Abstract
Carbon nanotubes (CNTs) coated with SiC coating was successfully prepared by pyrolysis of polycarbosilane (PCS) used as a precursor. The function of pyrolysis temperature on the oxidation resistance and the dielectric properties of CNTs/SiC were studied in X-band. The results demonstrate that the obtained dense SiC film can prevent the oxidation of CNTs when the pyrolysis temperature reaches 600 °C. Correspondingly, after heat treatment is at 400 °C for 200 h, the mass loss of P-600 is less than 1.86%, and the real and imaginary parts of the dielectric constant nearly keep constant (ε′ from 14.2 to 14, and ε″ from 5.7 to 5.5). SiC-coated CNTs have a better oxidation resistance than pristine CNTs. Therefore, this work, with a facile preparation process, enhances the oxidation resistance of CNTs at high temperature for a long time and maintains a stable dielectric property, which means CNTs/SiC composites can be good candidates for applications in the field of high-temperature absorbers.
Highlights
Resistance and Stable DielectricElectromagnetic (EM) waves have been extensively used in various fields, including wireless communications, analytical equipment, and radar technology, which in turn causes serious EM pollution [1,2,3,4,5,6]
MWCNTs/SiCx Oy composite through the high temperature pyrolysis process, and the results demonstrated that the concentration of PCS had an important influence on the antioxidant properties of the coated MWCNTs
We investigate the oxidation resistance and dielectric property of PCScoated carbon nanotubes (CNTs) pyrolyzed at different temperatures (400 ◦ C, 600 ◦ C, and 800 ◦ C)
Summary
Electromagnetic (EM) waves have been extensively used in various fields, including wireless communications, analytical equipment, and radar technology, which in turn causes serious EM pollution [1,2,3,4,5,6]. Carbon nanotubes (CNTs), firstly discovered by Iijima in 1991, have become the most attractive absorbing material in terms of wide band and having a considerable microwave absorption capability due to its low density, high conductivity, large specific surface area, excellent mechanical properties, and unique EM characteristics [13,14,15,16,17]. SiC coatings have been successfully fabricated by many methods, such as physical vapor deposition (PVD) [23], chemical vapor deposition (CVD) [24], and vacuum plasma spraying technology [25] These methods require long production time and expensive equipment and are heavily environment-dependent. The remarkable oxidation resistance and dielectric properties of SiC/CNTs obtained in high temperature could be a good candidate for preparing high-temperature radar absorbing materials
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