During continuous casting,properties of mold flux and mineralogical structures of flux film play important roles in controlling steel quality.The effect of soda ash on the physical properties and crystallization chara...During continuous casting,properties of mold flux and mineralogical structures of flux film play important roles in controlling steel quality.The effect of soda ash on the physical properties and crystallization characteristics of mold flux was investigated using process mineralogy,including polarizing microscopy,X-ray diffraction,and electron microprobe,etc.Mold flux was mainly prepared using cement clinker and industrial mineral materials under laboratory conditions,and the mineralogical structures of the flux film were systematically identified and quantitatively analyzed.The results showed that,by increasing the soda ash content from 10mass% to 18mass%,the crystallization temperature,critical cooling rate and crystallization ratio of the flux film decreased,but the crystallization ratio still reached 75% after adding soda ash,and the mineral compositions and microstructures of the flux film changed slightly.When the soda ash content exceeded 14mass%,the critical cooling rate and the crystallization ratio decreased slightly,whereas the mineral content of the flux film changed evidently,with a large amount of cuspidine precipitation and a significant decrease in the wollastonite content until it reached zero,which resulted in deterioration of the lubrication of the flux film.展开更多
目的:通过检测釉基质蛋白(Enam el m atrix prote ins,EMPs)、骨形成蛋白-2(Bone morphogenetic prote in 2,BMP-2)作用下,牙周膜成纤维细胞矿化能力,探讨EMPs、BMP-2促进牙周组织再生的作用机制。方法:酶消化法获得人牙周膜成纤维细胞(...目的:通过检测釉基质蛋白(Enam el m atrix prote ins,EMPs)、骨形成蛋白-2(Bone morphogenetic prote in 2,BMP-2)作用下,牙周膜成纤维细胞矿化能力,探讨EMPs、BMP-2促进牙周组织再生的作用机制。方法:酶消化法获得人牙周膜成纤维细胞(Hum an periodontal ligam ent cells,HPDLC)用不同因子进行诱导,在3d、7d两个时间点,利用ALP法检测诱导后细胞成骨活性的变化,同时进行体外矿化诱导实验。结果:BMP-2促进了PDLCs的矿化能力;EMPs作用不明显;同时,在BMP-2和EMPs作用下,PDLCs形成矿化结节,但EMPs结节细小,进展慢。结论:BMP-2是一种骨诱导因子;EMPs是一种成骨促进因子。展开更多
基金Item Sponsored by National Natural Science Foundation of China(51174073)National Natural Science Foundation-National Iron and Steel Joint Research of China(U1360106)
文摘During continuous casting,properties of mold flux and mineralogical structures of flux film play important roles in controlling steel quality.The effect of soda ash on the physical properties and crystallization characteristics of mold flux was investigated using process mineralogy,including polarizing microscopy,X-ray diffraction,and electron microprobe,etc.Mold flux was mainly prepared using cement clinker and industrial mineral materials under laboratory conditions,and the mineralogical structures of the flux film were systematically identified and quantitatively analyzed.The results showed that,by increasing the soda ash content from 10mass% to 18mass%,the crystallization temperature,critical cooling rate and crystallization ratio of the flux film decreased,but the crystallization ratio still reached 75% after adding soda ash,and the mineral compositions and microstructures of the flux film changed slightly.When the soda ash content exceeded 14mass%,the critical cooling rate and the crystallization ratio decreased slightly,whereas the mineral content of the flux film changed evidently,with a large amount of cuspidine precipitation and a significant decrease in the wollastonite content until it reached zero,which resulted in deterioration of the lubrication of the flux film.
文摘目的:通过检测釉基质蛋白(Enam el m atrix prote ins,EMPs)、骨形成蛋白-2(Bone morphogenetic prote in 2,BMP-2)作用下,牙周膜成纤维细胞矿化能力,探讨EMPs、BMP-2促进牙周组织再生的作用机制。方法:酶消化法获得人牙周膜成纤维细胞(Hum an periodontal ligam ent cells,HPDLC)用不同因子进行诱导,在3d、7d两个时间点,利用ALP法检测诱导后细胞成骨活性的变化,同时进行体外矿化诱导实验。结果:BMP-2促进了PDLCs的矿化能力;EMPs作用不明显;同时,在BMP-2和EMPs作用下,PDLCs形成矿化结节,但EMPs结节细小,进展慢。结论:BMP-2是一种骨诱导因子;EMPs是一种成骨促进因子。