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The mechanochemical transformation of Ca(OH) 2 –(NH 4) 2 HPO 4 with different Ca/P ratios 1; 1.5; 1.67 and 1.75 was carried out for different periods of time from 10 min to 24 h in a horizontal vibration mill using steel and agate vials and balls. The phase transformations obtained at each milling stage were characterized by X-ray diffraction, infrared spectroscopy …
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The micro-strain of the copper phase increases with milling time and reaches 0.266 % for 50 h of milling. The greatest micro-strain of the copper phase also occurs during the first two hours of milling and its value reaches about 0.172 %.
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H v increased as the ball-milling time increased, and the behavior of H v −F is represented by normal indentation size effect. It was found that there is no significant relation between the variation of H v with t and that of J c with t ; the result from H v is strongly dependent on the strength and kind of bonds between the grains.
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The densification behavior of the dual-nanoparticulate-reinforced composites varied with the milling time. The crystallite sizes of Al in composites became significantly smaller when the milling time was increased. Moreover, the high-energy ball milling time significantly affected the microstructure and mechanical properties of the composites.
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ball diameters [4]. The residence time was material dependent and thus depended on the grindability or hardness of the sample ore. The products from the four milling processes were screened using a range of different aperture screens to determine the extent of size reduction (comminution ratio) as well as the size distribution of the
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The effect of milling time on the morphology, microstructure, physical and mechanical properties of pure Al-5 wt % Al₂O₃ (Al-5Al₂O₃) has been investigated. Al-5Al₂O₃ nanocomposites were fabricated using ball milling in a powder metallurgy route. The increase in the milling time resulted in the homog …
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The increase in the milling time resulted in the homogenous dispersion of 5 wt % Al2O3nanoparticles, the reduction of particle clustering, and the reduction of distances between the composite particles. The significant grain refining during milling was revealed which showed as a reduction of particle size resulting from longer milling time.
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Table 2. Effect of milling time on the Fe amount of the reinforced powder Milling time [h] 0 5 10 15 20 26 Fe [%] 0.42 1.49±0.53 1.786±0.35 2.01±0.4 2.48±0.17 2.65±0.47 In order to evaluate the nature of the Fe phase, whether it is in the form of a solid
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obtained after 50 h of the ball milling time. In order to get more information about the effect of ball milling time on the distribution of Mn. 3.6 Ti 2.4 powder particles embedded into the host MgH 2 matrix; intensive STEM-EDS X-ray elemental mapping were performed for all the samples after ball milling time. Figure 3 presents the
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Micrographs showing the effects of milling time. Samples were milled with 50 pellets at 200 RPM for (a) 1, (b) 2, (c) 4, and (d) 8 h.
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SrTiO3 sample has been successfully prepared by mechanical alloying (MA) method. The effect of milling time on microstructure, crystallite size and dielectric properties of SrTiO3 were studied. The results revealed that the mean crystallite size of milled powders decreased from 84.56 to 12.87 nm with increasing milling time. However, the average lattice strain of milled …
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Effects of milling time on the development of porosity in Cu by the reduction of CuO. Microscale and nanoscale CuO was dispersed in Cu using room temperature high-energy ball milling over time intervals of 5, 30, 60, 120, and 240 min. These samples were then annealed under a reducing atmosphere for 1 h at temperatures of 400, 600, 800 and 1000 ...
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Al2O3-TiO2-graphite nanocomposite can be used as alternative material for coating application. Fine composite coating particles is commonly produced by milling in a high energy ball milling. This study focused on evaluate the effects on the structural, microstructural and physical properties of Al2O3-TiO2-graphite nanocomposite. The alumina, titania and graphite powder …
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The effect of different milling time on thermoelectric properties of bismuth telluride (Bi 2 Te 3) was investigated. The nanomaterial was prepared by varying the ball milling time and followed by hot press sintering. The crystal structure and phase formation were verified by X-ray diffraction and Raman Spectroscopy.
