Microwave sintering of zirconia-toughened alumina (ZTA)-TiO2-Cr2O3 ceramic composite: the effects on microstructure and properties
This paper focuses on the development of a zirconia-toughened alumina ZTA-TiO2-Cr2O3 ceramic composite by means of microwave sintering at 2.45 GHz within the range 1200 °C–1400 °C, with a dwell time of 5–20 min. It is aimed at attaining improved microstructure and properties at a lower sintering tem...
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| Format: | Article |
| Language: | English English English |
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Elsevier
2017
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| Online Access: | http://irep.iium.edu.my/59420/ http://irep.iium.edu.my/59420/1/59420_Microwave%20sintering%20of%20zirconia-toughened.pdf http://irep.iium.edu.my/59420/2/59420_Microwave%20sintering%20of%20zirconia-toughened_SCOPUS.pdf http://irep.iium.edu.my/59420/7/59420_Microwave%20sintering%20of%20zirconia-toughened_WOS.pdf |
| _version_ | 1848785309861412864 |
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| author | Manshor, Hanisah Abdullah, Ezzat Chan Ahmad Azhar, Ahmad Zahirani Yeo, Wee Sing Ahmad, Zainal Arifin |
| author_facet | Manshor, Hanisah Abdullah, Ezzat Chan Ahmad Azhar, Ahmad Zahirani Yeo, Wee Sing Ahmad, Zainal Arifin |
| author_sort | Manshor, Hanisah |
| building | IIUM Repository |
| collection | Online Access |
| description | This paper focuses on the development of a zirconia-toughened alumina ZTA-TiO2-Cr2O3 ceramic composite by means of microwave sintering at 2.45 GHz within the range 1200 °C–1400 °C, with a dwell time of 5–20 min. It is aimed at attaining improved microstructure and properties at a lower sintering temperature and shorter soaking time, compared to using a conventional heating method. Consequently, the effects of sintering temperature and soaking time on densification, properties and microstructural behaviour of the composite, are investigated. XRD analysis reveals that the microwave-sintered samples possess a higher crystallinity at a higher sintering temperature. Microstructural analysis confirms the uniform distribution of particles and controlled grain growth; with the lowest AGI value being 1.28 grains/μm. The sample that is microwave-sintered at 1350 °C with 10 min of soaking time achieves a high density (95.74% of the theoretical density), elevated hardness (1803.4 HV), and excellent fracture toughness (9.61 MPa m1/2), and intergranular cracks. This proves that the microwave sintering technique enhances densification, microstructural evolution and the properties of the ceramic composite at a lower temperature and shorter soaking time, compared to conventional heating. Overall, the improved mechanical properties of the microwave-sintered ceramics, compared to conventionally-sintered ceramics, are attributed to the enhanced densification and finer and more homogeneous microstructure that is achieved through the use of a microwave sintering method. The results reveal that microwave sintering is effective in improving the microstructure and density of materials, and will be useful for enhancing the mechanical properties of ZTA-TiO2-Cr2O3 ceramic composites. |
| first_indexed | 2025-11-14T16:51:06Z |
| format | Article |
| id | iium-59420 |
| institution | International Islamic University Malaysia |
| institution_category | Local University |
| language | English English English |
| last_indexed | 2025-11-14T16:51:06Z |
| publishDate | 2017 |
