Abstract
Bars of YBa2Cu3Ox (123) and Bi2Sr2CaCu2Ox (2212) were examined at room temperature for strength in four—point bending and fracture toughness. The 123 was reinforced with 15 vol.% Y2BaCuO5 (211) fibers and processed to 90–91% density by cold pressing and sintering. The 2212 was reinforced with 15 vol.% 2212 fibers and processed to ≈90% density by sinter forging. The 123/211 composites had a fracture toughness of 1.9 MPa(m)0.5, which is 20–30% higher than that of corresponding monoliths, but exhibited no improvement in strength. The strength and fracture toughness of the 2212/2212 composites were 102 MPa and 2.7 MPa(m)0.5, respectively, which were slight improvements over those of the monoliths. Transport critical current densities at 77 K were only slightly affected by the fiber additions.
Work supported by the U.S. Department of Energy (DOE), Energy Efficiency and Renewable Energy, as part of a DOE program to develop electric power technology, and Basic Energy Sciences-Materials Sciences, under Contract W-31-109-Eng-38.
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Goretta, K.C. et al. (1994). Mechanical Properties of Fiber-Reinforced YBa2Cu3Ox and Bi2Sr2CaCu2Ox Bars. In: Reed, R.P., Fickett, F.R., Summers, L.T., Stieg, M. (eds) Advances in Cryogenic Engineering Materials . An International Cryogenic Materials Conference Publication, vol 40. Springer, Boston, MA. https://doi.org/10.1007/978-1-4757-9053-5_9
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