Abstract
In this comprehensive study, we investigated the macrokinetics of the filtration combustion process of reactive Ti–Si–C mixtures in a nitrogen environment. It was observed that an increase in nitrogen pressure resulted in a rise in combustion temperature (150–600 °C) and combustion rate (2–8 times) due to the improved availability of nitrogen in the combustion front. Combustion yielded Ti(C,N)–Si3N4–SiC ceramic powders with polyhedral-shaped composite particles and a narrow particle size distribution. The hot pressing (HP) of as-synthesized ceramics significantly altered their phase composition due to Si3N4 dissociation. Introduced as a counter-measure, the YAG sintering additives (5–10 %) not only facilitated the preservation of the phase composition during HP but also considerably reduced the porosity of consolidated ceramics from 25-28 % to 0.6–4.8 %. The samples consolidated using the optimized conditions had a dense and uniform microstructure, retained their initial phase composition, and exhibited hardness values up to 13.4 GPa, flexural strength up to 397 MPa, and fracture toughness up to 5.3 MPa × m1/2.
Sign-in/Register to access full text options 
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.
