The growth of γ-LiAlO2 layer with a highly-preferred orientation on (0001) sapphire

Using vapor transport equilibration (VTE) technique we succeeded in the fabrication of single-phase γ-LiAlO2 layer on (0001) sapphire substrate. X-ray diffraction indicated that the as-fabricated layer was highly textured with [100] orientation at proper VTE treatment temperature range from 1050℃ to 1100℃. The main factors affecting the quality of the γ-LiAlO2 layer were investigated by SEM and transmission spectra. These results reveal the possibility of fabricating γ-LiAlO2 (100)// sapphire (0001) composite substrate for GaN-based epitaxial film by VTE.     

Nonlinear seismic response analysis of reinforced concrete tube in tube structure

Super-highly reinforced concrete tube in tube structure is a developing structure system of high-rise building. The more reasonable derivation process of the multi-vertical-line-element model stiffness matrix is given.On the premise of pointing out the problems of present multi-spring element model, combined with present multivertical-line-element model for analyzing on shear wall, the model is expanded to spatial one, and the stiffness matrix of which is derived. Combined with hysteretic axial model and hysteretic shear model, it is suitable for columns,wall limbs and beams with all kinds of section form. Some examples are calculated and compared with test results,which shows that the models have relatively good accuracy. On the base of the experimental phenomenon and failure mechanism for tube in tube structure specimen, nonlinear seismic responses analysis program on the basis of the advantaged element model for tube in tube structure is developed. Calculation results are in good agreement with those of the pseudo-dynamic tests and the failure mechanism can be well reflected.     

Al-Ti纤维增强Mg合金复合材料的制备及其微观组织

本文采用粉末冶金工艺制备出了一种新的Al-Ti纤维增强Mg合金复合材料,经光学显微镜、扫描电子显微镜和X射线衍射分析,表明Al-Ti纤维在Mg合金基体中分布均匀,制备过程中没有被损伤.纤维/基体界面上有不连续的颗粒状Mg17Al12析出,此析出相直径小于1.5μm,且数量很少.     

原位复合钛酸铅/镍(铅)铁氧体复相粉体的制备研究

利用sol-gel法并通过原位复合方法制备了具有铁电性能的PbTiO3和具有铁磁性能的NiFe2O4和PbF12O19多相复合体系陶瓷粉体。利用XRD、SEM对多相复合体系的物相结构和形貌等进行研究。结果表明，在700℃以上则形成铁电（PbTiO3）/（NiFe2O4和PbF12O19）三相复合体系。热处理温度对多相复合体系晶相的形成和生长产生关键性作用，多相复合共存体系中形成的晶相多以固溶体存在，各固溶晶相的晶格常数随固溶量的不同而不同。     

Effect of Relative Reduction on Property of Steel-Mushy Cu-Graphite Composite

The rolling treatment of steel-mushy QTi3.5-3.5 graphite composite was conducted under different relative reduction at room temperature. The effect of room-temperature rolling on interfacial mechanical property of steel-mushy QTi3.5-3.5 graphite composite was studied and the relationship between interfacial shear strength and relative reduction was established. The results show that, for steel-mushy QTi3.5-3.5 graphite composite, which consists of 1.2 mm-thick 08AI steel plate and 2.8 mm-thick QTi3.5-3.5 graphite layer, there is a nonlinear relationship between interfacial shear strength and relative reduction in graphite layer. When relative reduction is smaller than 1.1%, interfacial shear strength increases with increasing the relative reduction. When relative reduction is larger than 1.1%, interfacial shear strength decreases with increasing the relative reduction. When relative reduction is 1.1%, the largest interfacial shear strength of 145.2 MPa can be obtained.     

质子交换膜燃料电池双极板的研究

双极板是质子交换膜燃料电池(PEMFC)的关键部件之一,直接影响到电池组的性能和成本。如何选用新材料及其工艺制备技术,大幅降低材料加工成本,是目前急需解决的关键问题之一,为此介绍了一种新型的低成本制备高性能双极板的方法。     

绝热毛细管流量数值计算

根据两相流动的均相流假设 ,建立了绝热毛细管分布参数的稳态数学模型 ,结合制冷工质HFC 134a基于MH状态方程的热力学性质计算模型 ,采用新的基团贡献法计算粘度 ,用熵增判据考虑壅塞流动的影响 ,对绝热毛细管流量进行数值模拟计算。对理论计算结果与相关文献的实验数据进行了比较。针对以HFC 134a为工质的制冷系统 ,编制了一套较为实用的绝热毛细管流量计算软件     

彩管用荫罩框架钢带WYK-1的研制

介绍了彩管用荫罩框架钢带从市场调研、实验室试验到工业性生产试验过程;详述了高纯净超低碳低铝钢的成份设计、热轧和冷轧工艺技术;简介了用户的应用效果.     

防治管式降膜蒸发器结垢的生产实践

针对用于烧结法碳分母液蒸发的管式降膜蒸发器加热管结垢形成的原因,采取了相应的改进措施。改进后蒸发器的蒸发效率显著提高,蒸汽消耗明显降低。