Carbon/Carbon(C/C) composite materials have been used aircraft parts, automotive brake disk, etc. because of excellent heat-resisting property in super high temperature, excellent antiabrasion and excellent mechanical properties. It is desirable to pe...
Carbon/Carbon(C/C) composite materials have been used aircraft parts, automotive brake disk, etc. because of excellent heat-resisting property in super high temperature, excellent antiabrasion and excellent mechanical properties. It is desirable to perform ultrasonic testing to grasp Characteristic of this C/C composite materials and homogeneity of its parts. In this work, we applied ultrasonic image and a peak-delay measurement method to C/C composite which could cause inhomogeneity under manufacturing process. We had put inspection material into water tank to estimate homogeneity of materials using automated acquisition scanner and mapped a ultrasonic image to estimate the material property inhomogeneity. Also, low frequency(5㎒) pulse-echo technique based on both amplitude and time-of-flight of the ultrasonic pulse were used for estimating ultrasonic time-of-flight. Surface of the material was observed with using an electron microscope and those were compared with ultrasonic image. Therefore variation of ultrasonic velocity was correlated to those of material density, which is based on the peak-delay measurement method.