SiC粉体表面乙酸的吸附与其浆料流变性研究

Research on the Adsorption of Acetic Acid on the Surface of SiC Powder and Its Slurry Rheology

针对大分子有机改性剂易造成SiC浆料黏度升高的问题,探索采用乙酸、乙醇等小分子有机物在溶剂热环境中与SiC粉体相互作用的可行性。考察小分子极性有机物在粉体表面的吸附状态,以及粉体在水相中的分散稳定性和流变性能。TOC(总有机碳)测试表明,经过120℃溶剂热处理后,乙酸分子牢固地吸附于SiC粉体表面,增加了表面疏水性减少了粉体与水的结合,同时Zeta电位得到了进一步的提高,pH值10.2时为-67.7 mV。与原始粉体相比,用乙酸溶剂热处理后的SiC粉体所制备的固含量为35 vol%的浆料,黏度低、流变性好。

In view of the problem that macromolecular organic modifiers can easily increase the viscosity of Si slurry,the possibility of using small molecular organic compounds such as acetic acid or ethanol to interact with SiC powder in a solvothermal environment was explored in this paper.The adsorption of small molecular polar organics on the powder surface,as well as the dispersion stability and rheological properties of powders in the water phase were studied.TOC(total organic carbon)test showed that after solvothermal treatment at 12o℃,acetic acid was firmly adsorbed on the surface of SiC powder,which increased the hydrophobicity of particles and reduced the combination of powder and water.At the same time,the Zeta potential of SiC powder was further increased to-67.7 mV at pH 10.2.Compared with the original powder,the slurry with 35vol%solid content prepared by acetic acid-Sic powder has lower viscosity and good rheology.