Papersrefractories worldforum
Corrosion Behaviour of Refractory Materials in the Systems Cr2O3 and Cr2O3Al2O3 against Glass Melts in Subject to their Composition and the Thermal Conditions M Freund Volume 2 Issue 3 Pages 9396 Keywords corrosion Cr2O3 refractories Cr3O3 Al2O3 refractories Abstract References Full Article
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Evolution of in Situ Refractories in the 20th Century
A common theme over the past 100 years in refractories science and technology has been to generate a protective refractories layer in a high‐temperature container often by reaction of the refractory materials with the contents glass slag or atmosphere
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Dynamic corrosion of refractories by Na2CO3
Dynamic corrosion of refractories by Na 2 CO 3 Yu Xiang1 a Ying Zhao1 b Lu Liu1 c Zongming Zheng1 Changqing Dong1 1 North China Electric Power University Beijing China axiang yu1991 163 bzhaoying 1999 sohu c qq Keywords dynamics refractories Na 2 CO 3 Abstract The corrosion of refractories by Na 2 CO 3 at high temperature has
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The influence of MgO/ZrO2/Al2O3 refractories on the
Huang et al 9 10 studied the corrosion mechanism of alumina magnesium refractories under dynamic smelting conditions and its influence on the cleanliness of molten steel The results show that the content of alloying elements in molten steel is stable and the corrosion of the castable increases the total oxygen content and inclusions in the steel
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Corrosion behavior of ZrO2–SiO2–Al2O3 refractories in lead
Abstract High temperature 1200–1350 °C corrosion of fused cast ZrO 2 –Al 2 O 3 –SiO 2 ZAS refractory contacting lead silicate glass melt LSG containing 68 5 wt PbO was investigated by scanning electron microscopy SEM energy dispersive spectroscopy EDS differential scanning calorimetry DSC x ray diffraction XRD thickness measurement and Archimedes density
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Degradation mechanism of Cr2O3‐Al2O3‐ZrO2 refractories
Durability and corrosion behavior of refractory lining a core part of a commercial water coal slurry gasifier largely determine its gas yield rate and carbon conversion rate In this work corrosion behavior of high chromite containing refractory served for 4200 hours in a water coal slurry gasifier was studied and the role of generated stress cracks on its degradation behavior was elucidated
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Refractory liner materials used in slagging gasifiers
These liner materials are made of high Cr2O3 and lower levels of Al2O3 and/or ZrO2 As a working face lining in the gasifier refractories are exposed to molten slags at elevated temperature that originate from ash in the carbon feedstock including coal and/or petroleum coke
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Dynamic corrosion of Al2O3–ZrO2–SiO2 and Cr2O3
In this work results on dynamic corrosion studies of fused cast Al 2 O 3 –SiO 2 –ZrO 2 and isostatically pressed and sintered Cr 2 O 3 based refractories by two crystalline transparent frits are described Experiments have been performed using the Merry Go Round test at ≅1500 °C Microstructural and mineralogical analyses of selected areas from the corroded regions of the
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Papersrefractories worldforum
Corrosion Behaviour of Refractory Materials in the Systems Cr2O3 and Cr2O3Al2O3 against Glass Melts in Subject to their Composition and the Thermal Conditions M Freund Volume 2 Issue 3 Pages 9396 Keywords corrosion Cr2O3 refractories Cr3O3 Al2O3 refractories Abstract References Full Article
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Dynamic corrosion of Al2O3–ZrO2–SiO2 and Cr2O3
Dynamic corrosion tests have proved the high corrosion resistance of high chromia refractories by soda lime glasses at 1450 and 1550 °C 2 3 Against this background the objective of this work has been to analyse the corrosion process of four commercial refractories by two different crystalline frits with characteristic compositions of low
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Aluminium Recycling Furnace Refractories911 Metallurgist
The 70 and 90 pct Al2O3 refractories that were treated with phosphoric acid or coated with spinel mortar and fired to 1 000° F showed no corundum development or metal penetration Table 4 lists the results of exposures of refractory samples to a high purity aluminum melt a recycling alloy melt 0 6 to 1 0 Mg and a high magnesium 2 5 to 3
