用涂布共烧结法制备固体氧化物燃料电池

以８％Ｙ２Ｏ３稳定的超细ＺｒＯＺ２（８ＹＳＺ）粉末为固体电解质材料，以喷雾热解法制备的超细Ｌａ０．８Ｓｒ１－ｘＭｎＯ３、（２０ＬＳＭ）粉末为空气极电极材料，以ＮｉＯ／８ＹＳＺ粉末为燃料电极原料，采用浆料涂层共烧结法制备电极薄膜，并组装了固体氧化物燃料电池（ＳＯＦＣ）。在Ｈ２－Ｎｉ－８ＹＳＺ－２０ＬＳＨ－Ａｉｒ体系中，分别测定了８００℃用１０００℃时的开路电压及电池Ⅰ—Ⅴ特性曲线。     

在MgO衬底上生长YBCO薄膜

在ＭｇＯ衬底上生长ＹＢＣＯ薄膜美国海军科研实验室的科研人员应用金属有机物化学气相沉积法，在梯形（１００）ＭｇＯ衬底上成功地生长出了ＹＢａ２Ｃｕ３Ｏ（７－ｓ）超导薄膜。当外延薄膜厚度为１００ｎｍ时，其超导转变温度为８８Ｋ，临界电流密度为２×１０６Ａ／ｃ...     

磁控溅射法制备YBa2Cu3O7—x双面超导薄膜

采用在直径中这柱状阴极磁控溅射装置和筒形加热器制备了高质量ＹＢａ２Ｃｕ３Ｏ７－ｘ双面超导薄膜。使用衬底为（００１）ＬａＡｌＯ３和（００１）ＹＳＺ。双面超导薄膜零电阻温度ＴＧ＝８９～９１Ｋ,临界电流密度ＪＣ≥１０＾６Ａ／ｃｍ＾２（７７Ｋ,零场下）,微波表面电阻ＲＳ〈１ｍΩ（７７Ｋ,１０ＧＨｚ）。对不同氧氩比下制备的双面膜进行了性能的比较。当Ｏ２：Ａｒ＝１：２．５,衬底温度在８００℃时,制备出了高质量     

ZCGS浸入式水口材料与钢中Al_2O_3反应性能的研究

通过对ＺＣＧＳ（Ｚr０２一Ｃａ０一Ｃ-Ｓｉ０２）材料的热力学分析,选用了以ＺＣＧＳ材质为内壁与Ａｌ２Ｏ３－Ｃ基体制成复合浸入式水口,经现场工业试验表明,对要求钢中酸溶Ａ１较高的优质低合金１６ＭｎＲｅＬ钢进行浇铸时,该复合浸入式水口具有良好的抗Ａｌ２Ｏ３沉积效果,能够满足铝镇静钢及优质低合金钢多炉连铸的要求。     

低表面电阻的YBCO超导薄膜结构及其应用

低表面电阻的ＹＢＣＯ超导薄膜结构及其应用王小平，杨秉川，石东奇，李文祥，华佩文，孙丽虹，张启海（北京有色金属研究总院１０００８８）关键词：ＹＢＣＯ，薄膜结构目前，ＹＢＣＯ超导薄膜在微波领域受到了足够的重视，这是由于钇系薄膜的微波表面电阻比银、金的微波...     

金属和夹杂物在连铸ZrO2—CaO—C浸入式水口沉积的机理

通过实验室试验，研究了金属和氧化铝在ＺｒＯ２－ＣａＯ－Ｃ耐火材料上的沉积条件（ 相对于Ａｌ２Ｏ３－Ｃ耐火材料），结果概述如下：（１）以前报道了 ，铝含量低或氧化铝夹杂物少的时候，和ＡＧ比ＺＣＧ耐火材料更不易沉积。正相反，就某些铝和非金属夹杂物含量来说，ＺｒＯ２－ＣａＯ－Ｃ耐火材料比ＡＧ更容易沉积。（２）沉积可能分两步，第一步是浸入钢水很短时间内，在热面上形成氧化薄膜层（网状氧化铝），第二步是非金属     

MOD法制备YBCO超导薄膜

论述了金属有机化合物热解法即ＭＯＤ法制备高温超导氧化物薄膜的优越性及可行性。详细介绍了以三氟乙酸盐为金属前驱物，用ＭＯＤ法制备ＹＢＣＯ超导薄膜的方法并对观察结果进行了分析讨论。在１０×１０×０．５ｍｍ￣３Ｚｒ（Ｙ）Ｏ＿２单晶抛光衬底上，用ＭＯＤ法成功地获得了Ｔ＿（ｃｏ）＝８２Ｋ的ＹＢＣＯ超导薄膜。     

用分割靶法制备Y_（1－x）Ho_xBa_2Cu_3O_（7－δ）超导薄膜

本文利用直流磁控溅射技术，在（１００）钇稳定的ＺｒＯ２基片上制备出ｃ轴取向很好的Ｙ１－ｘＨＯｘＢａ２Ｃｕ３Ｏ７－δ（０＜ｘ≤１）超导薄膜。实验中所用的靶材由ＹＢＣＯ和ＨＢＣＯ超导材料各一半组成。随着ＨＢＣＯ靶材到加热器距离的变化，钬的含量发生变化，当ｘ＝０．７（原子比），零电阻温度Ｔ∞＞８３Ｋ。     

