Advanced Materials Research Vols. 915-916

Abstract: The results of a study of the effect of surface modification of steel materials with shape memory effect based on TiNi, TiNiCu, and NiAl on the functional and mechanical properties of the samples are reported. Experimental studies have shown the efficiency of the developed technologies. A substantial increase in wear resistance, and friction durability under cyclic loading was found. It is shown that the most universal characteristic of wear-fatigue properties is adaptability, which is determined by the multi-fractal structure of the parameterization.

Abstract: The aluminum salt flame retardants powders are prepared with ammonia and aluminum chloride hexahydrate by chemical precipitation method under different conditions. The effect of the reaction temperature, ammonia concentration and aluminum ion concentration on the particle diameter are systematically studied. In addition, the effects of additions on the particles diameter of aluminum salt flame retardants are also explored by adding different additions in the experiments. On the basis of the experimental results, the process conditions synthesizing the minimum particle diameters are obtained, which may provide the beneficial reference for inorganic flame retardant powders.

Abstract: As the main substrate materials for solar cell, Czochralskisilicon (CZ-Si) has more crystal defects, higher impurities content and so on, which limit the further improvement of conversion efficiency (h). Floating zone melting silicon (FZ-Si) has excellent performance but the feed rod cost is much higher, so it is hardly used for solar cell widely. To solve this problem, we developed CFZ silicon monocrystal (CFZ-Si). First the poly was made into poly rod withΦ110~Φ130mm by CZ process and then made into CFZ-Si by FZ method. During FZ process, the resistivity is controlled by gas doping and the process is adjustable. CFZ-Si combines advantages of CZ-Si with FZ-Si. It has less crystal defects, lower impurities content especially oxygen content (<0.2 ppm) and excellent consistency of axial resistivity. Meanwhile, poly rod used has lower price and easier fabrication, so CFZ-Si cost is much lower and the further cost reduction is easy. Therefore, CFZ-Si has significant comprehensive advantages and broader prospect in the future photovoltaic field.

Abstract: According to domestic and international history of foam glass, the foam glass development situation of the United States, France, Japan, the former Soviet Union and China was specifically introduced. Moreover ,the foam-glass-production-lines history was divided by generations and the production-lines characteristics each generation was presented in detail. Compared with the production scale ,investments and unit production cost of foam glass production line on different generations ,we could find that building high-generation production lines, increasing productivity, improving quality, reducing costs and enhancing competitiveness will be the development trend of foam glass industry in the future.

Abstract: Phosphor and silicone are common used packaging materials in LED fabrication and have great influence on the reliability of LED modules. In order to understand the effect of these materials, test LED samples were prepared with different sets of packaging materials. An aging test at a constant temperature of 125°C was performed to discover the failure process. The results of aging test shown that the luminance of all samples fell obviously. But the luminance decrease of samples without phosphor and silicone was the least. As to other samples, the carbonization of silicone and the consequent bubbles reduced the luminance rapidly. And the phosphor had the similar influence on the luminance. If phosphor and silicone were used at the same time, the luminance would reduce quickly and then the modules would fail.

Abstract: In order to solve NiuDong101 Well reservoir ultra high temperature (205 °C ) fluid fracturing low efficiency, quick acid rock reaction which usually adopt the 160°C fracturing fluid system. At the same time to meet the deep acid fracturing technology and greatly improve the output, so as to achieve the production increasing reserves of important target. So it is necessary to develop a novel 200°C fluid system to achieve high-efficient stimulation. Therefore, this paper invented a new high temperature resistant ternary anionic thickener, and launched some fracturing fluid performance evaluation. This fluid system achieved 176mpa.s under the condition of 200°Cand 170s^-1of RS600 which can perform good temperature resisting & shearing resistance performance, breakthrough the limit of 200°Cof fracturing fluid temperature resistance. Field application to achieve a major breakthrough, it has important strategic significance for exploration promotion of bohai bay basin.

Abstract: We report template-free electrochemical deposition method for preparing ZnO nanostructures arrays on indium tin oxides (ITO) glass substrate. Multiform ZnO nanostructures, such as nanotubes, nanorods with tower-like tips, cone-like tips and groove-like tips, are controllably synthesized at 60 °C, which is lower compared with the prepared temperatures of reported works. The results of XRD indicate the wurtzite ZnO nanostructures are single-crystalline and grow along the c-axis perpendicularly on the substrate. These findings have potential for the growth of high-quality ZnO nanostructures arrays and device applications.

Abstract: In this study, we study morphological transitions of diblock copolymer subjected to an applied external electric field by means of external potential dynamics simulation. With this method, the lamellar and the cylindrical phase aligned along the electric field directions are presented, and the kinetic pathways of lamellae are investigated.

Abstract: This article presents a recent study on the behavior of impedance versus frequency of fiber materials. When applying a constant amplitude, it was experimentally observed that the impedance of fiber materials first dropped steeply and then retained in a stable state being followed by a rapid increase with increasing inspiriting signal frequency. The overall impedance versus frequency curve revealed a bathtub-like shape. This behavior is therefore defined as bathtub phenomenon of fiber alternating current (AC) electric conductance. Analysis of the bathtub phenomenon, by using the circuit theory and medium polarization theory, revealed that there exist four different kinds of current in a fiber material when it is exposed to an AC electric field, viz., absorbing current, conductance current, charging current and superficial current. The study showed that this phenomenon is well consistent with and can be evaluated by the medium polarize theory. Understanding of the bathtub effect of fiber AC electric conductance provides a theoretical basis for development of a breaking-through solution to resolve many challenges of conventional impedance technique, such as greatness test error and electrode polarization, etc. The results of this research can be applied to the technology development of novel equipment design for the quick fiber moisture test.

Abstract: The traditional methods for the prediction of fatigue life of metallic material consider only the two processes of fatigue initiation and fatigue cracking, while the process from fatigue cracking to breaking has been neglected. This paper provides one new method of estimating the fatigue life of under-constant-amplitude loading spectrum---non-local gradient damage enhancement model method. Based on the finite element procedure and the partial damage model, this method inserts the non-local strain's definition formula into the loading function and damage rate increment formula. From this method, the non-partial gradient enhancement damage model is obtained. In this model, the material’s microscopic criterion factor and the material’s damage criterion have been considered, the process of endurance failure is also considered. Thus, the insufficiency of traditional research techniques is effectively avoided, the actual effect analysis of metallic material is more reasonable, and the actual operating mode is been conformed to.