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Refractories and Classification of RefractoriesIspatGuru
Refractories and Classification of Refractories Refractories are inorganic nonmetallic porous and heterogeneous materials composed of thermally stable mineral aggregates a binder phase and additives The principal raw materials used in the production of refractories are normally the oxides of silicon aluminum magnesium calcium and zirconium
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Dynamic corrosion of Al2O3–ZrO2–SiO2 and Cr2O3
Corrosion of Cr 2 O 3 based refractories is controlled by the capillar penetration of the molten frit through the open pores The corrosion process occurs by dissolution of Cr 2 O 3 in the frit followed by the formation of a protective spinel ZnCr 2 O 4 layer by precipitation once the solubility limit of spinel in the resulting glass is reached The formed spinel layer acts as a physical barrier for the penetration of
Get PriceA new ternary phase in the system CaO–Al2O3–Cr2O3
Polycrystalline material of a novel phase in the system CaO–Al2O3–Cr2O3 has been obtained by solid state reactions Chemical analysis indicated the
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Degradation mechanism of Cr2O3‐Al2O3‐ZrO2
Degradation mechanism of Cr2O3‐Al2O3‐ZrO2 refractories in a coal‐water slurry gasifier Role of stress Journal of the American Ceramic Society IF 3 502 Pub Date DOI 10 1111 Junfeng Chen Junli Xiao Yu Zhang Yaowu Wei Youqi Li Shaowei Zhang Nan Li
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The influence of MgO/ZrO2/Al2O3 refractories on the
The mass transfer coefficients of MgO k MgO = 1 0 10 4 m/s Al 2 O 3 k Al2O3 = 2 0 10 4 m/s and ZrO 2 k ZrO2 = 1 1 10 4 m/s refractories were obtained by experiment and kinetic model It is expected that current research can provide guidance for the selection of refractories in the steel industry and provide a way for the kinetics
Get PriceAnalysis and Prediction of Corrosion of Refractory
A thermodynamics method was used to study the thermodynamic properties of three common sodium salts NaCl Na2CO3 and Na2SO4 on the corrosion of refractory materials MgO Cr2O3 MgO Al2O3 Al2O3 MgO and Cr2O3 The results determined that MgO has the best corrosion resistance and is not corroded by the three sodium salts
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The mechanism of corrosion of Aluminium Zirconium Silicate
Physical and chemical stability of regenerator materials is crucial Fused cast cruciform refractory materials made up of Al2 O 3 ZrO 2 and SiO 2 AZS are used in this application The corrosion rate of an AZS refractory is proportional to its porosity and composition
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THERMOCHEMICAL MODELING OF REFRACTORY CORROSION
osti gov conference thermochemical modeling of refractory corrosion in slagging coal gasifiers in support of development of improved refractory material
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Improving Corrosion Behaviour of Magnesia chrome Refractories by Addition of Nanoparticles Farhad Golestani Fard Ali Talimian School of Metallurgy and Materials Engineering Iran University of Science and Technology Tehran/Iran Revision 17 10 2013 24 01 2014 Volume 6 Issue 2 Pages 9398 Abstract
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Dynamic corrosion of Al2O3–ZrO2–SiO2 and Cr2O3
Two refractories of each quality AZS and Cr 2 O 3 based have been chosen to determine the basic mechanisms as well as the influence of microstructural features on corrosion The Merry Go Round test currently used in the glass industry has been chosen for corrosion
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Investigation of the effect of Cr2O3 2 TiO2 coating on
Güney B Mutlu İ Wear and corrosion resistance of Cr2O3 40 TiO2 coating on gray cast iron by plasma spray technique Materials Research Express 6 096577 2019 62 Erdemir A
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Solubility of refractory oxides in soda lime glass
A method for measuring the solubility limit of refractory oxides in glass is presented and the solubilities of Al2O3 ZrO2 SnO2 and Cr2O3 in soda lime glass are given as a function of temperature The order of solubility in soda lime glass is Al2O3ZrO2SnO2Cr2O3 at 1300° to 16Q0°C The solubility of ZrO2 in Al2O3 saturated soda lime glass is much lower than that in pure soda lime glass
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The Role of Graphite in Refractories such as Al2O3/MgO/C