超导磁屏蔽对高Tc-SQUID磁强计噪声的影响

在ＳｒＴｉＯ３（ＳＴＯ）双晶衬底上激光沉积ＹＢＣＯ超导薄膜,并光废成ＤＣ ＳＱＵＩＣ,在超导屏蔽和μ合金屏蔽桶两种情况下,测量了ＣＤ ＳＱＵＩＤ磁强计的噪声,前种情况下的噪声只是后种情况下噪声的三分之一。     

SiC陶瓷常压烧结研究

研究了ＳｉＣ粉末粒度、助剂Ａｌ２Ｏ３＋Ｙ２Ｏ３加入量和Ａｌ２Ｏ３与Ｙ２Ｏ３的配比等因素对ＳｉＣ陶瓷材料性能的影响。结果表明，添加Ａｌ２Ｏ３＋Ｙ２Ｏ３助剂可实现ＳｉＣ陶瓷的低温（１８５０℃）常压烧结。ＳｉＣ粉末粒度是影响可烧结性的重要因素之一，助剂加入量为２０％，Ａｌ２Ｏ３与Ｙ２Ｏ３之比为１：１时材料性能较好。     

Effect of humidity on microstructure and properties of YBCO film prepared by TFA-MOD method

Epitaxial YBCO superconducting films were deposited on the single crystal LaAlO3. (001) substrate by metal organic deposition method. All YBCO films were fired at 820 ℃ in humidity range of 2.6%-19.7% atmosphere. Microstructure of YBCO thin films was ana-lyzed by means of X-ray diffraction (XRD) and scanning electron microscopy (SEM). Superconducting properties of YBCO films were measured by four-probe method. XRD results showed that the second phase (such as BaF2)and a-axis-oriented grains existed in the films prepared at 2.6% humidity condition; a-axis-oriented grains increased in the film prepared at higher than 4.2% humidity condition; almost pure c-axias-oriented grains existed in the films fired at 4.2% humidity condition. Morphologies of the YBCO films showed that all films had a smooth and crack-free surface. YBCO film prepared at 4.2% humidity condition showed Jc value of 3.3 MA/cm2 at 77 K in self-field.     

超低压等离子喷涂YSZ涂层显微组织结构研究

采用超低压等离子喷涂技术(Plasma Spray-Physical Vapor Deposition,PS-PVD)制备了YSZ涂层,对涂层的显微组织结构进行了分析,并对比了粘结层表面不同预处理对于YSZ涂层生长趋势的影响规律。研究结果表明:MCrAlY涂层致密,孔隙率为1.5%,结合强度达83.2MPa;YSZ涂层呈现明显的柱状晶结构。粘结层表面粗糙度对柱状晶生长方向影响较大,表面粗糙度越小,柱状晶生长方向越趋于一致,基本沿法向生长。在超低压状态下,涂层不存在"遮蔽效应",可实现异型面涂层制备。     

采用TFA-MOD技术在LaAlO3单晶基片上制备YBa2Cu3O7-x涂层导体

三氟乙酸盐-金属有机沉积技术（TFA-MOD）是制备钇钡铜氧涂层导体的有发展前景的方法之一。采用TFA-MOD技术在铝酸镧单晶基片上制备出YBa2Cu3O7-x涂层导体，并对不同烧结温度下制备的薄膜作了分析比较，找到了较为合适的烧结温度。用X射线衍射进行了物相的定性分析，由YBCO薄膜的（103）φ扫描图谱分析了薄膜的外延生长，用原子力显微镜观察了薄膜表面形貌。结果 表明制备出的YBCO薄膜表面均匀致密、无明显裂纹、有较强的（001）衍射峰。     

第二代YBCO超导带材的主要制备方法与研究现状

介绍了第二代超导带材基底与YBCO涂层的多种制备方法.详述了离子束辅助沉积IBAD,压延辅助基底RABiTS,倾斜基底沉积ISD等基底制备技术以及金属有机物沉积MOD,低成本电泳沉积等YBCO涂层制备技术.列举了国际上各机构第二代YBCO超导带材的研究和发展现状.     

Deposition of Biaxially Aligned YSZ Layers on Polycrystaline Metallic Substrate

ＴｈｅｇｒｏｗｔｈｏｆｈｉｇｈｑｕａｌｉｔｙｆｉｌｍｓｏｆＹＢａＣｕＯ（ＹＢＣＯ）ｏｎｐｏｌｙｃｒｙｓｔａｌｉｎｅｍｅｔａｌｉｃａｌｏｙｓ，ｓｕｃｈａｓｓｔａｉｎｌｅｓｓｔｅｅｌｏｒｎｉｃｋｅｌｂａｓｅｄａｌｏｙｓ，ｉｓｄｅｓｉｒａｂｌｅｆｏｒｅｌｅ...     

