Fabrication of planar-type SOFC single cells by a novel vacuum dip-coating method and co-firing/infiltration techniques

A novel vacuum dip-coating method has been adopted to form a dense thin yttrium stabilized zirconia (YSZ) layer on the pre-fired Ni/YSZ anode substrate. Scandia-stabilized Zirconia (ScSZ) was screen-printed onto the YSZ layer as the cathode backbone material and co-fired in a single step. Sm_0.5Sr_0.5CoO_3−δ (SSC) nanoparticles were infiltrated into the ScSZ porous layer with a loading of 29.17wt% to gain the composite cathode. Without any optimization, the cell reached a maximum power density of 0.85 W cm⁻² with an area-specific resistance of 0.914 Ω cm² at 750 °C.     

溶胶-凝胶提拉法制备ITO透明导电膜

采用溶胶-凝胶(sol-gel)法,利用自制的提拉实验设备于石英玻璃片上制得了ITO(indium tin oxide)透明导电薄膜,并就薄膜的物相结构、微观组织、导电性能及透光性等进行了研究分析.结果表明:薄膜的方电阻和透光性与提拉速度、提拉次数、热处理温度、冷却方式及Sn原子掺杂量等因素有关.当Sn原子掺杂量为12.5%(质量分数)、提拉速度为80 mm/min、经5次提拉且每次提拉后经550℃热处理(炉外空冷)而最终制得的ITO薄膜的方电阻为110 Ω/□,透光率可达90%以上.用溶胶-凝胶法制备ITO薄膜具有工艺简单可控,成本较低且宜于大面积成膜等优点.     

尖晶石LiMn2O4薄膜的溶胶-凝胶制备

以柠檬酸为螯合剂，与硝酸锂和硝酸锰形成均匀稳定的溶胶，采用旋转涂布（Dip—coating）技术在不锈钢或单晶硅基片上沉积LiMn204正极薄膜，考察了升温速率、退火温度等对其形貌、组成以及结构影响。结果表明：随着退火温度降低以及升温速率的减小，薄膜的表面均匀性增加；在升温速率1℃／min，700℃时退火2h获得了与基片结合性能良好、表面均匀、无裂缝、无剥落现象的具有尖晶石结构的纳米LiMn2O4薄膜，有望作为阴极材料用于全固态薄膜锂离子电池。     

Structure stability and corrosion resistance of nano-TiO2 coatings on aluminum in seawater by a vacuum dip-coating method

A stable nano-TiO₂ coating was prepared by vacuum dip-coating TiO₂ sol-gel onto the anodized aluminum surface. The effect of vacuum dip-coating method and anodization pretreatment on compactness and stability of the coatings was proved. The structure and composition of the coatings were characterized by means of scanning electron microscopy (SEM) and X-ray diffraction (XRD). The results indicate that the surface of coatings is uniform and compact, with high load capacity. The particles of TiO₂ anatase is filled into the Al₂O₃ nano-pores formed by anodization. The electrochemical measurements show that the nano-TiO₂ coatings significantly decrease the corrosion currents densities (i_corr), as simultaneously increased the values of polarization resistance (R_t) of aluminum. It indicates the nano-TiO₂ coatings exhibit excellent anticorrosion properties in sterile seawater at the room temperature.     

实心多孔支撑体全膜化微型固体氧化物燃料电池的制备及性能

提出一种实心多孔支撑体全膜化微型固体氧化物燃料电池(micro solid oxide fuel cell,μSOFC)设计模型.电池用氧化钇部分稳定的氧化锆[(ZrO2)0.97(Y2O3)0.03,partially stabilized zirconia,PSZ]多孔陶瓷作为支撑体,在其上制备NiO-YSZ阳极层,分别采用离心和浸渍两种成膜工艺制备YSZ电解质膜,以La0.8Sr0.2MnO3-YSZ复合材料为阴极,对组装好的单电池进行了电化学性能测试.在850℃和800℃时,离心沉积工艺制备的单电池最大输出功率密度分别为286 mW/cm2和254 mW/cm2,而浸渍涂布法制备单电池的最大输出功率密度则分别达到572 mW/cm2和388 mW/cm2.电化学阻抗谱显示;电极极化是影响电池性能的主要因素.     

