羟基化对Si_3N_4粉体水相分散性的影响（英文）

Effects of Hydroxyl Groups on Dispersibility of Silicon Nitride Powder in Aqueous Media

通过施加硝酸有效地使氮化硅(Si_3N_4)粉末的表面羟基化,以改善在水性介质中的分散性。与天然粉末相比,羟基化粉末在水性介质中产生更稳定的胶体分散。傅里叶变换红外光谱和X射线光电子能谱结果表明,随着羟基改性,Si_3N_4粉末的羟基含量显著增加。这有助于防止Si_3N_4粉末在水性介质中聚集。此外,热重分析表明羟基化Si_3N_4粉末的羟基含量比天然粉末高68.8%。Si_3N_4粉末的表面亲水性通过羟基改性而增强,并且粉末分散性随着羟基含量的增加而提高。

The surface of silicon nitride(Si3N4)powder was efficiently hydroxylated via application of nitric acid to improve dispersibility in aqueous media.Hydroxylated powder results in more stable colloidal dispersion in aqueous media compared to native powder.Results of Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy show that hydroxyl group content of Si3N4 powder significantly increased with hydroxyl modification.This is helpful in preventing Si3N4 powder from aggregating in aqueous media.In addition,thermogravimetric analysis indicates that hydroxyl group content of hydroxylated Si3N4 powder was 68.8%higher than that of native powder.Furthermore,surface hydrophilicity of Si3N4 powder is enhanced with hydroxyl modification,and powder dispersibility is improved with an increase in hydroxyl content.