Y系超伝導セラミックスの低温強度および靭性

概要

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Bending and fracture toughness tests of superconducting YBaCuO ceramics were carried out at room temperature as well as at low temperature of 80K where superconductivity appeared. The materials of various densities were prepared to investigate the effects of density on strength and fracture toughness. From the test results, it was found that hardness, Young's modulus, Poisson's ratio, bending strength and fracture toughness increased with an increase in density. Bending strength and fracture toughness of the material with a final annealing temperature of 673K were higher than those of the material with a final annealing temperature of 773K. Bending strength and fracture toughness at 80K were higher than those at room temperature. No change in the resistivity of the bend specimen as well as that of the Cheveron-notched fracture toughness specimen was found during deformation at 80K: The superconductivity was not influenced by the deformation and it stood up to fracture.
社団法人日本機械学会の論文
1990-03-25