金属--浸塑涂装技术

叙述了粉末流化床浸塑涂装金属的技术。     

Lubricant layer formation during the dip-coating process: influence of adsorption and viscous flow mechanisms

Thickness and structure of Z03, Z-Dol, Z-tetraol and AM2001 lubricant layers dip-coated on amorphous carbon surfaces were studied as a function of the dwell time in solution and the pull-out speed. The results demonstrate that the lubricant layer is formed via the joint action of surface adsorption and viscous flow mechanisms. Surface adsorption creates the bonded layer in the case of functionalized lubricants, whose thickness was found to be dependent on dwell time. The observed kinetics of the surface adsorption was described as a reversible second order process. The viscous flow mechanism is responsible for the formation of the mobile layer, whose thickness only depends on the pull-out speed.     

PZT薄膜反提拉生长的PbO挥发与退火条件研究

通过一新的溶胶-凝胶工艺:反提拉涂膜方法,在Si(100)和Pt(111)/Ti/SiO2/Si(100)基片上制备了PZT(Zr/Ti=52/48)铁电薄膜,并研究了退火工艺及其PbO的挥发对薄膜微结构、表面形貌、取向、及铁电性能的影响.本文首次提出并应用反提拉涂膜技术制备了PZT薄膜,此技术相对于传统的溶胶-凝胶工艺具有以下几方面的优点:操作控制简单方便、成本低、原料利用率高、无污染等.研究发现PZT薄膜通过增加PT晶种层后可以抑制PbO的挥发,同时薄膜呈现较强的(110)取向;在薄膜的退火处理过程中还发现氧气氛有助于降低PbO的挥发、促进晶粒的长大和降低钙钛矿的晶化温度,在氧气氛中退火的PZT薄膜显示了很好的铁电性能,其剩余极化强度明显增大而矫顽场只有极小的增加.     

ZrO2-MoSi2/Ni-Si-Mo FGM浸涂成形工艺

对采用粉浆浸涂工艺制备ZrO2-MoSi2／Ni-Si-Mo FGM进行了研究。研究结果表明，采用粉浆浸涂成形ZrO2-MoSi2／Ni-Si-Mo FGM时，每层预涂层的临界厚度为250μm，临界提出速度为0．05mm／s。脱脂、烧结工艺为：5℃／min升温到280℃保温10min，1℃／min升温到500℃保温4h，10℃／min升温到1300℃，5MPa热压1h；脱脂和烧结气氛为氩气气氛。     

Vi-PDMS/S-SiO2超疏水聚酯纤维织物的制备及性能研究

目的 基于普通织物材料防水性较差的问题,制备一种具有超疏水涂层的聚酯纤维织物,并对其性能进行研究。方法 以聚酯纤维织物为基材,基于紫外光固化技术通过浸涂法,使用商用气相纳米SiO₂颗粒(S-SiO₂)、端乙烯基聚二甲基硅氧烷(Vi-PDMS)在织物表面构筑微纳粗糙结构,获得超疏水的织物。采用扫描电子显微镜、水接触角测量仪对其微观结构和疏水性能进行表征,并通过机械摩擦实验对其超疏水稳定性进行考察。结果 当Vi-PDMS和S-SiO₂质量比为1∶4时,选择交联剂为三羟甲基丙烷三丙烯酸酯(TMPTA)制备的聚酯纤维织物表面的水接触角可达到151°,滚动角可达9°;且经过40次循环摩擦后,其表面水接触角仍大于140°,具有一定的耐磨性。结论 基于紫外光固化技术,采用操作简便的浸涂法制备的聚酯纤维织物具有优异的超疏水性能和一定的耐磨性,为织物超疏水性能研究提供参考,有望应用于超疏水聚酯纤维织物领域。