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公开(公告)号：EP4331741A1
公开(公告)日：2024-03-06
申请号：EP22795375.9
申请日：2022-03-22
摘要： According to one embodiment, a tungsten wire includes a tungsten alloy containing rhenium. The tungsten wire includes a protrusion peak density (Spd) of 7000 or more and 11000 or less as a surface roughness parameter.
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公开(公告)号：EP4306670A1
公开(公告)日：2024-01-17
申请号：EP22766984.3
申请日：2022-03-03
发明人： AOYAMA, Hitoshi , BABA, Hideaki , TOMOKIYO, Kenji
IPC分类号： C22C27/04
摘要： By homogenizing the Re content in any cross-section of a ReW wire rod body, it is possible to realize a ReW wire rod which has no variation in material quality, secures mechanical properties, and greatly contributes to improvement of the stability of the thermoelectromotive force. ReW usually adopts a powder metallurgy method in which powders are mixed, molded and sintered. Since sintering of ReW proceeds due to solid-phase diffusion, a phase region in which a Re composition ratio is locally high (i.e., a segregated phase of a σ phase) is generated in accordance with the particle size distribution of the powders, the mixing state, and the molding and sintering conditions. If a sintered body having such large variation in the Re composition is processed into a rod or a wire (wire rod), inhomogeneity due to the variation (fluctuation) of the amount of Re occurs in a cross-section in the processing direction or a cross-section perpendicular to the axial direction. The rhenium tungsten wire rod according to an embodiment is a wire rod made of a tungsten alloy containing rhenium, wherein a rhenium content is less than 30 wt% in any measurement area of a wire rod body where a unit area is 1 um in diameter.
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公开(公告)号：EP4295973A1
公开(公告)日：2023-12-27
申请号：EP22756086.9
申请日：2022-02-10
发明人： AOYAMA, Hitoshi , BABA, Hideaki , TOMOKIYO, Kenji
IPC分类号： B22F5/12 , C22C27/04 , C23C28/02 , C22C1/04 , C22F1/00 , C22F1/18 , C23C8/12 , C23C8/64 , C23C24/08 , B22F3/24 , B21C1/00 , B21C37/04
摘要： A tungsten wire according to an embodiment is a tungsten wire made of a W alloy containing rhenium, and includes a mixture on at least a part of a surface thereof, the mixture contains W, C, and O as constituent elements, and taking a radial cross-sectional thickness of the mixture as A mm and a diameter of the tungsten wire as B mm, an average value of a ratio A/B of A to B is 0.3% to 0.8%.
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公开(公告)号：EP4379082A1
公开(公告)日：2024-06-05
申请号：EP22849491.0
申请日：2022-07-26
发明人： AOYAMA, Hitoshi , BABA, Hideaki , TOMOKIYO, Kenji
摘要： According to one embodiment, there are provided a tungsten wire, and a tungsten wire processing method and an electrolytic wire using the tungsten wire, which can improve situations of crack occurrence during a thinning process by controlling crystal orientations in a medium wire having a diameter of 0.3 to 1.2 mm. The tungsten wire includes a tungsten alloy containing rhenium. According to an EBSD analysis on a unit area, crystalline orientations having an orientation difference of 15 degrees or less from , which is parallel to a wire drawing direction, account for an area ratio of 70% or more and 90% or less to a measurement field on an IPF map. The unit area is a 40 µm × 40 um area located within a range of 100 µm concentrically extending from a central axis in a cross-section along a wire radial direction, which is perpendicular to the wire drawing direction.
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