کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1459243 | 989591 | 2015 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Synthesis of TaAlO4 compound and Al2O3–TaAlO4 composite ceramic by mechanical alloying and their sintering Synthesis of TaAlO4 compound and Al2O3–TaAlO4 composite ceramic by mechanical alloying and their sintering](/preview/png/1459243.png)
This work discusses on the synthesis of TaAlO4 compound and Al2O3–TaAlO4 composite ceramic by mechanical alloying and subsequent sintering from the Al2O3–50 mol%Ta2O5 and Al2O3–5 mol%Ta2O5 powder mixtures, respectively. The samples were milled, compacted and sintered at 1200 °C for 240 min in order to obtain the equilibrium phases. The as-milled powders and sintered samples were characterized by X-ray diffraction, and BET analysis, He-picnometry, and DSC/TG analyses. Only peaks of α-Al2O3 and Ta2O5 were identified in XRD patterns of as-milled Al2O3–5 mol%Ta2O5 and Al2O3–50 mol%Ta2O5 powders. Results have indicated that Al ions were preferentially dissolved into the Ta2O5 lattice in order to form metastable structures. The average density of the Al2O3–5 mol%Ta2O5 and Al2O3–50 mol%Ta2O5 powder particles was reduced during ball milling while that their surface areas were continuously increased during ball milling, respectively. For the Al2O3–50 mol%Ta2O5 powder mixture, the surface area was reduced during the initial milling time. After sintering at 1200 °C for 240 min, the TaAlO4 compound and Al2O3–TaAlO4 composite were formed from the mechanically alloyed Al2O3–5 mol%Ta2O5 and Al2O3–50 mol%Ta2O5 samples, respectively.
Journal: Ceramics International - Volume 41, Issue 2, Part A, March 2015, Pages 2260–2265