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氧化铪水基浆料的制备及流变性能
作者:曹艳鹏1 2 3 倪德伟2 3 周海军2 3 阚艳梅2 3 董绍明2 3 
单位:1. 上海大学 材料科学与工程学院 上海 200444 2. 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 上海 200050 3. 中国科学院 高性能陶瓷和超微结构国家重点实验室 上海 200050 
关键词:氧化铪 水基浆料 聚乙烯亚胺 流变性能 
分类号:TQ174
出版年,卷(期):页码:2017,45(7):0-0
DOI:10.14062/j.issn.0454-5648.2017.07.07
摘要:

 本文研究了pH值和分散剂聚乙烯亚胺(PEI)质量分数对HfO2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[—CH2–CH2–NH2+—]带电基团,并吸附在HfO2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;HfO2水基浆料的粘度随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HfO2体积分数的增加,浆料粘度呈现逐渐增大的趋势,HfO2体积分数超过30%时,浆料粘度增大尤为显著。通过优化工艺参数,在pH=3、PEI质量分数为0.1%时,可获得HfO2体积分数为30%的低粘度、高稳定性的HfO2水基浆料。采用所制备的HfO2水基浆料浸渍纤维预制体,可获得HfO2体积分数为15%的复合材料。

 

 The effects of pH value and the dispersant polyethyleneimine (PEI) content on the stability and rheological properties of HfO2 aqueous slurry were investigated. The results indicate that, as a cationic dispersant, PEI can combine with H+ to form some charged [—CH2—CH2—NH2+—] groups, which adsorb on the surface of HfO2 particles and make it positively charged. As a result, the pH value at isoelectric point of the slurry increases from 6.2 to 11.2. As PEI added, the viscosity of HfO2 aqueous slurry decreases initially and then increases when the mass fraction of PEI exceeds over 0.1%. Besides, the viscosity of slurry increases with the increase of solid loading, especially when the volume fraction of solid loading is greater than 30%. The HfO2 aqueous slurry with a low viscosity and a highly stability is obtained at pH value of 3, mass fraction of PEI of 0.1%, and solid loading of 30%. A composite with HfO2 volume fraction of 15% is obtained by impregnating the preform using the optimized HfO2 aqueous slurry.

基金项目:
中国科学院率先行动“百人计划”项目。
作者简介:
曹艳鹏(1989―),男,硕士研究生。
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