Microwave sintering of zirconia-toughened alumina (ZTA)-TiO2-Cr2O3 ceramic composite

The effects on microstructure and properties

Hanisah Manshor, Ezzat Chan Abdullah, Ahmad Zahirani Ahmad Azhar, Wee Sing Yeo, Zainal Arifin Ahmad

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)458-466
Number of pages9
JournalJournal of Alloys and Compounds
Volume722
DOIs
Publication statusPublished - 01 Jan 2017

Fingerprint

Aluminum Oxide
Zirconia
Alumina
Sintering
Microwaves
Microstructure
Composite materials
Densification
Heating
Mechanical properties
Temperature
Microstructural evolution
zirconium oxide
Grain growth
Fracture toughness
Hardness
Cracks

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Cite this

Manshor, Hanisah ; Abdullah, Ezzat Chan ; Azhar, Ahmad Zahirani Ahmad ; Yeo, Wee Sing ; Ahmad, Zainal Arifin. / Microwave sintering of zirconia-toughened alumina (ZTA)-TiO2-Cr2O3 ceramic composite : The effects on microstructure and properties. In: Journal of Alloys and Compounds. 2017 ; Vol. 722. pp. 458-466.
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abstract = "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.",
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Microwave sintering of zirconia-toughened alumina (ZTA)-TiO2-Cr2O3 ceramic composite : The effects on microstructure and properties. / Manshor, Hanisah; Abdullah, Ezzat Chan; Azhar, Ahmad Zahirani Ahmad; Yeo, Wee Sing; Ahmad, Zainal Arifin.

In: Journal of Alloys and Compounds, Vol. 722, 01.01.2017, p. 458-466.

Research output: Contribution to journalArticle

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