Utilization of industrial wastes in Al₂O₃‐SiC‐SiO₂‐C refractories: Characterization of erosion and corrosion resistance

Abstract

Industrial waste has a high potential for reuse in the production of refractories, which can significantly lower costs. The purpose of the research is to access the role of three types of recycled industrial wastes (ferro‐titanium slag [FTS], ferhro‐chromium slag [FCS], and ferro‐vanadium slag [FVS]) utilized as aggregate in the traditional Al2O3‐SiC‐SiO2‐C refractories (ASSC). Erosion and corrosion resistance characterization was performed to determine whether these industrial waste‐containing ASSC still perform better than traditional ASSC during service. Based on the results, incorporating FVS into the ASSC was not recommended, its corrosion resistance was significantly reduced due to the presence of excessive liquid phase. Nonetheless, FTS and FCS could be added as aggregate to the ASSC without affecting their performance. This necessity of the proper amount of liquid phase in ASSC was highlighted in this research since the parameters could alter its properties. Furthermore, the Ti(C,N) transformed from TiO2 in FTS via carbothermal reduction nitridation could effectively prevent further corrosion, and Cr2O3 derived from the decomposition of (Al,Cr)2O3 solid solution in FCS could play the same role during the corrosion process, both of which may be potential raw materials to be used in refractories.

Effect of aggregate type on the mechanical properties and slag resistance of Al2O3‐SiC‐C hot metal ladle bricks

“…The slag corrosion resistance of the samples was as follows: tabular corundum sample > fused brown corundum sample > fused white corundum sample > microporous corundum sample > bauxite sample. Because bauxite contains more impurity phases, it easily reacts with slag at high temperature 21,22 to form a low-melting phase, which aggravates corrosion and penetration of the slag into the refractory. Although the impurity content of the microporous corundum sample is low, there are more pores in the aggregate, and the resintering effect in the experiment may lead to the growth of pores and even cracks, which aggravate the corrosion and penetration of slag into the refractory.…”

Mechanical, morphological, and corrosion features of Ni–Cr oxide nanocomposite coating deposited on SS304 by EPD

“…Moreover, the chemical stability of NiO particles has caused it to be a suitable inhibitor to prevent the substrate reaction with the surrounding environment in coating applications 2,12,13 . Green particles of Cr 2 O 3 with antibacterial features, chemical stability, thermal stability, and high hardness are used in medical fields, improving the corrosion properties of metals at high temperatures and forming wear‐resistant coatings in dry and wet environments 13–17 . Moreover, due to its low‐friction coefficient, Cr oxide is used in the formation of self‐lubricating coatings in order to reduce the wear rate 18–20 .…”