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高价反离子对氧化铝浆料流变性能的影响

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Abstract:

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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