High trapped fields in bulk MgB2 prepared by hot

Bulk superconducting MgB2 samples, 20 mm in diameter, were prepared by hot-pressing of ball-milled Mg and B powders using fine-grained boron powders. High maximum trapped fields of B0 D5:4 T were obtained at 12 K in one of the investigated trapped field magnets (height 8 mm) at the centre of the bulk surface. Investigating the temperature ...

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High trapped fields in bulk MgB2 prepared by hot

2013-11-5  Bulk superconducting MgB 2 samples, 20 mm in diameter, were prepared by hot-pressing of ball-milled Mg and B powders using fine-grained boron powders. High maximum trapped fields of B0 = 5.4 T were obtained at 12 K in one of the investigated trapped field magnets (height 8 mm) at the centre of the bulk surface.

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High trapped fields in bulk MgB2 prepared by hot

Bulk superconducting MgB2 samples, 20 mm in diameter, were prepared by hot-pressing of ball-milled Mg and B powders using fine-grained boron powders. High maximum trapped

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(FeSm) ––– (FeALPCBSIGa) COMPOSITES PREPARED BY

2007-3-18  The present study was aimed to prepare a material which combines a high magnetostrictive strain in low magnetic fields witha high mechanical strength. Therefore we prepared composites which consist of soft magnetic Fe77Al2.4P8.64C5B4Si2.6Ga0.8and high magnetostrictive (Fe2Sm) alloys. Ball milling of the amorphous FeAlPCBSiGa ribbon and a crystalline Fe2Smingot and subsequent hot pressing

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(PDF) Structure and mechanical properties of ball milled ...

Structure and mechanical properties of ball milled TiAI-Cr intermetallics consolidated by hot pressing and pulse plasma sintering February 2013 Reviews on Advanced Materials Science 8(2):158-163

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Bulk Al/SiC nanocomposite prepared by ball milling and

2006-6-1  The results show that nano-sized SiC particles is dispersed in aluminium uniformly after ball milled for only 2 h, whereas the similar process need about 10 h for popular micron-sized SiC particle. The bulk Al/SiC nanocomposite can be fabricated by hot pressing the nano-sized Al/SiC powders at temperature about 723 K. under pressure of 100 MPa.

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The microstructure and mechanical properties of ball ...

2011-11-1  A grain size of 20 nm was measured from the main Fe peak using the Scherrer formula and the hardness and skeletal density of the powder after milling were 620 HV and 7730 kg m −3, respectively. The ball-milled powder was then subjected to hot-pressing or laser sintering, as follows. 2.2.

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Effect of ball-milling on the phase formation and

2021-9-1  Scale-up processing of phase pure ZnSb thermoelectric materials in a shorter span of time using ball milling and hot pressing. • Investigation of the ZnSb phase formation in ball-milled powders. • Inspection of phase and thermal stability of ZnSb using XRD, DSC and thermoelectric properties characterizations. •

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Characterizations of ball-milled nanocrystalline WC–Co ...

2003-7-1  The rapid hot pressing was processed in high strength graphite die, high purity argon gas under an axial mechanical pressure of 35 MPa from temperature of 1260 to 1340 °C with different soaking times from 5 to 20 min. The density of the sintered samples was determined by the Archimedes method, using alcohol immersion.

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Influence of hot pressing temperature on thermoelectric ...

The XPD patterns of all annealed, ball milled and hot pressed samples can be indexed as type‐I clathrate phases, with weak additional peaks of a diamond‐like Ge phase, as exemplified in Fig. 1 with one series of samples (all annealed, ball milled and hot pressed at 700 °C).

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Synthesis of Ag-ZnO composites via ball milling and hot ...

2014-1-1  Abstract Ag — 8 wt. % ZnO composites were synthesized by ball milling, heat treating and hot pressing of silver and zinc oxide powder mixtures. The crystalline size and microstrain of the milled powders before and after heat treatment were determined by Debye-Scherrer andWilliamson-Hall methods. It was shown that heat treatment resulted in decrease of microstrain and increase in the ...

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High trapped fields in bulk MgB 2 prepared by hot

Bulk superconducting MgB 2 samples, 20 mm in diameter, were prepared by hot-pressing of ball-milled Mg and B powders using fine-grained boron powders. High maximum trapped fields of B 0 = 5.4 T were obtained at 12 K in one of the investigated trapped field magnets (height 8 mm) at

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Influence of hot pressing temperature on thermoelectric ...

The XPD patterns of all annealed, ball milled and hot pressed samples can be indexed as type‐I clathrate phases, with weak additional peaks of a diamond‐like Ge phase, as exemplified in Fig. 1 with one series of samples (all annealed, ball milled and hot pressed at 700 °C).

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The Effects of Powder Composition on Microstructure and ...

2019-11-26  The ball-milled powders were consolidated by hot pressing. Each powder was poured into four rectangular cavities of a graphite mold and consolidated to near-full density by passing a direct current through the mold under uniaxial compressive load.

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Compression-molded products based on wet ball-milled

2021-8-26  Ball milling with toluene, which is a non-polar solvent, is used as a pretreatment to extract lignin from milled wood (Bjorkman 1965; Ikeda et al. 2002). Here, wet ball milling created disintegrated products that were subsequently molded by hot-pressing.

