The present work aimed to reduce the microstructure heterogeneity inherent to flash sintering by using alumina blankets as a thermal insulator around ZnO cylindrical samples during the sintering process, under different electric field conditions. Thermal insulation significantly reduced the flash onset temperature and the grain size heterogeneity. For higher electric fields, a temperature reduction as high as 480 °C was observed, which also led to lower densification. These findings were discussed in terms of changes in the heat loss dynamics coupled with the adsorbed water retention, both promoted by the applied thermal insulation. A model to estimate the temperature at stage III of flash sintering was proposed. The final temperature reached with thermal insulation did not differ significantly from the ones without it. Thus, thermal insulation could represent an alternative route to flash sinter materials with lower furnace temperatures with energy savings up to 78 % and a more homogeneous microstructure.

目前的工作旨在通过在烧结过程中在不同电场条件下使用氧化铝毯作为 ZnO 圆柱形样品周围的热绝缘体来减少闪烧所固有的微观结构异质性。绝热显着降低了闪光开始温度和晶粒尺寸不均匀性。对于更高的电场，观察到温度降低高达 480 °C，这也导致密度降低。这些发现根据热损失动力学的变化与吸附水保留的变化进行了讨论，两者都由应用的隔热材料促进。提出了一种估算闪蒸第三阶段温度的模型。隔热达到的最终温度与没有隔热的情况没有显着差异。因此，