针对Na_(2)O-CaO-SiO_(2)(NCS)多孔微晶玻璃内部气孔大小不同、分布不均问题,提出通过添加固态Si颗粒调控NCS多孔微晶玻璃孔结构。通过扫描电子显微镜(SEM)、图像处理软件Image pro plus 6.0、DSC等分析手段研究固态Si颗粒对NCS多孔微...针对Na_(2)O-CaO-SiO_(2)(NCS)多孔微晶玻璃内部气孔大小不同、分布不均问题,提出通过添加固态Si颗粒调控NCS多孔微晶玻璃孔结构。通过扫描电子显微镜(SEM)、图像处理软件Image pro plus 6.0、DSC等分析手段研究固态Si颗粒对NCS多孔微晶玻璃内部热场、液相的影响,以及Si颗粒调控NCS多孔微晶玻璃气泡成核机制。结果表明,通过加入固态Si颗粒可以使NCS多孔微晶玻璃基础配合料内部热扩散速率提高23.5%,NCS多孔微晶玻璃内部液相产生温度降低60℃,液相产生速率增大7~8倍;在固态Si颗粒周围先产生液相,液相中的气泡分子在固态Si颗粒表面非均相成核,随着配合料温度的升高,无固态Si颗粒位置处产生新的液相,液相中气泡分子扩散至固态Si颗粒表面促进原始气泡长大或者在新液相中均相成核。展开更多
A mechanical vibration technique to refine solidified microstructure was reported. Vibration energy was directly introduced into a molten alloy by a vibrating horn, and the vibrating horn was melted during vibration. ...A mechanical vibration technique to refine solidified microstructure was reported. Vibration energy was directly introduced into a molten alloy by a vibrating horn, and the vibrating horn was melted during vibration. Effects of vibration acceleration and mass ratio on the microstructure of Al-5% Cu alloy were investigated. Results show that the present mechanical vibration could provide localized cooling by extracting heat from the interior of molten alloy, and the cooling rate is strongly dependent on vibration acceleration. It is difficult to refine the solidified microstructure when the treated alloy keeps full liquid state within the entire vibrating duration. Significantly refined microstructure was obtained by applying mechanical vibration during the initial stage of solidification. Moreover, mechanisms of grain refinement were discussed.展开更多
文摘针对Na_(2)O-CaO-SiO_(2)(NCS)多孔微晶玻璃内部气孔大小不同、分布不均问题,提出通过添加固态Si颗粒调控NCS多孔微晶玻璃孔结构。通过扫描电子显微镜(SEM)、图像处理软件Image pro plus 6.0、DSC等分析手段研究固态Si颗粒对NCS多孔微晶玻璃内部热场、液相的影响,以及Si颗粒调控NCS多孔微晶玻璃气泡成核机制。结果表明,通过加入固态Si颗粒可以使NCS多孔微晶玻璃基础配合料内部热扩散速率提高23.5%,NCS多孔微晶玻璃内部液相产生温度降低60℃,液相产生速率增大7~8倍;在固态Si颗粒周围先产生液相,液相中的气泡分子在固态Si颗粒表面非均相成核,随着配合料温度的升高,无固态Si颗粒位置处产生新的液相,液相中气泡分子扩散至固态Si颗粒表面促进原始气泡长大或者在新液相中均相成核。
基金Project(50804023)supported by the National Natural Science Foundation of ChinaProject(GJJ12032)supported by the Education Department of Jiangxi Province,China+1 种基金Project(20122BAB206021)supported by the Natural Science Foundation of Jiangxi Province,ChinaProject(20122BCB23001)supported by the Jiangxi Province Young Scientists Cultivating Programs,China
文摘A mechanical vibration technique to refine solidified microstructure was reported. Vibration energy was directly introduced into a molten alloy by a vibrating horn, and the vibrating horn was melted during vibration. Effects of vibration acceleration and mass ratio on the microstructure of Al-5% Cu alloy were investigated. Results show that the present mechanical vibration could provide localized cooling by extracting heat from the interior of molten alloy, and the cooling rate is strongly dependent on vibration acceleration. It is difficult to refine the solidified microstructure when the treated alloy keeps full liquid state within the entire vibrating duration. Significantly refined microstructure was obtained by applying mechanical vibration during the initial stage of solidification. Moreover, mechanisms of grain refinement were discussed.
