丙烯酸在YSZ颗粒表面原位聚合的性能研究

摘要

After the YSZ powder is treated by surface polymerization,the organic compounds of the polymer is completely decomposed when the temperature is above 650℃;the result of HREM indicates that the thickness of surface polymer is about 5nm;after surface polymerization,the isoelectric point of YSZ powder particles shifts from 6.7 to 4.3,the maximum absolute value of Zeta potential can reach around 67mv（at pH10～11）.Surface polymerization is important for the dispersion and stability of YSZ aqueous slurry.Stable,uniform and high solid concentrated tape-casting slurry can be formed from complex binder and YSZ powder particles by surface polymerization.In the cross-section of the tape-cast green sheet,the porosity is well distributed,and the surface of the cast sheet is flat and smooth.The density of the sintered YSZ ceramic substrate is almost 98% of the theoretical density.%YSZ粉体经表面聚合后,当温度大于650℃时,表面聚合物中的有机物完全分解;表征结果为表面聚合的厚度大约在5nm左右;经表面聚合的Y SZ粉体颗粒可使其等电点由6.7移动到4.3左右,最大的Zeta电位绝对值达到67m v左右（pH 10～11时）。经表面聚合作用后,对YSZ水基悬浮体的颗粒的分散和稳定起到了非常重要的作用。将经表面聚合的Y SZ粉体颗粒与复合粘结剂可形成稳定、均匀的高固相含量的流延浆料,其流延生坯片的断面上,气孔分布均匀,流延膜平整、光滑。经烧结后的Y SZ陶瓷基片达到了理论密度的98%。