Abstract
The ultra high temperature ceramic composites (UHTCC) are of interest for hypersonic vehicle leading edge. The ultrasonic testing is one of the widely used non-destructive testing (NDT) for the material characterization. The aim of investigations described in this article is measurement of the mechanical properties of two ceramic composite by pulse-echo ultrasonic testing. These two samples (ZrB2-20%ZrC-20%SiC-5%Si3N4 and ZrB2 -20%SiC- 5%Si3N4) were fabricated by hot pressing into 25mm diameter and 4mm thickness discs. The measurements were performed using pulse echo ultrasonic technique and ultrasonic transducers with the frequencies 5.0 MHz. It was determined that the velocity of ultrasonic longitudinal and shear waves varies when the frequency is changing. Ultrasound velocity measurements were used to evaluate mechanical properties of UHTCC. These composites were prepared from ZrB2, SiC, ZrC and Si3N4 by ball milling and hot pressing.http://dx.doi.org/10.5755/j01.u.66.2.527
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