Mechanical Properties and Solid Particle Erosion Behavior of LaMgAl11O19-Al2O3 Ceramic at Room and Elevated Temperatures.

In this work, the mechanical properties and solid particle erosion wear behavior of LaMgAl₁₁O₁₉-Al₂O₃ ceramics toughened and reinforced with LaMgAl₁₁O₁₉ platelets were investigated. The effects of LaMgAl₁₁O₁₉ additions, impingement angles (30°, 45°, 60°, 75°, and 90°), and erosion temperatures varying from room temperature to 1400°C on the erosion rates and material removal mechanisms of LaMgAl₁₁O₁₉-Al₂O₃ composites were systematically studied. The results indicated that LaMgAl₁₁O₁₉-Al₂O₃ ceramics exhibited superior erosive wear resistance compared to monolithic Al₂O₃ ceramics at room and elevated temperatures due to their enhanced mechanical properties and improved microstructure resulting from the introduction of an appropriate amount of LaMgAl₁₁O₁₉ platelets. Examination of the eroded surfaces of LaMgAl₁₁O₁₉-Al₂O₃ composites revealed that erosion temperatures and impingement angles play important roles in determining the erosion behavior and mechanisms of the tested materials. For the case of elevated temperature and oblique erosion, plowing and subsurface intergranular fracture are the predominant mechanisms resulting in material removal, whereas at room temperature and normal impact, the erosion process of the targets is primarily dominated by grain ejection and lateral crack intersection. [ABSTRACT FROM AUTHOR]