Results 41 to 50 of about 10,828 (166)
Rare Metals, Volume 45, Issue 4, April 2026.ABSTRACT The pre‐existing α‐Fe crystals have important effects on the precipitation and growth of nanocrystals and finally determine the comprehensive soft magnetic properties (SMPs) of the nanocrystalline alloys (NAs). In this work, a high content of Cu elements has been added to Nanomet‐type alloys to enhance the gradient heterogeneity in order to ...
Lei Xie +6 more
wiley +1 more source
Synthesis and Electrocatalytic Activity of Ruthenium Cobalt Alloys toward Oxygen Reduction Reaction [PDF]
, 2015 质子交换膜燃料电池具有工作温度低、启动快、比功率高等优点，被认为是电动汽车等的首选能源。现有的燃料电池技术需要使用价格昂贵的铂基催化剂，且阴极氧还原反应的过电位较大，严重阻碍了其商业化进程。因此，有必要研究同时具有高氧还原活性和良好稳定性的非铂阴极催化剂。钌基催化剂具有良好的氧还原活性，但钌硒化合物催化剂的稳定性较差，钌用量大，而钌基合金催化剂中钌的用量可调整，但存在氧还原活性较差，合成所用的金属先驱体较昂贵，甚至有毒，难于得到纯相等问题。本论文采用较廉价的金属氯化物为原料 ...
高东
core
Rare Metals, Volume 45, Issue 4, April 2026.ABSTRACT Zirconium dioxide (ZrO2) thin films are critical materials owing to their thermal stability, mechanical durability, and optical transparency enabling applications in photonic, sensing, and electronic devices. However, achieving uniform deposition via plasma‐enhanced chemical vapor deposition (PE‐CVD) has remained challenging due to poor ...
Nour Manafikhi +4 more
wiley +1 more source
Dianci bileiqi, 2005 采取提高热处理温度、延长保温时间等措施,改善直径大且厚的电阻片老化性能,取得了较好的效果。试验证明,热处理工艺可使电阻片的压比明显降低;在0.75U1mA下的阻性电流除少数外均有不同程度的增大,总的规律是尺寸大的比小的增大得多;热处理可明显提高电阻片的方波通流能力,并改善其稳定性。欲通过热处理使电阻片的性能获得最佳,必须根据电阻片的尺寸、烧成制度等调试热处理炉的温度制度及装片密度,选定较合理的工艺。采用再次热处理的方法使已抽查试验的电阻片性能得到恢复。通过X衍射试验 ...
王振林, 高奇峰, 姜玉根
doaj
Effects of CeO2 on Bi2O3-rich Lead-free Sealing Glass Ceramics [PDF]
, 2012 传统上，国内外电子与电器设备上的电热管常用的封接材料是含Pb微晶玻璃；但是，由于含Pb玻璃有毒，美日欧及我国等先后采取了相关措施，对封接材料的含Pb量作了严格法律的限制。因此，研制无Pb封接微晶玻璃具有十分重要的意义。本研究作为制备结构材料，对于Bi2O3原料的纯度要求不高，可提取自某些稀土尾矿，CeO2如能应用于封接用无Pb封接微晶玻璃，则对尾矿处理、稀土综合利用和轻稀土大量堆积等问题的解决有积极的作用，且加入少量CeO2可以有效提高封接玻璃与添加铈的合金的结合能力。 本研究在全面深入的调研的基础上 ...
范尚青
core
Rare Metals, Volume 45, Issue 4, April 2026.ABSTRACT Additively manufactured AlCoFeNi series eutectic high‐entropy alloys (EHEAs) exhibit nonequilibrium dual‐phase microstructure in the as‐printed state, allowing them to be easily tailored through annealing to explore their strength–toughness potential.
Huidong Wu +13 more
wiley +1 more source
Macro-dimension effects and phase transformation ofNi-Mn based high temperature shape memory alloys [PDF]
, 2016 Ni-Mn基形状记忆合金是发现比较早的一种高温形状记忆合金，其具有从高温母相（B2）转变为低温四方马氏体的可逆马氏体转变过程。但是Ni-Mn基合金的多晶脆性极大且其形状记忆效应差，因此关于该体系的研究较少。本论文拟通过添加有利于γ相形成的元素（Cu、Co和Fe），促使合金在均质化处理后呈现塑性的fccγ相组织，其后再研究合金在加热和冷却过程中的相转变行为、微观组织结构和尺寸效应，以及在预变形下的高温形状记忆效应。 本文首先以Ni50Mn50为母合金，根据Cu、Co ...
刘玉鼎
core
Direct Observation of Matrix‐to‐Precipitate Elemental Diffusion in Severe Plastic Deformation
Rare Metals, Volume 45, Issue 4, April 2026.ABSTRACT Elemental redistribution, particularly the solute exchange between the matrix and precipitates, is a central issue in alloys subjected to severe plastic deformation (SPD). To elucidate this behavior, a nickel–aluminum bronze (NAB) alloy was processed by high‐pressure torsion (HPT), and its microstructural evolution was systematically ...
Xiaobin Yang +9 more
wiley +1 more source
Preparation and Modification of One-dimensional TiO2 Nanomaterial and Its Properties in Dye Sensitized Solar Cell [PDF]
, 2015 随着人类文明的进步，对环境和能源的要求越来越高，清洁可再生能源一直以来都是人类追求的梦想。半个世纪以前，太阳能的开发利用使得人类离梦想又近了一步，光伏太阳能电池从最初昂贵的空间应用发展到了现在可接受的商业化民用，不过人们一直还在寻求开发制备更为经济实用的新型太阳能电池。其中染料敏化太阳能电池是近年来发展最为迅速的一类新型太阳能电池，与传统的光伏电池相比，有着不同的工作原理，它的电子空穴产生、分离及转移分别发生在两相之间，因此可用纯度相对较低的材料制备组装电池器件，从而大大降低整体器件的成本 ...
郑大江
core
Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT Low conductivity, slow ion‐diffusion, and limited reactive sites are common problems in electrocatalysts and electrode materials. In this study, a complex NiTe–CoTe heterojunction with abundant Te vacancies embedded in N, P, and F co‐doped hollow carbon nanorods (NiTe1−x–CoTe1−x/NPFC) was fabricated via a simple ionic liquid‐assisted ...
Mingjie Yi +7 more
wiley +1 more source