Papers by Keyword: Ball Milling

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Authors: Wei Liu, Qiu Lin Li, Wei Liu, Guo Gang Shu, Qi Sun, Chang Qing Ye
Abstract: The paper introduces a new method to produce large sized Al-B4C-Al2O3np composites, which combines ball milling to prepare Al2O3np/Al mixed powder and semi-solid casting to contribute the injection of Al2O3np/Al mixed powder into the melt. The deformation performance of Al2O3np and micro-Al through ball milling with different Al/Al2O3np ratios, different milling time and different balls were studied respectively. It was revealed that micro-Al particles were milled from twisted and crimpled foil pieces to shuttles with Al2O3np embedded on it through 4h milling with 10mm balls. And we consider it as the best bonding between Al2O3np and micro-Al we could attain. And a plate of 25kg of Al-B4C-Al2O3np composite was fabricated successfully with the injection of the Al2O3np/Al mixed powder. Spherical Al2O3np of 300nm and needle-like TiB2 with 200nm in radius and 800nm-4μm in length were found in SEM photographs. Tensile properties of Al-B4C-Al2O3np composites were tested at room temperature and high temperature. It was showed higher mechanical properties than Al-B4C composites at room temperature and elevated temperature. Particularly, a 40% increase of UTS of Al-15wt.% B4C-1wt.%Al2O3np at 350°C was observed.
84
Authors: T.C. Bor, M.C. Huisman, Rob Delhez, Eric J. Mittemeijer
145
Authors: Wei Li, Cheng Ge Wu, Qiang Han Fang
Abstract: The iron-based composite ceramic powder Fe-WC is produced by ball milling with synthetic tungsten mine and graphite. The process is accomplished through mechanical activation and reductive diffusion of the reactant powders during the milling process. The products are analyzed by means of XRD, DTA and EPMA. The results approved that the reaction does not carry through completely when the milling time is less than 8h. However, the composite powder of Fe and WC is gained by annealing from powders milled under 180V of the milling machine. The apparent activation energy of the reductive reaction is gradually decreased with the extending of milling time by mechanical activation.
122
Authors: Jun Zhang, Sheng Ru Qiao
Abstract: Titanium Silicalite-1 (TS-1) was successfully synthesized from amorphous silica and titania powders by using a ball-milling method. In this method, amorphous fumed silica and anatase titania powders were ground in a planetary ball mill to produce a silica-titania precursor. The obtained precursor was then hydrothermally treated where TPABr was used as a template to obtain titanium silicalite-1 (TS-1). The XRD and UV-vis spectra indicate that the titanium in anatase with octahedral coordination is incorporated into the silica-titania precursor and the final TS-1 framework with a tetrahedral coordination. SEM image shows that TS-1 synthesized in this work appears in a shape of elongated prism with a dimension of about 3μm×1μm×0.2μm. This method gives a simple new approach to the synthesis of TS-1 using inexpensive silicon source, titanium source and template.
475
Authors: S. Manikandan, J. Jancirani
Abstract: This study investigated the preparation of nanosized crystalline SiC powders from micro sized Silicon Carbide powder at room temperature through high energy ball milling. Silicon carbide was milled with hardened steel balls and ball milling media under identical conditions of ball mass to powder mass ratio 10:1 and target milling times of 60 h. The sample was taken out after every 20 hours of milling and it was characterized for its crystalline size, lattice strain, and percentage of crystalline by using X-Ray Diffractometer (XRD). It was found that for the 60 hours The size, shape and texture of the fresh as well as nanostructured Silicon carbide powder were studied using Scanning Electron Microscopy (SEM). The raw Silicon carbide powder particles were mostly angular in shape. The shape of the 60h milled particles is irregular and the surface morphology is rough.
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Authors: Tang Kai, Yan Jie
Abstract: Several surfactants were studied in cemented carbides ball milling in this paper by analyzing cemented carbides mechanical properties and SEM images. Appropriate surfactants used in ball milling were selected to replace commonly used surfactant, stearic acid. Impacts of surfactants on hardness, magnetic force and magnetic saturation were also discussed. Oleic acid and AEO-3 as the better surfactant than stearic acid were selected after experiments. How containing oxygen compound affects the cemented carbide mechanical property cannot be recommended at this stage; further investigations are required.
100
Authors: Yuan Qiang Jin, Rui Luo
Abstract: In this paper, The authors briefly introduced preparation mechanism of quartz nano-powder by ball milling, Analyzed the process parameters on the effect of quartz nano-powder preparation. used orthogonal experiment to study the test method of quartz nano-powders prepared by ball milling, applicated artificial neural network technology to build a prediction model of powder parameters based on BP network and optimized the BP network weights and improved the prediction model of quartz particle size based on BP network by using the global search capability of genetic algorithm . This study showed that the model has higher accuracy and realize acceptable prediction of powder particle size. The technology provided the theoretical guidance for further study on its parameters selection and the preparation of quartz nano technology industrialization.
2048
Authors: Jian Yu Huang, Yuntian T. Zhu
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