Huogen HUANG
金属学报(英文版)
Ti/Zr-based icosahedral quasicrystals are a kind of promising hydrogen storage materials, however their absorption regeneration after oxidation-poisoning has been scarcely studied. This work is intended to investigate the deuterium-storage regeneration of a suction-cast Ti36Zr40Ni20Pd4 quasicrystal. It was found that only through hot vacuuming the quasicrystal could be refreshed from air-flow poisoning to absorb deuterium in two cycles. During the first absorption course, a pregnancy period was observed before the real deuterium uptake while deuterium was loaded rapidly during the second one. The deuterium concentration in the alloy can reach 0.011 mol?D2/(g?M) (corresponding to a hydrogen mass percent of 2.2%. D2 and M denote molecular deuterium and the metallic alloy). But the loaded deuterium was very difficult to release completely even by eight-stage desorption at different temperatures. After the second desorption, the quasicrystal phase remained in a small volume, as though the desorption temperature was beyond the crystallization temperature of the quasicrystal. This probably is attributed to the solution function of residual deuterium in the alloy.
关键词:
Regenerate deuterium absorption
,
氘
,
Ti-Zr-Ni-Pd合金
,
再生.
黄火根陈亮李嵘罗德礼
金属学报
doi:DOI: 10.3724/SP.J.1037.2009.00821
在Ti40Zr40Ni20准晶合金中掺Pd制备了Ti36Zr40Ni20Pd4准晶合金, 利用X射线衍射(XRD)、金相(OM)、光电子能谱(XPS)、气固反应等对其组织结构和吸氘特性进行了研究. 结果表明, 在吸铸态下该合金形成了二十面体准晶相, 准晶格常数为0.5174 nm. 其热力学稳定性较差, 约400 ℃时转变为tI-Zr2Ni与C14-TiZrNiPd晶体相. 室温下, 其吸氘能力为11.0 mmol/g(相当于 2.2%的吸氢质量分数), 吸氘速率达到0.030 s-1, 准晶结构不变但准晶格膨胀5.5%. 添加的Pd起到催化作用, 与初始合金相比, Ti36Zr40Ni20Pd4准晶合金的活化与储氘能力明显提高.
关键词:
Ti-Zr-Ni-Pd合金
,
quasicrystal
,
deuterium
,
catalyzing
黄火根
,
刘天伟
,
陈亮
,
张志
稀有金属材料与工程
针对Ti36Zr40Ni20Pd4合金用X射线衍射仪和气固反应系统研究了其吸铸之前的晶体结构与吸氘特性.结果表明,吸铸前Ti36Zr40Ni20Pd4合金母锭形成了配位数为14的MgZn2结构的简单六方C14 Laves相,晶格常数a=0.5287 nm与c=0.8610 nm.简单活化后,该合金可在室温下大量吸氘,浓度达到10.96 mmol·D2/g·M(D2指氘分子,M指合金).经过一次吸放氘循环后,吸氘动力学显著提高,吸氘速率常数达到0.015 s-1.相对于成分相同的准晶相,Laves相Ti36Zr40Ni20Pd4合金吸氘较慢,但吸氘量相近,具有一定的储氢前景.
关键词:
储氢合金
,
Laves相
,
Ti-Zr-Ni-Pd合金
,
氢同位素
黄火根
,
陈亮
,
李嵘
,
罗德礼
金属学报
doi:10.3724/SP.J.1037.2009.00821
在Ti40Zr40Ni20准晶合金中掺Pd制备了Ti36zr40Ni20Pd4准晶合金,利用X射线衍射(XRD)、金相(OM)、光电子能谱(XPS)、气固反应等对其组织结构和吸氘特性进行了研究.结果表明,在吸铸态下该合金形成了二十面体准晶相,准晶格常数为0.5174 nm.其热力学稳定性较差,约400℃时转变为tI-Zr2Ni与C14-TiZrNiPd晶体相.室温下,其吸氘能力为11.0 mmol/g(相当于2.2%的吸氢质量分数),吸氘速率达到0.030 s-1,准晶结构不变但准晶格膨胀5.5%.添加的Pd起到催化作用,与初始合金相比,Ti36Zr40Ni20Pd4准晶合金的活化与储氘能力明显提高.
关键词:
Ti-Zr-Ni-Pd合金
,
准晶
,
氘
,
催化