Fabrication of NiO Buffer Layer for YBCO Coated Conductors by Combining Sputtering and SOE Method

In research of YBCO coated conductors, the development of a oxide template for epitaxial growth of YBCO is very important. Matsumoto et al have demonstrated the potential of the surface oxidation epitaxial (SOE) route for formation a cube textured NiO layer on nickel tapes. The epitaxial NiO functions as a buffer layer of chemical reaction between YBCO and nickel, and as a template for the epitaxial growth of YBCO. However, the surface quality of NiO is difficult to control and defects such as crack, spall and deep grooves exist in SOE NiO layer. A new approach combining sputtering and SOE method to obtain crack-free and cube textured NiO layer were reported. Ni tapes prepared by the combination of rolling and recrystallization were used for this work. A coating of Ni was first deposited on the tapes via magnetron sputtering. Then on the coating tapes, continuous and textured NiO layer were achieved by SOE technology.     

Metallic porous supports and ceramic interface layer development for H2 separation membranes

Abstract

Hydrogen separation membranes are typically composed of three components: the porous support (ceramic or metallic, as studied in the present work), the porous ceramic interface layer and the hydrogen selective dense layer (usually Pd or a Pd based alloy). The development of a good support and an appropriate ceramic interface layer is a key issue in the high performance membrane manufacturing process. Metallic supports specifically developed for this application have yet to be developed; those used have different features and are manufactured for applications such as filtering devices. There is a clear need to develop porous supports for hydrogen separation membranes that have good surface quality (roughness and pore size) to allow the deposition of a thin selective layer (typically of Pd). In addition, the development of the ceramic layer is of importance, to allow the deposition of a Pd continuous layer of minimum thickness to increase hydrogen permeation and decrease manufacturing costs by minimising use of expensive Pd. The development and characterisation of a thin Pd–Ag membrane deposited by PVD on a composite metallic–ceramic porous support is reported. The surface properties of AISI 316L and nickel supports were improved and the interdiffusion of Pd and Ag was avoided by deposition of an yttria stabilised zirconia (YSZ) layer by dip coating of nanosized YSZ powders.     

YBCO带材直流冲击特性的LM神经网络预测

柔性直流电网中的直流(DC)侧短路故障电流会严重危害电网的运行,而电阻型超导故障限流器(RSFCL)能有效地限制短路故障电流的增长,降低对直流断路器开断容量和开断时间的要求.为了研究用于RSFCL的氧化钇钡铜(YBCO)超导带材在短时直流冲击电流下的电阻特性,根据故障电流特征搭建了高压直流冲击平台,实验测量了在不同电流...     

Probabilistic Exner Sediment Continuity Equation for Mixtures with No Active Layer

The Exner equation of sediment continuity is the foundation of river morphodynamics. Generalization of this equation to mixtures of grain sizes has required the introduction of an active layer (i.e., a buffer layer between the sediment moving in the water column and the immobile substrate below). The active layer is defined to be a well-mixed layer, with no vertical structure, that encompasses those grains available to exchange directly with the moving sediment. The sediment in the substrate below exchanges with the active layer only as the bed aggrades or degrades. The active layer concept is a useful one that has served the research community well for 3 decades. However, the division of the erodible bed into a discrete active layer and substrate must represent only an approximation of a more general formulation that contains no active layer and in which parameters pertaining to the entrainment from and deposition to the bed vary continuously with depth below the sediment-water interface. Here the probability density function of bed elevation is used to derive a general Exner equation of sediment continuity with no discrete layers. The formulation is applicable to both sediment mixtures and tracers in uniform sediment. Although the treatment requires more information than that of the active layer approach, it offers the prospect of a better understanding of how streams create a stratigraphic record of their activities through deposition.     

Direct Laser Metal Deposition of AISI H13 Cladding on Copper–Beryllium Alloy Substrate Through a Stainless-Steel Buffer Layer Strategy

AISI H13 cladding is deposited on the copper–beryllium (CuBe) alloy substrate by direct laser metal deposition via a buffer layer strategy. The SS316L austenite stainless steel is used as the buffer material attempting to reduce the risk of cracking. Single- and multi-layer samples are deposited, including single-layer SS316L, 1-layer SS316L + 1-layer H13, 2-layers SS316L + 1-layer H13, and 1-layer SS316L + 4-layers H13. The defect-free single-layer SS316L cladding is successfully deposited after the parameter pre-optimization. Two types of defects including porosity and cracking are observed in all multi-layer systems. The cladding microhardness of the 2-layer system is rather low (400HV). A 50% increase in the cladding microhardness is observed when depositing on the five-layer system. The five-layer system shows a better load-bearing capability (LBC) compared with the CuBe substrate in the low loading range. As load increases above 10 kN, the five-layer cladding system shows the worse LBC compared to CuBe due to the low strength of the heat-affected zone. A 2.7% cladding to substrate thickness ratio allows keeping more than 80% of the original thermal conductivity of the CuBe substrate.