Abstract
The microstructure dependent electromagnetic interference (EMI) shielding properties of nano-layered Ti3AlC2 ceramics were presented in this study by comparing the shielding properties of various Ti3AlC2 ceramics with distinct microstructures. Results indicate that Ti3AlC2 ceramics with dense microstructure and coarse grains are more favourable for superior EMI shielding efficiency. High EMI shielding effectiveness over 40 dB at the whole Ku-band frequency range was achieved in Ti3AlC2 ceramics by microstructure optimization, and the high shielding effectiveness were well maintained up to 600 °C. A further investigation reveals that only the absorption loss displays variations upon modifying microstructure by allowing more extensive multiple reflections in coarse layered grains. Moreover, the absorption loss of Ti3AlC2 was found to be much higher than those of highly conductive TiC ceramics without layered structure. These results demonstrate that nano-layered MAX phase ceramics are promising candidates of high-temperature structural EMI shielding materials and provide insightful suggestions for achieving high EMI shielding efficiency in other ceramic-based shielding materials.
Highlights
Electromagnetic interference (EMI), which could cause detrimental effects on the performance of electronic devices, has drawn growing attentions with the repaid development of highly sensitive circuits[1,2]
MAX phase ceramics which represent a class of layered ternary transition-metal carbides and nitrides with a general formula of Mn+1AXn15 are ideal candidates of high-temperature structural electromagnetic interference (EMI) shielding materials owning to their satisfactory mechanical properties, intrinsically superior electrical conductivity and the nano-layered structure[15,16]
It was found that the EMI shielding properties of Ti3AlC2 ceramics display remarkable microstructure dependences
Summary
Electromagnetic interference (EMI), which could cause detrimental effects on the performance of electronic devices, has drawn growing attentions with the repaid development of highly sensitive circuits[1,2]. It is of great interest to explore intrinsically conductive ceramics as effective high-temperature EMI shielding materials. MAX phase ceramics which represent a class of layered ternary transition-metal carbides and nitrides with a general formula of Mn+1AXn (wherein M is an early transition metal, A is an A-group element, X is either C or N, and n varies from 1 to 3)[15] are ideal candidates of high-temperature structural EMI shielding materials owning to their satisfactory mechanical properties, intrinsically superior electrical conductivity and the nano-layered structure[15,16]. Ti3AlC2 and Ti3SiC2 are two most studied MAX phases and both have been reported to exhibit high EMI SE17,18. The EMI shielding properties of highly conductive TiC ceramics without nano-layered structure were examined. The influences of microstructure on the high-temperature EMI shielding properties were investigated systematically, and the mechanisms for high EMI SE in Ti3AlC2 ceramics were presented
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