本文采用真空电弧熔炼法制备了Ho0.3Tb0.3Dy0.4Fe1.93Laves相化合物,研究了其结构、磁性和磁致伸缩性能。X射线衍射实验和能谱分析结果表明,Ho0.3Tb0.3Dy0.4Fe1.93化合物呈现单一的Laves相。根据初始交流磁化率曲线确定Ho0.3Tb0.3Dy0.4F...本文采用真空电弧熔炼法制备了Ho0.3Tb0.3Dy0.4Fe1.93Laves相化合物,研究了其结构、磁性和磁致伸缩性能。X射线衍射实验和能谱分析结果表明,Ho0.3Tb0.3Dy0.4Fe1.93化合物呈现单一的Laves相。根据初始交流磁化率曲线确定Ho0.3Tb0.3Dy0.4Fe1.93化合物有两个自旋重取向温度TSR1和TSR2,分别对应易磁化方向从到和从到的转变。差示扫描量热法测量出Ho0.3Tb0.3Dy0.4Fe1.93化合物居里温度为643 K。在室温下,Ho0.3Tb0.3Dy0.4Fe1.93化合物在3 kOe和10 kOe磁场下,磁致伸缩(λ||-λ⊥)分别为810 ppm和1332 ppm。变温磁致伸缩研究表明,在3 kOe和10 kOe磁场下,磁致伸缩λ3k ≥ 500 ppm和λ10k ≥ 1000 ppm的温度跨度分别为155 K和280 K。这表明Ho0.3Tb0.3Dy0.4Fe1.9化合物具有宽温域磁致伸缩性能。In this paper, Ho0.3Tb0.3Dy0.4Fe1.93 Laves phase compounds were prepared by vacuum arc melting method, and their structural, magnetic, and magnetostrictive properties were investigated. The results of X-ray diffraction experiments and energy spectroscopic analyses showed that the Ho0.3Tb0.3Dy0.4Fe1.93 compounds exhibit a single Laves phase. The Ho0.3Tb0.3Dy0.4Fe1.93 compound was determined to have two spin reorientation temperatures, TSR1 and TSR2, based on the Initial AC magnetic susceptibility, which corresponds to transitions from to and from to in the easy magnetic directionin, respectively. Differential scanning calorimetry measured the Curie temperature of the Ho0.3Tb0.3Dy0.4Fe1.93 compound to be 643 K. At room temperature, the magnetostriction (λ||-λ⊥) of the Ho0.3Tb0.3Dy0.4Fe1.93 compounds is 810 ppm and 1332 ppm for magnetic fields of 3 kOe and 10 kOe, respectively. Variable-temperature magnetostriction studies have shown that, for magnetic fields of 3 kOe and 10 kOe, the magnetostriction λ3k ≥ 500 ppm and λ15k ≥ 1000 ppm for temperature spans of 155 K and 280 K, respectively. This suggests that the Ho0.3Tb0.3Dy0.4Fe1.93 compounds have wide temperature domain magnetostrictive properties.展开更多
海管的管端终止设备(PIPELINE END TERMINATION,PLET)舷侧海上安装过程中由于现场管子晃动性较大,导致黄金焊口组对和焊接不能正常完成,本文根据海管的PLET海上安装黄金焊口的特点和要求,介绍了一套半瓦环抱式开对口器的设计和应用。该...海管的管端终止设备(PIPELINE END TERMINATION,PLET)舷侧海上安装过程中由于现场管子晃动性较大,导致黄金焊口组对和焊接不能正常完成,本文根据海管的PLET海上安装黄金焊口的特点和要求,介绍了一套半瓦环抱式开对口器的设计和应用。该套外对口器经过项目验证,适用于海管PLET舷侧海上安装黄金焊口的组对和焊接,相对于原来的外对口卡子效率提升4倍,稳定性较好,满足组对效率高、方便于焊接和操作方便等要求。展开更多
文摘本文采用真空电弧熔炼法制备了Ho0.3Tb0.3Dy0.4Fe1.93Laves相化合物,研究了其结构、磁性和磁致伸缩性能。X射线衍射实验和能谱分析结果表明,Ho0.3Tb0.3Dy0.4Fe1.93化合物呈现单一的Laves相。根据初始交流磁化率曲线确定Ho0.3Tb0.3Dy0.4Fe1.93化合物有两个自旋重取向温度TSR1和TSR2,分别对应易磁化方向从到和从到的转变。差示扫描量热法测量出Ho0.3Tb0.3Dy0.4Fe1.93化合物居里温度为643 K。在室温下,Ho0.3Tb0.3Dy0.4Fe1.93化合物在3 kOe和10 kOe磁场下,磁致伸缩(λ||-λ⊥)分别为810 ppm和1332 ppm。变温磁致伸缩研究表明,在3 kOe和10 kOe磁场下,磁致伸缩λ3k ≥ 500 ppm和λ10k ≥ 1000 ppm的温度跨度分别为155 K和280 K。这表明Ho0.3Tb0.3Dy0.4Fe1.9化合物具有宽温域磁致伸缩性能。In this paper, Ho0.3Tb0.3Dy0.4Fe1.93 Laves phase compounds were prepared by vacuum arc melting method, and their structural, magnetic, and magnetostrictive properties were investigated. The results of X-ray diffraction experiments and energy spectroscopic analyses showed that the Ho0.3Tb0.3Dy0.4Fe1.93 compounds exhibit a single Laves phase. The Ho0.3Tb0.3Dy0.4Fe1.93 compound was determined to have two spin reorientation temperatures, TSR1 and TSR2, based on the Initial AC magnetic susceptibility, which corresponds to transitions from to and from to in the easy magnetic directionin, respectively. Differential scanning calorimetry measured the Curie temperature of the Ho0.3Tb0.3Dy0.4Fe1.93 compound to be 643 K. At room temperature, the magnetostriction (λ||-λ⊥) of the Ho0.3Tb0.3Dy0.4Fe1.93 compounds is 810 ppm and 1332 ppm for magnetic fields of 3 kOe and 10 kOe, respectively. Variable-temperature magnetostriction studies have shown that, for magnetic fields of 3 kOe and 10 kOe, the magnetostriction λ3k ≥ 500 ppm and λ15k ≥ 1000 ppm for temperature spans of 155 K and 280 K, respectively. This suggests that the Ho0.3Tb0.3Dy0.4Fe1.93 compounds have wide temperature domain magnetostrictive properties.
文摘海管的管端终止设备(PIPELINE END TERMINATION,PLET)舷侧海上安装过程中由于现场管子晃动性较大,导致黄金焊口组对和焊接不能正常完成,本文根据海管的PLET海上安装黄金焊口的特点和要求,介绍了一套半瓦环抱式开对口器的设计和应用。该套外对口器经过项目验证,适用于海管PLET舷侧海上安装黄金焊口的组对和焊接,相对于原来的外对口卡子效率提升4倍,稳定性较好,满足组对效率高、方便于焊接和操作方便等要求。
