Effect of In Situ Mg-Sialon on the Oxidation Behavior of Low-Carbon MgO-C Refractories

Abstract

The in situ Mg-sialon in low-carbon MgO-C refractories was studied with respect to its oxidation behavior and mechanism at 1500 °C. The results indicated that the oxidation index and rate constant of low-carbon MgO-C refractories with Mg-sialon were 26.2% and 0.51 × 10−3 cm2/min at 1500 °C for 2 h, respectively. The formation of a dense MgO-Mg2SiO4-MgAl2O4 protective layer contributed to considerable oxidation resistance, and the generation of this thicker layer was due to the combined volume effect of Mg2SiO4 and MgAl2O4. The reduced porosity and more complex pore structure were also found in the refractories with Mg-sialon. Therefore, further oxidation was restricted as the oxygen diffusion path was effectively blocked. This work proves the potential application of Mg-sialon in improving the oxidation resistance of low-carbon MgO-C refractories.

Back to the future with emerging iron technologies

“…Despite their advantages, high production and maintenance costs hinder the widespread adoption of vanadium RFBs, which must be addressed for large-scale energy storage viability. 73,74 China is leading with recent installations of 200 MW/800 MW h and 100 MW/500 MW h vanadium RFBs in Dalian and Hubei provinces. 75 In a related development, a vanadium-chromium RFB (V/Cr RFB) has been developed, combining the benets of all-vanadium and iron-chromium systems.…”