J. Zhang
,
J.B. Li
,
Q.Heng and X.H.Zhang Shenyang University
,
Shenyang 110044
,
China L.Q.Qi LiMing Aeroengine Manufacfruing Corperation
,
Shenyang 110043
,
China
金属学报(英文版)
NCoCrAlSiYHf and CoNiCrAlTaY coatings which belong to protective Al 2O 3 scale forming type were deposited by multi arc ion plating technique . The effect of deposition process parameters on qualities of the coatings was discussed. The high temperature oxidation performances isothermal oxidation with 950℃ / 500h and 1100℃ / 100h were studied. And also, the hot corrosion performances at 700℃ and 800℃, with molten mixed salt composed of 75%wt Na 2SO 4 and 25%wt NaCl were investigated. Then the high temperature protection decaying mechanisms were proposed.
关键词:
multi arc ion plating
,
null
,
null
,
null
Zhijian LIU
,
Zhiyou LI
,
Wei DUAN
,
Xuanhui QU
,
Baiyun HUANG
,
Siqi ZHANG
材料科学技术（英文）
A LI-B alloy has been prepared using a pretreated amorphous B powder and pure Li ingot as starting materials by continually slow addition of B powder and intensified stirring in the process of melting. The microstructure and the discharge characteristic of the materials have been investigated. Results show that the problem of temperature control in synthesis would be modified by means of continual addition of B powder, the Li7B6 would be more finery distributed in the metal Li by means of intensified stirring. The discharge characteristic of the Li-B alloy using amorphous B as starting materials is almost the same with that of using crystalline B.
关键词:
梁浩
,
赵明久
,
陈胜虎
,
徐勇
,
王永利
,
戎利建
金属学报
doi:10.11900/0412.1961.2015.00255
采用OM,SEM,TEM,EPMA和二次离子质谱(SIMS)等手段,研究了B对J75抗氢合金晶界η相析出的抑制作用机制,采用饱和热充氢、三维原子探针(3DAP)技术和氢渗透实验方法,研究了B对合金抗氢性能的影响机制.结果表明,不含B合金中存在Ti的晶界偏聚,导致晶界7相在时效过程中析出;含B合金中,由于B抑制了Ti的晶界偏聚,使玎相难以形核长大,从而抑制了晶界η相的析出.B和H原子存在位置竞争关系,B降低合金的氢扩散系数,阻碍H原子的扩散和迁移,减少晶界偏聚H原子数量,抑制氢致裂纹形成.
关键词:
J75合金
,
B
,
抗氢性能
,
η相
许小静
,
段柏华
,
曲选辉
,
罗远辉
稀有金属材料与工程
通过对合成装置的温控、散热、搅拌桨叶片等进行有效改进,获得了300 g/炉的制备规模,制备出的合金性能均匀一致,其密度及抗拉强度分别为0.870 g/cm3,12.61 Mpa.同时,根据反应合成现象及XRD结果,分析了Li-B合金的反应机制及其动力学过程.
关键词:
热电池
,
Li-B合金
,
阳极材料
,
制备
,
反应机制
刘志坚
,
段伟
,
黄英华
,
李志友
,
曲选辉
功能材料
使用扫描电子显微境对放电前后的Li-B合金的微观特征进行了观察,对影响Li-B合金放电稳定性的主要因素进行了分析.结果表明,轧制后的Li-B合金为塑性好的Li包裹脆性的LiB粒子,在520℃放电后Li-B合金与电解质界面依然完整,在大电流(200mA/cm)短时间(12min)放充电后,金属锂被LiB和电解质分割,表现在断口上金属锂为细丝状.
关键词:
热电池
,
Li-B合金
,
阳极
刘志坚
,
曲选辉
,
李志友
,
黄伯云
中国有色金属学报
根据LiB化合物的六方结构模型， 计算了热 电池阳极材料Li-B合金随B含量变化的理 论密度曲线。 采用阿基米德方法分别测量了含24%(摩尔分数)B的Li-B合金反应完全并经冷 挤压后的样品和 未经第二次放热反应中间样品的密度， 综合分析了以往不同研究者所测量的结果。 结果表 明 ， 反应充分并消除合金中孔隙后合金的实验密度值与理论计算值一致， 以往造成实验偏差 的主要原 因是样品中存在孔隙。 中间样品的密度与Li-B元素混合计算密度一致， 它支持在第一次 反应和第二次反应之间B熔化在Li中的观点。
关键词:
Li-B合金
,
阳极
,
热电池
,
密度
杨兵初
,
唐成颖
,
刘志坚
材料导报
介绍了Li-B合金作为最新一代热电池阳极材料所具有的优良性能.重点综述了它在材料的物理化学性能、结构与组成及材料合成机制与制备等方面的研究现状及最新进展.同时介绍了国内Li-B合金阳极的研究现状.
关键词:
热电池
,
Li-B合金
,
阳极材料
许小静
,
曲选辉
,
罗远辉
稀有金属材料与工程
Li-B合金是一种性能优良的热电池用阳极材料,由于合成制备困难制约了它的应用.通过对合成过程中气氛、搅拌、温度控制、后处理等工艺进行有效改进,获得了300g/炉的制备规模,得出了本实验条件下制备Li-B合金的最佳工艺,所制备的合金均匀致密,放电性能达到国内先进水平.
关键词:
热电池
,
Li-B合金
,
阳极材料
,
制备工艺
Energy & Environmental Science
The Li-Mg-B-H system that is prepared from 2LiH + MgB(2) or 2LiBH(4) + MgH(2) possesses high hydrogen capacity and relatively favorable thermodynamics, but it is greatly restricted in practical hydrogen storage applications by problematic H-exchange kinetics. In the present study, TiF(3) was mechanically milled with a 2LiH + MgB(2) mixture and examined with respect to its effect on reversible dehydrogenation of the Li-Mg-B-H system. Experimental study showed that TiF(3) is highly effective for promoting the two-step dehydrogenation reaction in the Li-Mg-B-H system. Compared to the neat 2LiH + MgB(2) sample, the 2LiH + MgB(2) + 0.01TiF(3) sample exhibits significantly reduced dehydrogenation temperature and markedly enhanced dehydriding rate at both steps. Furthermore, the catalytic enhancement arising upon adding TiF(3) additive was observed to persist well in the hydrogenation/dehydrogenation cycles. Based on the results of phase analysis and a series of designed experiments, the mechanism underlying the observed property improvement is discussed.
关键词:
complex hydrides;libh4;tif3;kinetics;naalh4
