The powder-in-tube process has been widely used to fabricate long lengths of Bi 2 Sr 2 CaCu 2 O 8 (Bi-2212) superconducting wires and tapes. However, there is not a good understanding of the processing variables involved in the wire-drawing process. Recent studies indicated that powder characteristics, such as particle size distribution and morphology, had a significant effect on the consolidation behaviour of Bi-2212 green compacts. In this investigation, silver-clad Bi-2212 composite wires containing powders of two different particle sizes were fabricated. The effects of initial packing density and sheath thickness on the characteristics of the wires, including elongation, silver:core ratio and relative core density, were investigated. It is observed that coarse powders with a wide particle size distribution produce wires with higher core density and a moderate benefit is obtained from higher initial powder packing density.
U n i v e r s i t y , Hamilton, O n t a r i o , Canada. ABSTRACT Herein i s r e p o r t e d a s t a t i s t i c a l e v a l u a t i o n of two common methods of determining t h e molecular weight c a l i b r a t i o n c u r v e u s i n g broad molecular weight d i s t r i b u t i o n s t a n d a r d s . A Monte-Carlo s i m u l a t i o n technique w a s employed t o i n v e s t i g a t e and compare e r r o r propagation i n t h e s e methods. It h a s been common p r a c t i c e t o e v a l u a t e methods of chromatogram i n t e r p r e t a t i o n on a n e n t i r e l y t h e o r e t i c a l b a s i s without c o n s i d e r a t i o n of e r r o r propagation in t h e c a l c u l a t i o n procedures employed i n t h e v a r i o u s methods. It i s p o s s i b l e f o r a method which has a sounder t h e o r e t i c a l b a s i s t o g i v e less r e l i a b l e r e s u l t s because of e x c e s s i v e e r r o r propagat i o n . A s t a t i s t i c a l e v a l u a t i o n of e r r o r p r o p a g a t i o n a l s o i d e n t i f i e s t h e s t e p s i n calcula'tion procedures where s e r i o u s e r r o r p r o p a g a t i o n o c c u r s l e a d i n g perhaps t o a l t e r n a t e and improved c a l c u l a t i o n p a t h s . The a n a l y s i s of s e v e r a l s o u r c e s of e r r o r i s p r e s e n t e d i n d e t a i l i n c l u d i n g propagation e r r o r s due t o e r r o r s i n t h e molecular weight a v e r a g e s of t h e broad molecular weight d i s t r i b u t i o n s t a n d a r d s and chromatogram r e p l i c a t i o n e r r o r .
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