Review of corrosion of refractory in gaseous environment
In this paper corrosion of refractories in gaseous environments is reviewed. The corrosion mechanisms of alumina refractories including alumino‐silicates and zirconia as oxide and silicon carbide as non‐oxide refractory are emphasized due to their broad array of applications.
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Fundamentals on Corrosion Behavior of Refractories. Instructors Christos Aneziris Technical University Freiberg Germany Jacques. Poirier University of Orleans France. One main focus is the iron and steel industry but other high temperature processes are discussed. Fundamental mechanisms of corrosion and the solutions to limit the
Chat OnlineChemical Compatibility and High Temperature Limits for
COMPATIBILITY WITH REFRACTORY METALS Up to lithium velocities of 6m/s the temperature limit for acceptable corrosion for Nb alloys is 1250ºC while that for Ta alloys is 1350ºC. T (ºC) ∆T (ºC) Time (hr) Li velocity (m/s) corrosion rate (µm/yr) 1100 200 10 000 3-6 negligible 1200 200 1 550 3-4 negligible 1297 179 3 000 .05 7.5 1073
Chat OnlineAnalysis and Prediction of Corrosion of Refractory
Oct 23 2020 · The corrosion mechanism of Na 2 CO 3 Na 2 SO 4 and NaCl on refractory materials at different temperatures (600 °C–1200 °C with a temperature step of 100 °C) was investigated. The refractory materials components of MgO·Cr 2 O 3 MgO·Al 2 O 3 Al 2 O 3 MgO and Cr 2 O 3 and 3-sodium salts of 1mol were input in the table of the FactSage
Chat OnlineMechanisms of silica refractory corrosion in glass-melting
Corrosion of refractory silica brick used to line the roof or crown of many-glass-melting furnaces is a serious problem in furnaces using oxygen-fuel rather than air-fuel. In this work the authors report equilibrium calculations for the Na sub 2 O-SiO sub 2 system that predict the formation of a variable-composition liquid-solution phase as a function of key furnace variables.
Chat OnlineHigh-temperature corrosionWikipedia
High-temperature corrosion is a mechanism of corrosion that takes place in gas turbines diesel engines furnaces or other machinery coming in contact with hot gas containing certain contaminants. Fuel sometimes contains vanadium compounds or sulfates which can form compounds during combustion having a low melting point.
Chat OnlineAn investigation into the wear mechanisms of carbon- and
Refractory wear mechanisms in a submerged arc furnace (SAF) producing manganese ferroalloys may also include densification and spalling. Densification is caused by slag or alloy infiltrating pores and/or reacting with the refractory material.
Chat OnlineCorrosion Mechanism Analysis of Al2O3-SiC-C Castable
The present study aims to analyze the corrosion mechanism of Al2O3-SiC-C castables for blast furnace main trough. The anti-oxidation and corrosion properties of the castable caused by slag were studied with residual lining investigation and microstructure analysis. A rapid recognition of grain distribution ingredients and mineral phases was achieved by using cathodoluminescence (CL) in
Chat OnlineRefractory metals and nickel in high temperature chlorine
Refractory metals and nickel in high temperature chlorine‐containing environments ‐ thermodynamic prediction of volatile corrosion products and surface reaction mechanisms a review One such case are high temperature chlorine corrosion conditions. This paper reviews the literature on the corrosion mechanisms and kinetics of nickel
Chat OnlineMicrostructures and Corrosion Mechanisms in MgO-C Bricks
Due to the high temperatures of the process these refractories are subjected to severe wear and corrosion processes principally in the area of contact with the slag. These slags have variable contents of CaO SiO 2 Al 2 O 3 MgO and FeO varying in composition according to the process stage.
Chat OnlineHIGH TEMPERATURE MECHANICAL PROPERTIES OF A Si3
temperature fracture resistance of more than 10 MPam0.5 and fracture strength higher than 1 GPa have been achieved 1 2 . As regards the high-temperature properties these are controlled mainly by sintering aids as MgO Al2O3 Y2O3 or Y2O3 and Yb2O3. Yttria and ytterbia have been found most refractory at high temperatures and are preferred for
Chat OnlineMicrostructures and Corrosion Mechanisms in MgO-C Bricks
Due to the high temperatures of the process these refractories are subjected to severe wear and corrosion processes principally in the area of contact with the slag. These slags have variable contents of CaO SiO 2 Al 2 O 3 MgO and FeO varying in composition according to the process stage.
Chat OnlineAn investigation into the wear mechanisms of carbon- and
Refractory wear mechanisms in a submerged arc furnace (SAF) producing manganese ferroalloys may also include densification and spalling. Densification is caused by slag or alloy infiltrating pores and/or reacting with the refractory material.
