为探索制备低明度热反射颜料的方法,选取不同粒径的硅粉与钛镍黄(Ti Ni Y)混合,再将混合颜料按一定的比例与有机硅树脂混合,制得建筑节能涂料。考察了硅粉粒径及其与钛镍黄的配比对涂层颜色及热反射性能的影响,利用X射线衍射仪、扫描电...为探索制备低明度热反射颜料的方法,选取不同粒径的硅粉与钛镍黄(Ti Ni Y)混合,再将混合颜料按一定的比例与有机硅树脂混合,制得建筑节能涂料。考察了硅粉粒径及其与钛镍黄的配比对涂层颜色及热反射性能的影响,利用X射线衍射仪、扫描电镜、色差仪和紫外/可见光/近红外分光光度计表征了原料的相组成及形貌,以及涂层的Lab色空间值和太阳光反射率。随着硅粉粒径减小,纯硅粉涂层的明度和太阳光反射率均逐渐升高,而混合颜料涂层的明度和太阳光反射率反而降低;随着硅粉含量增加,涂层的明度持续降低,但太阳光反射率下降到一定程度后不再降低。由某市售白色隔热底层(厚1.00 mm)与Ti Ni Y–Si混合颜料涂层(厚0.05 mm)组成的双层结构涂层的近红外反射率由Ti Ni Y–Si混合颜料单层涂层(厚1.00 mm)的42.41%升高到47.93%。可见硅粉能在降低钛镍黄涂层明度的同时,使反射率保持在一个较高的水平,而采用双层热反射涂层结构既可获得低明度,又能维持一定的热反射能力。展开更多
Effects of particle size （A：d50 = 336. 9 μm, B：d50 =123.5μm, C： d50=19.5 μm, D： dso=2.21μm） and content （1 wt% , 3 wt% , 5 wt% , 7 wt% ） of silicon powder on cold crushing strength （CCS） , pore size dis...Effects of particle size （A：d50 = 336. 9 μm, B：d50 =123.5μm, C： d50=19.5 μm, D： dso=2.21μm） and content （1 wt% , 3 wt% , 5 wt% , 7 wt% ） of silicon powder on cold crushing strength （CCS） , pore size distribution and microstructure of Al2O3 - ZrO2 - C refractories coked at high temperature had been investigated by means of mercury porosimeter, SEM, EDS, tic. The results indicated that particle size and content of silicon powder affected the cold crushing strength of coked specimens. It increased with the addition of silicon powder and its finer particle size. However, it decreased greatly when using too fine silicon powder. The particle size and content of silicon powder also impacted the phase evolution and microstructure of coked specimens, much more β-SiC whiskers constituted network structure and well distributed in specimens with reduction of their slenderness ratios when finer silicon powder was added, corresponding to that, the specimens＇ pore size distribution range became narrower with smaller pore diameter, but β-SiC whiskers were distributed sparsely and the specific pore volume of small pores increased when much finer powder was added. It was worthly mentioned that some nitride could form in specimens with addition of appropriate particle size and content of silicon powder.展开更多
文摘为探索制备低明度热反射颜料的方法,选取不同粒径的硅粉与钛镍黄(Ti Ni Y)混合,再将混合颜料按一定的比例与有机硅树脂混合,制得建筑节能涂料。考察了硅粉粒径及其与钛镍黄的配比对涂层颜色及热反射性能的影响,利用X射线衍射仪、扫描电镜、色差仪和紫外/可见光/近红外分光光度计表征了原料的相组成及形貌,以及涂层的Lab色空间值和太阳光反射率。随着硅粉粒径减小,纯硅粉涂层的明度和太阳光反射率均逐渐升高,而混合颜料涂层的明度和太阳光反射率反而降低;随着硅粉含量增加,涂层的明度持续降低,但太阳光反射率下降到一定程度后不再降低。由某市售白色隔热底层(厚1.00 mm)与Ti Ni Y–Si混合颜料涂层(厚0.05 mm)组成的双层结构涂层的近红外反射率由Ti Ni Y–Si混合颜料单层涂层(厚1.00 mm)的42.41%升高到47.93%。可见硅粉能在降低钛镍黄涂层明度的同时,使反射率保持在一个较高的水平,而采用双层热反射涂层结构既可获得低明度,又能维持一定的热反射能力。
文摘Effects of particle size （A：d50 = 336. 9 μm, B：d50 =123.5μm, C： d50=19.5 μm, D： dso=2.21μm） and content （1 wt% , 3 wt% , 5 wt% , 7 wt% ） of silicon powder on cold crushing strength （CCS） , pore size distribution and microstructure of Al2O3 - ZrO2 - C refractories coked at high temperature had been investigated by means of mercury porosimeter, SEM, EDS, tic. The results indicated that particle size and content of silicon powder affected the cold crushing strength of coked specimens. It increased with the addition of silicon powder and its finer particle size. However, it decreased greatly when using too fine silicon powder. The particle size and content of silicon powder also impacted the phase evolution and microstructure of coked specimens, much more β-SiC whiskers constituted network structure and well distributed in specimens with reduction of their slenderness ratios when finer silicon powder was added, corresponding to that, the specimens＇ pore size distribution range became narrower with smaller pore diameter, but β-SiC whiskers were distributed sparsely and the specific pore volume of small pores increased when much finer powder was added. It was worthly mentioned that some nitride could form in specimens with addition of appropriate particle size and content of silicon powder.
