Mineralogical and microstructural changes in fused cast Ti-stabilized alumina-zirconia eutectic ceramics at elevated temperatures

IF 2.9 Q1 MATERIALS SCIENCE, CERAMICS

Open Ceramics Pub Date : 2025-06-01 DOI:10.1016/j.oceram.2025.100798

Annalena Erlacher , Adrian Villalba Weinberg , Christian L. Lengauer , Andreas Börger

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Abstract

Ti-stabilized alumina-zirconia eutectic ceramics produced by fusion-casting are characterized to investigate microstructural mechanisms at elevated temperatures and to explain the self-sharpening effect. Scanning electron microscopy (SEM) images show fine-grained lamellar eutectic microstructures with well-defined domains. After thermal annealing at 800 °C, distinct cracks formed along the domain boundaries. Thermal analyses and powder X-ray diffraction (pXRD), using Rietveld evaluation, confirmed that the cracks are triggered by the phase transformation from meta-stable tetragonal to monoclinic ZrO₂, causing a volume increase of up to 13.4 %. This indicates a decrease in the stabilizing effect of Ti in the meta-stable tetragonal ZrO₂ starting from 669 °C, and subsequently triggering the phase transformation. Additionally, structural analysis of pXRD data reveals internal stresses within the crystal lattice, showing expansion of tetragonal ZrO₂ along the c-axis and distortions in the basal plane in both tetragonal and monoclinic ZrO₂.

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高温熔铸钛稳定铝氧化锆共晶陶瓷的矿物学和显微组织变化

采用熔铸法制备钛稳定铝氧化锆共晶陶瓷，研究了高温下的显微组织机制，并解释了自锐效应。扫描电镜（SEM）图像显示出细粒的层状共晶组织，具有明确的结构域。经800℃热处理后，沿区域边界形成明显的裂纹。热分析和粉末x射线衍射（pXRD），利用Rietveld评价，证实了裂纹是由亚稳定的四方相转变为单斜相ZrO2引发的，导致体积增加13.4%。这表明从669℃开始，Ti对亚稳定四方ZrO2的稳定作用减弱，随后引发相变。此外，pXRD数据的结构分析揭示了晶格内的内应力，显示四方ZrO2沿c轴扩展，四方ZrO2和单斜ZrO2在基面上都有变形。

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