调节剂对烷基水杨醛肟萃取铜铁的影响

烷基水杨醛肟虽然是一种高选择性的铜萃取剂，但单独使用时，萃取相易出现沉淀；反萃时，再生有机相出现乳化物，而且两相分离时间较长．将月桂醇、仲辛醇、壬基酚三种调节剂分别加入到萃取剂中，研究其对烷基水杨醛肟萃取及反萃行为的影响．结果表明，三种调节剂均可以解决上述问题，只是使萃取能力略有降低；壬基酚加入到烷基水杨醛肟中有助于提高铜铁分离系数，可达647．     

锆(Ⅳ)-3,5-diBr-PADAP-安替比林三元配合物的分光光度研究与应用

本文提出在安替比林存在下,以3,5-diBr-PADAP为显色剂,分光光度测定微量锆的新方法。在pH1～2的HCl介质中,锆(W)与试剂和安替比林形成配合比为1:1:1的红色三元配合物,最大吸收值在615nm波长处,摩尔吸光系数ε=1.35×10~5。锆(Ⅳ)量在0～25μg/25ml范围内,遵守比尔定律。方法简单、快速、准确。若采用钽试剂—苯萃取法分离共存离子,可适用于钽铌矿和合金中痕量锆的测定。     

Microstructure and mechanical properties of AZ31 alloy ingot fabricated by semi-continuous casting

The AZ31 alloy ingot with diameter of 110 mm and length of 3500 mm was fabricated successfully. The compositions and microstructure morphologies of the ingot at different locations were performed, which indicated that the chemical composition distributed homogeneously through the whole alloy ingot and the average grain size increased from the surface to the center. The results of the EDS and element face-scanning illustrated that the eutectic compounds mainly consisted of fl-Mg17Al12 and a small amount of fl-Mgl7（AlZn）12. Furthermore, slight improvements of the strength and ductility were observed from the center to the surface along the axial direction of the alloy ingot, while both the strength and elongation to failure of the samples along the radial direction are higher than that along the axial direction. The fine grain strengthening was the main contributors to the strength of the as-casted AZ31 alloy.     

连铸结晶器表面强化层的研究现状和发展趋势

钢铁连铸结晶器作为连铸机的核心部件，其工作的可靠性、稳定性和耐用性便成为人们十分关心的问题。人们采用电镀、热喷涂等表面强化处理技术在结晶器表面制备一层保护层，以延长结晶器的使用寿命。阐述了结晶器表面强化技术的研究现状，并展望了结晶器的表面强化技术。     

Effect of Sm on hydrogen storage performance of La–Sm–Mg–Ni alloys

In this study, Sm was adopted in order to completely replace the expensive Pr/Nd elements in the A2B7 type alloy. The results indicate that Sm is a favourable element for forming Ce2Ni7 type and Ce5Co19 type phases. With the increasing amount of Sm, the discharge capacity of the alloy retains a value of 283·3 mAh g^?1 at the current density of 1200 mA g^?1. The maximum discharge capacity of the alloys increases with the increasing Sm content when Mg content is relatively low. By optimising the composition and processing technology, the cycle life the alloy enhances from 74 cycles to more than 540 cycles, and the maximum discharge capacity also increases from 300 to 355 mAh g^?1.     

丁二酮肟分离-EDTA络合返滴定法测定哈氏合金中的镍

哈氏合金样品用氢氟酸和硝酸加热溶解,用丁二酮肟沉淀镍,使其与铬、铁、钨等干扰元素分离,沉淀溶于盐酸,加入过量的EDTA标准溶液,以二甲酚橙为指示剂,在PH=5.5~6的HAC-NaAC缓冲介质中用标准Zn盐溶液返滴定.该方法具有良好的精密度,准确度高,能够满足哈氏合金样品中镍含量的测定要求.     

等离子体喷涂中颗粒加热过程数值模拟

目的研究颗粒在等离子体喷涂中的加热过程及影响因素。方法使用Fluent软件对处于等离子射流中颗粒的加热过程与状态进行求解计算,根据计算结果分析了喷距、颗粒直径与颗粒材料对颗粒加热状况与内部温度梯度的影响。结果对于不同的喷距,在颗粒升温过程中,颗粒表面温度高于中心温度;在颗粒降温过程中,颗粒表面温度低于中心温度,并且降温过程中的表面-中心温差远小于升温过程中的表面-中心温差。在颗粒升温过程中,其内部存在不同的加热阶段。对于不同的直径,虽然大颗粒比小颗粒能进入射流中心更深的位置,但小颗粒的加热效果更好。表面-中心温差随着颗粒直径的增大而增大,三种不同直径的颗粒的表面-中心温差变化曲线都表现出相似的趋势。对于不同材料的颗粒,热导率越低的颗粒,其表面-中心温差越高,越难以完全熔化。结论喷距、颗粒直径与颗粒材料对颗粒加热状况和内部温度梯度有很大的影响,该模拟结果能为分析颗粒与等离子体之间的传热提供参考。     

The application of plasma-sprayed ceramic coatings on lift roller in float glass

Oxide ceramic was sprayed via high-energy plasma spray using MCrAlY manufactured with special technique as bond coating and oxide ceramic as top coating in this article. Investigation showed that the dense and highly adhesive coating could be obtained with optimized technique. After grinding and polishing, coating roughness was lower than 0. 2μm, which could meet the requirements of lift roller. After one year serv ice, molten Tin could not adhere to the ceramic coating,well it greatly alleviated its corrosion to the roller , kept the surface of oxide ceramic coating smooth and the improve the quality of glass due to the strengthened lift roll.     

Experimental investigation and thermodynamic calculation of the phase equilibria in the Fe–Ni–V system

The phase equilibria in the Fe–Ni–V ternary system were investigated by means of electron probe microanalysis (EPMA) and X-ray diffraction (XRD). Three isothermal sections of the Fe–Ni–V ternary system at 1000 °C, 1100 °C and 1200 °C were established. On the basis of the obtained experimental data, the phase equilibria in the Fe–Ni–V system were thermodynamically assessed using (CALculation of PHAse Diagrams) CALPHAD method, and a consistent set of thermodynamic parameters leading to reasonable agreement between the calculated results and experimental data was obtained.