Effect Of Aluminum Powder Research Articles

Effect of Aluminium Powder on Kaolin-Based Geopolymer Characteristic and Removal of Cu2.

This current work focuses on the synthesis of geopolymer-based adsorbent which uses kaolin as a source material, mixed with alkali solution consisting of 10 M NaOH and Na2SiO3 as well as aluminium powder as a foaming agent. The experimental range for the aluminium powder was between 0.6, 0.8, 1.0 and 1.2wt%. The structure, properties and characterization of the geopolymer were examined using X-Ray Diffraction (XRD), Infrared Spectroscopy (FTIR) and Scanning Electron Microscopy (SEM). Adsorption capacity and porosity were analysed based on various percentages of aluminium powder added. The results indicate that the use of aluminium powder exhibited a better pore size distribution and higher porosity, suggesting a better heavy metal removal. The maximum adsorption capacity of Cu2+ approached approximately 98%. The findings indicate that 0.8% aluminium powder was the optimal aluminium powder content for geopolymer adsorbent. The removal efficiency was affected by pH, adsorbent dosage and contact time. The optimum removal capacity of Cu2+ was obtained at pH 6 with 1.5 g geopolymer adsorbent and 4 h contact time. Therefore, it can be concluded that the increase in porosity increases the adsorption of Cu2+.

Effect of Aluminum Powder on Underwater Explosion Performance of CL‐20 Based Explosives

AbstractThe influences of particle size distributions of the nano and micro‐aluminum powders on the underwater explosion were analyzed experimentally. Both shock waves and the second pressure pulses induced by the CL‐20 based explosives were measured. Furthermore, the shock wave energy, the bubble energy, the reacting quantity of aluminum powders in the CL‐20 based explosives during the detonation and secondary reaction processes were calculated. The results indicate that: the nano‐aluminum powders have significant influences on both the detonation reaction and the secondary reaction, leading to the higher peak pressure of the shock wave while the lower peak pressure and narrower pulse width of the secondary pressure pulse; the gradations of both nano and micro‐aluminum powders improve the energy outputs of the explosives; the nano‐aluminum powders enhance the shock wave pressure while the micro‐aluminum powders maintain higher bubble energy.

Effect of Aluminium Powder on Light-weight Aerated Concrete Properties

Light-weight aerated concrete (LAC) is produced by making LAC involves the addition of a gas-forming admixture like aluminium powder (AP) to a wet mortar mixture. In concrete during curing, AP will react with the calcium hydroxide in the mixture to form hydrogen. The amount of gas-forming is dependent on the mechanical properties requirements. The aim of the current work was to investigate the properties of aerated concrete (AC) containing 30% fly ash and various AP content, including dry density, porosity and modulus of elasticity, as well as strengths of test specimens. The results of this study showed that when AP content increased, the density of AC decreased, but its porosity increased. Whereas an increase in the amount of AP caused a decrease in both the compressive strength, tensile strength and the modulus of elasticity of ACspecimens. The investigation of newly modified AC through combination of local by-product in Vietnam would decrease the content of Portland cement was used and as well as reduce the amounts of ash and slag TPP as well as industrial waste thrown at a landfill. Therefore, assisting the thermoelectric power plants to be more environmentally friendly in the future.

Effect of aluminum powder and NaOH on the physical and mechanical properties of aerated block with desulfurized gypsum

ABSTRACTIn China, the desulfurization problem of power plants has been paid much attention by the government and the public. From 2014 to present, the nearly one hundred million tons of desulfurized gypsum has been discharged. The utilization rate of desulfurized gypsum in power plants has also become the focus of current research. The purpose of this study is to study the influence of aluminum powder and NaOH on the physical and mechanical properties of desulfurized gypsum aerated block(DGAB). The testing results show that when the optimized formula is 5% high-alumina cement, 0.7% aluminum powder, 0.5% NaOH, 0.6 water-cement ratio and the producing gas temperature is 40°C, the physical and mechanical properties of DGAB can reach the bulk density of 309.3 kg/m3, the strength of 0.24 MPa, and the thermal conductivity of 0.073 W/(m·K). The microscopic analysis showed that when the amount of aluminum powder was 0.7%, the porosity of DGAB was minimum, its pore size was uniform and smaller than 1 mm, and the insulation effect was better. At this time, the strength of DGAB can reach the highest value and the thermal conductivity of DGAB is lower.

