Sinter bonded ceramic articles
AssigneeSaint-Gobain Ceramics & Plastics, Inc.
InventorsLawrence M. Banach, John M. Bevilacqua, Steven W. Lanzone
Life of this patent
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Abstract
A sintered ceramic article includes a silicon carbide tube and a silicon carbide base component circumscribing at least a portion of the tube and sinter-bonded to the tube. The sinter bond between the tube and the base component is defined as an interface bond and includes no bond materials. The interface bond has at least one of the following performance characteristics: a Shear Strength not less than about 25 MPa, a Nitrogen Seal Performance of not greater than 10%, a Helium Seal Performance of not greater than 10%, and/or a Vacuum Seal Performance of not greater than 10%.
Claims20
A sintered ceramic article, comprising:
- a) a first component including silicon carbide;
- b) a second component including silicon carbide, the second component circumscribing at least a portion of the first component;
- and
- c) an interface between the first component and the second component, the interface being a sinter bond and having at least one performance characteristic selected from the group consisting of:
- i) a Shear Strength not less than about 25 MPa;
- ii) a Nitrogen Seal Performance of not greater than 10%;
- iii) a Helium Seal Performance of not greater than 10%;
- iv) a Vacuum Seal Performance of not greater than 10%.
A sintered ceramic article, comprising:
- a plurality of ceramic tubes;
- a tube sheet having holes,
- wherein each tube of the plurality of ceramic tubes is sinter bonded to the tube sheet along an interface at an inside surface of a respective hole of the tube sheet, the interface between each ceramic tube of the plurality of ceramic tubes being free of bond materials, and
- wherein each interface has at least one performance characteristic selected from the group consisting of:
- i) a Shear Strength not less than about 25 MPa;
- ii) a Nitrogen Seal Performance of not greater than 10%;
- iii) a Helium Seal Performance of not greater than 10%;
- iv) a Vacuum Seal Performance of not greater than 10%.
A method of forming a sintered ceramic article, comprising:
- forming a green first component;
- pre-sintering the green first component to form a sintered first component;
- surface cleaning at least a portion of an outer surface of the sintered first component to remove surface contaminants therefrom;
- arranging a second component to circumscribe the sintered first component along the portion subjected to surface cleaning, the second component being in an un-sintered state or a partially sintered state;
- and
- sintering the first component together with the second component to form a sinter bond between the first component and the second component.
Dependencies are inferred from the claim text.