Sintering Of MgO and TiO{sub 2} Doped Al-Zr Oxides Composites by Extended Arc Thermal Plasma
- Institute of Materials Science, Planetarium Building, Bhubaneswar-751013 (India)
- Inter-University Acclerator Centre, Aruna Asaf Ali Marg, New Delhi-110067 (India)
- Advanced Materials Technology Section, RRL, Bhubaneswar-751013 (India)
- Department of Materials Science and Engineering, National Chenkong University, Tainan, 701, Taiwan (China)
MgO and TiO{sub 2} doped Al-Zr oxide composites of Zr{sub 0.95}Al{sub 1.05}Mg{sub x}O with x = 0,0.01,...,0.05,0.75,1 and Zr{sub 0.95}-Al{sub 1.05}-Ti{sub z}-O with z = 0, 0.025,....,1 were sintered to high density by both DC thermal plasma assisted rapid sintering as well as conventional sintering. It is observed that the above mentioned MgO and TiO{sub 2} doped Al-Zr oxide composites were sintered to high density end products by the thermal plasma heating technique within a short sintering time (a few minutes) as compared to a conventional long range resistive heating schedule (a few tens of hours). It is also noticed that there exists a critical limiting point of MgO doping concentration (x = 0.05 in Zr{sub 0.95}Al{sub 1.05}Mg{sub x}O) for maximum physical densification in both conventional as well as plasma sintered samples. Sintered specimens were analyzed by XRD studies. XRD studies revealed the presence of a high density phase, Mg{sub 2}Zr{sub 5}O{sub 12} prominently in x = 0.05 sintered sample which resulted in maximum densification of the sample. With increasing doping concentration of TiO{sub 2}(i.e. z=0 to 1), {rho}{sub s}(sintered density) of both plasma sintered and conventional sintered specimens were found to follow a concavity like variation with well defined critical limit of TiO{sub 2} concentration (i.e. at z=0.05) at which {rho}{sub s} became minimum. However, hardness was found to be maximum at z = 0.05.
- OSTI ID:
- 21251599
- Journal Information:
- AIP Conference Proceedings, Vol. 1063, Issue 1; Conference: IWMNMM-2008: International workshop on mesoscopic, nanoscopic and macroscopic materials, Bhubaneswar (India), 2-4 Jan 2008; Other Information: DOI: 10.1063/1.3027164; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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