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Microstructure studies of ball milled and vacuum hot ...

HRTEM studies of powders allowed to reveal small nanocrystals of NiTi2 within milled powders which were not detected using X-Ray diffraction. The powders show crystallization peak at temperature Tx near 553*C. Consolidation of powders was performed under vacuum using uniaxial hot pressing method at temperature slightly below Tx.

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Structural heterogeneity and its effects on the properties ...

2020-5-21  The microstructures of both ball-milled powders and hot-pressed composites were compared. Although the dislocation density of Cu matrix was changed after hot pressing, the mode of distribution of ceramic phases in the Cu matrix was noted to transmit from the ball-milled powders to hot-pressed composites in case of the TiH 2 particles ...

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Dry Processing and Recycling of Thick Nacre–Mimetic ...

2021-3-18  cryo ball-milling, making it easier to manipulate and homo-geneously disperse an ultrafine powder inside a metal mold for further pressing of the sample (Scheme 1c). Finally, hot-pressing the fine powder for 1 h at 170 °C and 10 bar results Scheme 1. Schematic preparation route of the dry processing of bulk-like nacre–mimetic nanocomposites.

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张法明 - Southeast University

2014-6-30  [52] J. Sun, F. Zhang, J. Shen. Characterization of ball-milled nanocrystalline WC-Co composite powders and subsequently rapid hot pressing sintered cermets. Materials Letters, 57(2003)3140-3148. 发明专利

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Hot-Pressing Scientific.Net

Journal of Biomimetics, Biomaterials and Biomedical Engineering Materials Science. Defect and Diffusion Forum

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Microstructure and microhardness of ball milled/hot ...

The microstructure and microhardness of a ball milled and hot pressed aluminium powder with 10 vol.% of magnesium nitride (Mg 3 N 2) were investigated.It was expected that the addition of a Mg 3 N 2 as an nitrogen-bearing substrate would allow to obtain an in situ reaction leading to a formation of an aluminium nitride (AlN) strenghtening phase. The powders were milled in a high energy ...

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Structural heterogeneity and its effects on the properties ...

2020-5-21  The microstructures of both ball-milled powders and hot-pressed composites were compared. Although the dislocation density of Cu matrix was changed after hot pressing, the mode of distribution of ceramic phases in the Cu matrix was noted to transmit from the ball-milled powders to hot-pressed composites in case of the TiH 2 particles ...

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Microstructure and mechanical properties of FeAl ...

Abstract: FeAl intermetallics were prepared by mechanical alloying and vacuum hot-pressing. The Fe-48 at.% Al powder was ball-milled for 3–12 h, producing a solid solution structure of Fe (Al) with trace Al (Fe). Subsequent vacuum annealing or hot-pressing introduced phase transformations into the FeAl (B 2) inter­ metallics and Al 2 O 3 inclusions.

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Effect of ball milling on the phase constitution and ...

2008-8-18  or short-time ball-milled samples. We also ob-served an obvious decrease of the powder aver-age grain size after ball milling from their broadened peaks. For the hot-pressed samples, the peaks are narrower than those of the pow-ders, indicating grain growth during the hot pressing. The SEM images of the ball-milled powders are shown in Fig. 3.

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Microstructure studies of ball milled and vacuum hot ...

HRTEM studies of powders allowed to reveal small nanocrystals of NiTi2 within milled powders which were not detected using X-Ray diffraction. The powders show crystallization peak at temperature Tx near 553*C. Consolidation of powders was performed under vacuum using uniaxial hot pressing method at temperature slightly below Tx.

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Nano-materials Enabled Thermoelectricity from Window ...

2012-11-13  In the prototype, a set of four ball milled followed by hot pressed Bi 1.75 Te 3.25 and Sb 2 Te 3 alloyed with sulfur nano-materials have been used as thermocouples (Inset b).

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Microstructures and Mechanical Properties of Nb/Nb ...

To develop advanced structural materials at very high temperatures, ball milling followed by reactive hot pressing was employed to fabricate binary Nb/Nb-silicide in-situ composites with 3.5 to 16 mol% silicon content. Changes in morphology during milling of niobium and silicon elemental powders were studied, and microstructures and mechanical properties of reactively hot pressed composites ...

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Microstructure and mechanical properties of aluminium ...

2018-9-6  The ball milled powders were cold pressed at 350 MPa and then vacuum hot pressed under 50 MPa at 500 °C for 60 min to produce Ф 20 mm disks. The disks were degasified to remove the stearic acid at 400 °C for 2 h before the hot pressing. The produced disks were grinded using abrasive papers and polished before the following characterisation.

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Hot-Pressing Scientific.Net

Journal of Biomimetics, Biomaterials and Biomedical Engineering Materials Science. Defect and Diffusion Forum

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Dry Processing and Recycling of Thick Nacre–Mimetic ...

2021-3-18  cryo ball-milling, making it easier to manipulate and homo-geneously disperse an ultrafine powder inside a metal mold for further pressing of the sample (Scheme 1c). Finally, hot-pressing the fine powder for 1 h at 170 °C and 10 bar results Scheme 1. Schematic preparation route of the dry processing of bulk-like nacre–mimetic nanocomposites.

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