Toward a low‐temperature sintering of carbon fiber toughened high entropy boride composite with Co addition
Abstract Dense C f /(ZrHfNbTaCr)B 2 –SiC (CBS‐Co) composite is successfully prepared at a low temperature of 1500°C by adding 5 vol.% Co. Liquid Co accelerates the particle rearrangement and significantly enhances the relative density of CBS‐Co (95.2%). In situ formed Co 2 B phase by diffusion react...
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Published in | International journal of applied ceramic technology |
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Main Authors | , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
28.09.2024
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Online Access | Get full text |
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Summary: | Abstract Dense C f /(ZrHfNbTaCr)B 2 –SiC (CBS‐Co) composite is successfully prepared at a low temperature of 1500°C by adding 5 vol.% Co. Liquid Co accelerates the particle rearrangement and significantly enhances the relative density of CBS‐Co (95.2%). In situ formed Co 2 B phase by diffusion reaction bonds tightly with high entropy diboride (HEB) and SiC grains in CBS‐Co. Due to the promotion of relative density and interfacial bonding strength, CBS‐Co exhibits a high flexural strength (283 ± 23 MPa). Structural damages of carbon fibers are effectively prevented by compact fiber coating. The well‐preserved fibers play dominant roles to increase the fracture toughness of CBS‐Co (4.77 ± .5 MPa·m 1/2 ). Moreover, SiO 2 ‐rich oxide layer can effectively heal flaws and inhibit oxygen diffusion, achieving relatively high flexural strength after oxidation at 1300°C of CBS‐Co composite. This work provides a stepping stone for developing high‐performance carbon fiber toughened HEB composites based on low temperature liquid‐phase sintering technology. |
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ISSN: | 1546-542X 1744-7402 |
DOI: | 10.1111/ijac.14943 |