Influence of zircon particle size on conventional and microwave assisted reaction sintering of in-situ mullite-zirconia composites
Ceramics International, cilt.42, sa.9, ss.11104-11117, 2016 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 42 Sayı: 9
- Basım Tarihi: 2016
- Doi Numarası: 10.1016/j.ceramint.2016.04.016
- Dergi Adı: Ceramics International
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Sayfa Sayıları: ss.11104-11117
- Anahtar Kelimeler: Microwave processing, Mullite, Sintering, ZrO2
- Ankara Yıldırım Beyazıt Üniversitesi Adresli: Hayır
Özet
© 2016 Elsevier Ltd and Techna Group S.r.l.Mullite-zirconia composites were fabricated by reaction sintering of ZrSiO4 and α-Al2O3 using conventional heating and microwave processing. The powder mixtures were prepared from sub-micron zircon powders with three different particle sizes and CIPed as coin shaped samples. The samples sintered both in a muffle furnace and microwave furnace. The open porosities, bulk and true densities were measured. Phase transformations were characterized by X-ray diffraction and microstructures were evaluated by scanning electron microscopy. The effects of zircon particle size on the in-situ transformation system and mullitization was evaluated for both methods. As a result, decreasing zircon particle size decreases the in-situ transformation temperature for 25 °C (1575 °C) in conventional heating. Microwave assisted sintering (MAS) lowers the transformation temperature at least 50 °C by lowering the activation energy more efficiently and gives better densification than conventional sintering. Furthermore, milling also produces structures having finer mullite grains.