Nath, Mithun and Kumar, Pawan and Song, Shengqiang and Li, Yawei and Tripathi, Himanshu Sekhar (2019) Thermo-mechanical stability of bulk (Al1-xCrx)(2)O-3 solid solution. Ceramics International, 45 (9). pp. 12411-12416. ISSN 0272-8842

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Bulk alpha-(Al,Cr)(2)O-3 (where, x = 0, 0.1, 0.3, 0.5) sintered compacts were obtained at 1600-1700 degrees C, whose thermo-mechanical behavior were observed upon reheating at 25-1200 degrees C. Unlike bulk alpha-Al2O3 sintered samples, all the bulk alpha-(Al,Cr)(2)O-3 sintered compacts showed a noticeable unusual flexural strength reduction at 600 degrees C. However, thermal shock behavior of all the alpha-(Al1-xCr)(2)O-3 samples (sintered at 1650 degrees C) exhibited a similar trend with retention of 33-38% of initial strength after the 12th cycle. Selected sintered alpha-(Al0.5Cr0.5)(2)O-3 samples were reheated and quenched to observe any changes (phase, structural) using XRD, XPS, and FT-IR. The phase and binding energy did not reveal any change. The characteristics bands of MO6 units exhibited a lowering of wavelength by similar to 2.5 cm(-1) (original peaks at similar to 592 and similar to 648 cm(-1)) when reheated for 1 h and quenched from 600 degrees C. But, on prolonging the reheating time at 600 degrees C for 2 and 6 h, the band position shifted back to its original place. The force constant and bond energy are plausibly responsible for the fluctuational of molecular vibration to reach a time-dependent thermal equilibrium, particularly at similar to 600 degrees C in case of alpha-(Al,Cr)(2)O-3.

Item Type: Article
Subjects: Refractories
Divisions: Refractory
Depositing User: Bidhan Chaudhuri
Date Deposited: 15 Nov 2019 09:28
Last Modified: 15 Nov 2019 09:28

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