The fitting strength between ceramic and metal with the use of an shrink fitter of bimetal at elevated temperature.

The shrink fit between a ceramic shaft and a metal ring with the use of an shrink fitter of bimetal has been developed in this paper. The fitting strengths of the shrink-fitted assemblies were measured from room temperature to 600°C. The contact pressures between the shafts and the shrink fitters of bimetal were also calculated. The ceramic shaft was Al2O3 or Si3N4. The shrink fitter was a bimetal of SUS304 and SUS403. The outer ring was SUS403. It has been shown from calculations that the shrink-fitted assembly using the shrink fitter of bimetal is somewhat weaker than that using the shrink fitter of SUS304 when the thickness of the shrink fitter in the radial direction is over 6mm. The bimetal shrink-fitted assembly was approximately 3MPa stronger than that using the shrink fitter of SUS304 at 600°C when the thickness of the shrink fitter in the radial direction was 4mm. The fitting conditions under which the bimetal shrink-fitted assembly was stronger than that using the shrink fitter of SUS304 have been discussed.