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phase component AND CURIE TEMPERATURE OFNd_4(Fe_(1-x)Cr_x)_(77.5)B_(18.5)ALLOYS

Acta Metallurgica Sinica(English Letters) 1997年第1期10卷 71-73页

作者： B.X. Gu J.R. Zhang B.G. Shen and H Wang (Department of Physics, Nanjing University, Nanjing 210093, China)(State Key Lab. of Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China)(Department of Physics, Southeastern Universit Nanjing Univ Nanjing China

The phase component and Curie tempemture of Nd4(Fe1-xCrx)77.5B18.5 (0 0.1. The magnetic measurement shows that Curie temperutures of Fe3B and Nd2Fe14B phases decrease with increasing Cr content. The influence of the ... 详细信息

The phase component and Curie tempemture of Nd4(Fe1-xCrx)77.5B18.5 (0 phases in the samples with x phases in the samples with x > 0.1. The magnetic measurement shows that Curie temperutures of Fe3B and Nd2Fe14B phases decrease with increasing Cr content. The influence of the substitution of Cr for Fe was discussed.

关键词： Nd_4(Fe_(1-x)Cr_x)_(77.5)B_(18.5)alloy phase component Curie temperature

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Comparison of Concrete Carbonation Process under Natural Condition and High CO_2 Concentration Environments

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Journal of Wuhan University of Technology(Materials Science) 2010年第3期25卷 515-522页

作者：姬永生 State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining and Technology Xuzhou School of Mechanics & Civil Engineering China University of Mining and Technology Xuzhou

To compare the results obtained under both natural and accelerated environments,the pH values of carbonated concrete were measured,the variation of pH values was determined,and the variations of Ca（OH）2 and CaCO3 contents in the carbonated concrete under natural condition and high CO2 concentration accelerated climate environments were determined by microcosmic test methods such as DTA and X-ray *** experimental results showed that the overall variation trend of pH values and phase component of carbonation layer of concrete under accelerated climate environments with high CO2 concentrations were the same as those under natural ***,the carbonation processes of concrete were considered consistent under both *** there was a difference in the length of semi-carbonation *** one measured under high CO2 concentration accelerated climate environments was shorter than that under natural *** investigation showed that it was caused by the differences in climate condition（temperature and relative humidity） as well as the properties of the *** concentration of CO2 and the duration of the carbonation process have no effect on the length of semi-carbonation ***,it is acceptable to simulate the natural condition by applying the high CO2 concentration artificial accelerated carbonation technique for the purpose of the study of carbonation process of concrete.

关键词： natural carbonation artificial accelerated carbonation phase component semi carbonation zone correlation

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