REPARATION OF FINE WIRES OF HYDROGEN STORAGE ALLOY WITH FINE CRYSTAL GRAIN BY THE IN-ROTATING-WATER SPINNING METHOD

水内旋转纺丝法修复细晶粒储氢合金细丝

• 批准号: 11555060
• 负责人: HONDA Hiroshi
• 金额: $ 8.64万
• 依托单位: KYUSHU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B).
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11555060/
• 关键词: Hydrogen Storage Alloy; Rapid Solidification; In-Rotating-Water Spinning Method; Immersion Cooling; Fine Wire; Crystalline Size Control

Studies were conducted to prepare a fine wire of hydrogen storage alloy by the In-Rotating-Water Spinning Method. In the first fiscal year, preliminary tests were conducted to melt alloy samples in a nozzle by induction heating and to eject the melt through the nozzle by argon back pressure. A Mm-Ni based alloy system and two Ti-Zr based alloy systems were employed as the test materials. A quartz nozzle with the mouth diameter of 0.25 mm was used. The capacity of a high-frequency induction heating apparatus(200 kHz, 5kW) was large enough to melt the Mm-Ni based alloy system but it was not enough for the Ti-Zr based alloy systems. The melt of Mm-Ni based alloy did not eject through the nozzle when the back pressure of 0.35 MPa was pressed by argon gas. This was due to the existence of slug in the melt formed by the reaction with the quartz nozzle. Then, nozzles made of carbon and alumina were tested. However, both of them were not satisfactory for the present purpose. A theoretical stud … More y on the occurrence of the minimum-heat-flux point that plays an important role during the rapid quenching process was also conducted. In the second fiscal year, an induction heating apparatus with a larger frequency(400 kHz, 5 kW) and a new induction coil were introduced. The mouth diameter of the quartz nozzle was changed to 0.5 mm. The test alloy was also changed to LaNi_5. The LaNi_5 alloy of 3 g was heated to 1450 ℃ in the nozzle and was completely melted. Then it was injected into the water layer of 1.5 mm in depth that was formed on the inside surface of a drum rotating at a velocity of 7 m/s and rapidly solidified. The geometrical shape of the product was about 30-cm long wires of 0.15 to 0.5 mm in diameter, ribbons with different lengths, or small droplets. The optimum back pressure for obtaining a thin wire was 0.3 MPa. The PCT diagram of the product showed a steeper pressure plateau than the ingot and the hydrogen-storage capacity decreased to about 70% of the latter. It was also found that the sample of alloy that was melted and then solidified gradually in quartz nozzle showed the PCT diagram similar to that of the product. The SEM view and the composition analysis by ESCA of the product showed that 2 μm thick layer of oxide was formed on the surface. However, this amount was small enough. Thus the bulk of the product was considered to be oxidized in the quartz nozzle during the melting process. According to the EPMA analysis, Ni was observed at the surface of the product. However, the composition of inner part was the same as the ingot. These results indicated that the reaction of the melt with the nozzle surface should be minimized to prevent the deterioration of the PCT characteristics. Less

研究了用旋转水纺丝法制备储氢合金细丝。在第一个财政年度，进行了初步试验，在喷嘴中通过感应加热熔化合金样品，并通过喷嘴在Ar背压下喷射熔体。试验材料为一种Mm-Ni基合金体系和两种钛-锆基合金体系。喷嘴直径为0.25 mm的石英喷嘴。高频感应加热装置(200 kHz，5kW)的功率足以熔化Mm-Ni基合金系统，但不足以熔化Ti-Zr基合金系统。当背压为0.35 Mpa时，Ar气体加压时，Mm-Ni基合金熔体不会从喷嘴中喷出。这是由于与石英喷嘴反应形成的熔体中存在段塞所致。然后，对碳和氧化铝制成的喷嘴进行了测试。然而，就目前的目的而言，这两种情况都不令人满意。一种理论研究…对在快速淬火过程中起重要作用的最小热流点的出现也进行了更多的研究。在第二个财政年度，推出了更大频率(400 kHz，5kW)的感应加热装置和新的感应线圈。将石英喷嘴的口径改为0.5 mm。试验合金也改为LaNi5。3g的LaNi5合金在喷嘴中加热到1450℃，完全熔化。然后将其注入到以7m/S速度旋转的转鼓内表面形成的1.5 mm深的水层中，并迅速凝固。产品的几何形状为约30厘米长的直径为0.15至0.5 mm的金属丝、不同长度的带子或小液滴。获得细丝的最佳背压为0.3 Mpa。产物的相变温度图显示出比钢锭更陡峭的压力平台，储氢量下降到后者的70%左右。研究还发现，在石英喷嘴中熔化再逐渐凝固的合金样品的PCT图与产品的PCT图相似。扫描电子显微镜观察和电子能谱分析表明，产物表面形成了2μm厚的氧化层。然而，这个数额已经足够小了。因此，大部分产品被认为在熔化过程中在石英喷嘴中被氧化。EPMA分析表明，产物表面有镍的存在。但内部成分与钢锭相同。这些结果表明，应尽量减少熔体与喷嘴表面的反应，以防止PCT特性的恶化。较少

项目成果

H.Honda, H.Yamashiro and H.Takamatsu: "Stability of Vapor Film in Subcooled Film Boiling on a Shere"Proc.34th National Heat Transfer Conference, Pittsburgh. NHTC2000-12003. 1-10 (2000)

H.Honda、H.Yamashiro 和 H.Takamatsu：“谢尔过冷薄膜沸腾中蒸气薄膜的稳定性”Proc.34th 全国传热会议，匹兹堡。

H.Honda, H.Tamashiro and H.Takamatsu: "Linear Stability Analysis of Vapor Film during Subcooled Film Boiling on a Sphere"Theram Science and Engineering. 7-5. 1-10 (1999)

H.Honda、H.Tamashiro 和 H.Takamatsu：“球体过冷膜沸腾过程中蒸气膜的线性稳定性分析”Theram 科学与工程。

H.Honda, H.Yamashiro and H.Takamatsu: "Stability of Vapor Film in Subcooled Film Boiling on a Shere"Proc.34th Natinal Heat Transfer Conf.. NHTC2000-120003. 1-10 (2000)

H.Honda、H.Yamashiro 和 H.Takamatsu：“谢尔过冷膜沸腾中蒸气膜的稳定性”Proc.34th Natinal Heat Transfer Conf. NHTC2000-120003。

本田博司 山城光、高松 洋: "Stability of Vapor Film in Subcooled Film Boiling on a Sphere"Thermal Science and Engineering. 7巻5号. 1-10 (1999)

Hiroshi Honda、Hikaru Yamashiro、Hiroshi Takamatsu：“球体过冷薄膜沸腾中的蒸气薄膜的稳定性”热科学与工程，第 7 卷，第 5 期。1-10 (1999)

本田博司、山城光、高松 洋: "球まわりの過冷膜沸騰における蒸気膜の安定性"Thermal Science and Engineering. 7巻・5号. 1-10 (1999)

Hiroshi Honda、Hikaru Yamashiro、Hiroshi Takamatsu：“围绕球体沸腾的过冷膜中的蒸汽膜的稳定性”热科学与工程，第 7 卷，第 5 期。1-10 (1999)