PHYSICAL AND MECHANICAL-PROPERTIES OF YBA2CU3O7-DELTA SUPERCONDUCTORS

被引:99
作者
ALFORD, NM [1 ]
BIRCHALL, JD [1 ]
CLEGG, WJ [1 ]
HARMER, MA [1 ]
KENDALL, K [1 ]
JONES, DH [1 ]
机构
[1] UNIV LIVERPOOL,DEPT PHYS,LIVERPOOL L69 3BX,ENGLAND
关键词
CERAMIC MATERIALS - Sintering - CERAMIC PRODUCTS - Mechanical Properties - CRYSTALS - Microstructure - FRACTURE MECHANICS - MICROSCOPIC EXAMINATION - Scanning Electron Microscopy;
D O I
10.1007/BF01153964
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The physical and mechanical properties of YBa//2Cu//3O//7// minus // delta superconductors are examined. These properties are related to powder preparation method, powder characteristics, sintering behaviour and sintered microstructure. The sintering atmosphere and sintering schedules affect the final microstructure very strongly and determine, in conjunction with starting powder characteristics, the sintered density. The mechanical properties such as Young's Modulus, bend strength and critical stress intensity factor fracture toughness are measured and related to microstructure as determined by scanning electron microscopy. Control of microstructure by careful powder selection and sintering schedule is seen as key to optimizing the physical and mechanical properties of the material. Finally attention is drawn to fabrication techniques and how these must be optimized in order to realize the mechanical properties which are necessary if these are to be useful as engineering materials. Comparisons between fabrication techniques show that uniaxial powder pressing suffers from limitations in terms of specimen complexity and densification whereas the favoured route, termed viscous processing, gives a more homogeneous microstructure, higher strength and allows near theoretical density to be achieved.
引用
收藏
页码:761 / 768
页数:8
相关论文
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