各向同性热解炭材料中的缺陷分析和超声检测技术

摘要

利用偏光金相显微镜和超声探伤仪对高性能机械密封用块体各向同性热解炭材料中的缺陷进行表征和无损检测.偏光显微观察发现,各向同性热解炭材料中的主要缺陷主要包括三种:各向异性夹杂、裂纹和各向同性夹杂.超声实验研究表明,利用脉冲反射法超声波检测技术可有效检出各向同性热解炭制件中存在的上述缺陷.目前该技术已成功地用于各向同性热解炭产品的批量探伤.%Internal defects and nondestructive testing of isotropic pyrolytic carbon (IPyC) for high performance mechanical seals were studied by the polarized light microscopy (PLM) and ultrasonic flaw detector. PLM observations show that the internal defects in the IPyC include three main types of anisotropie inclusions, cracks and isotropic inclusions. Ultrasonic tests show that the pulse-echo technique is a valid method to detect internal defects in the IPyC products. And now, this technique has been successfully applied to the batch testing of the IPyC products.