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Mechanical Properties and Solid Particle Erosion Behavior of LaMgAl 11 O 19 –Al 2 O 3 Ceramic at Room and Elevated Temperatures
Author(s) -
Tang Hao,
Fang Minghao,
Min Xin,
Wang Xiaojun,
Huang Zhaohui,
Wen Ruilong,
Liu Yangai,
Wu Xiaowen
Publication year - 2016
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.14205
Subject(s) - materials science , microstructure , ceramic , erosion , composite material , particle (ecology) , intergranular corrosion , grain boundary , metallurgy , oceanography , geology , paleontology , biology
In this work, the mechanical properties and solid particle erosion wear behavior of LaMgAl 11 O 19 –Al 2 O 3 ceramics toughened and reinforced with LaMgAl 11 O 19 platelets were investigated. The effects of LaMgAl 11 O 19 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 LaMgAl 11 O 19 –Al 2 O 3 composites were systematically studied. The results indicated that LaMgAl 11 O 19 –Al 2 O 3 ceramics exhibited superior erosive wear resistance compared to monolithic Al 2 O 3 ceramics at room and elevated temperatures due to their enhanced mechanical properties and improved microstructure resulting from the introduction of an appropriate amount of LaMgAl 11 O 19 platelets. Examination of the eroded surfaces of LaMgAl 11 O 19 –Al 2 O 3 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.