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Investigation of mechanical properties of mullite-calcium oxide-zirconium dioxide ceramics

Mehmet Akif Hafızoğlu|Ahmet Akkuş|Ömer Karabey
청정에너지연구소 (Clean-Energy Research Institute)|2024.10|Journal of Ceramic Processing Research|제25권 제5호|pp. 814-826|DOI 10.36410/jcpr.2024.25.5.814

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키워드

Mechanical propertiesMulliteCalcium oxideZirconium dioxideWear.
주제분류재료공학

초록

In this study, Calcium Oxide (CaO) - Zirconium Dioxide (ZrO2) ceramics and their mullite-doped composite ceramics, whichare among the advanced technology ceramics, are examined. During the production phase of the samples, first monocliniczirconium dioxide was stabilized with calcium oxide (calcia) to obtain stabilized ZrO2. Subsequently, mullite additive was addedto these composite mixtures at rates ranging from 0% to 10% by weight, and samples were produced. Not only the effect ofmullite additive but also sintering temperature and durations on the microstructure and mechanical properties of CaO-ZrO2ceramics was investigated. For each sample, sintering temperature parameters were determined to be in the range of 1500oC-1600 oC, and sintering time parameters were determined to be in the range of 1-5 hours. The test and microstructuralanalysis results demonstrate that the introduction of mullite into the CaO-stabilized ZrO2 composites significantly enhancedthe wear resistance. Moreover, it is discerned that sintering at comparatively lower temperatures and for shorter durationsprovides an augmentation in three-point bending strength, albeit accompanied by a general decrease in hardness.

Abstract

In this study, Calcium Oxide (CaO) - Zirconium Dioxide (ZrO2) ceramics and their mullite-doped composite ceramics, whichare among the advanced technology ceramics, are examined. During the production phase of the samples, first monocliniczirconium dioxide was stabilized with calcium oxide (calcia) to obtain stabilized ZrO2. Subsequently, mullite additive was addedto these composite mixtures at rates ranging from 0% to 10% by weight, and samples were produced. Not only the effect ofmullite additive but also sintering temperature and durations on the microstructure and mechanical properties of CaO-ZrO2ceramics was investigated. For each sample, sintering temperature parameters were determined to be in the range of 1500oC-1600 oC, and sintering time parameters were determined to be in the range of 1-5 hours. The test and microstructuralanalysis results demonstrate that the introduction of mullite into the CaO-stabilized ZrO2 composites significantly enhancedthe wear resistance. Moreover, it is discerned that sintering at comparatively lower temperatures and for shorter durationsprovides an augmentation in three-point bending strength, albeit accompanied by a general decrease in hardness.

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