Abstract: Three kinds of dimensional simplified models were established according to the structure properties of interpenetrating network composites. The cutting process of INC with different structure parameters were calculated by finite element method. The random properties of cutting forces were also analyzed. It is shown that cutting forces would increase when reinforced phase is cut. Micro cracks are liable to be caused on interfaces between two phases. The structure parameters d、α、β have great effects on cutting forces and cause random fluctuation which cause random properties for INC cutting process.
Abstract: Aluminum pigments were encapsulated by hydrolysis and condensation of tetraethoxysilane (TEOS) and methyltriethoxysilane (MTES). The influences of solvents and ratio of MTES/TEOS on corrosion inhibition performance were studied. The FTIR, XPS and SEM analysis showed that both TEOS and MTES hydrolyzed and condensed at the same time to form a compact and thin sol-gel layer on the surface of aluminum pigments. Aluminum pigments encapsulated by MTES and TEOS, which can hardly generate H2 in acid media of pH=1 within 12h, show greatly excellent corrosion resistance than that only by TEOS or by MTES, due to the formation of a compact and thin hybrid film to protect aluminum particles from corrosive media.
Abstract: In order to improve the understanding deformation behaviors of thermal compressive of ZK30 magnesium alloy, carried out a series of thermal compressive tests with height reduction 60% of specimens were performed at deformation temperature range of 523-673 K, and strain rates range of 0.001-1 s−1 on Gleeble-1500 thermo-mechanical simulator. Based on an Arrhenius-type equation constructs a nonlinear flow model and its constitutive equation, are employed to study the deformation behavior and the relationship between deformation temperature, strain rate and flow stress. For higher deformation temperature and lower strain rate, the true stress-strain curves show a characteristic of dynamic recrystallization. With the increase of deformation temperature and the decrease of strain rate the flow stress decreases, also the dynamic recrystallization becomes easier.
Abstract: In this paper, the stiffness and folding endurance of the paper were investigated with three kinds of pulp, such as the mechanical wood pulp, chemical pulp and composite pulp, after using common additives and cleaning additives. The results indicated that the stiffness of the paper can be increased by 20% ~ 30% and folding endurance can improve 20% ~ 60% after using new kind of cleaning additives no matter what kind of filler. New cleaning additives can not only improve the physical properties of paper, but also change "acidic papermaking" of the traditional paper industry into clean neutral papermaking environment. Especially, it is suitable for the production of food card paper.
Abstract: The sintering temperature of 8YSZ (8mol% yttrium stabilized zirconia) is very high, usually above 1500°C. BAS (BaO-Al2O3-SiO2) microcrystalline glass can be used as sintering aids to reduce the sintering temperature of 8YSZ. In this research, large proportion (30-50wt%) BAS was added in 8YSZ to observe the influence of the sintering aids. The change rules of mechanical properties such as density test, bending strength and toughness in different material component and sintering process were researched. The results show that physical and mechanical performance improvement with the increase of sintering temperature and sintering time, density and bending strength decreases with the increase of BAS mass fraction. The optimal mechanical properties are obtained by sintering temperature 1300°C, sintering time 0.5h and 30wt% BAS.
Abstract: The compression and energy absorption characteristic of polyimide foams with three different densities were analyzed in this paper. The compression properties were characterized by CMT7104 Electronic Universal Testing Machine, and the results show that the compressive stress at the same compressive strain increases with the foam density, and the stress-strain curves of polyimide foams with different densities were all composed of elastic region, plateau region and compacted region. The foams ideal energy-absorption efficiency curves were obtained from their stress-strain curves, and all findings show that stress corresponding to at the peak of the energy-absorption efficiency was closed to the compaction stress of material, all their ideal energy-absorption efficiency can reach about 0.8. The polyimide foam is a kind of excellent energy-absorption material.
Abstract: The copper nanoparticle at castor oil coated graphite-epoxy solid electrode soft intersurface was studied by cyclic voltammetry. The growth process follows a sphere particle growth process described by an exponential function with parent first order rate constant of 0.00341 s-1. The soft water-immiscible electrode surface tends to produce spherical particles. This study may be useful for the electroanalysis, and offers a new way to prepare a spherical nanometal particle.
Abstract: The solubility and absorption rate of CO2 in piperazine (PZ) promoted potassium carbonate (K2CO3) aqueous solution were measured at 1 atm. The temperatures ranged from 328.15 to 343.15K. The mass fractions of K2CO3 (w1) and PZ (w2) respectively ranged from 0.2 to 0.25, and 0 to 0.05. The influence of the mass fractions of PZ on the solubility, CO2 loading and absorption rate was illustrated.
Abstract: Each component ratio of the ternary composite retarder was determined through orthogonal test and the effect of the ternary composite retarder on physical properties of FGD gypsum plaster material was studied. The results show that when the dosage of citric acid, admixture 1, admixture 2 were 0.05%, 0.4% and 0.3% respectively in the ternary composite retarder, the FGD gypsum plaster material had the best physical properties. The initial setting time was 118min and the final setting time was 132min respectively. The flexural and compressive strength were 3.15MPa and 6.46MPa, respectively. The microstructure of FGD gypsum hydration products was analyzed by SEM and the action mechanism of the ternary composite retarder was analyzed.