Addition Of Iron Powder Research Articles

Microstructures of Microwave Heated Soda-Lime Glass - Fe Composite and Ni-Zr-Nb-Ti-Pt Metallic Glass

In this study, microwave (MW) heating of Fe powder in the separated electric (E-) and magnetic (H-) fields was performed first, and the heating behaviors on the field dependence were investigated. It was shown that they are heated better in H- field than in E- field. The MW heating mechanism of metals were briefly discussed. MW heating of soda-lime glass alone was not easy, however addition of iron powder enhanced the heating, depending on the volume fraction of the powder. Occurrence of deformation and melting of the glass spheres was observed. This technique is applicable to fabrication of glass-metal composites and vitrification of waste matters. MW heating of Ni-based metal glass was attempted with no external pressure and in an inert atmosphere, it was also shown that heating was better accomplished in H- field. Weakly sintered body was possibly obtained with retention of the amorphous phase.

Mineralisation of 2,4-dichlorophenoxyacetic acid by acoustic or hydrodynamic cavitation in conjunction with the advanced Fenton process

The mineralisation of 2,4-dichlorophenoxyacetic acid (2,4-D) in the presence of zero-valent iron and hydrogen peroxide (the advanced Fenton process – AFP) whilst being subjected to acoustic or hydrodynamic cavitation is reported. If the reaction is merely stirred then there is 57% removal of TOC whilst on irradiation the figure is 64% although the latter reaction is more rapid. Use of ultrasound alone results in only 11% TOC removal in 60min of treatment time. Addition of iron powder marginally enhances the extent of degradation but an appreciable increase is observed in the presence of hydrogen peroxide which acts as a source for hydroxyl radicals by Fenton chemistry as well as by dissociation in the presence of ultrasound. The use of hydrodynamic cavitation in conjunction with the advanced Fenton process has also been found to be a useful tool for continuous remediation of water contaminated with 2,4-D. After 20min of treatment the residual TOC is reduced to 30% and this probably represents the remaining highly recalcitrant small organic molecules.

Behaviour of molten metal and optimum welding conditions for high heat input submerged‐arc welding with flux containing iron powder

Summary The effect of the addition of iron powder to agglomerated flux on welding performance and the optimum welding conditions for high heat input welding were investigated. The main conclusions obtained are as follows: The addition of iron powder to flux increases the deposition rate and improves welding operability.The arc of the leading electrode was generated at a lower point in the molten metal, between the leading and the trailing electrodes, rather than at its top point. The penetration depth was influenced by the ratio of the area of the groove to that of the molten metal on which the leading arc is generated.The cross sectional profile of the bead was influenced by the current ratio of the trailing electrode to that of the leading. The optimum ratio for avoiding weld defects ranged between 0.70 and 0.80.The flux containing iron powder, together with the selection of optimum welding conditions, allowed tandem‐wire one‐pass submerged‐arc welding to be used for 60 mm thick plates.

Graft polymerization of acrylic acid onto silicone rubber film by preirradiation method

High percentage graft silicone rubber-g-acrylic acid via the preirradiation graft mathod was obtained by the addition of iron powder in the reaction medium

鉄粉添加フラックスを用いた大入熱サブマージアーク溶接の溶融池現象と適正溶接条件

The effect of the addition of iron powder to agglomerated flux on welding performance and the optimum welding conditions for high heat input welding were investigated. The main conclusions obtained follow :(1) The addition of iron powder to flux increases the deposition rate and improves welding operability.(2) The arc of leading electrode was generated at a lower point of molten metal between leading and trailing electrodes rather than at its top. The penetration depth was influenced by the ratio of the area of groove to that of molten metal on which leading arc is generated.(3) The cross sectional profile of the bead was influenced by the current ratio of the trailing electrode to that of the leading. The optimum ratio for avoiding weld defects ranged between 0.70 and 0.80.(4) The flux containing iron powder together with the selection of optimum welding conditions enabled the tandem wire one pass submerged arc welding for 60 mm thick plates.

Effect of Pressure Carbonization in Carbon/Carbon Composite Process (II)

ABSTRACTWe have found that pressurized carbonization cause the increase of carbon yield and the improvement of micro structure In the case of pitch resin. While the effects of pressurized carbonization on phenolic resin are not obvious.In this study, carbonization and graphitization characteristics of phenolic resin were investigated experimentally. Phenolic resin specimens with and without iron powder addition were carbonized at the temperature of 650 °C under the pressure of atmospheric or 100MPa. Then each of them was heat-treated at the temperature of 1200, 1500 and 1900 °C respectively. Measurement of yield, density, x-ray diffraction and optical observation were carried out in the experiments. It is indicated from those results that pressurized carbonization of phenolic resin makes graphite crystallization progress and this effect is promoted by addition of iron powder.

Fe粉添加によるCu焼結体の完全緻密化

Fe粉添加によるCu焼結体の完全緻密化

Optimum conditions for the liquid-phase sintering of parts from ground cast-iron swarf and iron powder

1. The addition of iron powder to ground cast-iron swarf widens the sintering temperature range of components. 2. The addition of up to 30% of ground cast-iron swarf to an iron-powder charge enables dense materials (of 0–4% porosity) to be produced exhibiting high mechanical properties. 3. A substantial increase in the hardness and mechanical properties of sintered parts produced from a mixture of castiron and iron powders can be obtained by additionally alloying the charge with 0.1–0.4% each of graphite and manganese.

オーステナイト系耐熱合金のクロマイズ処理法の検討

One of the most serious problems in gas turbines in which residual fuel oil is used would be the control of accelerated corrosion caused by fuel ash. In this paper, were studied chromium diffusion coating (chromizing) by powder method for austenitic heat resistant alloys used for gas turbine blades. The depth of chromium diffusion layer and surface chromium concentration of the layer were proved to be determined primarily by chemical compositions of the base alloy when the chromizing condition was fixed.When super alloys such as S590 or S816 that have low iron contents were chromized by a mixture of chromium powder, alumina powder, and ammonium chloride, the thickness of the layer was limited to a small value mainly because of low diffusion constant of chromium in these alloys.The maximum depth of the layer on S590 alloy obtained by powder method was 50 microns and surface chromium concentration was 84 wt per cent.Addition of iron powder in the above chromizing powder showed a considerable effect on the growth of diffusion layer. This effect can be explained by a pronounced increase of chromium diffusion constant caused by dilution of chromium concentration in the layer. Chromium concentration of the layer decreases almost linearly with addition of iron powder. When 8590 alloy was chromized with powder consisted of 20% chromium-10% iron-70% alumina, the surface chromium concentration of the layer was 60 per cent.