| publisher | Elsevier |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | iium-594202017-11-17T02:42:40Z http://irep.iium.edu.my/59420/ Microwave sintering of zirconia-toughened alumina (ZTA)-TiO2-Cr2O3 ceramic composite: the effects on microstructure and properties Manshor, Hanisah Abdullah, Ezzat Chan Ahmad Azhar, Ahmad Zahirani Yeo, Wee Sing Ahmad, Zainal Arifin QC Physics This paper focuses on the development of a zirconia-toughened alumina ZTA-TiO2-Cr2O3 ceramic composite by means of microwave sintering at 2.45 GHz within the range 1200 °C–1400 °C, with a dwell time of 5–20 min. It is aimed at attaining improved microstructure and properties at a lower sintering temperature and shorter soaking time, compared to using a conventional heating method. Consequently, the effects of sintering temperature and soaking time on densification, properties and microstructural behaviour of the composite, are investigated. XRD analysis reveals that the microwave-sintered samples possess a higher crystallinity at a higher sintering temperature. Microstructural analysis confirms the uniform distribution of particles and controlled grain growth; with the lowest AGI value being 1.28 grains/μm. The sample that is microwave-sintered at 1350 °C with 10 min of soaking time achieves a high density (95.74% of the theoretical density), elevated hardness (1803.4 HV), and excellent fracture toughness (9.61 MPa m1/2), and intergranular cracks. This proves that the microwave sintering technique enhances densification, microstructural evolution and the properties of the ceramic composite at a lower temperature and shorter soaking time, compared to conventional heating. Overall, the improved mechanical properties of the microwave-sintered ceramics, compared to conventionally-sintered ceramics, are attributed to the enhanced densification and finer and more homogeneous microstructure that is achieved through the use of a microwave sintering method. The results reveal that microwave sintering is effective in improving the microstructure and density of materials, and will be useful for enhancing the mechanical properties of ZTA-TiO2-Cr2O3 ceramic composites. Elsevier 2017-10-25 Article PeerReviewed application/pdf en http://irep.iium.edu.my/59420/1/59420_Microwave%20sintering%20of%20zirconia-toughened.pdf application/pdf en http://irep.iium.edu.my/59420/2/59420_Microwave%20sintering%20of%20zirconia-toughened_SCOPUS.pdf application/pdf en http://irep.iium.edu.my/59420/7/59420_Microwave%20sintering%20of%20zirconia-toughened_WOS.pdf Manshor, Hanisah and Abdullah, Ezzat Chan and Ahmad Azhar, Ahmad Zahirani and Yeo, Wee Sing and Ahmad, Zainal Arifin (2017) Microwave sintering of zirconia-toughened alumina (ZTA)-TiO2-Cr2O3 ceramic composite: the effects on microstructure and properties. Journal of Alloys and Compounds, 722. pp. 458-466. ISSN 0925-8388 http://www.sciencedirect.com/science/article/pii/S092583881732114X 10.1016/j.jallcom.2017.06.115 |
| spellingShingle | QC Physics Manshor, Hanisah Abdullah, Ezzat Chan Ahmad Azhar, Ahmad Zahirani Yeo, Wee Sing Ahmad, Zainal Arifin Microwave sintering of zirconia-toughened alumina (ZTA)-TiO2-Cr2O3 ceramic composite: the effects on microstructure and properties |
| title | Microwave sintering of zirconia-toughened alumina (ZTA)-TiO2-Cr2O3 ceramic composite: the effects on microstructure and properties |
| title_full | Microwave sintering of zirconia-toughened alumina (ZTA)-TiO2-Cr2O3 ceramic composite: the effects on microstructure and properties |
| title_fullStr | Microwave sintering of zirconia-toughened alumina (ZTA)-TiO2-Cr2O3 ceramic composite: the effects on microstructure and properties |
| title_full_unstemmed | Microwave sintering of zirconia-toughened alumina (ZTA)-TiO2-Cr2O3 ceramic composite: the effects on microstructure and properties |
| title_short | Microwave sintering of zirconia-toughened alumina (ZTA)-TiO2-Cr2O3 ceramic composite: the effects on microstructure and properties |
| title_sort | microwave sintering of zirconia-toughened alumina (zta)-tio2-cr2o3 ceramic composite: the effects on microstructure and properties |
| topic | QC Physics |
| url | http://irep.iium.edu.my/59420/ http://irep.iium.edu.my/59420/ http://irep.iium.edu.my/59420/ http://irep.iium.edu.my/59420/1/59420_Microwave%20sintering%20of%20zirconia-toughened.pdf http://irep.iium.edu.my/59420/2/59420_Microwave%20sintering%20of%20zirconia-toughened_SCOPUS.pdf http://irep.iium.edu.my/59420/7/59420_Microwave%20sintering%20of%20zirconia-toughened_WOS.pdf |