The Effect of Spark Plasma Sintering on Densification, Mechanical Properties, and Crystallographic Texture of LaMgAl11O19

Khorramirad, Mohammadmehdi; Hasanzadeh, Sanaz; Rahimipour, Mohammad Reza; Hadavi, Mohammad Mehdi; Shirvani, Kourosh

doi:10.22075/imcf.2025.39796.1051

The Effect of Spark Plasma Sintering on Densification, Mechanical Properties, and Crystallographic Texture of LaMgAl11O19

Document Type : Original Paper

Authors

¹ Semnan-Iran

² Ceramic Department of Materials and Energy Research Center (MERC), Karaj, Alborz, Iran

³ Department of Materials Engineering, Tarbiat Modares University, Tehran, Iran

⁴ Department of Advanced Materials and New Energies, Iranian Research Organization for Science and Technology (IROST), Tehran, Iran

10.22075/imcf.2025.39796.1051

Abstract

Lanthanum Magnesium Hexaaluminate (LaMgAl11O19, LaMA) is a promising material for various applications, including thermal barrier coatings, catalysts, and optical materials, due to its unique properties such as high-temperature thermodynamic and structural stability, low thermal conductivity, and good chemical resistance. In this study, the densi-fication of synthesized LaMA powder was investigated using spark plasma sintering (SPS). The effects of SPS on the relative density, mechanical properties, and crystallographic tex-ture were evaluated. The results showed that SPS achieved a high relative density of 97.56 ± 0.25% and a flexural strength of 367± 13 MPa, which is in good agreement with the find-ings of other researchers. Remarkably, X-ray diffraction analysis revealed the development of a strong crystallographic texture in the sintered body, characterized by a significant preferential orientation of the (006) plane (Texture Coefficient = 2.82). Scanning electron microscopy confirmed microstructural rearrangement and grain growth. The formation of this textured microstructure, attributed to the preferential alignment of platelet-like grains under uniaxial pressure during SPS, is a key finding of this work and contributes to the understanding of structure-property relationships in SPS-processed hexaaluminates.

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