Mechanical and Thermal Properties of MgAl₂O₄-Y₃Al₅O₁₂ Ceramic Composites

Abstract:

MgAl₂O₄-Y₃Al₅O₁₂ ceramic composites were prepared using fused spinel and a Y₂O₃ micropowder as the raw materials. The microstructure and thermal properties of the composites were characterized by X-ray diffraction, scanning electron microscopy, laser flash diffusivity measurements. The mechanical properties were also determined. MgAl₂O₄-Y₃Al₅O₁₂ ceramic composites are composed of spinel and garnet structures. The thermal expansion coefficients of MgAl₂O₄ and MgAl₂O₄-Y₃Al₅O₁₂ ceramics are similar. The measured thermal diffusivity decreases gradually with increasing temperature. Thermal conductivity of the composites is in the range of 3.3-5.8 W∙m^-1∙K^-1 from 400°C to 900°C.

• Periodical: Solid State Phenomena (Volume 281)
• Pages: 255-260
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.281.255
• Online since: August 2018
• Authors: Jiang Bo Liu, Zhou Fu Wang*, Hao Liu, Xi Tang Wang, Yan Ma
• Keywords: Mechanical Properties, MgAl₂O₄-Y₃Al₅O₁₂ Ceramic Composites, Microstructure, Thermal Properties

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