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2. 发明专利

FI930098A 未知
公开(公告)号：FI930098A
公开(公告)日：1994-07-12
申请号：FI930098
申请日：1993-01-11
申请人： MARC FINANCE LTD OY , KETTUNEN P , TUOTEKEHITYS OY TAMLINK
发明人： KETTUNEN PENTTI , LEPISTOE T K
IPC分类号： C23C14/08 , C30B29/62
摘要： A method for producing fibrous monocrystals, i.e. whiskers, of high-temperature superconductive ceramics in their best superconductive crystal directions, thereby in the main avoiding the production of non-superconductive fibres and also the effect which decreases the superconductivity due to relatively weak superconductive crystal directions. Whiskers are produced by means of physical gas-phase coatings (physical vapour deposition = PVD), for example using radiofrequency magnetron sputtering (RF magnetron sputtering) or by means of chemical gas-phase coatings (chemical vapour deposition = CVD). The growth underlayer, i.e. the substrate, employed is a ceramic monocrystal surface in accordance with the (100) orientation, a ceramically coated metal surface or a smoothed or polished metal surface. It is typical of the latter alternative that the coating which is formed on the metal surface initially grows in a relatively weak superconductive crystal direction but then alters its growth to the best superconductive crystal direction and is at the same time transformed into whiskers.

4. 发明专利

FI930100A 未知
公开(公告)号：FI930100A
公开(公告)日：1994-07-12
申请号：FI930100
申请日：1993-01-11
申请人： MARC FINANCE LTD OY , KETTUNEN P , TUOTEKEHITYS OY TAMLINK
发明人： KETTUNEN PENTTI , LEPISTOE T K
IPC分类号： H01Q17/00 , H05K9/00 , H05K39/14
摘要： Microscopic or macroscopic magnetic shield which is based on the use of such mono-crystalline whiskers as are obtained from high-temperature superconducting ceramics in their superconducting crystal directions. Whiskers form the superconducting part of the shield and an electrically insulating ceramic, polymer, intermetal or a metal which is a poor conductor forms its matrix which holds the whiskers together. Where the matrix or part thereof is a liquid polymer at the start of production, the shield can be painted or sprayed onto the surface of the piece which is to be protected and can solidify there to form a layer of a suitable thickness. The situation is similar when a ceramic suspension is used as an initial material for the matrix, but in this case the solidification of the matrix must be carried out by sintering. Various composite constructions containing superconducting whiskers can be used as magnetic shields, to remove electromagnetic interference and to make the shielded part invisible to radar, assuming that the temperature of the composite is suitable for making the whiskers superconductive.

5. 发明专利

FI930099A 未知
公开(公告)号：FI930099A
公开(公告)日：1994-07-12
申请号：FI930099
申请日：1993-01-11
申请人： MARC FINANCE LTD OY , KETTUNEN P , TUOTEKEHITYS OY TAMLINK
发明人： KETTUNEN PENTTI , LEPISTOE T K
IPC分类号： H01B12/00 , H01L39/24
摘要： Method of manufacturing superconductive filaments, sheets or other mouldings so that their superconductive parts originate from whiskers which are obtained from high-temperature superconductive ceramics in their most superconductive crystal directions. The matrix which encloses and protects the whiskers is of metal which is a good conductor, for example silver, or thermal plastic filled with a metal which is a good conductor or with carbon. Whiskers are packed in a pipe made of the matrix material, between two pipes or two sheets and the unit so obtained is processed to produce the final shape by extrusion, drawing (pultrusion), rolling or by some other type of processing. For plastic the processing can also be carried out by injection moulding. In addition if required the plastic can be cross-linked after processing to thermoset.

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