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A Study on Synthesis Kinetics of YBa_2Cu_3O_x High Tc Superconductor Powder
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作者 谭爱纯 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 1989年第5期357-361,共5页
The synthesis kinetics of YBa_2Cu_30_x supercon- ductor was studied through comparing the calcina- tion (sintering) processes of different kinds of powders. It was shown that the temperature of synthesis of YBa_2Cu_30... The synthesis kinetics of YBa_2Cu_30_x supercon- ductor was studied through comparing the calcina- tion (sintering) processes of different kinds of powders. It was shown that the temperature of synthesis of YBa_2Cu_30_x phase can be lowered from 950℃ to 800℃ through direct calcination of multiphase powder with uniform chemical com- position. The stress which is caused by the volume change during synthetic reaction breaks the particles. It facilitates the formation of highly active superfines of superconductor. 展开更多
关键词 High T_c superconductor synthesis kinetics calcination process sintering of multiphase powder
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Processing of Calamine with Modern Analytical Techniques:Processed with Huanglian Decoction(黄连汤)and Sanhuang Decoction(三黄汤) 被引量:2
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作者 MENG Xiang-long MA Jun-nan +4 位作者 GUO Xiao-hui LIU Bing-chen CUI Nan-nan LI Kun ZHANG Shuo-sheng 《Chinese Journal of Integrative Medicine》 SCIE CAS CSCD 2017年第11期850-857,共8页
Objective: To determine the pyrolysis characteristics of calcined and processed calamine, qualitatively and quantitatively compare the contents of related elements, morphology and functional groups of the pyrolysis p... Objective: To determine the pyrolysis characteristics of calcined and processed calamine, qualitatively and quantitatively compare the contents of related elements, morphology and functional groups of the pyrolysis products dried at different heating temperatures and explore the critical temperature and the optimal drying temperature for the process of calamine with Huanglian Decoction(HLD, 黄连汤) and San Huang Decoction(SHD, 三黄汤). Methods: Pyrolysis products were prepared by programmable and constantly heating the calcined and processed calamine to or at different heating temperatures. Thermogravimetry(TG) was used to test their pyrolysis characteristics. Fourier transform infrared spectroscopy and scanning electron microscopeenergy dispersive spectrometer were used to determine their morphology, functional groups and element contents. Page model was used to investigate the constant drying kinetics of processed calamine. Results: The adding of HLD or SHD to calcined calamine(CC) can slow its weight loss in drying pyrolysis process. The temperature ranges where HLD and SHD can affect its weight loss were 65–150 ℃ and 74–180 ℃, respectively. The drying temperature was optimized as 90 ℃. The drying kinetic for the processed calamine fits Page model shows good linearity. Conclusions: The critical temperature and the optimal drying temperature where HLD and SHD can affect the weight loss rate in the process of calamine were explored using the theories and methods of both biophysical chemistry and processing of Chinese materia medica. This work provides a good example for the study of the process of other Chinese medicines using modern analytical techniques. 展开更多
关键词 processing of Chinese materia medica calcined calamine processed Calamine thermogravimetry fourier transformation infrared spectrometry scanning electron microscope-energy dispersive spectrometer
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