Effect of spinel content on the properties of magnesia–spinel composite refractory

Ghosh, Arup; Sarkar, Ritwik; Mukherjee, B; Das, Susmita

doi:10.1016/s0955-2219(03)00353-4

Cited by 81 publications

(32 citation statements)

References 5 publications

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“…The addition of colloidal alumina has positive effect on the densification as revealed by the results in Table IV. This finding is in agreement with the observation by Ghosh et al [9,22,23] This can be attributed to the formation of in situ spinel phase. Small spinel grains as the second phase fill up the inter-granular gaps (or open pores) between magnesia grains, playing a role of an excellent ceramic bonding.…”

Section: A Slag Penetrationsupporting

confidence: 93%

Improvement of Resistance of MgO-Based Refractory to Slag Penetration by In Situ Spinel Formation

Wang

Glaser

Sichen

2015

Metall Mater Trans B

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MgO-in situ spinel substrate was prepared at 1773 K (1500°C) using colloidal alumina suspension and coarse MgO as raw materials. While the addition of 10 mass pct colloidal alumina had limited effect, addition of 20 mass pct colloidal alumina into the MgO matrix improved greatly the resistance of the substrate against the slag penetration at 1873 K (1600°C). The improvement was found to be mainly related to the formation of solid phases, CaOAEAl 2 O 3 and CaOAEMgOAEAl 2 O 3 at the grain boundaries due to slag-spinel reaction. Putting the reacted substrate into contact again with new slag revealed no appreciable new slag penetration. The results showed a potential solution to improve the resistance of MgO-based refractory to slag penetration and to improve steel cleanness.

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Section: A Slag Penetrationsupporting

confidence: 93%

Improvement of Resistance of MgO-Based Refractory to Slag Penetration by In Situ Spinel Formation

Wang

Glaser

Sichen

2015

Metall Mater Trans B

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“…MgAl 2 O 4 phase illustrates that an interface reaction occurred in the interface of Al and Al 2 O 3 nanoparticles due to existence of Mg element. MgAl 2 O 4 phase has some advantages such as low density, high melting point, good wear resistance, good heat stability, and high mechanical properties [43,44]. Furthermore, relatively good wetting was obtained at the interface Al, MgAl 2 O 4 , and Al 2 O 3 [45] .…”

Section: Microstructure Characterization Of the Rheoformed Composite mentioning

confidence: 99%

Microstructure, Mechanical Properties and Wear Behavior of the Rheoformed 2024 Aluminum Matrix Composite Component Reinforced by Al2O3 Nanoparticles

Jiang

Xiao

Che

et al. 2018

Metals

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Abstract:The 2024 nanocomposite reinforced with Al 2 O 3 nanoparticles was fabricated by the ultrasonic assisted semisolid stirring (UASS) method and rheoformed into a cylinder component. Microstructure, mechanical properties, and wear behavior of the rheoformed composite components were investigated. The results showed that the composite components with complete filling status and a good surface were rheoformed successfully. The deformation of semisolid slurries was mainly dominated by flow of liquid incorporating solid grains (FLS), sliding between solid grains (SSG), and plastic deformation of solid grains (PDS). Mechanical properties of the rheoformed composite components were influenced by stirring temperature, stirring time, and volume fraction of Al 2 O 3 nanoparticles. The optimal ultimate tensile strength (UTS) of 358 MPa and YS of 245 MPa were obtained at the bottom of the rheoformed composite components after a 25-min stirring of composite semisolid slurry with 5% Al 2 O 3 nanoparticles at 620 • C. Enhancement of mechanical properties was attributed to high density dislocations and dislocation tangles and uniform dispersed Al 2 O 3 nanoparticles in the aluminum matrix. Natural ageing led to the occurrence of needle-like Al 2 CuMg phase and short-rod-like Al 2 Cu phase. UTS of 417 MPa and YS of 328 MPa of the rheoformed composite components were achieved after T6 heat treatment. Improvement of mechanical properties is due to the more precipitated needle-like Al 2 CuMg phase and short-rod-like Al 2 Cu phase. Wear resistance of the rheoformed composite components was higher than that of the rheoformed matrix component. Wear resistance of the rheoformed composite component increased with an increase in Al 2 O 3 nanoparticles from 1% to 7%. A slight decrease in wear rate resulted from 10% Al 2 O 3 nanoparticles due to greater agglomeration of Al 2 O 3 nanoparticles. A combination mechanism of adhesion and delamination was determined according to worn surface morphology.

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“…According to Ghosh et al (2004), among the studied concentrations of 10, 20 and 30wt.% of spinel added to the magnesia-spinel refractory matrix, there is a content of 20% optimized properties, such as refractoriness under load, thermal shock resistance and hot modulus of rupture.…”

Section: Introductionmentioning

confidence: 99%

“…Literature is extensive with respect to the study of the properties of magnesiaspinel refractory (Szczerba et al, 2007;Ghosh et al, 2004;Grasset-Bourdel et al, 2012;Grasset-Bourdel et al, 2013;Aksel et al, 2002;Aksel et al, 2004a;Aksel et al, 2004b;Sarkar et al, 2003;and Aksel et al, 2004c), specially the thermal shock resistance. Due to the difference between the thermal expansion coefficient of periclase (13-15 x 10 -6 °C -1 ) and spinel (8-9 x 10 -6 °C -1…”

Section: Introductionmentioning

confidence: 99%

Influence of magnesia in the infiltration of magnesia-spinel refractory bricks by different clinkers

Gonçalves¹,

Pacheco²,

Brito³

et al. 2015

Rem: Rev. Esc. Minas

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In cement production, which involves the production of cement clinker in rotary kilns, the main refractories used are magnesia-spinel bricks. These bricks may suffer infiltration by the clinker liquid phase, resulting in the corrosion of the spinel and the formation of low refractoriness mineralogical phases, such as the Q phase (C 20 A 13 M 3 S 3 ), which compromises refractory performance. Thus, the aim of this work is to correlate the infiltration resistance of magnesia-spinel bricks made from different grades of magnesia by clinker collected in three different cement plants (A, B and C). The purity of magnesia, besides its physical properties, strongly influences the properties and the infiltration resistance of magnesia-spinel bricks; as such the use of high grade magnesia is essential for producing high performance refractories.

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Effect of spinel content on the properties of magnesia–spinel composite refractory

Cited by 81 publications

References 5 publications

Improvement of Resistance of MgO-Based Refractory to Slag Penetration by In Situ Spinel Formation

Improvement of Resistance of MgO-Based Refractory to Slag Penetration by In Situ Spinel Formation

Microstructure, Mechanical Properties and Wear Behavior of the Rheoformed 2024 Aluminum Matrix Composite Component Reinforced by Al2O3 Nanoparticles

Influence of magnesia in the infiltration of magnesia-spinel refractory bricks by different clinkers

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