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原始钡铁氧体粒子经过行星磨磨细后 ,粒子平均尺寸由 8.2 9μm减小为 3.6 6 μm ,而比表面积由 2 .5 8m2 /g增大到 5 .84m2 / g ,相应地零电位点 (IEP)由pH6 .2～pH6 .5提高到 pH8～pH9。结果使得磨细粉制成的水基悬浊液 ,在酸碱度被调节到pH3.5或更低时 ,获得最高的Zeta电位。采用磨细的钡铁氧体粉末 ,添加非离子型高分子表面活性剂PEG和蒸馏水 ,并调低pH值 ,经高速混合、机械搅拌后 ,可以制备成用于注浆成形的稳定的钡铁氧体水基浆料。研究表明 ,粒子间的静电排斥力对钡铁氧体粒子在水中的分散仍起主导作用 ;而吸附在粒子表面的PEG只相当于一个绝缘层 ,从而机械地隔开了粒子 ,改进分散性能。通过对浆料粘性的测定 ,优化了浆料的配比。
The original barium ferrite particles after planetary grinding fine particles average size decreased from 8.29μm to 3.6 6μm, and the specific surface area increased from 2. 58m2 / g to 5.84m2 / g, the corresponding zero point (IEP) from pH6. 2 ~ pH6. 5 to pH8 ~ pH9. As a result, the water-based suspension made of ground powder attains the highest Zeta potential when the pH is adjusted to pH 3.5 or lower. Barium ferrite powder with a fine, add non-ionic polymer surfactant PEG and distilled water, and lower the pH value, high-speed mixing, mechanical stirring, can be prepared for the formation of stable barium iron Oxygen water-based slurry. Studies have shown that the electrostatic repulsion between particles still plays a dominant role in the dispersion of barium ferrite particles in water, while the PEG adsorbed on the surface of the particles only acts as an insulating layer, thus mechanically separating the particles and improving the dispersion performance. Through the determination of the viscosity of the slurry, the proportion of the slurry is optimized.