Mechanical Properties Evaluation of Al2O3-YAG Ceramic Composites

Eduardo de Sousa Lima; L.M. Itaboray; A.P.O. Santos; C. Santos; R.F. Cabral

doi:10.4028/www.scientific.net/MSF.820.239

Paper Titles

Mechanical and Microestructural Characterization of AL₂O₃ - ZrO₂ Ceramic Composite Reinforced with Rare Earth Oxides (Y₂O₃) for Inert Coating of Storage and Transport Systems of Crude Petroleum
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Curvature Evolution of Porcelain Tile during Firing
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Electrochemical Study of Ceramics Based on Niobium Oxide over Aluminum Alloy AA 3003
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The Usage of Ceramics in the Manufacture of the Lining of Temperature Sensors for the Oil Industry
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Mechanical Properties Evaluation of Al₂O₃-YAG Ceramic Composites
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Evaluation of the Thermomechanical Behavior of Metallic Interconnectors Coated with a Film of La_0,8Ca_0,2CrO₃ of Solid Oxide Fuel Cells (SOFC)
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Pressureless Sintering of ZrB₂ with β-SiC Addition
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Phase Stability - Structural and Microstructural Characterization of Al₂O₃-TiO₂ Ceramic Composites Reinforced with La₂O₃ Addition
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Hot Pressing Sintering of ZrB₂ with β-SiC Addition
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HomeMaterials Science ForumMaterials Science Forum Vol. 820Mechanical Properties Evaluation of Al2O3-YAG...

Mechanical Properties Evaluation of Al₂O₃-YAG Ceramic Composites

Abstract:

Y₃Al₅O₁₂ (YAG - Yttrium Aluminum Garnet) ceramic oxides has been widely used as a reinforcing phase to Al₂O₃ in order to achieve a composite with good mechanical properties. These factors are possible because the Al₂O₃ and YAG oxides possess thermal compatibility and high resistance to oxidation and corrosion, which makes your job quite attractive relative to other ceramics. This research was performed in two compositions, one in the eutectic composition with 63.65% Al₂O₃ and Y₂O₃ 36.35wt.% and one with 80.00% of Al₂O₃ and 20.00wt.% of Y₂O₃. After milling for 2h, the powder mixtures were dried for 48h at 120°C. Mixtures were then comminuted by mortar and pestle and sieved using a 100 mesh sieve. The compositions were compacted uniaxially at 70MPa for 30s. The two mixtures were sintered at 1500°C or 1600°C for 3h. The samples were evaluated for hardness by Vickers indentation, fracture toughness by the indentation method (K_IC) and Scanning Electron Microscopy (SEM). It was verified that the eutectic composition sintered at 1600°C-3h showed the highest hardness among the others, 10GPa, and a fracture toughness of 3.8MPa.m^1/2, both consistent with the literature results. The SEM images showed a reduction in porosity with increasing of sintering temperature.

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Materials Science Forum (Volume 820)

Pages:

239-243

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.820.239

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Online since:

June 2015

Authors:

Eduardo de Sousa Lima, L.M. Itaboray, A.P.O. Santos, C. Santos, R.F. Cabral

Keywords:

Al₂O₃-YAG Ceramic Composite, Fracture Toughness, Hardness, Microstructural Characterization

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