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Du J.,Kunming University of Science and Technology | Du J.,National Local Joint Engineering Laboratory | Zhang Z.,Kunming University of Science and Technology | Zhang Z.,National Local Joint Engineering Laboratory | And 15 more authors.
Journal of Materials Engineering and Performance | Year: 2014

In this paper, ZrO2-coated LiNi1/3Mn 1/3Co1/3O2 is successfully prepared by the microwave pyrolysis method. The structure and electrochemical properties of the ZrO2-coated LiNi1/3Co1/3Mn1/3O 2 are investigated using x-ray diffraction, AC impedance, and charge/discharge tests, indicating that the lattice structure of LiNi 1/3Co1/3Mn1/3O2 is unchanged after the coating but the cycling stability is improved. As the coating amount is 2 wt.%, initial capacity of the coated LiNi1/3Co1/3Mn 1/3O2 decreases slightly. However, the cycling stability increases remarkably over the cut-off voltages of 2.75-4.3 Vand the capacity retention reaches 93.1% after 50 cycles. Electrochemical impedance spectra results show that the increase of charge transfer resistance during cycling is suppressed significantly by coating with ZrO2. © ASM International.

Uzunov P.,National Local Joint Engineering Laboratory
Academic Journal of Manufacturing Engineering | Year: 2016

The modern Permanent Magnet Linear Synchronous Motors (PMLSM) has a wide range of applications due to high efficiency, high thrust force density and high acceleration. In order to ensure normal operation and maximum thrust force density, the thermal performance must be done in the design stage. Based on FEMM software, in this paper thermal Finite-Element Analysis (FEA) of a 10-pole, 12-slot flat-type iron core, PMLSM was made. This motor was the first linear servomotor designed and produced in Bulgaria as a main drive unit of one linear electromagnetic transportation system for light industry with multiple moving parts.

Wang H.,National Local Joint Engineering Laboratory | Wang H.,Shenyang Jianzhu University | Wu Y.,National Local Joint Engineering Laboratory | Wu Y.,Shenyang Jianzhu University | And 2 more authors.
Academic Journal of Manufacturing Engineering | Year: 2015

The application of zirconia parts are limited by structure and machined surface quality. Precision grinding is one of the most efficient ways to improve surface quality. The MK2710 grinder and resin bond diamond wheel were used in zirconia grinding. The specimen grinding surface morphology were obtained by SEM. The paper focused on wheel speed, grain size and the affect of grinding depth on surface roughness and the removal mechanism, and determined the roughness change ruler. The research results indicate that decreasing the grain size and grinding depth, and increasing wheel speed could decrease specimen surface roughness and increase grinding surface quality. The results can improve ceramic parts surface quality and promote application.

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