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40 results on '"Wen, Ruilong"'

39. Mechanical Properties and Solid Particle Erosion Behavior of LaMgAl11O19-Al2O3 Ceramic at Room and Elevated Temperatures.

Author

Tang, Hao, Fang, Minghao, Min, Xin, Wang, Xiaojun, Huang, Zhaohui, Wen, Ruilong, Liu, Yangai, Wu, Xiaowen, and Hoffman, M.

Subjects
ALUMINUM oxide, CERAMIC metals, MECHANICAL properties of metals, EFFECT of temperature on metals, MECHANICAL wear
Abstract

In this work, the mechanical properties and solid particle erosion wear behavior of LaMgAl11O19-Al2O3 ceramics toughened and reinforced with LaMgAl11O19 platelets were investigated. The effects of LaMgAl11O19 additions, impingement angles (30°, 45°, 60°, 75°, and 90°), and erosion temperatures varying from room temperature to 1400°C on the erosion rates and material removal mechanisms of LaMgAl11O19-Al2O3 composites were systematically studied. The results indicated that LaMgAl11O19-Al2O3 ceramics exhibited superior erosive wear resistance compared to monolithic Al2O3 ceramics at room and elevated temperatures due to their enhanced mechanical properties and improved microstructure resulting from the introduction of an appropriate amount of LaMgAl11O19 platelets. Examination of the eroded surfaces of LaMgAl11O19-Al2O3 composites revealed that erosion temperatures and impingement angles play important roles in determining the erosion behavior and mechanisms of the tested materials. For the case of elevated temperature and oblique erosion, plowing and subsurface intergranular fracture are the predominant mechanisms resulting in material removal, whereas at room temperature and normal impact, the erosion process of the targets is primarily dominated by grain ejection and lateral crack intersection. [ABSTRACT FROM AUTHOR]

Published
2016
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40. Preparation and characterization of the properties of polyethylene glycol @ Si3N4 nanowires as phase-change materials.

Author

Zhang, Xiaoguang, Liu, Haitao, Huang, Zhaohui, Yin, Zhaoyu, Wen, Ruilong, Min, Xin, Huang, Yaoting, Liu, Yangai, Fang, Minghao, and Wu, Xiaowen

Subjects
*POLYETHYLENE glycol, *SILICON nitride, *NANOWIRE manufacturing, *PHASE change materials, *ULTRASONICS, *PHASE transitions, *X-ray diffraction
Abstract

In this study, novel polyethylene glycol @ Si 3 N 4 nanowires as phase-change materials (PCMs) were developed by using ultrasonic cell disruptor. The results obtained herein indicate that these nanowires can be a potential carrier for preparing PCMs. The results show that PEG is composited in a fluffy nano-network structure of Si 3 N 4 nanowires, which could not be easily leaked from this structure for the solid–liquid phase transition. X-ray diffraction and Fourier transform infrared spectroscopy were employed for investigating the structures of PCMs; the results show that a chemical reaction does not occur between PEG and Si 3 N 4 nanowires. Differential scanning calorimetry analysis results indicated that PCMs exhibit appropriate phase-change temperature and excellent high-phase change enthalpy. From the TGA results, PCMs exhibit perfect thermal stability. The PCMs could perfectly maintain their phase transition after 100 melting–freezing cycles. The thermal conductivity of PCMs-1 was 0.362 W/(mK), which was enhanced by 88.54% in comparison with that to pure PEG. The heat storage or release rate of PCMs is significantly more rapid than that of pure PEG for practical applications. [ABSTRACT FROM AUTHOR]

Published
2016
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