固相含量对淀粉原位凝固成型氧化铝陶瓷工艺中浆料流变性能及坯体性能的影响  

Effects of dispersant amount on rheological property of suspension and characteristics of green body in alumina ceramic forming by esterified starch in-situ consolidation

作　　者：宋贤良[1] 陈玲[2] 叶建东[3] 

机构地区：[1]华南农业大学食品学院,广东广州510640 [2]华南理工大学轻化工研究所,广东广州510640 [3]华南理工大学材料学院,广东广州510640

出　　处：《现代化工》2005年第1期30-32,34,共4页Modern Chemical Industry

基　　金：武器装备预研基金(51412020401JW1601)资助项目

摘　　要：探讨了固相含量对淀粉-Al2O3悬浮浆料的流变特性、固化行为、成型坯体显微结构和性能的影响。通过酯化淀粉原位凝固成型工艺可成型出结构完好、致密度较高的陶瓷坯体。研究表明浆料表观黏度随固相含量的增加而增加,但即使是固相体积分数为58%的高浓悬浮浆料,表观黏度仍小于1mPa·s,易于注模;随固相含量的增加,坯体的线收缩率和干燥强度下降,而坯体的相对密度不断增加;固相含量对坯体的微观结构和气孔分布也有显著影响。The effects of solid volume loading on the rheological behavior and consolidation of alumina suspensions containing esterified starch and the microstructure and properties of the so-formed green bodies are studied. The ceramic green bodies with flawless structure and high relative density were formed by the in-situ consolidation with esterified starch. The results indicate that the apparent viscosity of suspensions increases with the increment of solid volume loading, but even for dense suspension with 58% of volume fraction, the apparent viscosity is less than 1 mPa·s and it is easier to cast. The linear shrinkage and dry strength of green bodies decreases and the relative density increases with the increasing of solid volume loading. The solid volume loading has obvious effect on the microstructure and pore size distribution of bodies.

关 键 词：原位凝固成型 陶瓷坯体 流变性能 工艺 氧化铝陶瓷 型坯 注模 固相含量 影响 增加 

分 类 号：TQ174[化学工程—陶瓷工业] R318.08[化学工程—硅酸盐工业]