Showing 01 - 12 of 139 Results

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Nanocrystalline Fe–C alloys produced by ball milling of

Single nanocrystalline ferrite structures are observed after ball milling of iron and graphite at low carbon concentrations, whereas at higher concentrations the nanostructures consist of ferrite and Fe 3 C. At the highest carbon content of 19.40 at.% C a mixture of ferrite, Fe 3 C and an amorphous phase is found. The stone size of ferrite

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Microstructure characterization and cation distribution of

Sep 15, 2005· Nanocrystalline Mg-ferrite was prepared by high-energy ball milling of stoichiometric mixture of MgO and α-Fe 2 O 3 powders. The starting material and the products at different stages of the milling process were characterized by Rietveld analysis of the X-ray powder diffraction patterns.

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Ferrite Ball Milling Fe Powder ferienwohnung-rhoenantik.de

Learn more about ball mill equipment. Effect Of Milling Atmosphere On Structural And. can take place within only 30 min of ball milling with homogeneous stoichiometric 11 mole powder mixture of Fe 2O 3 and ZnO phases When the milling time goes up to 18 h the peaks move to the same Bragg diffraction position of NiZn ferrite This suggests the likely formation of the ferrite As the

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Effect of High-Energy Ball Milling on the Magnetic

High-density fine-grained Ni 0.5 Zn 0.5 Fe 2 O 4 ferrite ceramics were synthesized by spark plasma sintering (SPS) in conjunction with high energy ball milling. The precursor powders were milled for 20 h, 40 h, and 60 h, respectively, and the milled powders were all sintered for 5 min at 900˚C.

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Preparation and microwave absorbing properties in the X

magnetic separator. The natural ferrite microparticles were synthesized by high energy ball milling in a Restch planetary ball mill with tungsten carbide balls and jars. A ball-to-powder ratio of 20:1, a milling rotation speed of 200 rpm and a milling time of 2, 4, and 6 h were used in the experiments. The choice of ball-to-powder ratio

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Magnetic properties of ball-milled SrFe12O19 particles

The room-temperature magnetic properties of ball-milled strontium hexaferrite particles consolidated by spark-plasma sintering are strongly influenced by the milling time. Scanning electron microscopy revealed the ball-milled SrFe 12 O 19 particles to have sizes varying over several hundred nanometers. X-Ray powder-diffraction studies performed

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Structural and Magnetic Properties of Nickel Ferrite

Structural and Magnetic Properties of Nickel Ferrite Nanoparticles Synthesized by Ball Milling ijesi.org 38 Page FT-IR spectra for the milled nickel ferrite nanoparticles are recorded in the range 400 4000 cm-1 shown in the Fig 4.

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Microstructure characterization and cation distribution of

Microstructure characterization and cation distribution of nanocrystalline magnesium ferrite prepared by ball milling S.K. Pradhana,b,∗,S.Bidb, M. Gateshkia, V. Petkova a Department of Physics, 203, Dow Science, Central Michigan University, MI 48859, USA b Department of Physics, The University of Burdwan, Golapbag, Burdwan 713104, West Bengal

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Microstructure characterization and phase transformation

Sep 15, 2007· Analysis of ball-milled samples reveals that the inverse spinel phase content started to reduce in relatively long milling time and disappeared completely within 20 h milling time. After 25 h of milling, ball-milled powder mixture contain normal phase of Mg–Zn-ferrite with a trace amount of α-Fe

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Structure and magnetic properties of NiZn ferrite/SiO2

In this work NiZn-ferrite/silica nanocomposites are obtained by ball-milling a mixture of crystalline of α-Fe 2 O 3, NiO, ZnO and SiO 2 powders. The main effect of grinding is the apparition of various phases at different stages of milling, such as NiZn-ferrite, α-Fe and Fe 2 SiO 4 (fayalite) and a long term powder

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Effect of High-Energy Ball Milling on the Magnetic

S. Gao et al. 52 Figure 2. (a) The densities of the Ni 0.5Zn 0.5Fe 2O 4 ceramic samples prepared by SPS after high-energy ball milling for 20 h, 40 h, and 60 h (Dth = theoretical value); (b) The corresponding XRD patterns. milling is an effective method of preparing the precursor powders in order to produce highdensity ceramics.

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Fabrication, structure and magnetic properties of

Nanocrystalline NiZn-ferrite was fabricated by a high-energy milling method with Fe 3 O 4 +NiO+ZnO. The structure and magnetic properties of the milled powder were measured and analyzed.

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The influence of reagents ball milling on the lithium

In this work, the effect of ball milling of Li 2 CO 3 and Fe 2 O 3 reagents on the Li 0.5 Fe 2.5 O 4 ferrite formation was studied by thermogravimetric and differential scanning calorimetric measurements using non-isothermal heating and cooling modes.

