Improved oxidation resistance of SmCo magnetic alloy powders by silanization

Qadeer, Muhammad Ifran; Azhdar, Bruska; Hedenqvist, Mikael S.; Savage, S. J.

doi:10.1016/j.porgcoat.2012.08.014

Cited by 9 publications

(6 citation statements)

References 17 publications

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“…It is known from a previous study [9][10][11] that the particles contain a small amount of oxygen and that hydroxyl groups probably exist on the surface. IR absorbance spectra on asreceived particles in the hydroxyl region (supplementary material, Fig.…”

Section: Resultsmentioning

confidence: 99%

“…It should be mentioned that, because of residual magnetism, it was unavoidable that some small particles occurred in all fractions; these were attached to the larger particles and followed these during the sieving. The densities of the as-received particles and silane-coated particles were determined by the Archimedes principle (using propanol as liquid) and were found to be 8200 kg m -3 (asreceived powder), 7500 kg m -3 (GPTMS-coated), 8140 kg m -3 (MTMS-coated), and 7800 kg m -3 (APTMScoated) [9]. Based on these densities, the amount of silane coating on the particles was estimated to be: 1.4 wt% (9.8 vol%) GPTMS, 0.1 wt% (0.8 vol%) MTMS, and 0.7 wt% (5.6 vol%) APTMS.…”

Section: Resultsmentioning

confidence: 99%

“…The influence of the silane depends on the amount (thickness, degree of coverage) of coating material on the particles and the miscibility between the silane and the polymer. From the previous study it is known that the degree of coating coverage is good for all the silanes since they all improved significantly the high temperature oxidation resistance of the particles [9]. The amount of the coating material was estimated as described above and the miscibility between the silane the polymer was here assessed by using the Hansen solubility parameter method.…”

Section: Rheologymentioning

confidence: 99%

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Rheological and dynamic mechanical properties of polymer-bonded magnets based on Sm2Co17 and polyamide-12

et al. 2014

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The rheological and dynamic mechanical properties of polymer-based composites of Sm 2 Co 17 and polyamide-12 with different particle loadings, sizes, and surface treatments are reported. Sm 2 Co 17 particles were surface-treated with three different silanes: 3-glycidoxy(propyl)trimethoxysilane, 3-amino(propyl)trimethoxysilane (APTMS), and methyltrimethoxysilane (MTMS). It was shown, for the composites with untreated particles, that the viscosity and storage modulus increased with increasing filler content (0-60 vol%) and decreasing filler particle size. In addition, the glass transition temperature increased significantly and the damping decreased with increasing filler content. Of the silanes, the MTMS, which yielded only a thin surface layer, had in general the least effect on the rheological properties of the composite. The composite containing the APTMS-coated filler showed the highest storage modulus. The results give new insights on how to prepare polymer-bonded magnets with optimal process conditions (rheology) and dynamic mechanical properties, by varying the amount of particles, their size, and surface treatment.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Rheologymentioning

confidence: 99%

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Rheological and dynamic mechanical properties of polymer-bonded magnets based on Sm2Co17 and polyamide-12

et al. 2014

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“…In technological applications, Nd is extensively used in neodymium‐iron‐boron permanent magnets (NdFeB magnets) [4] . Likewise, Sm−Co permanent magnets are widely used in automotive and aircraft industries and can even be operated above 150 °C [5] . Oxides of europium are widely used as phosphors in devices like television, fluorescent lamps, phone circuitry etc.…”

Section: Introductionmentioning

confidence: 99%

Amine/Carboxylic Acid Based Bifunctional Ionic Liquids as Extractants for Nd(III), Sm(III) and Eu(III) from Aqueous Solution Containing EDTA

2022

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Two bi-functional ionic liquid extractants (Bif-ILs) comprising tertiary amine and carboxylic acids, namely [TOAH] + [OHex] À (Tri-n-octylaminehexanoate) and [TOAH] + [ODec] À (Tri-n-octylaminedecanoate) in kerosene have been used for extraction of Nd(III), Sm(III) and Eu(III) from aqueous phase with EDTA as a complexing agent. The extraction ability of both the extracting agents has been analyzed with respect to variations in shaking time, concentration of extractant, aqueous phase pH, molarity of EDTA, diluents and phase volume ratio. Using 0.08 mol/L EDTA,extraction of Nd(III) was maximum with both the extractants followed by Sm(III) and Eu(III).At 4 : 1 (O/A) phase volume ratio, the extraction percentages using [TOAH] + [OHex] À were 93.42 % (Nd), 89.83 % (Sm), 84.14 % (Eu) and with [TOAH] + [ODec] À the values were 90.42 % (Nd), 89.37 % (Sm), 83.65 % (Eu), respectively.Extraction efficiency of both Bif-ILs is maximum for Nd(III). Stripping was quantitative with HNO 3 and HCl.Speciation studies and FTIR spectra provide valuable information regarding the stoichiometry of the extracted species.

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“…Modern magnets have been used in industry since the 1980s mostly due to their low cost, high corrosion resistance, chemical stability, steadiness at relatively high temperatures, and propriety in a wide variety of applications [1][2][3][4][5][6][7]. M-type hexaferrite SrFe 12 O 19 is usually and essential ferromagnetic structure magnet that has been greatly studied because of its prominent applications in high density magnetic recording, microwave, and electronic devices [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

A novel method for synthesizing narrow particle size distribution of holmium–doped strontium hexaferrite by sol-gel auto-combustion

Saeed

Azhdar

2020

Mater. Res. Express

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In this study, a new technique put in to the sol-gel auto-combustion method which is the preparation of solutions and treatment of products by using ultrasonic liquid sonicate. Different atomic concentrations of Holmium-doped strontium hexaferrite (SrFe 12−x Ho x O 19 ) been synthesized by the conventional sol-gel auto-combustion method. This new technique estimates as a novel method which escalates the amount of Ho +3 present in strontium hexaferrite of produced powder by 500% compared to the conventional method when Ho +3 substitution was 15% of atomic weight. Characterization of produced powders, porosity, unit cell volume, and lattice parameters were tested and calculated from x-ray diffraction. Morphology, particle size distribution, and shape of nanoparticles were analyzed by field emission scanning electron microscope. Primary particle size and particle size distributions were studied by transmission electron microscope. The purity and elemental composition of products were tested by energy dispersive spectrometer. Bulk density, crystallinity, and purity increased with decreased crystal size and porosity when nanoparticles were treated by ultrasonic method. Morphology, purity, narrow particle size distribution, and nanoparticles with isomorphic geometry can be controlled with Ho +3 substitution by 15% of atomic weight when powder is produced by this novel method. This new technique provides an improved new method for narrowing particle size distribution, increasing density, and substitution limit of rare earth ions to hexaferrites.

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Improved oxidation resistance of SmCo magnetic alloy powders by silanization

Cited by 9 publications

References 17 publications

Rheological and dynamic mechanical properties of polymer-bonded magnets based on Sm2Co17 and polyamide-12

Rheological and dynamic mechanical properties of polymer-bonded magnets based on Sm2Co17 and polyamide-12

Amine/Carboxylic Acid Based Bifunctional Ionic Liquids as Extractants for Nd(III), Sm(III) and Eu(III) from Aqueous Solution Containing EDTA

A novel method for synthesizing narrow particle size distribution of holmium–doped strontium hexaferrite by sol-gel auto-combustion

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