Self-propagating high temperature synthesis (SHS) of ZrC-TiC nanocomposites: Comparison of Mg and Al reductant usage and process optimization
Journal of the Australian Ceramic Society, cilt.60, sa.5, ss.1541-1555, 2024 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 60 Sayı: 5
- Basım Tarihi: 2024
- Doi Numarası: 10.1007/s41779-024-01062-2
- Dergi Adı: Journal of the Australian Ceramic Society
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Aerospace Database, Communication Abstracts, Metadex, Civil Engineering Abstracts
- Sayfa Sayıları: ss.1541-1555
- Anahtar Kelimeler: Aluminium oxide, Combustion synthesis, Nano composite, Titanium carbide, Zirconium carbide
- İstanbul Medipol Üniversitesi Adresli: Evet
Özet
This study investigated the production of ZrC-TiC composite nanopowders by SHS process in TiO2-ZrO2-C-Mg/Al systems. Mg and Al charge stoichiometries and composite charge stoichiometries were optimized for SHS processes. The most precise procedural stages were identified for refining the SHS product; acid concentrations were optimized for Mg usage and an innovative chemical method was developed to eliminate and/or decrease the amount of Al2O3 by-product, enabling the utilization of Al. Thermochemical simulations were conducted for thermodynamic evaluations (adiabatic temperature and specific heat) and characterizations were performed by XRD and SEM-EDS analysis. The findings indicated that utilizing both reductants allowed for the synthesis of ZrC-TiC-(Al2O3) particles that have considerable surface area and commercial purity. The outcomes demonstrated that Magnesium is a more effective reductant, yet Aluminium, also serves as a viable reductant, even though leading to an increase in process steps, but enabling in-situ formation of sinterability and toughness enhancing Al2O3. A novel chemical route including pre-acid leaching, NaOH fusion, water leaching, HCl leaching was identified for the synthesis of ZrC-TiC-Al2O3 composite powder where the amount of Al2O3 could be organized (according to the desired mechanical properties) by optimization.