AI Article Synopsis
- The study investigated the bonding of carbon-coated porous BN/SiN ceramics with SiCo38 filler, focusing on the formation of silicon carbide nanowires and their impact on joint strength.
- The highest bond strength achieved was about 89 MPa at 1340 °C for carbon-coated joints, significantly higher than the 38 MPa for non-coated ones.
- Silicon carbide nanowires formed through a chemical reaction during the heating process provided a bridging effect in the joints, enhancing their structural integrity.
Article Abstract
Porous BN/SiN ceramics carbon-coated by carbon coating were joined with SiCo38 (wt. %) filler. The formation process and strengthening mechanism of silicon carbide nanowires to the joint were analyzed in detail. The outcome manifests that there is no distinct phase change in the porous BN/SiN ceramic without carbon-coated joint. The highest joint strength was obtained at 1320 °C (~38 MPa). However, a larger number of silicon carbide nanowires were generated in the carbon-coated joints. The highest joint strength of the carbon-coated joint was ~89 MPa at 1340 °C. Specifically, silicon carbide nanowires were formed by the reaction of the carbon coated on the porous BN/SiN ceramic with the SiCo38 filler via the Vapor-Liquid-Solid (VLS) method and established a bridge in the joint. It grows on the β-SiC (111) crystal plane and the interplanar spacing is 0.254 nm. It has a bamboo-like shape with a resemblance to alloy balls on the ends, and its surface is coated with SiO. The improved carbon-coated porous BN/SiN joint strength is possibly ascribed to the bridging of nanowires in the joint.
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Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8875731 | PMC |
| http://dx.doi.org/10.3390/ma15041289 | DOI Listing |
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