氧化铪水基浆料的制备及流变性能

发布时间：2018-04-13 15:04

本文选题：氧化铪 + 水基浆料　；参考：《硅酸盐学报》2017年07期

【摘要】：研究了pH值和分散剂聚乙烯亚胺(PEI)质量分数对HfO_2水基浆料稳定性及流变性能的影响。研究表明:PEI作为阳离子型分散剂,在溶剂中与H+结合生成[—CH_2—CH_2—NH_2~+—]带电基团,并吸附在HfO_2颗粒表面,使其带正电;添加PEI后,浆料等电点由pH=6.2升高至pH=11.2;HfO_2水基浆料的黏度随PEI质量分数的增加而减小,但超过0.1%时反而增大;随着浆料中HfO_2体积分数的增加,浆料黏度呈现逐渐增大的趋势,HfO_2体积分数超过30%时,浆料黏度增大尤为显著。通过优化工艺参数,在pH=3、PEI质量分数为0.1%时,可获得HfO_2体积分数为30%的低黏度、高稳定性的HfO_2水基浆料。采用所制备的HfO_2水基浆料浸渍纤维预制体,可获得HfO_2体积分数为15%的复合材料。
[Abstract]:The effects of pH value and mass fraction of dispersant polyimide on the stability and rheological properties of HfO_2 water-based slurry were studied.The results show that as a cationic dispersant, the w / PEI binds with H in solvent to form [-CH2-CH2-NH2-] charged group, which is adsorbed on the surface of HfO_2 particles to make it positively charged.The viscosity of water based slurry decreases with the increase of PEI mass fraction, but increases with the increase of PEI content, and increases with the increase of volume fraction of HfO_2 in the slurry with the increase of the isoelectric point from pH=6.2 to pH 11.2HfO _ 2.When the viscosity of HfO _ 2 is more than 30, the viscosity of slurry increases significantly.By optimizing the process parameters, the low viscosity and high stability HfO_2 water-based slurry with 30% volume fraction of HfO_2 can be obtained when the mass fraction of HfO_2 is 0.1.The composite material with 15% HfO_2 volume fraction can be obtained by impregnating the fiber preform with HfO_2 water-based slurry.
【作者单位】：上海大学材料科学与工程学院;中国科学院上海硅酸盐研究所结构陶瓷与复合材料工程研究中心;高性能陶瓷和超微结构国家重点实验室;
【基金】：中国科学院率先行动“百人计划”项目
【分类号】：TQ174.1

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