The influence of solvent and the rate of addition of water on the characteristics of alumina-zirconia powders obtained by sol-gel method were investigated. The Al2O3-ZrO2 powders (1:1 molar ratio) were prepared using ...The influence of solvent and the rate of addition of water on the characteristics of alumina-zirconia powders obtained by sol-gel method were investigated. The Al2O3-ZrO2 powders (1:1 molar ratio) were prepared using aluminum tri-sec-butoxide and zirconium n-propoxide as precursors. Ethanol (EtOH), isopropanol (iPrOH) and isobutanol (iBuOH) were used as solvents. The Al2O3-ZrO2 powders were characterized by nitrogen physisorption (SBET), Fourier transformed infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), differential thermal analysis (DTA), X-ray diffraction (XRD) and scanning electron microscopy (SEM). Prepared oxides calcined at 700℃ showed high specific surface area (200 - 240 m2/g). Obtained results suggest that the homogeneity of the mixed oxides is favored by using a water addition rate of 0.06 and 0.10 mL/min with ethanol as solvent.展开更多
通过溶胶-凝胶法合成了硅酸锆包裹氧化改性炭黑(Zr Si O4/C)色料,采用XRD、色度仪和TEM等分析手段对色料进行表征。研究了改性C的球磨方式、溶剂种类和成型压力等工艺因素对Zr Si O4合成及Zr Si O4/C色料色度的影响规律。结果表明:着色...通过溶胶-凝胶法合成了硅酸锆包裹氧化改性炭黑(Zr Si O4/C)色料,采用XRD、色度仪和TEM等分析手段对色料进行表征。研究了改性C的球磨方式、溶剂种类和成型压力等工艺因素对Zr Si O4合成及Zr Si O4/C色料色度的影响规律。结果表明:着色剂C粉的形貌对包裹色料的色度影响明显,手磨过筛后的C粉呈颗粒状,分布均匀,制得的色料黑度较高,而经过振动球磨后的C呈絮状,不宜进行包裹;水溶剂会导致异质聚合Si-O-Zr键断裂,形成同质聚合,不利于包裹体Zr Si O4的低温合成,从而影响色料的呈色;过高的成型压力阻碍了Zr Si O4合成过程中的Si F4气相传质,影响了Zr Si O4的正常生长,不利于炭黑包裹和色料的发色。展开更多
文摘The influence of solvent and the rate of addition of water on the characteristics of alumina-zirconia powders obtained by sol-gel method were investigated. The Al2O3-ZrO2 powders (1:1 molar ratio) were prepared using aluminum tri-sec-butoxide and zirconium n-propoxide as precursors. Ethanol (EtOH), isopropanol (iPrOH) and isobutanol (iBuOH) were used as solvents. The Al2O3-ZrO2 powders were characterized by nitrogen physisorption (SBET), Fourier transformed infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), differential thermal analysis (DTA), X-ray diffraction (XRD) and scanning electron microscopy (SEM). Prepared oxides calcined at 700℃ showed high specific surface area (200 - 240 m2/g). Obtained results suggest that the homogeneity of the mixed oxides is favored by using a water addition rate of 0.06 and 0.10 mL/min with ethanol as solvent.
文摘通过溶胶-凝胶法合成了硅酸锆包裹氧化改性炭黑(Zr Si O4/C)色料,采用XRD、色度仪和TEM等分析手段对色料进行表征。研究了改性C的球磨方式、溶剂种类和成型压力等工艺因素对Zr Si O4合成及Zr Si O4/C色料色度的影响规律。结果表明:着色剂C粉的形貌对包裹色料的色度影响明显,手磨过筛后的C粉呈颗粒状,分布均匀,制得的色料黑度较高,而经过振动球磨后的C呈絮状,不宜进行包裹;水溶剂会导致异质聚合Si-O-Zr键断裂,形成同质聚合,不利于包裹体Zr Si O4的低温合成,从而影响色料的呈色;过高的成型压力阻碍了Zr Si O4合成过程中的Si F4气相传质,影响了Zr Si O4的正常生长,不利于炭黑包裹和色料的发色。
