Abstract:The characteristics of Ni-H cell and the compositions, preparation and processing technique of rare earth hydrogen storage materials applied to Ni-H cell are introduced in this paper. The effect of the additives on the comprehensive properties of the LaNi_5 based alloy electrode and the future application and development of Ni-H cell are also described.

Abstract:The present development of the determination of gases in metals have been reviewed. The applications of reduced fusion, particularly inert-gas fusion methods, the research of determination methods of gases in hyperpure metals, the influence of sample treatment on determination results, etc., are covered and discussed in brief. The standard methods, standard samples and commercial gas-analyzing equipment are also involved.

Abstract:用透射电子显微术和X射线能谱术研究了Ti_3Al-11Nb(Ti-12.5wt%Al-21wt%Nb)合金热锻棒材在热处理过程中的相变特征。结果表明,合金在1100℃加热后缓冷到室温的样品其组织由α_2+β相组成。与α_2相相比,β相明显地表现出Al含量低而Nb含量高。1200℃油淬样品的组织由α_2+B2相组成,二相含量大致相近。1200℃水淬样品由单一的B2相组成。水淬并经750℃时效的样品中析出两种形态的α_2相:首先由晶界析出的较粗的α_2相以及在晶内普遍析出的弥散的α_2相。

Abstract:报导了用熔融定向凝固工艺制备的有织构YBCO超导体的微结构变化及其特性。将YBCO坯料加热到1050—1120℃,分解成Y_2BaCuO_5(211)和液相(Ba-Cu-O),然后在50℃/cm的温度梯度下,慢速移动样品重新合成YBCO超导体。X光衍射结果证实,熔融样品具有较强的c轴织构。扫描电镜观察表明,熔融后晶粒形貌发生了显著变化:YBCO晶粒由原烧结块材的随机排列变为一致取向或局部取向排列的片状组织。熔融样品的J_c(77K,0T,>10000 A/cm~2)值比烧结块材J_c(750A/cm~2)

Abstract:用透射电子显微镜观察了TC6钛合金在高温退火过程中形成的亚晶(Subgrain)。合金经850℃,920℃退火后炉冷和空冷,在初生α相晶粒内形成亚晶,多为成簇分布的狭长形状,亚晶的数量随退火后冷却速度的增加而减少。亚晶界(Subgrain boundary)是由位错构成的,亚晶的形成是多边化(polygonization)的结果。

Abstract:The process to manufacture composite material Ag-Cu-C with multimillion-fibrous structure has been investigated by indirect reapated extrusion-drawing method. The results show that, with increasing the number of extrusion, the extrusion coefficient and specific resistance increase, but ultimate tensile strength and elongation at room temperature decrease. A composite wire, which consists of 1067857 homogeneous distributed fibres of Ag, Cu and C, arranged at intervals has been prepared.

Abstract:介绍了耐蚀Ti-0.3Mo-0.8Ni合金实验室试验及工业性试验研究的结果,报导了该合金的物理、机械和腐蚀性能。

Abstract:建立了一套脉冲临界电流测量装置,脉冲电流大小在0—500 A之间可调,脉冲电流上升时间在0.2—10 ms之间可调,失超电压判据可以达到微伏量级。对于电接点发热不明显的样品,用直流法和脉冲法测定的临界电流可以获得相同的结果。用本装置,在YBCO块样品上测到了高的临界电流密度数据:77K,1T下J_c>7×10~4A/cm~2,4T下J_c>3.5×10~4A/cm~2。

Abstract:A recoverable method for permeability of the titanium filter blocked by carbon particles is investigated. Two groups of the samples with the average blockage degree of 55% and 95%, respectively, are cleaned by supersonics or immersed in K_2Cr_2O_7 lotion. The recoverable permeability of these filter are determined later. The test demonstrates that the blockage degree, treating process, lotion formulation and the treating time all have impacts on the recoverability of permeability of titanium filter. It is shown that the treatment by supersonics has the best result, and the less the blockage by carbon particles, the easier for the recovery of the permeability of titanium filter.

Abstract:This article reviews the properties of 1, 10-phenanthroline (phen) and its metal chelates, and describes the practical applications of phen in the analytical chemistry.

Abstract:This review deals with the present applications of multicomponent complex in spectrophotometric analysis of Zr and Hf. The work for enhancing the sensitivity and improving selectivity of the process are cited.

Abstract:Some major refractory metal (W and Mo ) manufacturers, main products, processing techniques and facilities in former USSR are introduced. A preliminary evaluation is also given in this paper.