2018
DOI: 10.1111/jace.15506
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Enhanced microwave‐absorbing property of precursor infiltration and pyrolysis derived SiCf/SiC composites at X band: Role of carbon‐rich interphase

Abstract: Ceramic matrix composites (CMCs) can be microwave-absorbent when endowing the composite constituents with proper dielectric properties. In this work, we report a new method to enhance the microwave-absorbing property of CMCs by in situ fabrication of a carbon-rich interphase at the fiber/matrix interface. This was achieved in a SiC fiber reinforced SiC matrix (SiCf/SiC) composite fabricated by precursor infiltration and pyrolysis (PIP). We found that as the PIP temperature increased from 800 to 1000°C, the mic… Show more

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Cited by 30 publications
(5 citation statements)
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“…For dielectric absorbing materials, the loss mechanism includes conduction loss related to material conductivity and polarization loss such as interfacial polarization and molecular dipole polarization. 56,57 Based on the Debye relaxation theory, ε ′ and ε ′′ were calculated using eqn (3) and (4): 51 where τ , ω , ε s , ε ∞ , σ , and ε 0 are the temperature-dependent relaxation time, angular frequency, static permittivity, relative permittivity at the high-frequency limit, conductivity, and relative complex permittivity in vacuum, respectively. According to eqn (3) and (4), ε ′ was mainly dependent on polarization relaxation, and ε ′′ was determined by polarization relaxation loss and conductance loss.…”
Section: Resultsmentioning
confidence: 99%
See 1 more Smart Citation
“…For dielectric absorbing materials, the loss mechanism includes conduction loss related to material conductivity and polarization loss such as interfacial polarization and molecular dipole polarization. 56,57 Based on the Debye relaxation theory, ε ′ and ε ′′ were calculated using eqn (3) and (4): 51 where τ , ω , ε s , ε ∞ , σ , and ε 0 are the temperature-dependent relaxation time, angular frequency, static permittivity, relative permittivity at the high-frequency limit, conductivity, and relative complex permittivity in vacuum, respectively. According to eqn (3) and (4), ε ′ was mainly dependent on polarization relaxation, and ε ′′ was determined by polarization relaxation loss and conductance loss.…”
Section: Resultsmentioning
confidence: 99%
“…For dielectric absorbing materials, the loss mechanism includes conduction loss related to material conductivity and polarization loss such as interfacial polarization and molecular dipole polarization. 56,57 Based on the Debye relaxation theory, 3 ′ and 3 ′′ were calculated using eqn (3) and (4): 51…”
Section: Emw Absorption Mechanismmentioning
confidence: 99%
“…The real part (ε′) and imaginary part (ε″) of the complex permittivity decrease significantly with frequency increase and exhibit excellent frequency dispersion effect, which imply the polarization charge inside the material have a significant hysteresis effect when moving in alternating electromagnetic field. Enhanced hysteresis effect increases electromagnetic loss, so it has the potential for broadband microwave absorption [21].…”
Section: Resultsmentioning
confidence: 99%
“…The complex permittivity and the complex permeability will directly affect the electromagnetic wave loss of the materials. The bigger of the complex permittivity and complex permeability, the greater loss [33][34][35].…”
Section: Resultsmentioning
confidence: 99%