High-Performance Ceramics III

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Authors: Wei Rong Huo, Jia Chen Liu, Yuan Fang Qu, Hai Yan Du
Abstract: For the nano-ZrO2 powders, it is difficult to disperse the particles in a highly concentrated electrolyte. Polymer MZN with composite structure was employed as a dispersant in this work. On the basis of having obtained the optimum quantity of dispersant MZN, the effects of process conditions on stability of Ni-ZrO2 composite electroplating bath were investigated via sedimentation experiments and SEM micrograph. The results showed that the charging sequence have a significant influence on the stability of composite electroplating bath, and the optimum process conditions is that the stable aqueous suspension of 2.5g nano-powders in 100 ml water should be prepared at first by milling for 3 hours, and then the electrolytes were added in it. The well-dispersed composite electroplating bath was obtained, which made sure that the nano-ZrO2 smaller than 30nm was found in the Ni matrix.
Authors: Zhi Ming Du, Xiao Min Cong, Peng Wang
Abstract: Carbonaceous fillers have been widely applied in electrically conductive coatings due to their cheaper, steady electrically conductive capability and other excellent performances. Electrically conductive coatings were synthesized by using graphite and carbon black as fillers in the alkyd resin matrices. Influences of various fillers on electrical conductivity of coatings have been investigated in detail.
Authors: Sheng Guo Lu, Haydn Chen
Abstract: LaNiO3 (LNO) has been used as bottom electrode layer for ferroelectric and antiferroelectric thin films due to its good conduction, preferred (100) orientation, same crystalline structure as many perovskite ferroelectrics and antiferroelectrics, good adhesion and compatibility with the Pt/Ti/SiO2/Si template. In this study we have investigated the ideal optimal post - annealing conditions for LaNiO3 thin films deposited at 450°C using a magnetron sputtering method. Heat treatment from 500 to 1200°C was performed. Scanning electron microscopy (SEM), x-ray diffraction (XRD) and electrical measurements were carried out to characterize the morphology, structure, and macroscopic properties. Results indicated that the LNO film had the best quality when annealed at about 800°C. Above this temperature, the morphology, structure and associated properties would deteriorate.
Authors: Zheng Guo Jin, Yong Shi, Ji Jun Qiu, Xiao Xin Liu
Abstract: CuInS2 thin films were deposited on galss substrate by successive ionic layer absorption and reaction (SILAR) method at room temperature. CuCl2, InCl3, and Na2S were used as precursor materials. The thin films were obtained during the dipping of 20-40 cycles and after annealing in the N2 atmosphere at 500°C. The characterization of the film was carried out by X-ray diffraction, scanning electron microscopy, optical absorption spectrum and X-ray photoelectron spectra. Quantification of the XPS peaks shows that the molar ratio of Cu:In:S of the film is close to the stoichiometry of CuInS2. XRD result demonstrated that the formed compound is CuInS2 with chalcopyrites crystal structure. Direct band gap was found to be 1.5eV from optical absorption spectrum.
Authors: G.C. Zhang, Bao Qing Zhang, Xu Ping Lin, Yun Fa Chen, Yu Xheng Xie
Abstract: The pore structure of supported organic-inorganic hybrid membranes was tested by modified gas permeation method. The results were discussed and compared with gas separation performances of the membrane. For the intermediate layer, the pore size is 225nm, which is in relatively good continent with the SEM observation. The pore size of SiO2/C6H5 organic-inorganic hybrid layer is 40-50nm, which is a little bigger compared with the gas separation performances. And for the SiO2/C6H5/MMA organic-inorganic hybrid layer, the pore is 24nm, which is close to the gas separation performances.
Authors: Zhong Min Zhao, Long Zhang, Jian Jiang Wang, Shi Yan, Jin Rong Cao
Abstract: The design on joining of metal and ceramics in composite pipes fabricated by the SHS metallurgical process is carried on with adding (TiO2 +Al+C+Ni) subsystem in(CrO3+Al) system, and the composite pipes with three-layer structure of steel substrate, intermediate alloy and lined ceramics are fabricated with low cost and high performance. Combustion determination and mechanical test indicate that adding suitable amount of Ni powder in combustion system rather than (NiO+Al) subsystem can cause combustion behavior of a whole system and volume fraction of the carbides to be controlled easily, and is beneficial to improve joining of the intermediate alloy and steel substrate, causing compression strength and compression shear strength of the composite pipes to be increased greatly.
Authors: Ik Jin Kim, Hae Jin Lee
Abstract: NaX molecular sieve films on ceramic paper prepared by in-situ hydrothermal method were investigated. The NaX zeolite seed crystals of a uniform size of 5 µm were synthesized by hydrothermal method in a mother solution having a composition of 3.5Na2O : Al2O3 : 2.1SiO2 : 500 ~ 1000 H2O. These dip-coated NaX seed crystals on ceramic paper lead to further the thickness (20 ~ 100 µm) of NaX film on the substrate at 90°C for longer 3~7 days in autoclave. Pure zeolite films consisting of a continuous intergrown of 5~ 20 µm NaX crystal have been prepared on the substrates. The zeolite films were characterized by XRD, SEM, BET and XRF.
Authors: Jing Hua Gu, Liang He
Abstract: BaCe0.9Y0.1O3-a and SrCe0.9Y0.1O3-a powders were synthesized by both the solid-state reaction method and the liquid citrate method. The shrinkage, porosity and relative density of membranes prepared from these powders were determined, after sintering at 1550°C (BaCe0.9Y0.1O3-a membrane) or 1450°C (SrCe0.9Y0.1O3-a membranes) for 3 hours. The XRD patterns show that the crystal structures of the prepared powders and the sintered membranes are orthorhombic perovskite structures. The membranes prepared from the powders synthesized by the solid-state reaction method are denser than those from the powders synthesized by the citrate method with the same composition under the identical sintering conditions.
Authors: Wang Cheng, Zong Qiang Mao, Jing Ming Xu, Xiao Feng Xie
Abstract: We propose self-humidifying polymer electrolyte membranes with highly dispersed nanometer-sized Titanium dioxides for proton exchange membrane fuel cells operated with dry H2 and O2. The nanosized TiO2 particles that have hygroscopic property are expected to adsorb the water produced from the cathode reaction and to release the water once the proton exchange membrane needs water. The preparation technology of nano-TiO2 particles in a commercial Nafion 112 membrane via novel in situ sol-gel reactions was developed, resulting in a semitransparent membrane with uniform distribution of TiO2 in the proton exchange membrane. It is found that Proton conductivity increases observably by dispersing 3 wt % nano-TiO2 in the Proton exchange membrane at low humidity condition, and the newly prepared TiO2-PEM improve the self-humidifying performance of Proton exchange membrane fuel cell.
Authors: Sheng Wen Zhong, Qian Zhang, De Qiang Han, Jing Zhong Kuang
Abstract: The rare earth of Er2O3, Nd2O3, Pr6O11 as pigmentation-type coating materials was used to coat the surface of mica by wet chemical deposition method. Then the color pearl luster pigment was synthesized by heat treatment. The coating was carried out by multiple-coating technique and the influence of technique parameters on the coating was studied systematically.

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