PVA对钙长石–氧化铝多孔隔热材料的影响

Impact of PVA on the Heat-Insulation Performance of Anorthite-Alumina Porous Insulation Materials

摘要: 本文以聚乙烯醇(PVA)溶液作为粘结剂，研究其对钙长石–氧化铝多孔隔热材料性能及显微结构的影响，并确定聚乙烯醇(PVA)溶液的适宜掺量。研究结果表明：随着PVA量的增加，钙长石–氧化铝多孔隔热材料的体积密度在1.52 g/cm³~1.54 g/cm³，线收缩率在2.25%~2.50%，显气孔率由66.55%下降到58.51%；由显微结构SEM观察可知，随着PVA量的增加，晶粒间粘结作用增强，聚集体相互间粘结的颈部增大，聚集体有增大趋势，气孔逐渐清晰且均匀，但是晶粒的大小和形状并未发生明显变化；由材料的热震分析可知，加入PVA后，由于材料温度梯度的减小而使抗热震性次数有所提高，材料的热震性能良好。

Abstract: Polyvinyl alcohol (PVA) solution as binder, study the influence of the anorthite-alumina insulation material properties and microstructure, and to determine the appropriate content of polyvinyl alcohol (PVA) solution. The results show that: with the increase in the amount of binder PVA, anorthite-alumina insulation material bulk density of 1.52 g/cm³,1.54 g/cm³ linear shrinkage of 2.25% to 2.50%, the apparent porosity decreased from 66.55% to 58.51%; SEM observation shows that, with the increase in the amount of binder PVA, the enhanced role of the inter-granular bonding while enhancing the role of bonding between the aggregates and aggregates between the neck increases aggregates increases gradually clear pores and homogenization, but the grain size and shape has not changed; anorthite-alumina thermal shock analysis shows that the material with PVA have well thermal shock resistance, due to lower temperature gradient improving the thermal shock.