SA对Al_2O_3粉体改性作用机制及注射成型工艺研究

Study on the Modification Mechanism of Stearic Acid to Alumina Powder and Process of Ceramic Injection Molding

研究了硬脂酸(SA)的加入方式对注射成型工艺的影响,探讨了SA对氧化铝粉末改性作用机制、对喂料性能和注射性能的影响,并对注射成型工艺过程中容易引起的缺陷进行了分析.结果表明:用球磨法对陶瓷粉末进行表面改性处理,可改善陶瓷颗粒表面、有机黏结剂的相容性及分散性、喂料的均匀性和注射性能,有利于提高注射坯体质量、烧结体的密度和强度.

In this paper, the effect of adding molde of stearic acid on the injection molding process were studied, the modification mechanism of stearic acid to alumina powder as well as the influence of the performance of the feeding and injection were discussed. In addition, the defects of being easy to the introduction in injection molding products were sum- marized. The results showed that the surface of the alumina powder was firstly modified by stearic acid to reduce the aggre- gates and the compatibility, dispersibility, the uniformity of feedstock and injection property were improved by this process. The density and three-bending strength of the sintered samples were improved.