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Elastic and inelastic properties of SiC/Si biomorphic composites and biomorphic SiC based on oak and eucalyptus
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The elastic and microplastic properties of silicon carbide composites made from wood templates were investigated using acoustic techniques, finding that gas adsorption significantly affects stiffness and internal friction at small strains. The study characterizes how the biomorphic microstructure derived from oak and eucalyptus influences the mechanical behavior of these novel ceramics.
This paper reports on the results of a comparative investigation into the elastic and microplastic properties of biomorphic SiC/Si composites and biomorphic SiC prepared by pyrolysis of oak and eucalyptus with subsequent infiltration of molten silicon into a carbon matrix and additional chemical treatment to remove excess silicon. The acoustic studies were performed by the composite oscillator technique using resonant longitudinal vibrations at frequencies of about 100 kHz. It is shown that, in biomorphic SiC (as in biomorphic SiC/Si) at small-amplitude strains ε, adsorption and desorption of the environmental (air) molecules determine to a considerable extent the Young’s modulus E and the internal friction (decrement of acoustic vibrations δ) and that the changes in E and δ at these amplitudes are irreversible. The stress-microplastic strain curves are constructed from the acoustic data for the materials under study at temperatures of 100 and 290 K.
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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.
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This study investigates the effect of vibrational strain amplitude on the Young's modulus and internal friction (ultrasound absorption) of a biomorphic SiC/Si composite derived from sapele wood, using acoustic resonance measurements in air and vacuum.
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