C refractories are composed of corundum mullite Al 2 O 3 and graphite EDS data graphite carbon was oxidized over 90 and no graphite carbon was found in the interface between deteriorative layer of the refractory and slag film Corrosion mechanism of AC refractories in the smelting reduction melts with iron bath 1 graphite oxidization
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PDF Reaction Mechanism in Alumina/Chromia Al2O3 Cr2O3
J Am Ceram Soc 83 8 203640 2000 journal Reaction Mechanism in Alumina/Chromia Al2O3–Cr2O3 Solid Solutions Obtained by Coprecipitation Federica Bondioli Anna Maria Ferrari Cristina Leonelli and Tiziano Manfredini Department of Chemistry Faculty of Engineering University of Modena 41100 Modena Italy Laura Linati Centro Grandi Strumenti University of Pavia 27100 Pavia
Get PriceCorrosion mechanism of Cr2O3 Al2O3 ZrO2 refractories in a
Corroded microstructures were examined in detail and the corrosion mechanism governing the corrosion process was discussed which would be beneficial to the prediction of the durability of Cr 2 O 3 Al 2 O 3 ZrO 2 refractories under the complex corrosion
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PPTCorrosion of Inorganic Non Metallic Materials part 2
MgO 2O3 fusion cast corundum/badelleyite r no open pores a Al2O3 ZrO2 SiO2 glass phase acid neutral basic 8 Corrosion of refractories in melts influence of density or surface tension gradient t0 tgt0 9 Testing of corrosion resistance 10 Corrosion of refractories in atmosphere corrosion leading to mechanical degradation
Get PriceDynamic and static corrosion of alpha alumina bonded
Abstract The corrosion behaviour of sintered high purity α Al2O3 refractory composition in contact with soda lime silicate SLS glass has been investigated using a dynamic corrosion test designed to simulate industrial conditions Experiments were conducted as function of rotation speed contact time duration and temperature The results of dynamic corrosion tests are in excellent agreement
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Dynamic Testing of Gasifier Refractory
Cr2O3–Al2O3–ZrO2 and Cr2O3–MgO compositions could withstand gasifier environments long enough to be economically feasible 6 8 According to Bakker 9 10 a minimum 75 wt Cr2O3 is necessary in a refractory material for sustained material performance in slagging gasifiers
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Evolution of in Situ Refractories in the 20th Century
A common theme over the past 100 years in refractories science and technology has been to generate a protective refractories layer in a high‐temperature container often by reaction of the refractory materials with the contents glass slag or atmosphere
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Effect of ZrO2 Additive on the Properties of MgO Cr2O3
To improve the properties and RH degasser slag corrosion resistance of magnesia chrome refractory the effect of the addition of ZrO2 was investigated The results showed that the presence ZrO2 additive can densify the magnesia chrome samples due to promotion of grain boundary activities and ultimately direct bond formation which improved the high temperature mechanical properties and
Get PriceCorrosion Resistance of Refractories in Melts of Glasses
A study of the corrosion resistance of a wide range of refractory materials in borosilicate glass melts showed that the most glass resistant materials are fused cast chromium bearing refractories with a Cr2O3 content greater than 78 6 The same degree of corrosion resistance is exhibited by fused cast refractories that contain more than 90 ZrO2
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A new ternary phase in the system CaO–Al2O3–Cr2O3
Polycrystalline material of a novel phase in the system CaO–Al2O3–Cr2O3 has been obtained by solid state reactions Chemical analysis indicated the
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Properties And Application Of Chrome CorundumNews
Cr2O3 is a high quality component of refractories which can form high melting point compounds with a variety of oxides For example Cr2O3 and Al2O3 can form a continuous solid solution Cr2O3 and MgO FeO form mgcr spinel ferrochrome spinel with high melting point Cr2O3 and Cu2O form melting point
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Low Chrome/Chrome Free Refractories for Slagging Gasifiers
Gasifiers are containment vessels used to react carbon containing materials with oxygen and water producing syngas CO and H2 that is used in chemical and power production It is also a potential source of H2 in a future hydrogen economy Air cooled slagging gasifiers are one type of gasifier
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