利用注浆成型法制备高强度氧化铝陶瓷的研究

发布时间：2018-04-08 19:13

本文选题：氧化铝　切入点：注浆成型　出处：《无机盐工业》2017年09期

【摘要】：研究了使用α-氧化铝微粉作为起始原料,以聚丙烯酸铵(PAA-NH4)为分散剂调配注浆成型用的浆料,采用注浆成型法制备出几乎没有缺陷的生坯,烧制出抗弯强度大于750 MPa的陶瓷体。探讨了分散剂添加量对浆料黏度的影响、浆料特性对生坯特性的影响以及烧结后样品的机械性能。注浆成型用浆料的特性是获得高强度氧化铝陶瓷的关键。经生坯特性(密度与微结构)观察、陶瓷体强度测试及破裂源检测提出一种浆料设计观点,即较佳的高分子分散剂添加量是达到饱和吸附以上但还未开始大量产生分子间架桥作用的浓度范围,此状态的浆料有助于增加粉体粒子之间的黏结,因而有效减少了生坯干燥过程中产生裂缝、缺陷的机率,促使陶瓷体强度得到明显提升。
[Abstract]:Using 伪 -alumina powder as starting material and PAA-NH _ 4) as dispersant, the slurry for grouting molding was prepared. The blank with almost no defects was prepared by grouting molding method, and the ceramic body with bending strength more than 750 MPa was prepared by sintering.The influence of dispersant content on the viscosity of slurry, the influence of slurry characteristics on green properties and the mechanical properties of sintered samples were discussed.The characteristic of grouting material is the key to obtain high strength alumina ceramics.Based on the observation of green properties (density and microstructure), a design viewpoint of slurry is put forward by testing the strength of ceramic body and testing the source of rupture.That is, the optimal amount of polymer dispersant is the concentration range above saturated adsorption but not beginning to produce a large amount of bridging interaction between molecules. The slurry in this state is helpful to increase the adhesion between powder particles.Therefore, the probability of cracks and defects in the drying process is reduced effectively, and the strength of ceramic body is improved obviously.
【作者单位】：恩施职业技术学院;
【基金】：国家自然科学基金项目(51404056) 中央高校基本科研业务费资助(N130402015)
【分类号】：TQ174.6

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