超快高温烧结非对称梯度YSZ陶瓷

Ultrafast High-temperature Sintering for Asymmetrical Gradient YSZ Ceramics

制备非对称梯度YSZ陶瓷通常需要多次烧结工艺或预制分层结构的坯体,存在高能耗和高成本的缺点。本文通过拓展超快高温烧结(UHS)技术,实现了在几秒钟内制备不对称梯度YSZ陶瓷,大幅度降低了能耗。研究了不同烧结温度下制备的梯度YSZ陶瓷的孔隙率、密度和晶粒尺寸。结果表明,在2000℃稳定15 s的UHS梯度烧结过程中,陶瓷底部形成了相对密度为95%的致密层,其余为相对密度小于95%的多孔结构,晶粒尺寸从3.5μm减小到1.5μm,且微观结构的梯度特征与热场内温度梯度分布一致。这种梯度烧结技术为非对称梯度陶瓷的制备提供了一种快速、简便的方法。

The preparation of asymmetric gradient YSZ ceramics usually requires a multiple sintering process or a blank body of prefabricated layered structure,both of which are high energy consumption and high cost.In this work,ultrafast high-temperature sintering(UHS)technology was developed to facilitate the preparation of asymmetric gradient YSZ ceramics in a few seconds and greatly reduce energy consumption.The porosity,density and grain size of gradient YSZ ceramics prepared at different sintering temperatures were studied.The results show that during the UHS gradient sintering process stabilized at 2000℃for 15 seconds,a dense layer with a relative density of 95%is formed at the bottom of the ceramic,and the rest are porous structures with a relative density of less than 95%.The grain size decreases from 3.5μm to 1.5μm,and the gradient microstructure is consistent with the temperature gradient generated by the gradient thermal field.This gradient sintering technique provides a fast and simple method for the preparation of asymmetric gradient ceramics.