Advanced Al2O3–SiC–SiO2–C refractories with B2O3 addition

Aggregates are important factors that determine the performance of refractory materials. To explore the influence of aggregate types on refractory material properties, Al2O3‐SiC‐C bricks were prepared using bauxite, fused brown corundum, tabular corundum, fused white corundum, and microporous corundum with particle sizes of 5–3, 3–1, and ≤1 mm as aggregates, fused white corundum (≤.075 mm), SiC (≤.075 mm), or flake graphite (≤.15 mm) as the matrix, and a thermoset phenolic resin as the binder. Understanding the effects of the aggregate type on the mechanical properties and slag resistance of Al2O3‐SiC‐C bricks provides a theoretical basis for the selection of different aggregates during production. The results showed that the Al2O3‐SiC‐C brick had good high‐temperature mechanical properties and slag resistance when tabular corundum was used as an aggregate, owing to its high density and low content of cracks and impurity phases. When bauxite was used as an aggregate, its high‐temperature mechanical properties and slag resistance were poor, owing to its high porosity and impurity content.

Section: Resultsmentioning

confidence: 99%

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

Gao,

Nie,

et al. 2023

“…And sample CS with modest levels of the liquid phase had better I e compared to sample BS. However, the increased liquid phase flowed in sample VS during high temperature produced the skeletal strength reduction and component distortion, 24 resulting in a substantially larger I e .…”

Section: Discussionmentioning

confidence: 99%

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

Cheng²,

Xia³

et al. 2023

Self Cite

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.

“…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][14][15][16][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][19][20] Ni and Cr oxide nanoparticles interact with bacteria by releasing Ni 2+ and Cr 3+ ions to interrupt or hinder the growth of bacteria.…”

Section: Introductionmentioning

confidence: 99%

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

Mohammadzadeh,

Jafari,

Azargoon

2024

Ceramic composites are suitable materials to improve the surface characteristics of steel. Therefore, in this research, Ni–Cr oxide nanocomposite was coated on 304 stainless steel (SS304) by the electrophoretic approach. The effect of chemical composition and coating parameters (time and voltage) was investigated on morphology, corrosion, microhardness, and wear behavior. The nanocomposites were successfully synthesized in three different compositions (Ni–Cr oxides of 70–30, 60–40, and 50–50). The products were coated on the SS304 in 1, 2, and 3 min and 90, 110, and 130 V. Fourier‐transform infrared spectroscopy, X‐ray diffraction, transmission electron microscope, and field emission scanning electron microscopy analyses were employed to investigate the characteristics of the synthesized powder and resulting coatings. The hardness, wear properties, and corrosion resistance of the coating were studied by microhardness, ball‐on‐disk, electrochemical impedance spectroscopy, and polarization methods. The coatings deposited at 1 min and 110 V were sound and free of microcracks. The wear resistance increased by increasing Cr%, so the 50–50 coating showed the best wear resistance with a friction coefficient of .763 and wear mass of 1.6 mg. However, the coating 70–30 presented the highest microhardness of 180.28 Hv. The coating 60–40 had the best corrosion resistance with a corrosion current density of 5.92 µA/cm2. The corrosion resistance improved for thicker coatings.