Papers by Keyword: Micro-Morphology

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Authors: Guoliang Wang, Kai Ming Liang, Wei Liu, An Min Hu, Feng Zhou, Hua Shao
Abstract: By means of SEM, the micro-morphology of silver particles separated from borosilicate glass by the heat-treatment with an electric field is investigated. The distribution of the silver particles appears clusters. This result is explained by an energy viewpoint. Based on hermodynamics theory of phase separation, the calculation of the free energy change during the heat-treatment in an electric field is performed by means of the Ansoft Maxwell software. The results of this calculation analysis are found to be very close to the experimental data.
Authors: Wei Fu, Meng Li Yang, Qing Hong Guo, Xiao Rong Huang, Ming Chun Chai, Wei Guo
Abstract: A preliminary study on the micro-structure of a special sericite-jade material has been carried out by using the XRD and SEM methods. By XRD analysis, the 2M1 type sericite is identified as the main mineral composition of the white-colored, yellow-colored and green-colored jade. Quartz, as the secondary mineral, is also common in the green-colored jade. However, the dominant mineral composition of the black-colored jade is chlorite. SEM analysis reveals both the micro-morphology of the jade-forming minerals and the micro-structure of the mineral aggregates are various, which have significant relationships with the Guangning jade quality. Minuscular mineral grains and compact micro-structure make jade materials exquisite. Conversely, large mineral grains and the loose micro-structure make jade materials more rougher.
Authors: Ya Li Hou, Chang He Li, Yu Cheng Ding
Abstract: Based on the modeling and experiments concerning the surface roughness in abrasive jet finishing with grinding wheel as restraint, the effect of abrasive size, abrasive fluid concentration, machining cycles, wheel velocity and carrier fluid on machined surface quality was investigated. Surface grinder M7120 was employed in a jet machining experiment conducted with W18Cr4V and 40Cr materials, profilometer TALYSURF was used to measure the micro geometrical parameters after machining, and SEM was used to observe surface micro-morphology. Experimental results show that with W7 Al2O3 powder at the mass fraction of 10% and antirust lubricating liquid being adopted in jet machining for 20 to 30 cycles, not only high surface shape precision can be kept or obtained, but also defect-free machined surface with the roughness of Ra0.15~1.6µm can be obtained with high efficiency. Experimental observation and experimental results proved that the experimental results agree well with a mechanism-based machining model.
Authors: Shao Hui Yin, Kun Tang, Hitoshi Ohmori, Xian Liang Zeng, Feng Jun Chen, Yu Wang
Abstract: This paper reports a systematic investigation of a nozzle-type ELID grinding characteristics of cemented carbides. Two groups of experimental scheme were carried on by using fine grain cast iron diamond wheel and nozzle-type ELID grinding apparatus. The grinding forces were measured by a dynamometer and the ground surfaces were characterized using scanning electron microscopy (SEM) and atomic force microscope (AFM). The influences of electrolytic and grinding parameters on grinding force were discussed. The material removal mode and micro-morphology characteristics were also analyzed.
Authors: Qin Li, Ke Wei Sun
Abstract: Two groups of buildings residues was studied in the paper as to unconfined compressive strength, soaked unconfined compressive strength, shrinkage values, porosity. It is show that Q2 soil stabilizer can improve the micro-structure of solidified blocks of buildings sediment for dispersed sphere-shaped particles can be generated by Q2 soil stabilizer mixed with buildings residues and cement. As a result, the solidified block of buildings sediments was improved in the properties in its increased unconfined compressive strength, decreased shrinkage values and higher durability.
Authors: Ying Ying Shi, Qiang Hua Zhang, Qing Ping Xiong, Chen Hong Xu, Fei Liu
Abstract: The micro-morphology and metal elements composition of Inhalable particles (PM10) in Huaian typical zone were studied in this paper using scanning electronic microscopy (SEM) and inductively coupled plasma-atomic emission spectrometry (ICP-AES). PM10 samples were collected for 24 h using high-volume air sampler from Qinghe zone. The SEM analysis showed that mineral particles with regular shapes were popular in PM10 in Qinghe district. The composition of metal elements analysis showed that enrichment factor of Cr, Ni, Cu, Zn, Pb, Cd, As of are greater than 10, the results indicate that these elements mainly come from anthropogenic pollution. PM10 in Huaian typical zone was more sourced from industrial pollution than other sources.
Authors: Qin Li
Abstract: Different contents of building residues and whether soil stabilizer is added or not can affect the microstructure of the solidified mass, and thus lead to the change of unconfined compressive strength. The stu dy process is described in the paper. The result shows that the more soil is contained in the building residues, the lower porosity and higher unconfined compressive strength of the solidified mass will be. The acicular ettr ingite can be formed by adding soil stabilizer to make the pores smaller and evener, and thus improve their fra ctal dimensions and unconfined compressive strength.
Authors: Qin Li, Ke Wei Sun, Qiu Ling Chen
Abstract: Comparson research as to the relationship between building residues solidified by cement and those solidified by soil stabilizer are made , and the unconfined compressive strength of them increased over time are analyzed in the paper. When the soil stabilizer is mixed with the building residues, the acicular ettringites acting as inlay or infilling are formed in the solidified body. This is the reason why their unconfined compressive strength are increased. Some relevances show that the more the acicular ettringite was formed, the higher the confined compressive strength of the solidified bodies would be, and vice versa.
Authors: Fu Xing Wang, Guo Zhong Li, Juan Chen
Abstract: The effect of some factors(dosage and grain size of recycled fine aggregate of construction waste, content of mineral admixture) on the properties of cement mortar was studied. The results indicated that when recycled fine aggregate particles gradation was areaⅡ, replacement percentage (sand) was 60%,dosage of mineral admixture was 36%, compared with blank sample, the 28d flexural strength and the compressive strength of cement mortar samples were increased by 30.7% and 37.2%, respectively. Micro-morphology of section on cement mortar was observed by SEM. Identifying the hydration products through XRD was carried out.
Authors: Xiujiang Shi, You Qiang Wang
Abstract: The elastohydrodynamic lubrication (EHL) study of water-based ferrofluid bearing with single sine-shaped peak, rectangular-shaped valley and V-shaped valley was carried out. The influence of the amplitude and the width on the pressure and film thickness was discussed. The results reveal that the pressure and film thickness change apparently with the change of micro-morphology; The amplitudes of the local pressure peak and the film thickness increase with the increase of amplitudes; The widths of the local pressure peak and the film thickness increase with the increase of width.
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