corrosion of high alumina and near stoichiometric spinels
Corrosion Behavior of High Nickel Alloys in Molten Nitrate
based high-chromium alloys generally outperform ferritic alloys but the alloys reported to be most resistant to corrosion in nitrate salt are those that contain aluminum in addition to chromium or those coated with aluminum.20 22 31 37 Two out of the five materials tested herein contain greater than 1wt aluminum but it is unknown at this time
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(near theoretical) at 1500–1600°C temperature range. The chemical compositions of all the batches containing alumina and spinel were calculated (table 4) based on chemistry of calcined alumina and spinel (table 1). The chemistry of spinel–alumina composites (A1 to A8) re-veals that each composite is a combination of spinel and
Get PriceCorrosion of MgAl2O4 Spinel with Different Al2O3 Contents
9 H. Sarpoolaky S. Zhang and W.E. Lee Corrosion of high alumina and near stoichiometric spinels in iron-containing silicate slags. J. Eur. Ceram. Soc.
Get Price(PDF) The corrosion and microstructure relationship for
Corrosion of a tabular alumina aggregate in the alumina-spinel castable (0 wt IS) highlighting the molten slag infiltration through the cracks generated as a result of excessive CA 6 formation.
Get PriceCorrosion Behavior of Al2O3 Ceramics in the Acid and
The corrosion rate and changes in the microstructure and fracture strength of alumina ceramics (93.0 Al2O3 and 99.5 Al2O3) were studied in 0.1m to 25m NaOH solutions at 150°C to 200°C where m
Get PriceCorrosion of High Alumina and Near Stoichiometric Spinels
Abstract Dissolution of alumina-rich spinel aggregates in iron-containing silicate slag was studied using grain corrosion tests. High alumina spinels (AR90 90 Al2O3) dissolve indirectly while
Get PriceSpinel In situ versus PreformedClearing the Myth
High corrosion and penetration resistance † various aggressive slag compositions † vacuum degassing Spinel In situ versus PreformedClearing the Myth M. Schnabel A. Buhr R. Exenberger C. Rampitsch The paper discusses the differ-ence in the formulation concepts of alumina-spinel (spinel contain-ing) and alumina-magnesia
Get PricePREMIUM ALUMINA FOR REFRACTORY APPLICATIONS
When compated to stoichiometric spinel the alumina-rich spinels have additional vacant lattice sites with the capability to absorb low- melting low-viscosity components of the attack- ing slag such as
Get PriceStudy of Spinel-Containing High Alumina Castable with
High alumina castable with presynthesized and in situ spinel formation is studied using two different lime-containing high alumina cements. Vibratable castable compositions were studied by conventional processing using a distribution coefficient of 0.29 and heat treatments at 110 900 and 1500°C.
Get PriceCorrosion of MgAl2O4 Spinel with Different Al2O3 Contents
9 H. Sarpoolaky S. Zhang and W.E. Lee Corrosion of high alumina and near stoichiometric spinels in iron-containing silicate slags. J. Eur. Ceram. Soc.
Get Price17.6 CorrosionChemistry
Corrosion is the degradation of a metal caused by an electrochemical process. Large sums of money are spent each year repairing the effects of or preventing corrosion. Some metals such as aluminum and copper produce a protective layer when they corrode in air.
