Spark plasma sintering of ceramic matrix composite based on alumina, reinforced by carbon nanotubes

International Conference "Modern Technologies and Materials of New Generations"

Leonov, A.A.^1 ; Khasanov, A.O.^1 ; Danchenko, V.A.^1 ; Khasanov, O.L.^1

Department of Nanomaterials and Nanotechnologies, National Research Tomsk Polytechnic University, 30 Lenin Ave., Tomsk

634050, Russia^1

关键词: Alumina composites;    Alumina grains;    Based on alumina;    Crack deflections;    Microstructure and mechanical properties;    Microstructure observation;    Reinforcing mechanism;    Sintering temperatures;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/286/1/012034/pdf
DOI  :  10.1088/1757-899X/286/1/012034

来源: IOP

【 摘 要 】

Alumina composites reinforced with 3 vol.% multi-walled carbon nanotubes (MWCNTs) were prepared by spark plasma sintering (SPS). The influence of sintering temperature (1400-1600 °C) on the composites microstructure and mechanical properties was investigated. Microstructure observations of the composite shows that some CNTs site along alumina grains boundary, while others embed into the alumina grains and shows that CNTs bonded strongly with the alumina matrix contributing to fracture toughness and microhardness increase. MWCNTs reinforcing mechanisms including CNT pull-out and crack deflection were directly observed by scanning electron microscope (SEM). For Al2O3/CNT composite sintered at 1600 °C, fracture toughness and microhardness are 4.93 MPa•m1/2and 23.26 GPa respectively.