Advanced Materials Research Vols. 490-495

Abstract: The influences of converter temperature on decomposition and slagging of limestone were discussed by industrial tests and numerical calculation. The results showed that heat transfers quickly in the internal of limestone because heat energy is sufficient and surface of limestone is constantly updated in convertor, which makes the temperature of the centre of spherical limestone particle higher than the decomposition temperature, but the decomposition reaction has not arrived at the centre. Consequently, it is deduced that heat transfer is not the restrictive step of limestone decomposition in convertor steelmaking process.

Abstract: In this work, the Si layer is deposited on the SiC complex substrate which is composed of Si(111) substrate and 3C-SiC film grown on it. These Si and 3C–SiC films grown under different temperatures in a chemical vapor deposition system are analyzed. The crystalline orientation, the crystalline quality and the conduction type of the films are measured by X-ray diffraction, Raman scattering ,Scanning electron microscope, and 1150 °C is found the optimized temperature for the epitaxial growth of SiC film grown on the carbonized layer. Measurement results also show that the epitaxial layer is n-type 3C-SiC which has the same crystalline orientation with the Si (111) substrate. Si film grown on the SiC complex substrate under the temperature of 690 °C has the best crystalline quality. This film is composed of p-type monocrystal Si and has the same crystalline orientation with the substrate.

Abstract: In this article, based on nucleation and growth mechanism of films, different process conditions of rapid thermal annealing (RTA) had been investigated to attain different orientation and the crystallinity of PZT film. At first, the PZT films had been fabricated by magnetron sputtering on Si/SiO2/Ti/Pt substrates, then crystallized by different stepped rapid thermal annealing process. X-ray diffraction (XRD) was used to analyze the crystal structures of the films and scanning electron microscope (SEM) was used to analyze the surface morphology of the films. As a conclusion about the research is that it is good for controlling the crystallographic orientation and enhancing the crystallinity of PZT film by different stepped rapid thermal annealing process

Abstract: Co\N codoped mesoporous TiO2 thin films that adhered to the glass slides were prepared with normal temperature complexation method by using tetrabutyl titanate(TBT) , triethylamine(TEA), cobalt dichloride hexahydrate．The XRD patterns of the samples of the thin films indicated that the sample appeared sharp titanium ore and rutile characteristic peaks and characteristic peaks became wide．And the photocatalytic degradation study of dioxins from MSW ash had been carried out. The result showed that the mesoporous TiO2 thin films Co\N codoped had high photocatalytic efficiency and was in favor of the regeneration and reuse.

Abstract: This paper described the theory of parameter identification of Li-ion battery base on least square method. The result of voltage response by HPPC test is discussed. The model parameter is identified through least square method. The battery model is built with Matlab/Simulink and the identified parameter is verified. The result indicated that the least square method is suitable for parameter identification of Li-ion battery equivalent circuit model.

Abstract: The SiCp/Al-30Si composite material was prepared by hot-pressing. The microstructure was characterized by means of optical microscope and SEM, the thermal expansion performance was tested by PYC-Ⅲ Thermal Expansion Coefficient Tester. It was researched that the influence of SiC particle size and manufacture technology on the microstructure and thermal expansion coefficient. Results show that shortening soaking time decreases the number and the size of the nascent and precipitating Si particles, enlarges the CTE of the composite; lager pressure is beneficial to reduce the CTE of the composite, and the larger the pressure is, the more compact microstructure is and the less number of holes are. Thermal expansion performance of the composite was influenced by SiC particle size, distribution of matrix phase, trait of interface combination and the holes.

Abstract: Compound Al_0.75Fe_1.25(PO₄)₂, a inverse spinel-type metal compound, was prepared by a solid state reaction crystallization method. The Li+ extraction/insertion with this material were investigated by X-ray, FT-IR spectroscopy, and Kd measurement, The chemical analysis showed that the Li+ extraction/insertion be progressed mainly by an ion-exchange mechanism. The acid treated samples had an ion exchange capacity of 4.0mmol/g for Li+. It had a memorial ion-sieve property for Li+.

Abstract: Bulk metallic glasses (BMGs) of Cu45Zr48-xAl7Tix with x= 0, 1.5, and 3 at.% were prepared by copper mould casting. The corrosion resistance of the BMGs with different Ti contents was examined by potentiodynamic polarization tests and weight loss measurements in 1 N NaOH, 1 N H2SO4, 1 N H2SO4 + 0.01 N NaCl and 0.5 N NaCl solutions, respectively. The newly-developed BMGs’ corrosion resistance in Cl-- or both H+ and Cl--ions containing solutions can be greatly enhanced. The influence of Ti addition on glass forming ability (GFA) and thermal stability was investigated by x-ray diffraction and differential scanning calorimetry in detail. The alloy containing 1.5 at.% Ti exhibits the largest GFA, the critical size comes up to 10 mm in diameter.

Abstract: The high-pressure optical properties of the spinel γ-Si3N4 material have been calculated by the plane-wave pseudo-potential method. Our calculated lattice constant is in agreement with the theoretical results and available experimental data. γ-Si3N4 can be used as anti-reflection coatings in the energy range of 10eV～21eV due to high reflectivity. The electromagnetic wave (frequency: 8eV～17eV) can easily traverse the γ-Si3N4 crystal. The peak of the energy loss function is located around 22eV. More importantly, our calculated dielectric constant is 4eV (at 30GPa), which is in agreement with the calculated value.

Abstract: With wide use of mold in modern industry, to extend its service life has become urgent problem to solve. Based on its usage, components of mold can be divided into 2 parts. One is structural parts which consist of guide, set (dynamic) template, ejecting machine, supporting member, etc. These are usually made of low carbon structural steel, alloy structural steel, or carbon tool steel. the other is molding parts which include cavity, type core, forming insert, etc. these are key parts for direct molding. Because they must bear temperature, pressure, erosion, wear and tear when used, the service life depends on material of them. Appropriate material is the main way to extend its service life.