A columnar Al film was firstly deposited on the top of 7% Y2O3-stabilized zirconia (7YSZ) ceramic coating in thermal barrier coating (TBC) system by magnetron sputtering. A vacuum treatment was then carried out at 700 degrees C for 1 h and 900 degrees C for 5 h to improve the erosion resistance of Al-deposited TBC. A alpha-Al2O3 layer was in situ synthesized on the top of 7YSZ coating via vacuum heat treatment. The microstructure evolution of Al-deposited TBC illustrated that a loose surface-layer and a dense sub-layer formed on the top of 7YSZ coating after vacuum treatment. The phase structures of the as-sprayed TBC and the Al-deposited TBC after vacuum heat treatment were characterized by X-ray diffraction (XRD) and transmission electron microscope (TEM) assisted with focused ion beam (FIB). Particulate erosion resistances of the as-sprayed TBC and treated TBC were compared at room temperature. In addition, erosion mechanism and schematic diagram were proposed. The results show that the Al-deposited TBC after vacuum heat treatment has better particulate erosion resistance than the as-sprayed one.

Diamond-Cu composites have been considered to be the next generation of electronic packing materials. One of the key stumbles for such an application is the joining problem between diamond-Cu composites and other materials due to the poor wettability of the diamond particles in the composites. In order to overcome this hurdle, pure Cu powder was thermally sprayed onto diamond-Cu substrate by low-temperature high-velocity oxygen fuel spraying process. Microstructure and some fundamental properties of the coating obtained were systematically investigated, and morphologies of the single splat deposited on the diamond-Cu substrate were also observed. The splats obtained have good adhesion with the substrate as fine particles flattened sufficiently, while the coarse particles were significantly deformed. The coating was quite dense with porosity lower than 1%, oxygen content under 0.5% and thermal conductivity about 266 Wm(-1) K-1 and still remained on the diamond-Cu substrate after 50 thermal shock cycles between 300 A degrees C and water bath at room temperature. Meanwhile, the solderability of the coating was significantly improved. Therefore, Cu coating deposited on diamond-Cu substrate by low-temperature high-velocity oxygen fuel spraying process can be beneficial in electronic industry assisting with soldering and improved wettability for joining of other materials.

AlN films were prepared on Si(100) and quartz glass substrates with high deposition rate of 30 nm.min(-1) at the temperature of below 85 degrees C by the magnetic-filtered cathodic arc ion plating (FCAIP) method. The as-deposited AlN films show very smooth surface and almost no macrodroplets. The films are in amorphous state, and the formation of AlN is confirmed by N1s and Al2p X-ray photoelectron spectroscopy (XPS). The XPS depth profile analysis shows that oxygen is mainly absorbed on the AlN surface. The AlN film has Al and N concentrations close to the stoichiometric ratio with a small amount of Al2O3. The prepared AlN films are highly transparent over the wavelength range of 210-990 nm. The optical transmission spectrum reveals the bandgap of 6.1 eV. The present technique provides a good approach to prepare large-scale AlN films with controlled structure and good optical properties at low temperature.

In general, it is accepted that thermal barrier coating (TBC) with good CMAS (CaO-MgO-Al2O3-SiO2) corrosion resistance has long lifetime. A columnar Al film was firstly deposited in this work at the top of 7 wt.% yttria-stabilized zirconia (7YSZ) TBC by magnetron sputtering. Then a vacuum treatment of Al-deposited TBC was carried out at 700 degrees C for 1 h and 900 degrees C for 5 h. An alpha-Al2O3 layer was in situ synthesized at the top of 7YSZ TBC through the reaction of Al and ZrO2 after vacuum heat treatment. The CMAS corrosion resistance of as-sprayed TBC and treated TBC was compared after isothermal test of 1200 degrees C for 24 h. The results indicated that the Al-deposited TBC after vacuum heat treatment has better CMAS corrosion resistance than the as-sprayed TBC. Two mechanisms are considered to contribute to the protective effect of in situ synthesized alpha-Al2O3 layer: the first is alpha-Al2O3 partially filling existed open pores and cracks in the top 7YSZ coating to hinder the penetration of molten CMAS; and the second is alpha-Al2O3 a reacted with CMAS forming CaAl2Si2O8 and MgAl2O4 that play the role in inhibiting further infiltration of CMAS. (C) 2014 Elsevier B.V. All rights reserved.

The spatial distribution of resources and services needs to be planned and allocated thoroughly in order to satisfy the demands of social justice. The spatial accessibility indices are well-known for their significant roles in the fields of planning and allocation for resources. In this paper； we present a Spatial Resource Allocation Model based on Justice Principle. In the model； a group of linear equations of the supplies' resources are deduced according to the gravity-based accessibility index. The model consists of two submodels: one is for supply； and another is for demand. The submodel for supply ensures that every supply has the same gravity-based accessibility index； which is equal to the total demands-total supplies ratio in the value of 1. At the same time； the just allocation submodel for demand ensures that every demand has the same gravity-based accessibility index； which is equal to the total supplies- total demands ratio in the value of 1. The Matlab-based commands are utilized to implement the model and an application example is given to demonstrate the utility and effectiveness of it.