Abstract
Abstract The SiC ceramic was joined via spark plasma sintering (SPS) using 4.5 wt% yttria partially stabilized zirconia (4.5YSZ) powder and 4.5YSZ+20 wt%Al 2 O 3 powder mixture as fillers. The 4.5YSZ powder was synthesized by sol-gel method. The effects of different filler materials on the microstructure and mechanical properties of the SiC joints were investigated. Based on the X-ray diffraction and scanning electron microscope analyses, as well as three-point bend tests, the SiC joint with 4.5YSZ+20 wt%Al 2 O 3 powder mixture as the filler material possesses higher flexural strength of 107.3 MPa at room temperature. The superior flexural strength of the SiC joint using the 4.5YSZ+20 wt%Al 2 O 3 filler is attributed both to the carbothermic reaction and element diffusion at the SiC/4.5YSZ+20 wt%Al 2 O 3 interface during the joining process.
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