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29 results on '"Li, Muqin"'

12. Microstructure of fly ash cenosphere/AZ91D composite during solution treatment at 380-420℃

Author

Huang Zhiqiu, Yu Sirong, and Li Muqin

Subjects
composite materials, liquid–solid reactions, quenching, microstructure, Technology, Manufactures, TS1-2301
Abstract

The fly ash cenosphere/AZ91D (FAC/AZ91D) composites containing 5 wt.% and 100 µm in size of fly-ash cenosphere particles were fabricated by means of the compcasting method. The microstructures of the as-cast samples and the effect of the solution treatment at 380℃, 400℃, and 420℃ for 16 h on the microstructures of the samples were investigated by using of OM, SEM, XRD and EDS. The results showed that the cenospheres distributed homogeneously in the Mg alloy, and were almost filled with Mg alloy. The main interfacial phase between the cenospheres and AZ91D Mg alloy was identified as MgAl2O4 according to XRD, EDS and thermodynamic analysis. Mg2Si particles tended to be spheroidized via the solution treatment and the β phase (Mg17Al12) dissolved completely at 400℃.

Published
2011

18. Structural and Hydrophilic Characteristics of N-doped TiOx Films Deposited by RF-Magnetron Sputtering

Author

Li Muqin, Cheng Chunyu, Lin Zeng, and Wang Fang

Subjects
Materials science, Annealing (metallurgy), technology, industry, and agriculture, General Engineering, Analytical chemistry, 02 engineering and technology, Sputter deposition, Atmospheric temperature range, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 0104 chemical sciences, Amorphous solid, Contact angle, Crystallinity, X-ray photoelectron spectroscopy, Sputtering, 0210 nano-technology
Abstract

Nitrogen doped titanium oxides (N-doped TiO x ) films were deposited by sputtering the TiO 2 target in N 2 /Ar gas mixture to control the doping amount of nitrogen accurately. In order to modify the resultant films, the samples were annealed in air in a temperature range of 300 ∼ 600 ° C, and then they were irradiated under visible-light (VIS) after being placed in dark. X-ray photoelectron spectroscopy (XPS) spectra show that N-Ti-O ( β -N) and hydroxyl form in the films due to nitrogen doped into TiO x lattice. And the content of hydroxyl increases with annealing temperatures increasing, which leads to the better hydrophilicity. X-ray diffraction (XRD) was used to investigate the crystallinity of the films annealed at different temperatures and the results indicate that the amorphous films transform into crystalline phase as a consequence of annealing. Scanning electron microscopy (SEM) results reveal that the particle size becomes bigger at the higher temperature. Hydrophilicity was tested by contact angle meter. The results show that the water contact angle decreases with raising heat treatment temperature due to the change of particle size and the content of −OH. Hydrophilicity is also influenced by the storing process, and the water contact angles increase with time. Furthermore, the hydrophilicity of N-doped TiO x films increases under visible light (VIS) irradiation.

Published
2016

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