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Milling Services: Jet, Ball & Attrition Milling Steward

Steward Advanced Materials has developed expertise in milling materials as a result of our history in being one of the major suppliers of ferrite powder to the consumer electronics and reprographic industries. Our extensive in-house materials characterization capability, and grinding/sizing expertise set us apart from our competition.

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Structural, magnetic and electrical properties of the

The physical properties of ferrites are very sensitive to microstructure, which in turn critically depends on the manufacturing process. Lithium ferrite is synthesized by milling process. The powder was annealed at four different temperatures 600, 800, 1,000 and 1,200 °C. The powder annealed at 600 °C has the spinel structure with some of α-Fe2O3, while the powders annealed at ≥800 °C

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PAPER OPEN ACCESS Effect of Particle Size on Maximum

Abstract. Ferrite is an important component for electric motors, loud-speakers, EMI suppressors and transformer core. Hematite (Fe2O3) and strontium carbonate are commonly used to prepare ferrite. In this work, waste-derived hematite powder was milled using ball mill, high-energy milling and high-energy blender and the powder size was observed.

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NiZn ferrite/Fe hybrid epoxy-based composites: extending

NiZn ferrite/Fe hybrid epoxy-based composites: extending magnetic properties to high frequency 4 ferrite powder and Fe particles in an NiZn ferrite/38 vol% Fe powder mixture after ball

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Structure and magnetic properties of strontium ferrite

Structure and magnetic properties of strontium ferrite anisotropic powder with nanocrystalline structure Article (PDF Available) in Journal of Alloys and Compounds 509(3):1065-1068 · January 2011

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High-energy grinding of FeMo powders Journal of

Jan 31, 2011· Application of back-propagation neural network technique to high-energy planetary ball milling process for On the reliability of powder diffraction Line Profile Formation mechanism and annealing behavior of nanocrystalline ferrite in pure Fe fabricated by ball milling. ISIJ Int. 41, 1389 2001. 19 Xu, Y., Liu, Z.G., Umemoto, M

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Comparison of structure and magnetic properties of Mn–Zn

Oct 10, 2015· Nanocrystalline Mn 0.5 Zn 0.5 Fe 2 O 4 ferrite was successfully synthesized by ball milling a powder mixture of MnO, ZnO, and Fe 2 O 3 under argon and oxygen atmospheres. The effects of the milling time, milling atmosphere, and annealing temperature on the milled powders were examined. X-ray diffractometry (XRD), scanning electron microscopy, and transmission electron

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The Manufacture Process of Ferrite Magnets

The flow chart of ferrite magnets. Weighing & Mixing. The raw material of ferrite includes main raw material, additives and flux agents. Fe 2 O 3, BaCO 3, The crushing process will be finished by ball mill equipment. The milling medium is steel ball and water. Moulding.

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Effect of High-Energy Ball Milling on the Magnetic

High-density fine-grained Ni 0.5 Zn 0.5 Fe 2 O 4 ferrite ceramics were synthesized by spark plasma sintering (SPS) in conjunction with high energy ball milling. The precursor powders were milled for 20 h, 40 h, and 60 h, respectively, and the milled powders were all sintered for 5 min at 900 ° C. All the samples exhibit a single spinel phase.

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The influence of reagents ball milling on the lithium

May 13, 2019· In this work, the effect of ball milling of Li 2 CO 3 and Fe 2 O 3 reagents on the Li 0.5 Fe 2.5 O 4 ferrite formation was studied by thermogravimetric and differential scanning calorimetric measurements using non-isothermal heating and cooling modes. In the latter case, the analysis was carried out with a magnetic field applied in order to estimate the Curie temperature of the synthesized

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Ball-milling of Fe–Zn intermetallics Journal of

The ball-milling of pure Fe and Zn elemental powders corresponding to the Г-(Fe 3 Zn 10), Г 1-(Fe 5 Zn 21), δ-(FeZn 7), and ζ-(FeZn 13) compositions yields metastable crystalline phases. This is demonstrated by the peaks observed in the DSC measurements of the different phases.

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The Manufacture Process of Ferrite Magnets

The raw material of ferrite includes main raw material, additives and flux agents. Fe 2 O 3, BaCO 3, SrCO 3 and CaCO 3 are main raw material of ferrite. The weighing process need to follow the formula strictly, or cannot get the desirable magnetic properties.

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Effect of High-Energy Ball Milling on the Magnetic

High-density fine-grained Ni 0.5 Zn 0.5 Fe 2 O 4 ferrite ceramics were synthesized by spark plasma sintering (SPS) in conjunction with high energy ball milling. The precursor powders were milled for 20 h, 40 h, and 60 h, respectively, and the milled powders were all sintered for 5 min at 900 ° C. All the samples exhibit a single spinel phase.

