Metastable liquid phase separation and rapid solidification in a metastable miscibility gap were investigated on the Cu60Co30Cr10 alloy by using the electromagnetic levitation and splat-quenching.It is found that the ...Metastable liquid phase separation and rapid solidification in a metastable miscibility gap were investigated on the Cu60Co30Cr10 alloy by using the electromagnetic levitation and splat-quenching.It is found that the alloy generally has a microstructure consisting of a（Co,Cr）-rich phase embedded in a Cu-rich matrix,and the morphology and size of the（Co,Cr）-rich phase vary drastically with cooling rate.During the electromagnetic levitation solidification processing the cooling rate is lower,resulting in an obvious coalescence tendency of the（Co,Cr）-rich spheroids.The（Co,Cr）-rich phase shows dendrites and coarse spheroids at lower cooling rates.In the splat quenched samples the（Co,Cr）-rich phase spheres were refined significantly and no dendrites were observed.This is probably due to the higher cooling rate,undercooling and interface tension.展开更多
Germany and China use different stable systems for fattening pigs. Widespread systems in Germany are closed stables with slatted or partly slatted floor, which produce liquid manure （a mixture of urine, faeces, and c...Germany and China use different stable systems for fattening pigs. Widespread systems in Germany are closed stables with slatted or partly slatted floor, which produce liquid manure （a mixture of urine, faeces, and cleaning water） whereas in China open stables with closed concrete floors are used with separate collection of faeces and urine. Based on data from literature and own analyses nutrient flows of both systems are calculated. The Chinese manure system or mechanized belt or V-shaped pit floor systems with faeces/urine separation are more effective to separate solids, nutrients, carbon, and heavy metal than mechanical separation from liquid manure. The separation rates can be up to 88% for the solids, 67% for nitrogen, 93% for phosphorus, 60% for potassium, 94% for magnesium, 97% for cupper, and 98% for zinc. The faeces can be used for composting to produce a market product.展开更多
基金Projects(51171152,50871088) supported by the National Natural Science Foundation of ChinaProject(20126102110048) supported by Doctoral Fund of Ministry of Education of China+2 种基金Project(SKLSP201202) supported by Foundation of State Key Laboratory of Solidification,ChinaProject(2012JC2-02) supported by Natural Science Basic Research Plan in Shaanxi Province,ChinaProject (JC201268) supported by the NPU Foundation for Fundamental Research,China
文摘Metastable liquid phase separation and rapid solidification in a metastable miscibility gap were investigated on the Cu60Co30Cr10 alloy by using the electromagnetic levitation and splat-quenching.It is found that the alloy generally has a microstructure consisting of a（Co,Cr）-rich phase embedded in a Cu-rich matrix,and the morphology and size of the（Co,Cr）-rich phase vary drastically with cooling rate.During the electromagnetic levitation solidification processing the cooling rate is lower,resulting in an obvious coalescence tendency of the（Co,Cr）-rich spheroids.The（Co,Cr）-rich phase shows dendrites and coarse spheroids at lower cooling rates.In the splat quenched samples the（Co,Cr）-rich phase spheres were refined significantly and no dendrites were observed.This is probably due to the higher cooling rate,undercooling and interface tension.
基金The authors would like to thank the German Ministry for Education and Research （BMBF） （project No. 0330847G）, the National Natural Science Foundation of China （project No. 40971177）, and the Ministry of Science and Technology of the People＇s Republic of China （MOST） for financing the project.
文摘Germany and China use different stable systems for fattening pigs. Widespread systems in Germany are closed stables with slatted or partly slatted floor, which produce liquid manure （a mixture of urine, faeces, and cleaning water） whereas in China open stables with closed concrete floors are used with separate collection of faeces and urine. Based on data from literature and own analyses nutrient flows of both systems are calculated. The Chinese manure system or mechanized belt or V-shaped pit floor systems with faeces/urine separation are more effective to separate solids, nutrients, carbon, and heavy metal than mechanical separation from liquid manure. The separation rates can be up to 88% for the solids, 67% for nitrogen, 93% for phosphorus, 60% for potassium, 94% for magnesium, 97% for cupper, and 98% for zinc. The faeces can be used for composting to produce a market product.
