CFCC的几种声学参量表征方法比较

化学气相渗透(CVI)制备的CFCC的质量控制非常困难。研究该材料质量的无损检测方法对材料使用及性能表征等都具有重要意义。针对声衰减严重的问题,采用穿透法测量各声学参量,用声速、衰减、非线性等相关参量评价材料的均匀性,同时用金相法进行对比测试。结果表明:声速、衰减、非线性等参量可准确地评价材料均匀性,其中声速评价是最成熟的表征方法。

Comparison of Several Acoustic Parameters Characterization Methods of CFCC

CFCC prepared by chemical vapor infiltration (CVI) has the difficulty in quality control. It is very important to study the quality of the material, and it has important significance for the material usage and performance characterization. In this paper, the density uniformity and quality of CFCC are evaluated by ultrasonic method. According to the serious attenuation, the penetration method is used to measure the acoustic parameters:sound velocity and attenuation,and nonlinear parameter evaluation material uniformity,and compared the test by the metallographic method.The results show that,attenuation and nonlinear parameter can accurately evaluate material uniformity,the sound velocity is the most mature uniformity characterization methods among them.