Applied Mechanics and Materials Vol. 422

Abstract: This paper analizes the mechanism of problems existing in desilication, dephosphorization and desulfurization process, and propose the corresponding solutions in order to solve these problems constraining process development and affecting the efficiency. Practice has proved that it is an effective way using green scientific solutions to restrain foam in desilication, prevent blocking guns in dephosphorization and deslagging in desulfurization process.

Abstract: Magnetic particle testing is based on the magnetic mark of magnetic particle formation on the workpiece surface by magnetic leakage field to reflect the characteristics of workpiece defects. The formation of magnetic leakage field, the impact factors and the distribution characteristics of different defects are discussed. The methods of magnetic mark record are elaborated. The magnetic marks related display characteristics of various types of defects caused, the magnetic marks unrelated display characteristics of the various types of non-defects caused, the pseudo display characteristics are analyzed in detail. Finally the recognition methods of magnetic mark display are given.

Abstract: In this paper, different amounts of fluoropropyl polyhedral oligomeric silsesquioxanes (FP-POSS) were incorporated into the poly (vinylidene fluoride) (PVDF) matrix by the solvent evaporation method. Influence of FP-POSS on morphology and mechanical properties of PVDF matrix was investigated. Good dispersion between FP-POSS and PVDF was achieved up to 8 wt% of nanofiller. The mechanical testing and dynamic mechanical analysis showed that low FP-POSS content induced a positive reinforcement effect on mechanical property in the formed composites. The results also indicated the existence of the optimal formula for producing POSS polymer composites, and POSS owning to its unique organic-inorganic structure can act as a plasticizer or as a reinforcing agent on the basis of interactions between filler and polymer.

Abstract: Computational modelling is the most important method in research for their low cost, high efficiency. A porous particulate composite material made of glass flam and phenolic coating was studied in the paper. The particle in the composite is glass foam but simplified as non-porous solid ball to reduce simulation cost. A series of the composite material model with ball size range of 0.5-2 mm diameters, different unit cell size, interface thickness and compression speed were simulated and analysed in the manuscript.

Abstract: The thermal degradation of phenolic formaldehyde resins (PF) were studied using thermo gravimetric analysis (TGA). The evolved volatiles during thermal degradation of PF were examined by mass spectrometry (MS). The structure changes of thermal degradation of synthetical phenolic resin (PF_1.2) and commercial resin (CPF) were investigated by solid-state ¹³C nuclear magnetic resonance (¹³C-NMR) techniques. The experimental results show that the degradation process of PF could be separated into three stages. In the first stage, ether bonds and unreacted terminal hydroxymethyl groups of the cured resin degraded. Methylene bridges decomposed into methyl groups then yielded both phenol and cresol homolog in the second stage. In the third stage, cyclodehydration and forming char of phenolic hydroxyl occurred. Our study showed that the main thermal degradation of PF in the second stage is the decomposition reaction of the methylene bridges instead of auto-oxidation of the methylene bridges reported in previous works.

Abstract: Quantitative metallographic analysis method is used to analysis ductile iron, carbon steel and copper those three typical metallic materials of power grid, instead of the situation for manual visual as qualitative and semi-quantitative. The results of experiment demonstrate that the quantitative metallographic analysis meets the requirements, and the merits are fast speed of processing, accurate and reliable data and reproducibility of experimental results.

Abstract: This paper studies on the effects of the heat treatment on cement. The results show that mixing the FGD gypsum which has been processed the heat treatment into the cement do has a certain influence on the cement, the strength of the cement is increased but the setting time is normal, and the rates of water loss and shrinkage of the hardened cement paste is significantly reduced, thus shrinkage cracks are effectively prevented.

Abstract: In this paper, using methyl red as polar probe, a containing LPS macromolecule emulsifier (HBS-1, MW is about 106Da) micellar aggregates in different polar medium (ethanol, n-butyl alcohol, ethylene glycol and DMF) structural properties, and provide a theoretical basis for the mechanism of the emulsified crude oil.

Abstract: To clarify the utilization of flue gas desulphurization (FGD) gypsum as the retarder of cementbased materials,the effect of the properties of the slag cement with different tempemtuIe treatment of FGD gypsum was studied. The results reveal that in the case of adding the same amount, the setting time of cement shortened with the increasing of heat treatment temperature of FGD gypsum. The influence of different heat treatment processes on the strength of cements was not obvious and the strength development was good. The water consumption of normal consistency for cements changed slightly. Stability was qualified.