PDF(Pubmed)
Abstract：
This study developed advanced ceramic materials with both healing and decomposition functions using a metastable product generated under superheated steam. The developed composite material comprises ZrC particles dispersed in a yttria-stabilized zirconia (YSZ) matrix. After introducing a surface crack of approximately 120 μm on the composite specimen, it showed a complete strength recovery rate after one hour of heat treatment under superheated steam at 400 °C, while it exhibited a decomposition behavior after one hour of heat treatment in air at 400 °C. The XRD analysis of the heat-treated specimens showed that the final product was monoclinic ZrO2 under both steam and air conditions. In other words, full strength recovery in superheated steam was achieved by a chain reaction involving metastable intermediate products derived from H2O, unlike the reaction in air.
摘要：
这项研究使用在过热蒸汽下产生的亚稳态产物开发了具有愈合和分解功能的高级陶瓷材料。开发的复合材料包含分散在氧化钇稳定的氧化锆(YSZ)基质中的ZrC颗粒。在复合试样上引入约120μm的表面裂纹后，在400°C的过热蒸汽下热处理一小时后，它显示出完全的强度恢复率，在空气中在400°C下热处理1小时后表现出分解行为。热处理样品的XRD分析表明，在蒸汽和空气条件下，最终产物均为单斜晶系ZrO2。换句话说,过热蒸汽中的全部强度回收是通过涉及从H2O衍生的亚稳态中间产物的链式反应实现的，与空气中的反应不同。
