新型环保铝镁硼复合磷酸盐热硬砂固化工艺研究

Curing Technology of New Environmental Al-Mg-B Compound Phosphate Heat Cured Sand

研究了铝镁硼复合磷酸盐热硬砂的固化工艺、溃散性及其发气性。结果表明,低温固化有利于获得高的干强度,但存放稳定性很差;但过高的固化温度对干强度和存放稳定性都不利。铝镁硼复合磷酸盐热硬砂最佳固化工艺加热温度为200℃,加热时间为30 min～40 min。该热硬砂具有良好的溃散性和低的发气量。

Curing technology, collapsibility and gas evolution of Al-Mg-B compound phosphate heat cured sand were studied. It is revealed that low curing temperature is beneficial to obtain high dry strength, but humidity resistance is bad, but over high curing temperature goes against dry strength and humidity resistance. Best curing technology of this heat cured sand is under the 200 ℃ for 30 min-40 min. At the same time, this sand has good collapsibility and low gas evolution.