Development and Characterization of the Al₂O₃-YAG Ceramic Composites

Abstract:

YAG (Y₃Al₅O₁₂) and Al₂O₃ ceramics have high resistance to oxidation and corrosion in harsh environments and high temperatures, which turns into a quite attractive material as compared to other ceramics. Thus, lately oxide ceramic YAG has been extensively used as reinforcement phase to Al₂O₃ in order to obtain a composite with improved mechanical properties. This research focused on the development of sintered Al₂O₃-Y₂O₃ powder mixtures for the production of Al₂O₃-YAG composite. Powder mixtures composed of 63.65:36.35wt.% and 80.00:20.00wt.% of Al₂O₃ and Y₂O₃, respectively, were milled by planetary milling for 2h. The compositions were compacted by cold uniaxial pressing, at 70 MPa, for 30s. The two mixtures were sintered at 1500 and 1600°C for 3h. The samples were evaluated for relative density, shrinkage, weight loss, and X-Ray Diffraction (XRD). Scanning Electron Microscopy (SEM) was used for microstructural characterization. The X-Ray Diffraction showed the presence of Al₂O₃ and Y₃Al₅O₁₂ as crystalline phases in both compositions. Samples composed by 80:20wt.% of Al₂O₃/Y₂O₃ powder sintered at 1600⁰C-3h presented the higher relative density ranging around 86% of theoretical density.

• Periodical: Materials Science Forum (Volumes 798-799)
• Pages: 383-388
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.798-799.383
• Online since: June 2014
• Authors: Eduardo Sousa Lima*, A.P.O. Santos, L.M. Itaboray, C. Santos, R.F. Cabral
• Keywords: Al₂O₃-YAG Ceramic Composite, Characterization, Sintering

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