Elastic and anelastic properties of SiC/Si ecoceramics

The paper represents an acoustic investigation of elastic and anelastic properties of a new class of materials produced with natural (wood) products—biomorphic SiC/Si (bio-SiC/Si) ceramics. Specimens were fabricated by melt Si infiltration in a carbon bio-matrix after the wood (white eucalyptus) tem...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2006-12, Vol.442 (1), p.444-448
Main Authors: Kardashev, B.K., Smirnov, B.I., de Arellano-Lopez, A.R., Martinez-Fernandez, J., Varela-Feria, F.M.
Format: Article
Language:English
Subjects:
Adsorption–desorption
Amplitude dependences
Biomorphic SiC/Si ceramics
Carbon bio-matrix
Microplastic deformation
Young's modulus
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Summary:The paper represents an acoustic investigation of elastic and anelastic properties of a new class of materials produced with natural (wood) products—biomorphic SiC/Si (bio-SiC/Si) ceramics. Specimens were fabricated by melt Si infiltration in a carbon bio-matrix after the wood (white eucalyptus) templates pyrolysis. It has been found that there exist, at least, two mechanisms that influence the elastic and anelastic properties of bio-SiC/Si. The first one is adsorption and/or desorption of air molecules (presumably because of the pores and residual carbon). The second one is associated with a microplastic deformation that is due to dislocations or any other structural entities which can oscillate under ultrasonic stresses and, in this way, increase both the damping and non-linear anelastic strain. The eucalyptus carbon bio-matrix has also been studied.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2006.02.221