Abstract
B 4 C/C(graphite) composites were produced using Hot-pressing. However, the composites exhibited low surface hardness, low wear resistance as well as low oxidation resistance. The hot-pressed B 4 C/C(graphite) composites were processed via silicon infiltration procedure at 1550 °C for 2 h in the vacuum condition to refine the wear resistance, surface hardness, and oxidation resistance of the B 4 C/C(graphite) composites. The silicon infiltration process resulted in the fabrication of a surface layer based on silicon carbide and silicon upon the B 4 C/C(graphite) composites surface. The surface layer of the silicon infiltrated B 4 C/C(graphite) composites, primarily comprising silicon carbide and silicon, was examined for its phase composition and microstructure. The oxidation resistance, wear resistance, and surface hardness of B 4 C/C(graphite) composites subjected to silicon infiltration was additionally examined. The XRD results confirmed that silicon carbide and silicon-based layer existed on the surface of B 4 C/C(graphite) composites, which was produced as a result of the silicon infiltration process. The surface of silicon infiltrated B 4 C/C(graphite) composites exhibited a 300–400 μm thick covering of silicon carbide and silicon. The deposited layer also exhibited a dense and compact microstructure. When compared to hot-pressed B 4 C/C(graphite) composites, the surface hardness and wear resistance of the composites resulting after silicon infiltration were significantly enhanced. Silicon infiltrated B 4 C/C(graphite) composites possess a surface hardness of 16–17 GPa. The oxidation resistance of the silicon infiltrated B 4 C/C(graphite) composites was considerably enhanced as compared to the hot-pressed B 4 C/C(graphite) composites. So the silicon infiltrated B 4 C/C(graphite) composites exhibited high surface hardness, excellent wear resistance and excellent oxidation resistance in comparison with the hot-pressed B 4 C/C(graphite) composites.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
