Mg_(0.27)Al_(2.58)O_(3.73)N_(0.27)透明陶瓷机械性能评价

Characterization and Evaluation on Mechanical Property of Mg_(0.27)Al_(2.58)O_(3.73)N_(0.27) Transparent Ceramic

MgAlON透明陶瓷具有优良的光学与机械性能,在军用和民用领域均具有重要的应用潜力。本研究表征并评价了Mg_(0.27)Al_(2.58)O_(3.73)N_(0.27)透明陶瓷的机械性能,实验测定了Mg_(0.27)Al_(2.58)O_(3.73)N_(0.27)透明陶瓷的维氏硬度、断裂韧性以及室温和高温断裂强度,并使用Weibull函数对室温断裂强度测试结果进行统计。结果表明:该透明陶瓷特征断裂强度为255 MPa、断裂韧性为2.56 MPa/m^(1/2)、杨氏模量为288 GPa、硬度为15.1 GPa。样品的Weibull模数为4.5,1200℃下样品断裂强度达125 MPa。同时还测定了不同载荷下Mg_(0.27)Al_(2.58)O_(3.73)N_(0.27)透明陶瓷的硬度与不同载荷加载速率下的断裂强度。研究表明MgAlON光学透明陶瓷机械性能介于AlON和MgAl_2O_4之间。

Owing to excellent optical and mechanical properties, MgAlON transparent ceramic has been considered as a potential candidate for important military and civilian applications in recent years. In this study, several characterizations were conducted to evaluate the hardness, fracture toughness, and flexural strength of Mg0.27Al2.58O3.73N0.27 transparent ceramic. Flexural strength at room temperature of Mg0.27Al2.58O3.73N0.27 were further analyzed using Weibull statistic. The results show that theVicker＇s hardness, flexural strength, fracture toughness, and Young＇s modulus of the transparent ceramic were equal to 15.1 GPa, 255 MPa, 2.56 MPa/m^1/2, and 288 GPa, respectively, while the flexural strength of samples at 1200℃ was determined to be 125 MPa. The Weibull modulus of specimens was 4.5. Flexural strength and Vicker＇s hardness of Mg0.27Al2.58O3.73N0.27 transparent ceramic were also investigated under different loading condition. The work reveals that mechanical properties of MgAlON transparent ceramic are higher than those of MgAl2 O4 transparent ceramic, but a slightly lower than those of AlON transparent ceramic.