TY - JOUR
T1 - Electromagnetic interference shielding performance of alternatively-deposited multilayer SiC/PyC porous ceramics
AU - Nan, Beiya
AU - Liu, Yongsheng
AU - You, Qiangwei
AU - Li, Jingxin
AU - Ye, Fang
AU - Cheng, Laifei
N1 - Publisher Copyright:
© 2019 Elsevier Ltd and Techna Group S.r.l.
PY - 2019/12/1
Y1 - 2019/12/1
N2 - Herein, alternatively-deposited multilayer SiC/pyrolytic carbon (PyC) porous ceramics are fabricated by low-pressure chemical vapor infiltration (LPCVI) method, using nickel (Ni) foam as template. The influence of number of deposition layers (n) on morphology, physical properties, electrical conductivity, and electromagnetic properties of the porous ceramics was systematically investigated. The results revealed that the density of as-prepared SiC/PyC porous ceramics increased from 0.376 g/cm3 to 0.863 g/cm3, whereas the porosity decreased from 86.97% to 70.24% with increasing number of alternately-deposited SiC and PyC layers. Moreover, electrical conductivity and shielding effectiveness gradually increased with increasing number of deposition layers. At n = 6, the electrical conductivity of SiC/PyC porous ceramics increased to 0.289 S/cm, meanwhile room-temperature average total shielding and absorption effectiveness values increased to 26.7 dB and 16 dB, respectively, corresponding to an increase of 44.32% and 58.42% as compared to the sample of n = 0 (AS). In addition, total specific shielding effectiveness of AS and PS2-PS6 samples ranged from 30 to 50 dB cm3/g, and gradually decreased with increasing number of deposition layers. Lastly, high-temperature shielding effectiveness has been assessed in the temperature range of 25 to 600 °C. Excellent stability has been rendered by alternatively-deposited multilayer SiC/PyC porous ceramics.
AB - Herein, alternatively-deposited multilayer SiC/pyrolytic carbon (PyC) porous ceramics are fabricated by low-pressure chemical vapor infiltration (LPCVI) method, using nickel (Ni) foam as template. The influence of number of deposition layers (n) on morphology, physical properties, electrical conductivity, and electromagnetic properties of the porous ceramics was systematically investigated. The results revealed that the density of as-prepared SiC/PyC porous ceramics increased from 0.376 g/cm3 to 0.863 g/cm3, whereas the porosity decreased from 86.97% to 70.24% with increasing number of alternately-deposited SiC and PyC layers. Moreover, electrical conductivity and shielding effectiveness gradually increased with increasing number of deposition layers. At n = 6, the electrical conductivity of SiC/PyC porous ceramics increased to 0.289 S/cm, meanwhile room-temperature average total shielding and absorption effectiveness values increased to 26.7 dB and 16 dB, respectively, corresponding to an increase of 44.32% and 58.42% as compared to the sample of n = 0 (AS). In addition, total specific shielding effectiveness of AS and PS2-PS6 samples ranged from 30 to 50 dB cm3/g, and gradually decreased with increasing number of deposition layers. Lastly, high-temperature shielding effectiveness has been assessed in the temperature range of 25 to 600 °C. Excellent stability has been rendered by alternatively-deposited multilayer SiC/PyC porous ceramics.
KW - Alternatively-deposited multilayer SiC/PyC porous ceramics
KW - Electrical conductivity
KW - Electromagnetic interference shielding
KW - Specific shielding effectiveness
UR - http://www.scopus.com/inward/record.url?scp=85069041857&partnerID=8YFLogxK
U2 - 10.1016/j.ceramint.2019.07.139
DO - 10.1016/j.ceramint.2019.07.139
M3 - 文章
AN - SCOPUS:85069041857
SN - 0272-8842
VL - 45
SP - 21483
EP - 21490
JO - Ceramics International
JF - Ceramics International
IS - 17
ER -