Effect of reactant Ti/B4C ratio on the stoichiometry and mechanical properties of h-BN–Ti(C,N) prepared by combustion synthesis

• Published in: Materials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 528; no. 6; pp. 2380 - 2384
• Main Authors: Li, Hongbo, Zheng, Yongting, Han, Jiecai, Zhou, Lijuan
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 15.03.2011; Elsevier
• Subjects: Ceramic powders; Ceramics; Combustion synthesis; Combustion temperature; Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; Deformation and plasticity (including yield, ductility, and superplasticity); Exact sciences and technology; h-BN ceramic composite; Materials science; Materials synthesis; materials processing; Mechanical and acoustical properties of condensed matter; Mechanical properties; Mechanical properties of solids; Microstructure; Phase composition; Physics; Powder compacts; Self-propagating synthesis; Stoichiometry; Titanium; Titanium carbonitride; Titanium carbonitride; Mechanical properties; Combustion synthesis; h-BN ceramic composite; XRD; Boron carbide; Fracture toughness; Composite materials; Transition elements; Flexural strength; Powder compaction; Microstructure; Concentration distribution
• ISSN: 0921-5093; 1873-4936
• DOI: 10.1016/j.msea.2010.11.041

▶ Nitrides ceramic composites were fabricated by SHS under high nitrogen pressure. ▶ Nitrogen content in Ti(C,N) was discussed through theoretical and experimental studies. ▶ TiN is the preferential formation phase under high nitrogen pressure, and thus leads to higher N content in Ti(C,N) phase. ▶ The mechanical properties of the products were measured in detail. h-BN–Ti(C,N) ceramic composites were prepared by combustion synthesis from B4C–Ti powder compacts ignited under high gaseous nitrogen pressure. The influences of Ti/B4C ratio in reactant on the combustion temperature and velocity, phase composition and N content in Ti(C,N) phase were analyzed through theoretical and experimental studies. Experimental results show that combustion temperature and velocity increased with the increase of Ti/B4C ratio in reactant. TiN is the preferential formation phase under high nitrogen pressure, which resulted in higher N content in Ti(C,N) phase. Mechanical properties of the composites increased with the increase of Ti/B4C ratio because of higher Ti(C,N) content in products.