采用机械球磨涂覆技术在1mm氧化锆球体上制备钛涂层,研究了球料比、球磨时间及球磨气氛对钛涂层形成的影响,利用扫描电子显微镜(scanning electron microscope,SEM)、X射线衍射(X-ray diffraction,XRD)及超声波对钛涂层的显微结构及物...采用机械球磨涂覆技术在1mm氧化锆球体上制备钛涂层,研究了球料比、球磨时间及球磨气氛对钛涂层形成的影响,利用扫描电子显微镜(scanning electron microscope,SEM)、X射线衍射(X-ray diffraction,XRD)及超声波对钛涂层的显微结构及物理性能进行了表征。结果表明,钛涂层厚度随球磨时间、球料比的增加先增加后减小,球磨30 h的涂层平均厚度最大,约为76μm,球料比2.5:1.0的涂层平均厚度最大,约为73μm;钛涂层结合强度随球磨时间的增加先增加后减小;球磨过程中适当增加球料比,可缩短涂层的形成时间;在球磨过程中间歇性引入空气,球磨罐中的钛粉易被氧化成TiO,导致涂层形成困难,故而球磨过程处于密封状态更有利于钛涂层的形成。展开更多
Wax-coated sands are a new category of synthetic soils, which are gradually becoming a reliable construction material. Because of their valuable drainage ability and mechanical properties, wax coated sandy soils are s...Wax-coated sands are a new category of synthetic soils, which are gradually becoming a reliable construction material. Because of their valuable drainage ability and mechanical properties, wax coated sandy soils are specifically applicable to pavement construction of horseracing tracks and sport fields. Although the mechanical and hydraulic properties of these synthetic soils are well-proven, there is still a lack of studies on how the soil samples behave differently when mixing with different wax fractions. Adding the wax affects permeability and compressibility of pure sand. Intensity of influences is a function of weight percentage of wax that has been added, and other physical and environmental factors. The effects of wax content on hydraulic properties(permeability), and mechanical properties(stress strain behavior, compressibility) of sandy soils based on a series of experimental efforts were investigated. Obtained experimental results infer that increasing the amount of wax up to 6% causes an about 50% increase in permeability, mainly because of the significant effect of wax in lowering the friction along with covering and filling the angular parts of particles' surfaces and forming rounded particles. In addition, wax-coated sands show a 20% to 60% decrease in confined compression modulus compared to non wax-coated sands.展开更多
文摘采用机械球磨涂覆技术在1mm氧化锆球体上制备钛涂层,研究了球料比、球磨时间及球磨气氛对钛涂层形成的影响,利用扫描电子显微镜(scanning electron microscope,SEM)、X射线衍射(X-ray diffraction,XRD)及超声波对钛涂层的显微结构及物理性能进行了表征。结果表明,钛涂层厚度随球磨时间、球料比的增加先增加后减小,球磨30 h的涂层平均厚度最大,约为76μm,球料比2.5:1.0的涂层平均厚度最大,约为73μm;钛涂层结合强度随球磨时间的增加先增加后减小;球磨过程中适当增加球料比,可缩短涂层的形成时间;在球磨过程中间歇性引入空气,球磨罐中的钛粉易被氧化成TiO,导致涂层形成困难,故而球磨过程处于密封状态更有利于钛涂层的形成。
文摘Wax-coated sands are a new category of synthetic soils, which are gradually becoming a reliable construction material. Because of their valuable drainage ability and mechanical properties, wax coated sandy soils are specifically applicable to pavement construction of horseracing tracks and sport fields. Although the mechanical and hydraulic properties of these synthetic soils are well-proven, there is still a lack of studies on how the soil samples behave differently when mixing with different wax fractions. Adding the wax affects permeability and compressibility of pure sand. Intensity of influences is a function of weight percentage of wax that has been added, and other physical and environmental factors. The effects of wax content on hydraulic properties(permeability), and mechanical properties(stress strain behavior, compressibility) of sandy soils based on a series of experimental efforts were investigated. Obtained experimental results infer that increasing the amount of wax up to 6% causes an about 50% increase in permeability, mainly because of the significant effect of wax in lowering the friction along with covering and filling the angular parts of particles' surfaces and forming rounded particles. In addition, wax-coated sands show a 20% to 60% decrease in confined compression modulus compared to non wax-coated sands.
