通过分散聚合法制备出聚苯乙烯微球,并以此为胶晶模板,合成了三维有序大孔单金属氧化物TiO2(3 DOM TiO2)和双金属氧化物Fe1Mn4Ox(3 DOM Fe1Mn4Ox)。利用氮气吸附(BET),扫描电子显微镜(SEM),傅里叶变换红外光谱(FTIR)等分析方法表征了合...通过分散聚合法制备出聚苯乙烯微球,并以此为胶晶模板,合成了三维有序大孔单金属氧化物TiO2(3 DOM TiO2)和双金属氧化物Fe1Mn4Ox(3 DOM Fe1Mn4Ox)。利用氮气吸附(BET),扫描电子显微镜(SEM),傅里叶变换红外光谱(FTIR)等分析方法表征了合成样品的性质及结构,并用含硫量为600 mg/L的模拟柴油(正辛烷+噻吩)对合成样品的吸附脱硫性能进行了测试。结果表明,合成的3 DOM TiO2具有(500±20)nm的大孔和2.4 nm的介孔,3 DOM Fe1Mn4Ox具有(450±10)nm的大孔和2.8 nm的介孔;TiO2,Fe1Mn4Ox的穿透硫容量分别为4.68,1.83 mg/g;TiO2经2次硫化再生后其穿透硫容量仍可达到新鲜样品的92.3%。展开更多
The microstructure revolution and mechanical properties of as-extruded and peak-aged Mg−6Zn−1Mn−4Sn−0.5Ca(ZMT614−0.5Ca)alloy were studied by OM,SEM,TEM,hardness testing and tensile testing.The results showed that the ...The microstructure revolution and mechanical properties of as-extruded and peak-aged Mg−6Zn−1Mn−4Sn−0.5Ca(ZMT614−0.5Ca)alloy were studied by OM,SEM,TEM,hardness testing and tensile testing.The results showed that the as-cast ZMT614−0.5Ca alloy mainly consisted of α-Mg,Mg−Zn and CaMgSn phase.The hot extrusion process effectively refined the microstructure and led to a completely dynamic recrystallized microstructure.The average grain size of as-extruded alloy was^4.85μm.After solution treatment,remained CaMgSn with high melting point played a significant role in pinning effect and impeding the migration of grain boundary.After aging treatment,peak-aged ZMT614−0.5Ca alloy exhibited a good combination of strength and ductility,with yield strength,ultimate tensile strength and elongation being 338 MPa,383 MPa and 7.5%,respectively.The yield strength of the alloy increased significantly by around 36%compared with that in as-extruded condition,which should be attributed to the precipitation strengthening of β'phase.展开更多
The Sr/F co-doped CaP(Sr/F-CaP)coatings were prepared by micro-arc oxidation(MAO)under different voltages to modify the microstructure and corrosion behavior of Mg-4Zn-1Mn alloy.The surface and interface characteristi...The Sr/F co-doped CaP(Sr/F-CaP)coatings were prepared by micro-arc oxidation(MAO)under different voltages to modify the microstructure and corrosion behavior of Mg-4Zn-1Mn alloy.The surface and interface characteristics investigated using scanning electron microscopy(SEM)and energy dispersive X-ray spectrometer(EDS)showed that the MAO coatings displayed uneven crater-like holes and tiny cracks under lower voltage,while they exhibited relatively homogeneous crater-like holes without cracks under higher voltage.The thickness of MAO coatings increased with increasing voltage.The corrosion behavior of Mg-4Zn-1Mn alloy was improved by the MAO coatings.The MAO coatings prepared under 450 V and 500 V voltages possessed the best corrosion resistance with regard to the electrochemical corrosion tests and immersion corrosion tests,respectively.The MAO coatings fabricated under 450-500 V could provide a better corrosion protection effect for the substrate.展开更多
文摘通过分散聚合法制备出聚苯乙烯微球,并以此为胶晶模板,合成了三维有序大孔单金属氧化物TiO2(3 DOM TiO2)和双金属氧化物Fe1Mn4Ox(3 DOM Fe1Mn4Ox)。利用氮气吸附(BET),扫描电子显微镜(SEM),傅里叶变换红外光谱(FTIR)等分析方法表征了合成样品的性质及结构,并用含硫量为600 mg/L的模拟柴油(正辛烷+噻吩)对合成样品的吸附脱硫性能进行了测试。结果表明,合成的3 DOM TiO2具有(500±20)nm的大孔和2.4 nm的介孔,3 DOM Fe1Mn4Ox具有(450±10)nm的大孔和2.8 nm的介孔;TiO2,Fe1Mn4Ox的穿透硫容量分别为4.68,1.83 mg/g;TiO2经2次硫化再生后其穿透硫容量仍可达到新鲜样品的92.3%。
基金Project(2016YFB0301101)supported by the National Key Research and Development Program of ChinaProjects(51571040,U1764253,51531002)supported by the National Natural Science Foundation of China。
文摘The microstructure revolution and mechanical properties of as-extruded and peak-aged Mg−6Zn−1Mn−4Sn−0.5Ca(ZMT614−0.5Ca)alloy were studied by OM,SEM,TEM,hardness testing and tensile testing.The results showed that the as-cast ZMT614−0.5Ca alloy mainly consisted of α-Mg,Mg−Zn and CaMgSn phase.The hot extrusion process effectively refined the microstructure and led to a completely dynamic recrystallized microstructure.The average grain size of as-extruded alloy was^4.85μm.After solution treatment,remained CaMgSn with high melting point played a significant role in pinning effect and impeding the migration of grain boundary.After aging treatment,peak-aged ZMT614−0.5Ca alloy exhibited a good combination of strength and ductility,with yield strength,ultimate tensile strength and elongation being 338 MPa,383 MPa and 7.5%,respectively.The yield strength of the alloy increased significantly by around 36%compared with that in as-extruded condition,which should be attributed to the precipitation strengthening of β'phase.
文摘The Sr/F co-doped CaP(Sr/F-CaP)coatings were prepared by micro-arc oxidation(MAO)under different voltages to modify the microstructure and corrosion behavior of Mg-4Zn-1Mn alloy.The surface and interface characteristics investigated using scanning electron microscopy(SEM)and energy dispersive X-ray spectrometer(EDS)showed that the MAO coatings displayed uneven crater-like holes and tiny cracks under lower voltage,while they exhibited relatively homogeneous crater-like holes without cracks under higher voltage.The thickness of MAO coatings increased with increasing voltage.The corrosion behavior of Mg-4Zn-1Mn alloy was improved by the MAO coatings.The MAO coatings prepared under 450 V and 500 V voltages possessed the best corrosion resistance with regard to the electrochemical corrosion tests and immersion corrosion tests,respectively.The MAO coatings fabricated under 450-500 V could provide a better corrosion protection effect for the substrate.
