Papers by Author: X.L. Wang

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Authors: S. Soltanian, M. Delfany, X.L. Wang, M.J. Qin, H.K. Liu, S.X. Dou
Abstract: MgB2 polycrystalline bulk samples with additions of 0, 5, 10 and 20% wt.% nano-sized BN powders were prepared using the reaction in-situ method. All the samples were sintered at 850°C for 1h in Ar. All the samples were characterized by X-ray diffraction, scanning electron microscopy (SEM) and magnetic measurements. The X-ray diffraction patterns show that the BN does not react with Mg and B during the heat treatment and remains as a separate phase. The synthesized materials thus contain two separate BN and MgB2 phases. In addition, the samples contain a small, almost constant amount of MgO. SEM shows that the samples contain MgB2 grains with average grain sizes of about 250 nm. Magnetic measurement results show that the critical current density and irreversibility fields decrease slightly as the BN level increases. The Tc drops slightly from 38.9 to 38.2 K and has a sharp transition with a transition width of less than 1 K. The field dependence of Jc for all the samples is also presented.
Authors: Jin Sheng Zhang, B. Huang, Zhenya Wang, X.L. Wang, Zeng Wen Liu
Abstract: The diamond wire-saw is a kind of stone machining equipment with flexible cutters. It is widely used in quarrying granite, machining of quarry stones and various special-shaped stones. Experiment has been carried out on the parametric relations among wear form, cutting liner speed and tightening force of diamond wire according to the experimental result of diamond wire-saw in quarrying Shidao Red granite with high efficiency. The suitable working parameters of diamond wire-saw in granite cutting are discussed in the paper, the purpose of which is to improve productivity and quality, and to reduce the cost of the diamond wire-saw as well as to make good use of advantages of diamond wire-saws. Practice proves that diamond wire-saw is an ideal equipment with high economy index in quarrying granite.
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