use thereof, in particular as roller bodies in bearings.
Claims12
A ceramic material comprising,
- 0.2 to 5 wt. % of carbon particles having a maximum particle size of 5 μm, wherein said ceramic material has,
- an HV10 hardness of not more than 15.5 GPa, and
- an E modulus at room temperature of less than 330 GPa.
A process of preparing a ceramic material comprising
- 0.2 to 5 wt. % of carbon particles having a maximum particle size of 5 μm,
- wherein said ceramic material has, an HV10 hardness of not more than 15.5 GPa, and an E modulus at room temperature of less than 330 GPa, said process comprising the steps of:
- providing raw materials;
- subjecting the raw materials to wet grinding thereby forming wet around raw materials;
- adding one or more organic additives to said wet ground raw materials, thereby forming intermediate wet around materials;
- drying and granulating the intermediate wet around materials;
- and
- shaping the dried and granulated intermediate wet around materials by means of heating and heating of the organic additives,
- wherein process conditions are selected such that carbon particles are separated out, and said ceramic material is free of at least one of macroscopic defects larger than 20 μm and optical heterogeneities larger than 50 μm.
6 more elements
Dependencies are inferred from the claim text.