The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 26, 1988
Filed:
Apr. 07, 1986
Wolfhart Rieger, Buch, CH;
Jakob Widrig, Winterthur, CH;
Metoxit AG, Thayngen, CH;
Abstract
The tensile loading of a ceramic-metal joint, made by shrink-fit locking a cylindrical ceramic component into a flange of ferrous material in the axial direction of the ceramic component can be improved by undersizing the diameter D of the bore of the flange by 13-27 .mu.m making it, at room temperature, this much smaller than the diameter d of that part of the ceramic component to be attached to the flange by shrink-fit locking, by preparing the cylindrical surface of the said part of the ceramic component with a surface roughness Ra of 0.05-0.2 .mu.m and the surface of the bore in the flange with a roughness Ra of 0.4-0.8 .rho.m, and by heating the flange, before fitting it to the ceramic part, to a temperature such that, after fitting together the ceramic component and the flange, the resultant stresses produced on cooling the assembly to room temperature are below the yield strength R.sub.po.2 of the ferrous material, and the said temperature of heating is below the Wohler temperature of the ceramic material.