ハイブリッドシュリンクフィッタを用いたセラミックスと金属の締りばめ　接合強度の測定

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  • Shrink Fit between Ceramic and Metal with the Use of a Hybrid Shrink Fitter. Measurements of Fitting Strengths.
  • ハイブリッド シュリンクフィッタ オ モチイタ セラミックス ト キンゾク ノ

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The shrink fitter improves the fitting strength of the shrink-fitted assembly between a ceramic shaft and a metal ring. For a thinner shrink fitter in the radial direction, a material which has a coefficient of thermal expansion as high as possible and an appropriate mechanical strength at the elevated temperature is needed. In this paper, a new type of shrink fitter, "a hybrid shrink fitter", containing liquid such as a fusible alloy, has been proposed. The specimen matcrials are Al2O3 and Si3N4 for the shafts, SUS304 for casings of the shrink fitter and SUS403 for the metal rings. Fitting strengths were measured at a temperature range of room temperature up to 600°C. The fitting strengths decreased with temperature up to 200°C or 300°C and increased at higher temperatures. It was found that the hybrid shrink fitter had a higher apparent coefficient of thermal expansion than the monolithic shrink fitter. The effect of the number of slits on the fitting strength at elevated temperature was also studied. The slit was essential in improving the fitting strength. The number of slits did not affect the fitting strength-temperature relationship if the number was 2 or more. The longevity of the hybrid shrink fitter was less than that of the monolithic shrink fitter. The reasons for the shorter life of the hybrid shrink fitter were discussed.

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