热处理对电气石矿物粉体表面自由能的影响-硅酸盐学报.PDF

第36 卷第2 期 徐勇军 等：高反射率Ag–Cu 纳米膜玻璃的制备与表征 · 257 · 第36 卷第2 期 硅 酸 盐 学 报 Vol. 36 ，No. 2 2 0 0 8 年 2 月 JOURNAL OF THE CHINESE CERAMIC SOCIETY February ，2008 热处理对电气石矿物粉体表面自由能的影响 梁金生，孟军平，朱东彬，丁 燕，刘志国 (河北工业大学能源与环保材料研究所，天津 300130) 摘 要：将电气石粉体在 500～800 ℃焙烧处理，用表面张力仪测量热处理前后粉体对水、乙醇、30%乙二醇水溶液的接触角，并用Wu 氏方程计算 电气石粉体的表面自由能及组成。用X 射线衍射仪、X 光电子能谱仪等研究热处理影响电气石粉体表面自由能的机理。结果表明：随着热处理温度 升高，电气石粉体的表面自由能及极性分量逐渐增加，且在800 ℃具有最大值；产生这种现象的原因在于随着热处理温度升高，电气石粉体表面铁元 素逐渐从二价向三价转化，其晶胞体积逐渐缩小、电极性增加。 关键词：粉体；电气石；热处理；Wu 氏方程；表面自由能 中图分类号：TH145.1+1 文献标识码：A 文章编号：0454–5648(2008)02–0257–04 EFFECT OF HEAT TREATMENT ON THE SURFACE FREE ENERGY OF MINERAL TOURMALINE POWDERS LIANG Jinsheng ，MENG Junping ，ZHU Dongbin ，DING Yan ，LIU Zhiguo (Institute of Power Source and Ecomaterials Science, Hebei University of Technology, Tianjin 300130, China) Abstract: Mineral tourmaline powders were heat treated at different temperatures from 500 ℃ to 800 ℃. The contact angles of tourmaline powders with water, ethanol and aqueous solution with 30% in mass ethylene glycol were measured. Moreover, the sur- face free energy and its components were calculated according to Wu’s equation. The mechanism by which heat treatment affects the surface free energy was studied by X-ray diffraction and X-ray photoelectron spectroscopy. The results show that the surface free energy and its polar component of tourmaline powders increase with the rise of heat treatment temperature, and reached a maximum at 800 ℃. This phenomenon could be attributed to the reduction of cell volume and the increase of polarity of tourmaline, because the iron element on it