Process for shrink-fitting a cylindrical ceramic part in a ferrous metallic flange, and the ceramic-metal composite body produced

摘要

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 Rpo.2 of the ferrous material, and the said temperature of heating is below the Wöhler temperature of the ceramic material.