本文通过酸洗工艺对Ｓｉ３Ｎ４粉体进行了表面改性，并研究了表面改性对粉体胶体特性及其浆料流动性的影响．结果表明：酸洗处理之后悬浮粒子的等电点升高，ＸＰＳ表面分析表明这是粉体表面氧化程度降低的缘故．而且，由于酸洗处理有效地提高了粒子的Ｚｅｔａ电位，因而浆料的流动性明显得到改善，其最高固含量也由５０ｖｏｌ．％提高到５５ｖｏｌ．％，并制备出了固含量为５３ｖｏｌ．％的、适于浇注的Ｓｉ３Ｎ４浆料．
Surface modification of Si3N4 particles by acid leaching and its effects on the colloidal behavior and the flow properties of Si3N4 aqueous
slurries were investigated. The experimental results indicate that the isoelectric point of Si3N4 particles shifts to basic region after
modification due to the decreasing of the oxidizing degree on the surface of Si3N4 modified. Because the Zeta potential of Si3N4
particles increases efficiently, the flow properties of Si3N4 modified slurry significantly improve and the maximum solid loading
increases from 50 to 55vol.%. Moreover, the 53vol.% Si3N4 slurry suitable for casting was prepared.
参考文献
| [1] | Omatete O O, Janney M A, Strehlow R A. Am. Ceram. Soc. Bull., 1991, 70 (10): 1641--1649. [2] Gauckler L J, Graule T J. Swiss Pat. 02377, 1992. [3] Cesarano J, Aksay I A. J. Am. Ceram. Soc., 1988, 71 (12): 1062--1067. [4] Guo L-C, Zhang Y, Uchida N, et al. J. Am. Ceram. Soc., 1998, 81 (3): 549--556. [5] Brow R K, Pantano C G. J. Am. Ceram. Soc., 1987, 70 (1): 9--14. [6] Hunter R J. Zeta Potential in Colloid Science---Principles and Applications. New York: Academic Press, 1981. [7] Bergstrom L, Bostedt E. Colloids Surf., 1990, 49: 183--197. [8] Stober W. Adv. Chem. Ser., 1967, 67: 161--172. [9] Denny J J, Robson W D, Irwin D A. Can. Med. Assoc. J., 1939, 40: 213--218. [10] Weber W J, Jr., Stumm W. Inorg. Nucl. Chem., 1965, 27: 237--245. [11] Lewin J C. Geochim. Cosmochim. Acta, 1961, 21: 182--198. [12] Dalton R L, Iler R K. J. Phys. Chem., 1956, 60: 955--957. |
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