激光超声技术测量高温下蓝宝石单晶的弹性模量  

Temperature dependence of elastic modulus of single crystal sapphire investigated by laser ultrasonic

作　　者：宋云飞[1] 于国洋[1] 殷合栋[1] 张明福[2] 刘玉强[1] 杨延强[1] 

机构地区：[1]哈尔滨工业大学物理系凝聚态科学与技术研究中心,哈尔滨150001 [2]哈尔滨工业大学复合材料与结构研究所,哈尔滨150001

出　　处：《物理学报》2012年第6期273-277,共5页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:20973050)资助的课题~~

摘　　要：利用纳秒激光脉冲所激发的超声纵波,非接触地测量了蓝宝石单晶沿c轴方向的弹性模量C_(33)随温度的变化关系.结果表明,在室温到1000℃的范围内,蓝宝石的弹性模量C_(33)随温度T的升高而减小,两者之间近似呈如下二次关系:C_(33)=-1.541×10^(-5)T^(2)-0.021T+498.3.由于该方法利用激光烧蚀效应激发出了强度很大的纵波,因此对弹性模量的测量具有较高的精度,估算C_(33)的测量误差不超过0.1%.The longitudinal ultrasonic wave launched by ns-laser pulse is used to measure the temperature dependence of the elastic modulus C33 of single crystal sapphire.The result shows that in a temperature from room temperature to 1000°C the elastic modulus of sapphire C33 reduces as the temperature increases,following the relationship C_（33） =-1.541 x 10~（-50T^2 - 0.021T ＋ 498.3.In this method,the ablation mechanism is adopted to launch strong longitudinal waves,therefore,the result is accurate that the error of the measurement is estimated to be no more than 0.1%.

关 键 词：激光超声 蓝宝石 弹性模量 高温 

分 类 号：TQ164.2[化学工程—高温制品工业]