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Preparation, mechanical, dielectric and microwave absorption properties of hierarchical porous SiCnw-Si3N4 composite ceramics.
- Source :
-
Journal of the European Ceramic Society . Aug2022, Vol. 42 Issue 9, p3820-3830. 11p. - Publication Year :
- 2022
-
Abstract
- Herein, hierarchical porous SiC nw -Si 3 N 4 composite ceramics with good electromagnetic absorption properties were prepared. A porous Si 3 N 4 matrix with different pore structures was first prepared by gelcasting-pressureless sintering (G-PLS) and gelcasting combined with particle stabilized foam-pressureless sintering (G-PSF-PLS). SiC nw was then introduced by catalytic chemical vapor deposition (CCVD). An increase in solid loading (25–40 vol%) decreased apparent porosity (47.7–41.3%) and improved flexural strength (142.19–240.36 MPa) and fracture toughness (2.25–3.68 MPa·m1/2). The addition of foam stabilizer propyl gallate (PG, 0.5–1.0 wt%) significantly increased apparent porosity (73.2–86.4%) and realized large-sized spherical pores, reducing flexural strength (58.23–38.56 MPa) and fracture toughness (0.75–0.41 MPa·m1/2). High apparent porosity and large-sized pores facilitated the introduction of SiC nw. The 25 vol% sample exhibited a reflection loss of − 14.67 dB with an effective absorption bandwidth of 3.47 GHz, suggesting a development potential in the electromagnetic wave absorption field. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09552219
- Volume :
- 42
- Issue :
- 9
- Database :
- Academic Search Index
- Journal :
- Journal of the European Ceramic Society
- Publication Type :
- Academic Journal
- Accession number :
- 156228326
- Full Text :
- https://doi.org/10.1016/j.jeurceramsoc.2022.03.031