Process parameter dependent characteristics of centrifugally formed HTS Bi-2212 tubes

HTS Bi-2212 tubes were fabricated in terms of many different processing parameters by Centrifugal Forming Method. Initially powder was melted by induction heating. The optimum range of melting temperatures and mold preheating temperature were 1050/spl deg/C/spl sim/1100/spl deg/C and 500/spl deg/C for 30 min respectively. The nominal mold rotating speed was 1,000 rpm. A tube was annealed at 840/spl deg/C for 80 Hrs in oxygen atmosphere. The plates like grains more than 40 /spl mu/m were well developed along the rotating direction of mold. It was found that the tube processed with higher mold preheating temperature and faster rate of mold rotation speed shows better electric characteristics as compared with the tube normally processed. Uniform tube fabrication is one of the critical issues to satisfy the simultaneous quenching for the successful application in the resistive SCFCL.