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The influence of reagents ball milling on the lithium

May 13, 2019· In this work, the effect of ball milling of Li 2 CO 3 and Fe 2 O 3 reagents on the Li 0.5 Fe 2.5 O 4 ferrite formation was studied by thermogravimetric and differential scanning calorimetric measurements using non-isothermal heating and cooling modes. In the latter case, the analysis was carried out with a magnetic field applied in order to estimate the Curie temperature of the synthesized

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Ball-milling of Fe–Zn intermetallics Journal of

The ball-milling of pure Fe and Zn elemental powders corresponding to the Г-(Fe 3 Zn 10), Г 1-(Fe 5 Zn 21), δ-(FeZn 7), and ζ-(FeZn 13) compositions yields metastable crystalline phases. This is demonstrated by the peaks observed in the DSC measurements of the different phases.

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Magnetic properties of ball-milled SrFe 12 O 19 particles

Sep 15, 2015· The room-temperature magnetic properties of ball-milled strontium hexaferrite particles consolidated by spark-plasma sintering are strongly influenced by the milling time. Scanning electron

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Magnetic properties of Zn-Sn-substituted Ba-ferrite

Magnetic properties of Zn-Sn-substituted Ba-ferrite powders prepared by ball milling of barium ferrite powders with Fe/Ba ratios varying from 7 to 15 and heat-treated in the temperature range

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(PDF) NiZn ferrite/Fe hybrid epoxy-based composites

By combining the characteristics of high resonant frequency of the Fe and low energy losses of the ferrite, an optimum mixture of ball-milled 15 vol% NiZn ferrite and 38 vol% Fe in a hybrid epoxy

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Formation and Surface Structure of Ti-Zn-Double Oxides and

thesis to zinc ferrite of ZnO—Fe 2 03 powder mixtures was carried out in a planetary ball mill AGO 2 (Insti­ tute of Solid State Chemistry, Novosibirsk). A stain­ less steel vial (150 cm3 in volume) and balls of 5 mm in diameter were used. The ball-to-powder mass ratio was 20:1. The milling was done in air.

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Comparison of the Characteristics of Nanocrystalline

The nanocrystallization rate of pearlite powder is faster than that of spheroidite powder due to higher work-hardening rate and smaller cementite size. After long time ball milling, the equiaxed nanocrystalline ferrite with less than 10 nm stone size forms in the whole powders of both pearlite and spheroidite structures, and the cementite

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Formation Mechanism and Annealing Behavior of

mation of the powder particles leading to a gradual stone refinement and finally a nanocrystalline structure is formed. Nanocrystalline ferrite formation by ball milling in pure Fe (0.004mass% C) has been studied through morphology observation and microhardness measurements. It was found that nano-ferrite first formed at

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Structure and magnetic properties of NiZn ferrite/SiO2

Structure and magnetic properties of NiZn ferrite/SiO2 nanocomposites synthesized by ball milling ferrite, α-Fe and Fe2SiO4. For milling times smaller than 80 h, the complete transformation

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Zinc Ferrite Powder Synthesized by High Energy Reactive

The nanocrystalline zinc ferrite (ZnFe2O4) powder was synthesized by high energy reactive ball milling (RM) in a planetary mill. As starting materials a mixture of commercial zinc oxide (ZnO) powder and iron oxide (Fe2O3) powder was used. The starting mixture was milled for different periods of time, up to 30 h. The milled powders were annealed for 4 h at 350 oC in order to eliminate the

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Ferrite (magnet) Wikipedia

A ferrite is a ceramic material made by mixing and firing large proportions of iron(III) oxide (Fe 2 O 3, rust) blended with small proportions of one or more additional metallic elements, such as barium, manganese, nickel, and zinc. They are electrically nonconductive, meaning that they are insulators, and ferrimagnetic, meaning they can easily be magnetized or attracted to a magnet.

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Progress in Powder Metallurgy p. 6 Scientific.Net

Abstract: TiC particulate reinforced Fe matrix composite compacts with controlled interfacial reaction was processed by spark plasma sintering after mechanical alloying. Milled powders were fabricated for 1-5 hours by spex shaker mill with the ball to powder ratio of 25:2.

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Structure and magnetic properties of NiZn ferrite/SiO2

Structure and magnetic properties of NiZn ferrite/SiO2 nanocomposites synthesized by ball milling ferrite, α-Fe and Fe2SiO4. For milling times smaller than 80 h, the complete transformation

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Zinc Ferrite Powder Synthesized by High Energy Reactive

The nanocrystalline zinc ferrite (ZnFe2O4) powder was synthesized by high energy reactive ball milling (RM) in a planetary mill. As starting materials a mixture of commercial zinc oxide (ZnO) powder and iron oxide (Fe2O3) powder was used. The starting mixture was milled for different periods of time, up to 30 h. The milled powders were annealed for 4 h at 350 oC in order to eliminate the

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Ferrite (magnet) Wikipedia

A ferrite is a ceramic material made by mixing and firing large proportions of iron(III) oxide (Fe 2 O 3, rust) blended with small proportions of one or more additional metallic elements, such as barium, manganese, nickel, and zinc. They are electrically nonconductive, meaning that they are insulators, and ferrimagnetic, meaning they can easily be magnetized or attracted to a magnet.