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【Abstract】 The Ti2 SnC conductive ceramic materials were synthesized by using Ti,Sn and C as the reaction materials.The effects of milling time on the phase composition and microstructure of Ti-Sn-C mechanical alloying products were studied.The results show that the Ti2 SnC typical lamellar structure is observed by the XRD pattern of Ti2 SnC as the main peak …
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Ball milling (BM) is a well-established technique for producing different materials in powder shape. Dynamical analysis of BM helps to optimize the process through simple but general relations (e.g., definition of an equivalent milling time). Concerning the field of study of magnetocaloric effect (MCE), BM is used in different ways: as a single step process …
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It was also found that milling time influences the powder morphology, particle size and yield of the powder. Moreover, longer milling time leads to decrease in powder yield.
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Materials Research Express PAPER (IIHFWRIPLOOLQJWLPHRQWKHPLFURVWUXFWXUHDQG PHFKDQLFDOSURSHUWLHVRI7L & 1 VWDLQOHVV VWHHOFHUPHW To cite this article: Lin He et al 2018 ...
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Request PDF | On Jan 10, 2014, H. S. Kwon and others published Effect of milling time on dual-nanoparticulate-reinforced aluminum alloy matrix composite materials | Find, read and cite all …
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Al-5Al2O3 nanocomposites were fabricated using ball milling in a powder metallurgy route. The increase in the milling time resulted in the homogenous dispersion of 5 wt % Al2O3 nanoparticles, the reduction of particle clustering, and the reduction of distances between the composite particles. The significant grain refining during milling was…
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The effect of ball milling times on mechanical and electrical properties was analyzed. The following conclusions can be drawn: 1. With an increase in ball milling times, the morphologies of composites powder deforms from original spherical shape to flake shape. The longer the ball milling time is, the thinner the composite powder thickness and ...
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Materials Research. 2020; 23(6): e20200337 Effect of Cobalt Doping and Milling Time on Microstructure and Vickers Microhardness of the Spark Plasma Sintered (67-x)Ti-xCo-22Si-11B (x = 2 and 6 at-%) Alloys Nelson Damásio Ferreiraa, Ricardo Mendes Leal Netob c, …
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The effect of milling time on the morphology, microstructure, physical and mechanical properties of pure Al-5 wt % Al2O3 (Al-5Al2O3) has been investigated. Al-5Al2O3 nanocomposites were fabricated using ball milling in a powder metallurgy route. The increase in the milling time resulted in the homogenous dispersion of 5 wt % Al2O3 nanoparticles, the reduction of particle …
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The mechanically milled show finer and better distribution of reinforcement particle what lead to better mechanical properties of obtained product. The results are increasing the milling time significant to improve the mechanical and physical properties of the Aluminum metal matrix composite produced. ABSTRAK
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Effect of ball milling time on microstructures and mechanical properties of mechanically-alloyed iron-based materials May 2010 Transactions of Nonferrous Metals …
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Owing to its many exceptional properties, aluminium finds many applications in theaerospace, automotive, building and packaging industries. Enhancing its properties through alloyingor thermal treatments has been the focus of researchers' interests for a long time. In this work, purealuminium powders were mechanically milled for up to 12 hrs and then were cold …
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Milling time, in wet-milling procedures, has also been established, by Can et al. and Janot et al., as a determinant factor for the production of single-phased pure SPIONs [94, 96], with non ...
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3.1 Milling process using ball milled 24 3.2 Some common bowl geometries for milling process 24 3.3 Compaction process using mold and die 25 3.4 Compaction process using hidraulic press 26 3.5 Sintering process using furnace 27 3.6 Hardness Vickers Test 28 3.7 Microscope Image Analyzer 29 4.1 Effect of milling time on the hardness of Al-Al2O3 ...
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The effect of four different milling conditions on NMC materials was evaluated: (i) milling time, (ii) milling speed, (iii) ball size/number of balls, and (iv) co-milling NMC with carbon. Shown in Table 1 are the material labels and the specific milling conditions.
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WC-Co vials and balls were employed to avoid contamination. For each milling, the ball-to-powder ratio was kept constant at 4:1 and the milling time was set at 6 h (three separated steps of 2 h effective milling each) . The milling speed has been varied from 300 to 750 rpm with a 150 rpm gap between experiments as displayed in Table 2. Dry ...
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