Study on Effect of Aluminum Powder in CA (Cement Asphalt) Mortar

CA mortar is using the domestic with river sand as aggregate currently in China, we use sand to replace river sand as fine aggregate in CA mortar. The main purpose is test the influence of dosage on aluminum in the CA mortar. Experiments show that dosage should be the best aluminum from 0.01% to 0.015 %.

Effect of Aluminum Powder on the Luminous Intensity of an Illuminant

The particle diameter and luminous intensity of aluminum powder were measured by laser analyzer and photo-effect tester. The luminous intensity of [Ba(NO3)2＋Al] illuminant were studied for different shape and diameter of aluminum powder as well as ultra-fine powder prepared by chemical method. The results show that the luminous intensity increases with particle size reduced, and luminous intensity of non-spherical aluminum is more than that of spherical aluminum. The change rate of luminous intensity increases rapidly when particle diameter was less than 2μm. It’s change rate in [0.6，2.13] is 4.37 times that in [2.13，4.24] interval.The ultra-fine aluminum powder and the submicron aluminum powder can effectively enhance the luminous performance of pyrotechnics.

Effect of adhesion on the equilibrium swelling of natural rubber-aluminium powder composites

Equilibrium swelling of natural rubber composites containing aluminium powder has been investigated in a series of aromatic hydrocarbon solvents, such as benzene, toluene, xylene, and mesitylene. These composites were vulcanized by four vulcanizing systems, viz. conventional, efficient, dicumyl peroxide, and a mixture, consisting of sulfur and dicumyl peroxide. In each system, the effect of aluminium powder with and without bonding agent was studied. The results showed that addition of bonding agent reduced the swelling considerably, and its effect is more pronounced in the conventional system due to increased adhesion. The dependence of the diffusion coefficient on the crosslinking system and the solvent–polymer interaction parameter were calculated from diffusion data. These results are also indicative of the improved adhesion with hexa-resorcinol–silica bonding system in these composites. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 70: 2427–2438, 1998

Particulate damping in solid-propellant combustion instability.

The effect of aluminum powder in damping high-frequency solid-propellant instability has been investigated in a vortex burner developed previously. The combustor was composed of a main chamber having a shallow center-perforated grain and a hot gas generator. The generator fed combustion gases tangentially into the main chamber causing transverse mode combustion instability. Aluminum powder was added either to the main propellant or to the gas generator charge. Measurement of the amplitude of the pressure oscillations indicated the effectiveness of the metal acting 1) as an ingredient at the solid surface and in the gas phase and 2) in the gas phase only. In the absence of aluminum the combustor was unstable, exhibiting an oscillation frequency of ^3800 cps with a peak-to-peak amplitude of 55%. The addition of fine aluminum powder to the propellant in the main chamber was sufficient to damp out the high-frequency instability. Addition of aluminum to the gas generator propellant only was also effective in eliminating instability provided that an equivalent concentration of metal particles was added. It was concluded that the addition of aluminum powder to composite solid propellants suppresses instability by acting as an attenuator of sound in the gas phase rather than altering the driving or response of the propellants. Viscous damping is inferred to be the principal damping mechanism. Addition of the aluminum produced a nonacoustic disturbance which appeared to be eliminated at higher operating pressures.

The Effect of Aluminum Powder on the Heat Insulation of Goose Down

The effect on the thermal insulation value of goose down was examined when dif ferent amounts of aluminum powder were added by dusting. At low density considerable improvement was found to be possible.