Microwave Pressing is a promising way to reduce microwave sintering temperatures and stabilize microwave powder materials processing. A multi-physics simulation was conducted of the regulated pressure-assisted microwave cavity. This simulation took into consideration resonance phenomena and the nonlinear temperature-dependent material parameters of zirconia. The intrinsic behaviors of microwave systems and zirconia make the regulation of the microwave pressing difficult. However, the same phenomena can be used to activate flash sintering. Flash microwave sintering uses high electric fields of the resonant microwave profile, the Negative Temperature Behavior (NTC) of zirconia resistivity, and the mechanical pressure applied to the powder via a die compaction configuration. The resulting flash microwave pressing still needs improvement in terms of the processed material structure homogeneity, but it has the capacity to become the fastest sintering treatment as it allows room temperature activation where the total process time only takes a few seconds. In addition, this 10-20s processing technique has shown good potential for improving the transparency of alumina pre-sintered specimens.

中文翻译：

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氧化锆的快速微波压制

微波压制是降低微波烧结温度和稳定微波粉末材料加工的一种很有前景的方法。对调节压力辅助微波腔进行了多物理场仿真。该模拟考虑了谐振现象和氧化锆的非线性温度相关材料参数。微波系统和氧化锆的固有特性使得微波压制的调节变得困难。然而，同样的现象可用于激活闪烧。快速微波烧结使用谐振微波分布的高电场、氧化锆电阻率的负温度特性 (NTC) 以及通过模具压实配置施加到粉末的机械压力。由此产生的快速微波压制在加工材料结构的均匀性方面仍然需要改进，但它有能力成为最快的烧结处理，因为它允许在室温下活化，总加工时间只需几秒钟。此外，这种 10-20 秒的加工技术已显示出提高氧化铝预烧结试样透明度的良好潜力。