含铌镍基合金中锆元素的测定

通过实验，弄清了铌的干扰状态，采用严格控制操作条件的办法，最大限度减少铌的干扰，直接快速测定含铌镍基合金中锆元素含量，取得较好的效果。     

单向压力对Ni—Mn—Ga磁形状记忆合金马氏体相变的影响

采用电阻和应变测量的方法，研究了单向压力对Heusler合金Ni56.3 Mn19.3 Ga22.8 C1.6马氏体相变的影响．结果表明：在压力小于4．44MPa时相变温度随压力值的升高而降低，dT/dσ=0．648K／MPa，说明了一定的压力阻碍马氏体相变的发生，当压力大于点升高，其原因可能是压力超过了临界值而引发了另一种相变．实验结果符合Clausius—Claperon方程．     

球墨铸铁QT500-7电弧冷焊工艺研究

利用火焰喷焊和手工涂敷两种方法在球墨铸铁表面预置镍基合金过渡层,后采用镍铁焊条大电流连续焊接.分析了镍基合金过渡层与母材的结合情况和焊接接头的金相组织及硬度分布,结果表明:过渡层与母材结合良好,喷焊过渡层的焊接接头热影响区基本无白口及淬硬组织,接头宏观硬度低于HB210,可满足机加工要求,喷敷镍基合金过渡层是一种可行的焊补铸铁的方法.     

电动汽车的新动力

技术专家们正在绞尽脑汁用各种各样方法让电池更新换代,一场电子设备的革命正悄悄来临。在不远的将来,也许我们手中的可乐就可以帮汽车行驶几百公里。如果你对电池的感觉还停留在手电筒里圆柱形干电池的印象中,那实在是太落伍了。从最早我们熟知的铅酸电池到后来的镍镉电池、镍氢电池,再到如今手机里清一色的锂电池,以及研发与实用并重的太阳能电池、燃料电池,为了满足人们的需要和解决当前的实际困难,各类电池正在发展中形成各自的特色,最大程度地展现了科技、实用等优点。     

Ni-Mn合金的去合金化

在氩气保护下,应用真空熔炼炉分别制备了Ni30Mn70与Ni55Mn45合金.测定了这两种合金在(NH4)2SO4溶液中的圾化曲线,然后对其进行去合金化实验.结果显示,Ni30Mn70合金在1M(NH4)2S04溶液中去合金化后,试样表面呈现“泥裂”结构.Ni55Mn45在1M(NH4)2S04溶液中不同电位下去合金化...     

Fabrication and Interfacial Structure of Ni-YSZ-LSM Porous Scaffold for Solid Oxide Fuel Cells

A novel process route using tape casting and stacking for fabricating porous scaffold of solid oxide fuel cells (SOFC) was demonstrated. The linear shrinkages of anode (Ni-YSZ, YSZ stands for 3% Y_2O_3(mole fraction) stabilized ZrO_2) and cathode (LSM-YSZ, LSM stands for La_(0.8)Sr_(0.2)Mn0_3) were optimized to be uniform with that of electrolyte during sintering, by controlling the content of pore former. The micromorphology and interface microstructure of the cross-section of the porous scaffold were observed by optical microscope and scanning electron microscope, respectively. The element distribution and phase composition were analyzed by energy dispersive spectrometer and X-ray diffraction, respectively. The results showed that the porous scaffold with regular pore shape and high specific surface area was obtained after sintering at 1 350℃. The fabricated porous scaffold had defect free interfacial structures due to the uniform shrinkage of anode, cathode and electrolyte layers. In addition, it was shown that diffusions of Zr, Ni and La caused a progressive boundary between YSZ, Ni-YSZ and LSM-YSZ layers. The interface between anode and electrolyte (Ni-YSZ/YSZ) was mainly composed of Ni, YSZ and a small amount of NiO, and the interface between cathode and electrolyte (LSM-YSZ/YSZ) was mainly composed of YSZ, LSM and a small amount of La_2Zr_2O_7.     

稀有金属管件的国内外标准

笔者通过网络调研了稀有金属钛,镍,锆管件的国内外标准,文章介绍了这些标准的现状及我国钛管件新标准HG／T 3651。还介绍了稀有金属管件标准与钢管件标准之间的关系,以及各国标准之间的主要差异,这些对稀有金属管件的设计,生产,营销,安装有实用价值。