scholarly journals Influence of rolling scale processing parameters on morphology of reduced iron powder particles

2016 ◽  
Vol 6 (1(32)) ◽  
pp. 4-8
Author(s):  
Александр Александрович Внуков ◽  
Артем Николаевич Головачев ◽  
Алена Викторовна Белая
Keyword(s):  
Iron Powder ◽  
Processing Parameters ◽  
Rolling Scale ◽  
Powder Particles ◽  
Reduced Iron Powder

Analysis of the Influence Factors on High Compressibility Water Atomized Iron Powder

2016 ◽  
Vol 859 ◽  
pp. 118-124
Author(s):  
Guo Ping Li ◽  
Li Bo Guo ◽  
Li Hui Sun ◽  
Feng Hua Luo ◽  
Jiao Du ◽  
...  
Keyword(s):  
Particle Size ◽  
Iron Powder ◽  
Oxygen Content ◽  
Fine Particles ◽  
Influence Factors ◽  
Impurity Content ◽  
Processing Parameters ◽  
Coarse Particles ◽  
Green Density ◽  
Powder Particles

In this paper, the influence factors on high compressibility water atomized iron powder LAP100.29 were studied such as the processing parameters, the proportion of coarse particles, powder oxygen content and impurity. The results showed that, by increasing the purity of molten steel and improving atomization temperature, the iron content of water atomized iron powder particles reached more than 99.67 %, the oxygen content was less than 0.08 %, acid insoluble was less than 0.08 %, green density reached 7.21~7.22 g/cm3. The contents of +80 and -80～+100 mesh powder were 1.6 % and 7.5 %, respectively. The compressibility could be improved by the increase of the coarse particles and the reduction of the fine particles (for example, lowering the content of -325 mesh particles). Generally speaking, the compressibility of the water atomized iron powder can be improved fundamentally by reducing oxygen content, impurity content and the reasonable distribution of particle size.

scholarly journals Effect of Lubricant on Warm Compaction Behavior of Iron Powder Particles.

2000 ◽  
Vol 47 (9) ◽  
pp. 941-945 ◽  
Author(s):  
Katsuyoshi Kondoh ◽  
Takatoshi Takikawa ◽  
Ryuzo Watanabe
Keyword(s):  
Iron Powder ◽  
Warm Compaction ◽  
Compaction Behavior ◽  
Powder Particles

Limit of Dislocation Density and Dislocation Strengthening in Iron

2006 ◽  
Vol 503-504 ◽  
pp. 627-632 ◽  
Author(s):  
Koichi Nakashima ◽  
M. Suzuki ◽  
Y. Futamura ◽  
Toshihiro Tsuchiyama ◽  
Setsuo Takaki
Keyword(s):  
Dislocation Density ◽  
Iron Powder ◽  
Vickers Hardness ◽  
Mechanical Milling ◽  
The Other ◽  
Proof Stress ◽  
Density Region ◽  
Powder Particles ◽  
Cold Rolled ◽  
Dislocation Strengthening

The limit of dislocation density was investigated by means of mechanical milling (MM) treatment of an iron powder. Mechanical milling enabled an ultimate severe deformation of iron powder particles and dislocation density in the MM iron powder showed the clear saturation at around the value of 1016m-2. On the other hand, the relation between hardness and dislocation density was examined in cold-rolled iron sheets, and the linear Bailey-Hirsch relationship; HV[GPa]=0.7+3×10-8ρ1/2 was obtained in the dislocation density region up to 3×1015m-2. Extrapolation of the Bailey-Hirsch relationship indicated that the dislocation strengthening should be limited to about 3.7GPa in Vickers hardness which corresponds to about 1.1GPa in 0.2% proof stress.

scholarly journals Improving Powder Magnetic Core Properties via Application of Thin, Insulating Silica-Nanosheet Layers on Iron Powder Particles

Nanomaterials ◽  
2016 ◽  
Vol 7 (1) ◽  
pp. 1 ◽  
Author(s):  
Toshitaka Ishizaki ◽  
Hideyuki Nakano ◽  
Shin Tajima ◽  
Naoko Takahashi
Keyword(s):  
Iron Powder ◽  
Magnetic Core ◽  
Powder Particles