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Progress in Powder Metallurgy p. 6 Scientific.Net

Abstract: TiC particulate reinforced Fe matrix composite compacts with controlled interfacial reaction was processed by spark plasma sintering after mechanical alloying. Milled powders were fabricated for 1-5 hours by spex shaker mill with the ball to powder ratio of 25:2.

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Nickel Ferrite Powder Obtained by High Energy Reactive

Nanocrystalline nickel ferrite powder was obtained using high energy reactive ball milling technique. Nickel oxide (NiO) and iron oxide (Fe2O3) powders were used as starting material. Milling was performed in air atmosphere using a planetary ball mill. Milling time was up to 30 hours. The product of milling was annealed at 350 oC for 4 hours in order to eliminate the internal stresses and

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Comparison of structure and magnetic properties of Mn–Zn

Nanocrystalline Mn 0.5 Zn 0.5 Fe 2 O 4 ferrite was successfully synthesized by ball milling a powder mixture of MnO, ZnO, and Fe 2 O 3 under argon and oxygen atmospheres. The effects of the milling time, milling atmosphere, and annealing temperature on the milled powders were examined. X-ray diffractometry (XRD), scanning electron microscopy, and transmission electron microscopy were used

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Preparation and characterization of Ni–Zn ferrite

for 12 h using a Retsch Co. high energy planetary ball mill. A ball to powder mass charge ratio of 14:1 was chosen. The speed of the mill was set at 400 rpm with an interval of 40 min. The total grinding time to prepare the ferrite powder was 40 h. The 40-h milled powder was sintered at 850 C/2 h. The powders were characterized using X-ray

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SPARK PLASMA SINTERING OF Mn-Zn FERRITE POWDERS BY

The initial ferrite powders composed of Fe 2O 3, Mn 2O 3 and MnZnFe 2O 4 oxides were charged with stainless ball into jars in high energy ball milling equipment. The ball milling was conducted with the ball to powder weight ratio of 20:1 and the milling rate of 300 rpm for 3 h under argon atmosphere. The

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Structure and properties of barium ferrite powders

The milling process of examined Fe2O3 and BaCO3 mixture leads to increase the content of Fe 2O3 phase and decrease the content of BaCO 3 (Fig.7,8). After 30 hours of high-energy ball milling the content of Fe2O3is 91 wt.% and 9 wt.% for BaCO3 phase. Milling process causes enriching of surface layer of powder particles by Fe2O3.

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Toll Processing Services Powder Processing & Technology

Powder Processing & Technology, LLC provides the equipment, facility and manpower for complete powder toll processing including wet grinding, toll milling and toll classification. We have the ability to pelletize powders, mill down pellets to powders, mill powders down to 0.5 µm in size, and batch and blend various sized powder quantities.

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High coercivity induced by mechanical milling in cobalt

High coercivity induced by mechanical milling in cobalt ferrite powders Ponce, A. S. 1, we used X-ray powder diffraction (XPD), transmission electron microscopy (TEM), and vibrating sample The milling process used was the high energy mechanical ball milling in a Spex 8000 miller. Details of the different milling processes to each sample are

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Effect of milling atmosphere on structural and magnetic

Powder mixtures of Zn, NiO, and Fe 2 O 3 are mechanically alloyed by high energy ball milling to produce Ni–Zn ferrite with a nominal composition of Ni 0.36 Zn 0.64 Fe 2 O 4.The effects of milling atmospheres (argon, air, and oxygen), milling time (from 0 to 30 h) and heat treatment are studied.

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Formation and annealing behavior of nanocrystalline

Nanocrystalline ferrite formation by ball milling in Fe-0.89C spheroidite steel and its annealing behavior have been studied through microstructure observations and microhardness measurements. It was found that at the early stage of ball milling, the dislocation density increases and dislocation cells form due to stone deformation.

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Effects of Milling Atmosphere and Increasing Sintering

Nanocrystalline Ni 0.36 Zn 0.64 Fe 2 O 4 was synthesized by milling a powder mixture of Zn, NiO, and Fe 2 O 3 in a high-energy ball mill for 30 h under three different atmospheres of air, argon, and oxygen. After sintering the 30 h milled samples at 500°C, the XRD patterns suggested the formation of a single phase of Ni-Zn ferrite.