碳纳米管负载氧化钡催化剂的制备及性能

用自行制备的碳纳米管(CNTs)作为载体，研制出一种高活性的催化剂BaO／CNTs，通过对其表面物理结构的分析、SEM图对比以及催化活性的测定，证明小粒径的BaO粒子均匀地分布在碳纳米管表面，对己二酸脱羧反应有良好的催化活性。     

BaCO3—BaCl2熔剂对锰铁熔体氧化脱磷的实验研究

在１６２３Ｋ下使用各种组成的ＢａＣＯ３－ＢａＣｌ２熔剂对高碳锰铁熔体进行了脱磷实验，研究了（％ＢａＯ）浓度，ＢａＣｌ２配比对脱磷的影响以及熔剂中配入适量的ＭｎＯ２的作用，实验结果表明，当熔剂量为１０ｇ／１００ｇ合金时，可获得５０％～５５％的脱磷率，并有较好的保锰作用。     

Structure and Dielectric Properties of ZnO and Nb2O5 Doped BaO-TiO2 System Microwave Ceramics

The microwave dielectric properties and microstructure of BaTi4.3ZnyO9.6 y 0.02 mol% SnO2 0.01 mol% MnCO3 x mol% Nb2O5(x=0-0.05, y=0-0.08) system ceramics were studied as a function of the amount of ZnO and Nb2O5 doped. Addition of (y=0-0.05) ZnO and (x=0-0.025) Nb2O5 enhanced the reactivity and decreased the sintering temperature effectively. It also increased the dielectric constant εr and quality factor Q(=1/tan δ) of the system due to the substitution of Ti4 ions with incorporating Zn2 and Nb5 ions, which was analyzed by the reaction ZnO Nb2O5 3 TiTiX→ZnTi 2NbTi 3TiO2. When the system doped with (y=0.05) ZnO and (x=0.025) Nb2O5 were sintered at 1 160 ℃ for 6 h, the εr, Qfo value and τf were 36.5, 42 000 GHz, and 1.8 ppm/℃, respectively, at 5 GHz.     

High Water Content Material Based on Ba-Bearing Sulphoaluminate Cement

1IntroductionThe high water content material is a newtype of ce-menting material with extensive application.It has excel-lent properties that single paste solidifies slowly,doublepastes solidify fast and suspension property at highW/Cratiois good,which be…     

SiO2-BaO体系玻璃与金属的封接工艺

采用高温固相法制备出SiO2-BaO体系的特种玻璃,并与碳钢、合金等金属封接,制备了SiO2-BaO体系的特种玻璃封接元件.研究了封接温度和时间、封接气氛和退火等工艺参数对封接样品抗压强度、导电性能、密封性和热学稳定性的影响.通过扫描电子显微镜和能谱仪对封接界面处的形貌和元素进行了分析.结果表明:制备的封接器件具有优良的力学性能、密封性、热稳定性及电性能.最佳的封接工艺参数为:封接温度为975～985℃、封接时间为20 min、封接气氛为N2;其退火温度为490～530℃,退火时间为20 min.玻璃和金属封接处致密,无裂缝和气泡缺陷.封接界面处化学组成成分中最多的元素是C、Si、Ba和Mn.