Influence of sintering process and interfacial bonding mechanism on the mechanical properties of MgO-C refractories

摘要

Two kinds of MgO-C refractories were separately prepared by carbon-embedded method and high-temperature nitridation. The phase compositions, microstructures and physical properties of heat-treated samples were investigated. Specially, the relationship between interface bonding and physical properties was mainly studied. Compared with the carbon-embeded burnt samples, the nitrided samples showed higher porosity, but exhibited better mechanical properties. And a direct chemical bonding interface was formed between Si3N4 and flake graphite in the nitrided samples, which enhanced the driving force between the molecules. Based on the fact, the molecular dynamics simulation of the interface between Si3N4 and flake graphite was carried out by the Material Studio software, and the interface phase relationship was beta-Si3N4 (1 1 0)//graphite (1 0 0).