Papers by Author: Jian Zhou

Abstract: Stainless steel/TiC nanocomposite powder were prepared by high-energy ball-milling method using 316 stainless steel powder, carbon and titanium powder as raw materials. Microstructure of the nanocomposite powder was investigated with XRD and TEM techniques. The results showed that the stainless steel/TiC nanocomposite powder obtained when the ball-milling time was more than 40 hours. DSC analysis method was used to study the characteristics of oxidation resistance and the oxidation reaction kinetics of the nanocomposites powder. Results show that the oxidant resistance of nanocomposite powder was improved, the activation energy of oxidation reaction increased.

Abstract: Na-doped ZnO thin films on Si (100) substrates and on pure ZnO buffer layers prepared by sol-gel method, with the pure ZnO buffer layer annealing at 1073K for 90 min. X-ray diffraction (XRD) analyses revealed that all the films had a polycrystalline wurtzite structure and high c-axis preferred orientation. Photoluminescence(PL) spectra showed that the thin films produced strong emissions near ultraviolet(UV) and weak defect-related deep-level emission in visible regions. In addition, the effects of pure ZnO buffer layers on the structural and optical properties are discussed.

Abstract: 316 stainless steel nano-grain powders were prepared by high-energy ball-milling method. The evolutions of grain size and microstructure of the stainless steel powders with the change of ball-milling conditions were investigated by XRD, SEM. DSC method was used to analyze the oxidation resistance of the powders after ball milling. The law of the change in oxidation weight gain and DSC oxidation peak of samples at the different heating rates were analyzed. Oxidation kinetics studies showed that the oxidant resistance of 316 stainless steel nano-crystalline powder was improved, the activation energy of oxidation reaction increased.

Abstract: The effects of a few added components, i.e. SnO2, Cr2O3 and Fe2O3, in porcelain glaze on thermal conductivity of porcelain glaze are studied in this paper. The thermal conductivities of several porcelain glaze samples with different contents of SnO2, Cr2O3 and Fe2O3 were measured with a special measuring apparatus at room temperature. The theoretical explanation for these measurement results is also sought according to the theory on heat transfer in solid materials, briefly.