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高价反离子对氧化铝浆料流变性能的影响
作者:温宁 蔡锴 许杰 余娟丽 李和欣 杨金龙 
单位: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 
关键词:高价反离子 聚沉 黏度 陶瓷浆料 
分类号:TQ174.1+3
出版年,卷(期):页码:2011,39(11):56-60
DOI:
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。

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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.

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基金项目:
国家“863”计划(2010AA03A408)和北京市科技计划(20101- 092117)资助项目
作者简介:
温 宁(1985—),男,硕士研究生
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参考文献:

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