Processing of dense MgO substrates for high-temperature superconductors
Dedicated to Professor Dr. Dr. h. c. Manfred Rühle on the occasion of his 65th birthday
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Date
2003-03
Publication Type
Journal Article
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Abstract
Sintering of magnesium oxide ceramics to high density requires high temperatures (1500-1800 degrees C), resulting in coarse-grained microstructures, or additives that promote sintering. An alternative is to use a fine-grained MgO starting powder with an impurity level < 1 % that allows appropriate processing conditions. Here, we report about processing by slip casting, resulting in ceramic green bodies that can be sintered to closed porosity at 1600 degrees C. X-ray diffraction and scanning electron microscopy combined with energy-dispersive X-ray spectroscopy showed that the sintered bodies are single-phase. The process described here is suitable to sinter large substrates up to 200 mm x 200 mm and 96 % of the theoretical density with closed porosity. The MgO substrates are suitable for partial melt processing of high-quality Bi-2212 thick films.
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published
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Volume
94 (3)
Pages / Article No.
200 - 207
Publisher
Hanser
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Subject
MgO; Oxide superconductors; Slip casting; Sintering; Substrate; Bi-2212