Dense and 2223 single-phase bulk bars of approximately 0.3 mm 2 cross-section were fabricated by uniaxial hot pressing. Effects of preliminary annealing and intermediate grinding on the properties of hot pressed bars are discussed. Optimal structure and physical properties were obtained for preliminary annealing of duration 100-120 h and subsequent hot pressing under a pressure of approximately=25 MPa, and 80 h at a temperature of 850 degrees C for both processes, that resulted in highest contact measured value of J c =11500 A cm -2 at 77 K and 0 T.
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Pachla et al. (1994) studied this question.
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