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Internal friction and Young’s modulus of a carbon matrix for biomorphic silicon carbide ceramics
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This study examined the amplitude, temperature, and time dependences of Young's modulus and internal friction (ultrasonic attenuation) of a eucalyptus-based carbon biomatrix intended for biomorphic silicon carbide ceramics. The results showed that adsorption and desorption of ambient molecules significantly affected elastic and acoustic properties, and microplastic properties were estimated from acoustic measurement data.
The amplitude, temperature, and time dependences of the Young’s modulus and internal friction (ultrasonic attenuation) of a eucalyptus-based carbon biomatrix intended for preparing biomorphic silicon carbide ceramics were studied. Adsorption and desorption of molecules of the ambient medium (air) was shown to determine, to a considerable extent, the effective Young’s modulus and acoustic vibration decrement of a specimen. A doublet maximum in the temperature dependence of ultrasonic attenuation was observed at a temperature close to the sublimation temperature of solid CO2. The microplastic properties of the material were estimated from acoustic measurement data.
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