Abstract
Ultrasonic spectroscopy together with optical microscopy were used to study the distribution of porosity in two-dimensional carbon-carbon composites. In the frequency-dependent (0. 5-3. 0 MHz) attenuation, characteristic features are found which lead to separate estimates of mean size and volume fraction of pores. Four samples of two-dimensional carbon-carbon composites were studied, corresponding to each of four key steps in the fabrication process. A method was developed to analyze the data. A correlation between the degree of porosity and ultrasonic attenuation was found in qualitative agreement with theory. The absence of quantitative agreement is thought to be a result of nonideal (nonspherical) geometry of the pores.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 1047-1050 |
| Number of pages | 4 |
| Journal | Ultrasonics Symposium Proceedings |
| State | Published - Dec 1 1986 |
All Science Journal Classification (ASJC) codes
- Engineering(all)