Production of carbon-containing refractory materials based on chromium-containing raw materials in the SV-synthesis mode
DOI:
https://doi.org/10.18321/cpc407Keywords:
chromite and zircon concentrates, carboncontaining refractory materials, MAX-phases, selfpropagating high-temperature synthesis (SHS).Abstract
The paper describes the study of technologies and the synthesis of composites containing hightemperature carbides and MAX-phases, which increase the technical and chemical properties of refractories. Using the unique properties of chromite and zircon concentrates, carboncontaining refractory materials were obtained by the method of self-propagating high-temperature synthesis (SHS). Experimental studies are analyzed and summarized. The phase and chemical composition of the obtained carbon-containing composites was determined and the strength characteristics were measured. The most stable and useful ZrC and SiC were formed in the zircon concentrate, and the chromite concentrate has a high oxidizing ability, which allows reaching high synthesis temperatures. The study of the obtained composites showed that in the process of SHsynthesis in a carbon medium, MAX-phases of the CrxSiyCz, Cr2SiC, Cr5Si, SiC type were formed, which enhance the technical and chemical properties of refractory materials. The optimal composition of a refractory material based on a combination of chromite and zircon concentrates, containing 15 wt.% graphite and 18 wt.% aluminum powder, at which a maximum strength was observed (20-25 MPa), had been determined.
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