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Start Over Author "Lu, Zhen" Journal advanced materials research
35 results on '"Lu, Zhen"'

1. Step Reactive Sintering of Ti2AlNb Based Alloy with Element Powders

Author

Kai Feng Zhang, Lu Zhen, and Yuan Xin Wang

Subjects
Two temperature, Materials science, Sintered alloy, Alloy, Metallurgy, General Engineering, engineering, Sintering, Orthorhombic crystal system, engineering.material, Microstructure, Hot pressing, Homogenization (chemistry)
Abstract

As a new effort, combined reactive sintering with hot pressing technique, the Ti-22Al-25Nb alloy was successful prepared with element mixed powders. Meanwhile, the reactive sintering was divided into two temperature ranges, which were at 873 K and 1373 K, respectively. The starting sintering kept 1h at 873K, and then the temperature was increased to 1373K, keeping 2h. The orthorhombic (Ti2AlNb) phase was observed in this sintered alloy. Moreover, the homogenization treat was conducted at 1473 K for 2h after the final sintering was accomplished, and the fraction of the orthorhombic phase increased significantly. The microstructures and the phases were analyzed. And the generation mechanism of the orthorhombic phase was also analyzed.

Published
2013

2. Research on Parameter Simulation of Pulse Discharge Current in Permanent Magnet Motor Magnetization

Author

Lu Zhen Zhao, Yu Huai Kan, Peng Xiang Ren, Youhua Wang, Jing Yang, Zhi Gang Zhao, and Fu Gui Liu

Subjects
Electric motor, Materials science, business.industry, General Engineering, Electrical engineering, Mechanics, Coercivity, computer.software_genre, Simulation software, Pulse (physics), Magnetization, Remanence, Magnet, Waveform, business, computer
Abstract

In order to improve the magnetization effect of permanent magnet motor, it is requires accurate and efficient magnetization circuit except that we choose the permanent magnet with high coercive force. The method of pulse discharging for permanent magnet motor magnetization is simple, fast speed and the magnetization effect is good. The parameter selection of pulse circuits influences the magnetization effect directly. The pulse circuit parameters were simulated through parameter scanning method, using Pspice simulation software. Appropriate circuit parameters were obtained through comparing the pulse discharge current waveform, which will ensure the best magnetization effect of the permanent magnetic motor.

Published
2011

35. Influence of Calcination Temperature of TiO2 Support on CuO/TiO2 Catalysts for NO + CO Reaction

Author

Chen, Hao Jin, Zou, Han Bo, Lu, Zhen Peng, and Wu, Jian Ye

Abstract

A series of CuO/TiO2 catalysts were prepared with sol-gel and impregnation method and characterized by TG-DSC、FTIR、XRD and H2-TPR. The effect of calcination temperature of TiO2 carrier on the performance of CuO/TiO2 for the NO + CO reaction was investigated. The results showed that CuO/TiO2 (500°C, 15%) catalyst had superior catalytic activity with NO conversion and N2 selectivity of 99.5% and 82.3% at 350°C, respectively. The activities of the CuO/TiO2 catalysts were in the sequence of CuO/TiO2 (500) > CuO/TiO2 (600) > CuO/TiO2 (700) > CuO/TiO2 (400). Combined with TG-DSC and XRD patterns, the anatase phase transform into rutial phase at 462.9°C to 800°C in the TG-DSC patterns, while only rutile phase was present at 700°C in the XRD patterns. It indicated that CuO had a positive effect on phase transformation of TiO2 from anatase to rutial. The IR spectra demonstrated that there were some organic ingredients left in the surface of TiO2 gel before calcination. The results of H2-TPR suggested that the highly dispersed CuO was present on the CuO/TiO2 catalysts when the calcination temperature of TiO2 gel was below 500°C. Mixed oxide of CuO and TiO2 was formed when the calcination temperature of TiO2 gel was above 600°C.

Published
2012
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