锂金属与室温熔盐相互作用的电化学和SEM研究

用电化学交流阻抗，循环伏安法和扫描电镜方法研究了锂和１－甲－３－乙咪唑氯化物／ＡｌｃＬ３室温熔卤体系的相互作用结果表明，锂与该室温熔盐体系发生快的化学反应，生成两种钝化膜。     

A high-performance thermoacoustic refrigerator operating in room-temperature range

The working principle of an efficient travelling- wave thermoacoustic refrigerator operating in room-temperature range has been analyzed and an experimental set-up has been built. The experiment showed that suppressing DC-flow streaming was very critical to efficient operation, and an elastic membrane was used to solve the problem successfully. At the most efficient operating point, the novel thermoacoustic refrigerator achieved a cooling capacity of about 80 W at -20℃, with a much higher efficiency than previously developed standing-wave thermoacoustic refrigerator.     

室温离子液体在原子光谱分析中的应用研究进展

介绍和讨论了室温离子液体的理化特性及其作为萃取剂在分离富集金属离子中的应用.综述了室温离子液体在火焰原子吸收、蒸汽发生原子吸收、石墨炉原子吸收、原子荧光光谱和原子发射光谱的应用研究进展.     

Solid-Liquid State Bonding of Si3N4 Ceramics with Ceramic-Modified Brazing Alloy

Solid-liquid state bonding of Si3N4 ceramics with TiN-modified Ag-Cu-Ti brazing alloy was used to enhance joint strength. The effects of the TiN particles on the microstructures, interfacial reactions, and room-temperature properties of the joints were investigated. The results show that the TiN particles are generally well dispersed in the Ag-Cu eutectic base and the interface between them is both clean and compact. Changes in the TiN volume fractions from 0 to 20% exert no noticeable effect on the interfacial reaction between Ag-Cu-Ti and the substrates. Other bonding parameters being constant, the TiN volume fraction in the filler material plays a key role in the joint properties. For TiN volume fractions below 20%, the joints are reinforced, especially joints with 5% and 20% TiN. The average shearing strength of joints with 5% TiN is 200.8 MPa, 30% higher than that of joints with no TiN (154.1 MPa). However, for TiN volumes fractions above 20%, the joint strengths decrease.     

室温常压下氮氢气体交流放电合成氨的研究

室温常压条件下,储存在高压钢瓶中的氮氢气体,以1:3的混合比,流量分别为40ml/min和12ml/min,混合气流经石英玻璃气套,石英玻璃气套安放在一对园柱面电极中间,两园柱面电极与交流电源相连接,电源的输出电压15KV,频率为20KHz。石英玻璃气套中氢氢气体被高电场强度的交流电场所激活,具有了化学活泼性。室温常压下的气体分子间发生频繁地碰撞,可引发化学反应。氢氢气体放电合成了氨NH_3。 对氮氢气体放电合成氨的转化率影响较大的有:a.放电频率,b.当放电频率固定为20KHz时,电源的输出电压值,c.氮氢气体混合比。     

非除氧室温磷光法对芴的测定研究

非除氧条件下,1,2-二溴乙烷能诱导芴在γ-环糊精水溶液中产生强的室温磷光,且芴的浓度在1.8×10-7～2.5×10-6 mol/L时,与体系的磷光强度呈良好线性关系,检出限为1.53×10-9 mol/L.     

Mo-Si-B三元系复合材料的制备及室温断裂韧性

通过Mo,Si,B三种单质粉末原位合成热压的方法制备了成分为Mo-12Si-8.5B和Mo-28Si-8.5B的Mo-Si-B三元系复合材料.利用金相显微镜、金相偏光镜、X射线衍射技术、扫描电镜等对制备材料的组织进行了分析,研究了退火工艺对其组织的影响,测量了其室温断裂韧性,并对复合材料的增韧机制进行了初步的探讨.     

置氢Ti-6Al-4V合金组织与室温变形行为的相关性

应用压缩实验研究置氢Ti-6Al-4V合金的室温力学行为,采用OM、SEM分析了氢对钛合金组织的影响和断口形貌特征,探讨了置氢钛合金组织和室温变形行为之间的相关性.结果表明:氢的固溶强化作用使置氢Ti-6Al-4V合金硬化效应增加,但适量的氢可以显著降低其压缩屈服强度和弹性模量,且断裂时发生的变形量增加,此时合金组织为á a的双态组织,当合金中产生粗大的a晶粒时,断裂时发生的变形量显著降低;氢的加入促进了合金中斜方马氏体á″的生成;置氢Ti-6Al-4V合金的室温压缩断口为延性沿晶断裂或脆性沿晶断裂和解理型穿晶断裂两种断裂方式的混合断口.     

Research on defects and domain characteristics of MgO-doped near-stoichiometric lithium tantalate in room-temperature polarization process

MgO-doped congruent and near-stoichiometric lithium tantalate single crystals were grown by Czochralski technique and flux method respectively. Optical absorption studies showed that the UV absorption edge was very sensitive to the composition of the crystals and the decrease in defects led to the blue-shift of the UV-edge. The unit domain shape also related to the composition, and the observed results of the crystal wafers that etched by hydrofluoric acid indicate that the domain structure of near- stoichi...     

多晶铂电极在离子液体中的界面微分电容研究

常温下用循环伏安法和电化学阻抗法研究了多晶铂电极在两种室温离子液体[BMIM]BF4,[EMIM]BF4(BMIM:1-butyl-3-methylimidazolium;EMIM:1-ethyl-3-methylimida-zolium)中的界面微分电容曲线.阻抗测量频率区间为10Hz到10kHz,得到的电容电势曲线既非抛物线形又非钟形.改变电势扫描方向测得的电容电势曲线形状不同,负向扫描曲线相对于正向扫描曲线会有延迟效应.这种延迟效应与离子在Pt电极上的吸附能和Madelung位能相关.