The effects of sintering temperature on the morphology and physical properties of in situ Si3N4 bonded MgO–C refractory
Source abstract
Abstract
Abstract Si3N4 bonded MgO–C refractory was formed in situ using silicon powder as a raw material through the nitriding processing. The effects of sintering temperature on the microstructural evolution and physical properties of the in situ formed Si3N4 bonded MgO–C refractory were investigated. The results showed that α–Si3N4 and β–Si3N4 were generated from the reaction of Si–N2 in MgO–C refractories at 1450 °C. The β–Si3N4 phase was the major ceramic bonding phase which connects neighbouring MgO and graphite particles. Rod–like β–Si3N4 crystals with conical tips were formed by the direct nitriding of liquid silicon following a vapor-liquid-solid growth mechanism in the initial stage which was followed by a vapor-solid reaction at elevated temperatures. Based on the determined characteristic properties of the specimens, 1500 °C is the best sintering temperature for the in situ formation of Si3N4 in MgO–C refractory.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Advanced ceramic materials synthesis · Advanced materials and composites · MXene and MAX Phase Materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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