Copper Coated Iron Powder Prepared by Chemical Reduction Process

2011 ◽  
Vol 275 ◽  
pp. 161-164
Author(s):  
Xiao Yun Zhu ◽  
Zhong Cheng Guo
Keyword(s):  
Iron Powder ◽  
Chemical Reduction ◽  
Reduction Process ◽  
Raw Material ◽  
Solution Temperature ◽  
X Ray Diffraction ◽  
Powder Surface ◽  
X Ray ◽  
Reduced Iron Powder ◽  
Plating Solution

Using reduced iron powder as raw material, Copper coated iron powder(CCIP) is prepared by electroless alkaline-based plating. We discuss the impacts of reductant concentration, plating solution temperature and main salt concentration on the properties of CCIP. Surface morphology and composition are studied by using scanning electron microscopy and X-ray diffraction. The results show that after coating, the iron powder surface is rougher and the copper layer is uniform in its simple metallic form without any oxide states.

Spheroidization of iron powder in a microwave and hybrid plasma torches

2019 ◽  
pp. 4-12
Author(s):  
S. A. Eremin ◽  
V. N. Anikin ◽  
D. V. Kuznetsov ◽  
I. A. Leontiev ◽  
Yu. D. Stepanov ◽  
...  
Keyword(s):  
Iron Powder ◽  
Plasma Temperature ◽  
Linear Increase ◽  
Porous Iron ◽  
Particle Structure ◽  
Final Size ◽  
Plasma Torches ◽  
Dc Discharge ◽  
Hybrid Plasma ◽  
Powder Particles

The process of porous iron powder spheroidization in microwave discharge and combined microwave and DC discharge modes in nitrogen and helium plasma was studied with powder particle sizes ranging from 45 to 85 μm. The powder was obtained by air spraying and subsequent hydrogen annealing. Plasma spraying produced hollow spheroidized particles with a wall thickness from 1 to 10 μm. The share of spheroidized powder particles in their total volume was determined. It was found that microwave power rising from 1.5 to 5 kW leads to a linear increase in the spheroidization degree of iron powder particles. When working in the hybrid plasmatron mode, microwave radiation conditions are combined with a DC discharge and make it possible to increase the plasma temperature. When the ratio of microwave and DC discharge power is 1 : 1, virtually 100 % iron powder spheroidization is obtained. The metallographic study of spheroidized particles showed that their final size differs from the initial one by about 10 times. It was found that iron powder oxidation occurs regardless of the spheroidization mode. This is due to the insufficient purification degree of plasma gases. The structure of particle surfaces when using nitrogen or helium as a plasma gas is different. Experiments showed that the use of helium is more preferable, since the particles have only a slight roughness in comparison with the particle structure during nitrogen spheroidization.

Optimization of Plasma Spray Processing Parameters for Deposition of Nanostructured Powders for Coating Formation

2006 ◽  
Vol 128 (2) ◽  
pp. 394-401 ◽  
Author(s):  
I. Ahmed ◽  
T. L. Bergman
Keyword(s):  
Thermal Spray ◽  
Liquid Fraction ◽  
Processing Parameters ◽  
Processing Parameter ◽  
Molten Material ◽  
Spray Coatings ◽  
Coating Formation ◽  
Powder Particles ◽  
Spray Processing ◽  
Change Response

When nanostructured powder particles are used for thermal spray coatings, the retention of the original nanostructure that is engineered into the raw stock is a principal objective, along with production of some molten material in order to adhere the sprayed material to the surface being coated. Therefore, in contrast with spraying conventional powders, complete melting of the nanostructured raw stock is to be avoided. In this study, the melting and resolidification of sprayed material is correlated to a spray processing parameter that has been introduced in the literature by some of the spray processing practitioners. Using computer modeling, processing of zirconia agglomerates with plasma spraying has been simulated. Transition regions for the phase change response of the sprayed material to the thermal processing conditions are identified. The retained nanostructure content and liquid fraction of the sprayed material are correlated to particle diameters, injection velocities, as well as this thermal spray processing parameter. Finally, a novel method to produce desired coatings composed of partially molten material using a bimodal particle size distribution of the sprayed powder is suggested.

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