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
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
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
关键词
高价反离子
聚沉
黏度
陶瓷浆料
high valence counter-ions
coagulation
viscosity
ceramic suspension
