Morphological & physical characteristics of Ceria (CeO2) doped Zirconia Toughened Alumina (ZTA) ceramics composites
2
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
Zirconia Toughened Alumina (ZTA) composites are widely used in both emerging and established industries due to theirhigh hardness, excellent wear resistance, and high hot hardness. However, their inherent brittleness limits their applications,which can be addressed by incorporating softer phases inside hard ceramic matrices. Hence, in this study, different weightpercentages of CeO2 (ranging from 0 to 20 wt.%) as soft phases were added to ZTA matrices to investigate the resultingchanges in microstructure, phase transitions, and physical properties. Investigation starts with synthesis of ZTA/CeO2 obeyingco-precipitation method. After development of composites morphological evaluation i.e. XRD & FESEM for all samples werethoroughly carried out. The analysis indicated continuous increase in tetragonal phases of zirconia with incorporation ofCeO2 particles, strongly supporting the transformation toughening phenomenon. The maximum hardness obtained as15.19GPa, for 5 wt.% CeO2, whereas, maximum toughness obtained as 5.73 MPa.m1/2 for 20 wt.% CeO2. The decrement withhigher percentage of CeO2 attributed to the formation of larger grain size and porosity inside the composites. In addition,the transform toughening phenomenon also contributed to improvement in physical properties especially toughness of thecomposites.
Abstract
Zirconia Toughened Alumina (ZTA) composites are widely used in both emerging and established industries due to theirhigh hardness, excellent wear resistance, and high hot hardness. However, their inherent brittleness limits their applications,which can be addressed by incorporating softer phases inside hard ceramic matrices. Hence, in this study, different weightpercentages of CeO2 (ranging from 0 to 20 wt.%) as soft phases were added to ZTA matrices to investigate the resultingchanges in microstructure, phase transitions, and physical properties. Investigation starts with synthesis of ZTA/CeO2 obeyingco-precipitation method. After development of composites morphological evaluation i.e. XRD & FESEM for all samples werethoroughly carried out. The analysis indicated continuous increase in tetragonal phases of zirconia with incorporation ofCeO2 particles, strongly supporting the transformation toughening phenomenon. The maximum hardness obtained as15.19GPa, for 5 wt.% CeO2, whereas, maximum toughness obtained as 5.73 MPa.m1/2 for 20 wt.% CeO2. The decrement withhigher percentage of CeO2 attributed to the formation of larger grain size and porosity inside the composites. In addition,the transform toughening phenomenon also contributed to improvement in physical properties especially toughness of thecomposites.