A novel semisolid continuous Micro Fused-Casting additive manufacturing technology for producing a ZL101 alloy strip was developed, Micro Fused-Casting means that the semisolid metal slurry was pressed out from the ou...A novel semisolid continuous Micro Fused-Casting additive manufacturing technology for producing a ZL101 alloy strip was developed, Micro Fused-Casting means that the semisolid metal slurry was pressed out from the outlet of bottom of crucible to the movable plate. The degree of sub-cooling was easily provided by movement of substrate in the micro fused-casting area. Under the aid of 3 D manufacturing software, the ZL101 alloy strip was solidified and formed layer by layer. The microstructure and properties of ZL101 semisolid slurry were improved by the cooling conditions. The results showed that the ZL101 alloy strip samples fabricated by Micro Fused-Casting had uniform structures and good performances with the substrate movement speed at 20 mm/s and the temperature at 590 ℃, the ultimate tensile strength and elongation of the ZL101 alloy strip reached 242.59 MPa and 7.71%, while the average Vickers hardness was 82.55 HV.展开更多
目的了解不同矫治力作用下大鼠牙齿移动距离及牙根吸收情况，探索应用Micro?CT 研究正畸牙齿移动过程中矫治力对牙根吸收的影响。方法10周龄健康雄性SD大鼠64只（220 ~ 270 g），分别施以10 g（10 g 力组）、30 g 力（130 g 力组）拉右...目的了解不同矫治力作用下大鼠牙齿移动距离及牙根吸收情况，探索应用Micro?CT 研究正畸牙齿移动过程中矫治力对牙根吸收的影响。方法10周龄健康雄性SD大鼠64只（220 ~ 270 g），分别施以10 g（10 g 力组）、30 g 力（130 g 力组）拉右侧上颌第一磨牙向近中移动建立实验动物模型，以对侧同名牙为对照牙。于加力后第3、7、14、28 天处死动物，使用Micro?CT扫描上颌第一磨牙及周围牙槽骨，测量上颌第一磨牙近中移动距离，计算加力28 d上颌第一磨牙近中根的表面凹陷体积，进行统计学分析。结果加力后发生牙齿移动，10 g 力组在加力14 d 内，牙齿移动量小于30 g 力组（P = 0.039），在加力28 d 时大于30 g 力组（P<0.05）。加力28 d，10 g力组、30 g力组的牙根表面凹陷总体积高于对照组（P = 0.004），30 g力组产生的牙根表面凹陷总体积高于10 g力组（P < 0.001）。结论Micro?CT可以对牙齿移动及牙根吸收进行可靠评价及量化分析。加力后28 d，10 g力组移动量较30 g力组大，相应产生牙根吸收较30 g力组少。展开更多
基金Funded by the National Natural Science Foundation of China(No.51341009)
文摘A novel semisolid continuous Micro Fused-Casting additive manufacturing technology for producing a ZL101 alloy strip was developed, Micro Fused-Casting means that the semisolid metal slurry was pressed out from the outlet of bottom of crucible to the movable plate. The degree of sub-cooling was easily provided by movement of substrate in the micro fused-casting area. Under the aid of 3 D manufacturing software, the ZL101 alloy strip was solidified and formed layer by layer. The microstructure and properties of ZL101 semisolid slurry were improved by the cooling conditions. The results showed that the ZL101 alloy strip samples fabricated by Micro Fused-Casting had uniform structures and good performances with the substrate movement speed at 20 mm/s and the temperature at 590 ℃, the ultimate tensile strength and elongation of the ZL101 alloy strip reached 242.59 MPa and 7.71%, while the average Vickers hardness was 82.55 HV.
文摘目的了解不同矫治力作用下大鼠牙齿移动距离及牙根吸收情况，探索应用Micro?CT 研究正畸牙齿移动过程中矫治力对牙根吸收的影响。方法10周龄健康雄性SD大鼠64只（220 ~ 270 g），分别施以10 g（10 g 力组）、30 g 力（130 g 力组）拉右侧上颌第一磨牙向近中移动建立实验动物模型，以对侧同名牙为对照牙。于加力后第3、7、14、28 天处死动物，使用Micro?CT扫描上颌第一磨牙及周围牙槽骨，测量上颌第一磨牙近中移动距离，计算加力28 d上颌第一磨牙近中根的表面凹陷体积，进行统计学分析。结果加力后发生牙齿移动，10 g 力组在加力14 d 内，牙齿移动量小于30 g 力组（P = 0.039），在加力28 d 时大于30 g 力组（P<0.05）。加力28 d，10 g力组、30 g力组的牙根表面凹陷总体积高于对照组（P = 0.004），30 g力组产生的牙根表面凹陷总体积高于10 g力组（P < 0.001）。结论Micro?CT可以对牙齿移动及牙根吸收进行可靠评价及量化分析。加力后28 d，10 g力组移动量较30 g力组大，相应产生牙根吸收较30 g力组少。