Chat OnlineImpact of Temperature and Oxygen Partial Pressure on
Mechanisms of SiC Refractory High Temperature Corrosion by Molten Salts (Na K Ca Cl S) in Waste to Energy Facilities p.272 Microstructures and Corrosion Mechanisms in MgO-C Bricks in Contact with High-Basicity and FeO-Rich Slags
Chat OnlineUltra-high-temperature ceramicsWikipedia
Ultra-high-temperature ceramics (UHTCs) are a class of refractory ceramics that offer excellent stability at temperatures exceeding 2000 °C being investigated as possible thermal protection system (TPS) materials coatings for materials subjected to high temperatures and bulk materials for heating elements. Broadly speaking UHTCs are borides carbides nitrides and oxides of early
Chat OnlineHIGH TEMPERATURE ALKALI CORROSION OF DENSE SIC
as well as to improve high temperature mechanical properties. The research will not only develop and characterize CMZP and Mg-A12Ti05 coatings but will also strive to expand the existing knowledge of the mechanism of coal combustion corrosion of Sic in the temperature range of 1000-1 400°C.
Chat OnlineCorrosion mechanism of Al2O3–SiC–C refractory by SiO2–MgO
Dec 15 2020 · The mechanism of corrosion and penetration varies with the composition of slag and microstructure of refractory. The corrosion and penetration of the high-alumina refractory is more severe for SiO 2 –MgO-based slag than CaO–SiO 2 –Al 2 O 3 -based slag.
Chat OnlineReview of corrosion of refractory in gaseous environment
In this paper corrosion of refractories in gaseous environments is reviewed. The corrosion mechanisms of alumina refractories including alumino‐silicates and zirconia as oxide and silicon carbide as non‐oxide refractory are emphasized due to their broad array of applications.
Chat OnlineCorrosion characteristics of silicon carbide and silicon
Corrosion Characteristics of Silicon Carbide and Silicon Nitride Volume 98 Number 5 September-October 1993 Characteristics such as high maximum use temperature strength retention at high tem- perature and chemical stability have held forth mechanisms. It was noted in an early work that the formation of Si02 on the surface Fig. 2 was
Chat OnlineMelt Corrosion of Refractories SpringerLink
Direct and indirect corrosion mechanisms of solids by liquids at high temperature and experimental techniques used to study them are discussed. These include accelerated static/dynamic corrosion tests post mortem characterisation of corroded microstructures thermodynamic calculations and phase equilibrium diagrams.
Chat OnlineHigh-temperature corrosion of silicon carbide ceramics by
Jan 01 2014 · Therefore spalling as a corrosion mechanism is less likely in these materials than in oxide refractories. 4. Conclusions. Recrystallised SiC and sintered silicon carbide (SSiC) were investigated in different coal ashes in a reducing carbon monoxide- and hydrogen-containing atmosphere at temperatures between 1000 °C and 1300 °C.
Chat OnlineCorrosion Mechanism Analysis of Al2O3-SiC-C Castable
The present study aims to analyze the corrosion mechanism of Al2O3-SiC-C castables for blast furnace main trough. The anti-oxidation and corrosion properties of the castable caused by slag were studied with residual lining investigation and microstructure analysis. A rapid recognition of grain distribution ingredients and mineral phases was achieved by using cathodoluminescence (CL) in
Chat OnlineAnalysis and Prediction of Corrosion of Refractory
Oct 23 2020 · The corrosion mechanism of Na 2 CO 3 Na 2 SO 4 and NaCl on refractory materials at different temperatures (600 °C–1200 °C with a temperature step of 100 °C) was investigated. The refractory materials components of MgO·Cr 2 O 3 MgO·Al 2 O 3 Al 2 O 3 MgO and Cr 2 O 3 and 3-sodium salts of 1mol were input in the table of the FactSage
Chat OnlineStudy of Reactive Impregnation and Phase Transformations
Corrosion of refractories results from reactive transport namely transport of agents and chemical reactions of these agents with impregnated medium. On one hand the transport involves either diffusion or impregnation depending on the state of the corrosive agents and the microstructure of the host media.
Chat OnlineAnalysis and Prediction of Corrosion of Refractory
Oct 23 2020 · The corrosion mechanism of Na 2 CO 3 Na 2 SO 4 and NaCl on refractory materials at different temperatures (600 °C–1200 °C with a temperature step of 100 °C) was investigated. The refractory materials components of MgO·Cr 2 O 3 MgO·Al 2 O 3 Al 2 O 3 MgO and Cr 2 O 3 and 3-sodium salts of 1mol were input in the table of the FactSage
Chat OnlineCoatings Free Full-Text An Overview on Corrosion
High SiC refractory linings have been used to prevent heavy slagging of molten ash (so-called clinker melting point 1200–1300 °C) in high-temperature zones of the furnace and the clinker can be easily removed without damage of refractory linings. An example of clinker growth in the furnace made by fireclay bricks is shown in Figure 11
Chat OnlineSurface oxidation mechanism of a refractory high-entropy
May 09 2019 · High-entropy alloys (HEAs) synthesized using refractory elements are being strongly considered as candidates for high temperature structural applications. The role of compositional changes of HEA
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