高价反离子对氧化铝浆料流变性能的影响(英文)  

Influence of High Valence Counter-ions on Rheological Properties of Alumina Suspension

作　　者：温宁[1] 蔡锴[1] 许杰[1] 余娟丽[1] 李和欣[1] 杨金龙[1] 

机构地区：[1]清华大学材料科学与工程系,新型陶瓷与精细工艺国家重点实验室,北京100084

出　　处：《硅酸盐学报》2011年第11期1768-1772,共5页Journal of The Chinese Ceramic Society

基　　金：国家“863”计划(2010AA03A408);北京市科技计划(20101-092117)资助项目

摘　　要：以柠檬酸铵为分散剂,在50%(体积分数)的氧化铝浆料中分别加入2价的Ca2+、Mg2+、Cu2+和3价的Al3+、Y3+、Cr3+、Fe3+,系统研究了高价反离子对氧化铝浆料流变性能的影响。结果表明:高价反离子添加量超过浆料临界聚沉浓度后,浆料黏度显著增加,近于固化。2价Ca2+、Mg2+和Cu2+对浆料的聚沉作用优于3价的Al3+、Y3+、Cr3+和Fe3+,与Schulze–Hardy法则并不一致,这主要是由于3价离子与浆料中OH?和柠檬酸根离子反应减小了其对浆料的聚沉作用。与其它2价离子相比,Ca2+的临界聚沉浓度较低,且黏度突变较大。高价反离子的临界聚沉浓度随浆料中分散剂用量增加而增加,随浆料固相含量增加而降低。高价反离子对浆料有较强的聚沉能力,可显著提高浆料黏度,为通过缓释离子直接引发固化提供了可能。Effect of high valence counter-ions（HVCIs） on rheological properties of alumina suspensions was investigated via the addition of bivalent ions（Ca2＋,Mg2＋ and Cu2＋） and trivalent ions（Al3＋,Y3＋,Cr3＋,and Fe3＋） into alumina suspensions of 50%（volume fraction） with ammonium citrate as a dispersant,respectively.The results show that the viscosity of suspension increases when the HVCIs addition is higher than the critical coagulation concentration（CCC）.The bivalent ions such as Ca2＋,Mg2＋ and Cu2＋ produced the coagulation in the ceramic suspensions more effectively,compared to the trivalent ions of Al3＋,Y3＋,Cr3＋ and Fe3＋,which was inconsistent with the Schulze–Hardy rule.This was mainly because the most of trivalent ions reacted with OH-and citrate,decreasing the coagulation behavior.Compared to other bivalent ions,Ca2＋ had a lower CCC and an increased viscosity.The CCC of HVCIs increased with increasing the amount of dispersant and decreased with increasing the solids content of suspension.The HVCIs led to a strong coagulation and an increased viscosity of the suspension,which could be promising for the effective ceramic solidification

关 键 词：高价反离子 聚沉 黏度 陶瓷浆料 

分 类 号：TQ174.13[化学工程—陶瓷工业]