- Tytuł:
- Preparation and Phase Transformation of Mullite-Zirconia from Boehmite and Algerian Halloysite
- Autorzy:
-
Raghdi, A.
Heraiz, M.
Sahnoune, F.
Ouali, A.
Redaoui, D. - Powiązania:
- https://bibliotekanauki.pl/articles/1033372.pdf
- Data publikacji:
- 2017-01
- Wydawca:
- Polska Akademia Nauk. Instytut Fizyki PAN
- Tematy:
-
81.05.Mh
68.37.hk
07.85.Nc - Opis:
- In this work, mullite-zirconia composite were fabricated by reaction sintering of Algerian halloysite Al₂Si₂O₅(OH)₄, boehmite Al(OOH), and zirconia (ZrO₂) powder using conventional heating. The appropriate amount of the three raw powders was ball milled for 5 h and sintered between 1250 and 1650°C for 2 h. A scanning electron microscope was used to characterize the microstructure of sintered samples. A dilatometer and X-ray diffractometer were used to analyze the formation and transformation of phases. It is found that for the addition of zirconia up to 20wt.% the zirconia phase retains its tetragonal structure. The formation of primary mullite in all samples was complete at 1220°C. The cristobalite started to form at 1350°C, and disappeared at 1500°C in the samples of mullite, and at 1450°C when ZrO₂ was added. The zircon compound ZrSiO₄ started to form at 1350°C and completely disappeared at 1550°C. The increase in ZrO₂ ratio promoted the formation of grains with a spherical shape.
- Źródło:
-
Acta Physica Polonica A; 2017, 131, 1; 136-138
0587-4246
1898-794X - Pojawia się w:
- Acta Physica Polonica A
- Dostawca treści:
- Biblioteka Nauki
Artykuł