Get PriceCorrosion of spinel clinker by CaO–Al2O3–SiO2 ladle slag
Dissolution of alumina-rich spinel aggregates in iron-containing silicate slag was studied using grain corrosion tests. High alumina spinels (AR90 90 Al2O3) dissolve indirectly while dissolution
Get PriceOlivine and Chromian Spinel in Primitive and Near
Low-volume mafic lavas of the Garibaldi volcanic belt exhibit a systematic along-strike change from high-alumina olivine tholeiite LILE- and LREE-enriched HFSE-depleted calc-alkaline basalts and magnesian andesites in northwestern Washington through transitional basalts to alkali-olivine basalts and trachybasalts in southwestern British Columbia. Northward variation in basalt type
Get PriceCorrosion of spinel clinker by CaO–Al2O3–SiO2 ladle slag
Dissolution of alumina-rich spinel aggregates in iron-containing silicate slag was studied using grain corrosion tests. High alumina spinels (AR90 90 Al2O3) dissolve indirectly while dissolution
Get PriceSpinel In situ versus PreformedClearing the Myth
High corrosion and penetration resistance † various aggressive slag compositions † vacuum degassing Spinel In situ versus PreformedClearing the Myth M. Schnabel A. Buhr R. Exenberger C. Rampitsch The paper discusses the differ-ence in the formulation concepts of alumina-spinel (spinel contain-ing) and alumina-magnesia
Get Price(PDF) The corrosion and microstructure relationship for
Corrosion of a tabular alumina aggregate in the alumina-spinel castable (0 wt IS) highlighting the molten slag infiltration through the cracks generated as a result of excessive CA 6 formation.
Get PriceReaction behavior of slag and spinel in steel ladle castables
found that the alumina-rich spinel changed into stoichiometric one at the interface between spinel and slag and that an iron- alumina spinelformed following to dissolution of the excessive alumina into slag. The increase inalumina content seemed to
Get PriceFormulation of Corrosion Inhibitors IntechOpen
Mar 28 2019 · Corrosion inhibitors are widely used in the production process due to their significant effect. In this chapter the formulation of typical corrosion inhibitors in acid solution near-neutral solution alkaline solution and oil and gas systems will be discussed respectively. Firstly the importance of pickling corrosion inhibitors for thermal equipment in industrial production in different
Get PriceCorrosion of high alumina and near stoichiometric spinels
Feb 01 2003 · Dissolution of alumina-rich spinel aggregates in iron-containing silicate slag was studied using grain corrosion tests. High alumina spinels (AR90 90 Al 2 O 3) dissolve indirectly while dissolution of near stoichiometric (AR78 78 Al 2 O 3) spinel is entirely direct.
Get PriceCorrosion Behavior of Al2O3 Ceramics in the Acid and
6 H. Sarpoolaky S. Zhang W. E. Lee Corrosion of high alumina and near stoichiometric spinels in iron-containing silicate slags. J. Euro. Ceram. Soc. 23
Get PriceReaction of Aluminum with Water to Produce Hydrogen
Even assuming high volume production the DOE target range for hydrogen cost of 2-3 per kg H2 would not be met. Additionally the supply of aluminum required for mass market vehicle applications may be problematic. While aluminum-water reaction systems cannot meet the
Get Price(PDF) Corrosion of High Alumina Spinel Castables by Steel
Dissolution of alumina-rich spinel aggregates in iron-containing silicate slag was studied using grain corrosion tests. High alumina spinels (AR90 90 Al2O3) dissolve indirectly while dissolution
Get Price(PDF) The corrosion and microstructure relationship for
Corrosion of a tabular alumina aggregate in the alumina-spinel castable (0 wt IS) highlighting the molten slag infiltration through the cracks generated as a result of excessive CA 6 formation.
Get PricePREMIUM ALUMINA FOR REFRACTORY APPLICATIONS
High-alumina aggregates Almatis offers multiple aggregates in a wide spinels in refractory products designed for high corrosion resistance. Furthermore the thermal-shock resistance of Alumina-rich spinels AR 78 and AR 90 are distinguished by their chemistries (78 and 90 alumina respectively).
Get PriceDistinguishing Heated from Unheated Natural Spinels
Distinguishing Heated Spinels from Unheated Natural Spinels and from Synthetic Spinels line near 685 nm as well as vibronic sidebands of that line and other lines associated with Cr3 fraction of aluminum on cation sites is accommodated by magnesium and oxygen
Get PriceNovel calcium hexaluminate/ spinel-alumina composites with
slightly different from the value (0.286 nm) in the stoichiometric MA. These are understandable as the structure and the energetics ofthe spinels permit themto tolerate awide range ofcation compo-sitions37–39. At high temperature MA can form a wide range of solid solutions with excessive magnesia or alumina i.e. MgO nAl 2O 3 n
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