Advanced Materials Research Vols. 415-417

Abstract: The 5at.% Yb3+-doped YAG crystal was grown by the Czochraski method, and the crystal growth process was investigated. the optimal process parameters were determined as follows: The crystal growing rate for Shoulder growth and equal-diameter growth were 0.8mm/h and 1mm/h, respectively. The optimal Rotation speed of this crystal was 15rad/min, and the axial temperature gradient was 0.01−0.05°C/mm. The impact factors to crystal growth were analyzed theoretically, such as growth rate, rotation speed, thermal effect and crystal size.

Abstract: In this paper the Slab Caster Break-out Alarm ANN System is introduced, which has been developed with artificial intelligence and logic technique, knowledge of continuous casting expert system. The characteristics of the Slab Caster Break-out Alarm ANN System is that the breakout predict of the system is achieved with the logic breakout prediction module and BP neural network breakout module; The predicting results of the two methods are inputted into the expert system decision module, this module can provide the last predicting results. This would increase the prediction accuracy, and improve the process of slab continuous casting.

Abstract: The blends of poly(trimethylene terephthalate) (PTT) with maleated styrene-butylene-co-ethylene-styrene copolymer (SEBS-g-MA) were prepared by melt blending. Their morphologies and crystallization behavior were investigated. Morphology observation shows the well-dispersed phase of SEBS-g-MA in PTT matrix and the partical size of SEBS-g-MA increased as the content of SEBS-g-MA increasing. Differential scanning colorimetry(DSC) experiments showed that the melting point of pure PTT and their blends was almost constant. Addition of 5-30wt% SEBS-g-MA in blends increased crystallization points of PTT phase and the crystallinity of the blends were higher than that of PTT.

Abstract: The densification process is the key step in the producing of the high density graphite materials. This paper depend on the DSC-TGA analysis of the green petroleum coke to explore the roasting curve. The impregnating process parameters were optimized through orthogonal experimental design. Results show that the green petroleum coke polymerization severe between 200 to 600°C, the coking of volatile has basically completed and the system start densification in 600-850°C.Keeping Nitrogen pressure 1.5Mpa and impregnation temperature 200°Cfor 60min are the first optimization process parameters of impregnation.

Abstract: The B₄C/BN composites were fabricated by hot-pressing process in this research. The B₄C/BN composites included the B₄C/BN microcomposites and the B₄C/BN nanocomposites. The B₄C/BN microcomposites were fabricated by hot-pressing process, and the B₄C/BN nanocomposites were fabricated by chemical reaction and hot-pressing process. In this research, the phase composition, microstructure, mechanical property and machinability of the B₄C/BN microcomposites and B₄C/BN nanocomposites were investigated. The XRD patterns results showed that there existed B₄C phase and h-BN phase in the hot-pressed composites. The microstructure of the B₄C/BN composites was investigated by SEM and TEM. The B₄C/BN microcomposites and the B₄C/BN nanocomposites sintered bulks exhibited the homogenous and compact microstructure, and the h-BN particles were homogenously distributed in the B₄C matrix. The mechanical property of the B₄C/BN microcomposites and the B₄C/BN nanocomposites decreased gradually with the increase of h-BN content. The mechanical property of the B₄C/BN nanocomposites was remarkably improved in comparison with the B₄C/BN microcomposites. The machinability of the B₄C/BN microcomposites and the B₄C/BN nanocomposites increased gradually with the increase of h-BN content, the drilling rates of the B₄C/BN composites specimens increased gradually with the increase of h-BN content. The relationship between the microstructure and machinability of the B₄C/BN composites was analyzed. The microstructure showed that the weak interface of B₄C/BN and cleavage behavior of laminate structured h-BN particles remarkably improved the machinabilty of B₄C/BN composites.

Abstract: This article establish the physical and mathematic model of the plastic housing of the ND-5 internal combustion tamping pickax by plastic molding CAE, analyse the flow field in injection molding. We simulate many programs of the injection molding processing , analyze the mold-filling characteristic of the programs, study the defect situation and select the best injection molding program for the moulding.

Abstract: The characteristics of grouting material for blast furnace lining crack repair were briefly introduced in this paper. The influences of matrix aggregates particle size grades on the properties of grouting materials for blast furnace lining crack repair were mainly discussed. Based on series of tests and experiments, the optimized matrix aggregates particle size grades were confirmed.

Abstract: Current failure theories for predicting failure in composite laminates have been studied and compared in a systematic and detailed manner, to identify the strengths and weaknesses of each theory, together with a ranking of the overall effectiveness of each theory. Careful reading of this analysis and study of figures provided will inform the reader when selecting an appropriate failure theory for use in a given design situation. It will also provide a qualitative assessment of the likely accuracy and reliability of the prediction in a given circumstance.

Abstract: Experimental study was carried out with TiO₂ Nano-sized compounds coated on aluminum foil to study the cleaning properties and heat transfer effect. The experiments were also carried out for air conditioners which fins of evaporator and condenser were coated with TiO₂ nano compound coating. Results show that the foils with TiO₂ nano compound coating presents better self-cleaning property and improved heat transfer effect. Air conditioner’s properties with TiO₂ nano compound coating evaporator and condenser is higher than that without coating. The maximum heat capacity was found to be increased 8%. The nano-sized liquid showed better synthetic function such as excellent hydrophilic, better cohesion, water flushing resistance.

Abstract: Synthesis and properties of epoxy resin/graphite composites via in situ condensation polymerization of monomers in the presence of graphite particles were investigated. The results showed graphite particles were well dispersed in the epoxy resin matrix. Shore hardness and bending strength varied with the amount of graphite, and they were all improved greatly by an optimal content of 17.44 % (mass fraction). The bending strength was 22.4MPa and Shore hardness was 9.8 HD. A plastic deformation can be seen in the composite with the range of strain 0.6-0.8%. The fitted yield strength is about 20MPa.