Evolution of elastic properties and microstructural changes versus temperature in bonding phases of alumina and alumina–magnesia refractory castables

Auvray, Jean-Michel; Gault, C.; Huger, Marc

doi:10.1016/j.jeurceramsoc.2007.01.016

Cited by 78 publications

(41 citation statements)

References 9 publications

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“…In order to evaluate the microsilica role in this sort of castables and understand which of the expansive phases -CA 2 , MgAl 2 O 4 or CA 6 [7,12,14,15] -reaction rate was the most affected by this component, the derivative of the expansion curves is shown in Fig. 3.…”

Section: Microsilica Effect On Al 2 O 3 -Mgo Castables Containing Coamentioning

confidence: 99%

Microsilica or MgO grain size: Which one mostly affects the in situ spinel refractory castable expansion?

Braulio

Brant²,

Bittencourt³

et al. 2009

Ceramics International

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Section: Microsilica Effect On Al 2 O 3 -Mgo Castables Containing Coamentioning

confidence: 99%

Microsilica or MgO grain size: Which one mostly affects the in situ spinel refractory castable expansion?

Braulio

Brant²,

Bittencourt³

et al. 2009

Ceramics International

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“…Very little amounts of C 3 A (Ca 3 Al 2 O 6 ) is observed when samples are heated above 1500 • C. The amount of the Ca-rich phase C 12 A 7 is found to decrease with time as it reacts with alumina to form CA 2 or CA whereas, the amount of CA 2 formed decreases comparatively slowly with time. HAC is used as binding materials for monolithic applications and a significant advancement in monolithic technology is the development of refractory concretes or castables [17][18][19]. Castables, a type of monolith, are complex refractory formulations, requiring high-quality precision-sized aggregates, modifying fillers, binders, and additives.…”

Section: Introductionmentioning

confidence: 99%

Mechanochemically synthesized high alumina cement and their implementation as low cement castables with some micro-fine additives

Kumar

Singh

Srivastava

et al. 2015

Journal of Asian Ceramic Societies

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a b s t r a c tHigh-energy ball milling viz. mechanochemical process is being utilized to mechanically activate ceramic powders for low temperature solid state reactions. The process can help to select low-cost commercially available oxides and can produce powders with nanometer size granules. On the other hand, high alumina cement provides high service temperature when used as refractory castable. Therefore, the effects of highenergy ball milling and subsequent calcinations on the formation of high alumina cementing phases using mixtures of Al 2 O 3 and CaCO 3 were investigated. Nano-meter sized high alumina cement (HAC) powders were synthesized by mechanochemical treatment of Al 2 O 3 and CaCO 3 in weight ratios 7:3 and 8:2. This paper compares the calcined high alumina cement obtained by mechanically activated precursor mix for 1, 2 and 3 h. Low cement castables were prepared from calcined Chinese bauxite as aggregate matrix, prepared HAC acting as hydraulic binder and micro-fine additives as pore filling agents. The bonding of high alumina cement as well as sinterability in these castable was studied with ZrO 2 , ␣-Al 2 O 3 and SiC as micro-fine additives. Castables formulated by prepared high alumina cement demonstrate remarkably improved bulk density and apparent porosity as when compared with those prepared by commercially available cement. Casting water demand was also reduced, as a result quick setting behavior was observed. The addition of mechanochemically processed cements in refractory castables improved the thermo-mechanical properties to a significant extent.

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“…Microstructure of the investigated samples (sintered at 1300 and 1600°C) are analyzed by comparing with the structures reported by [26,27]. It is obvious that concrete sample sintered at 1300°C has typical globular crystals morphology of CaOÁ2Al 2 O 3 (CA 2 ) as well as quite coherent microstructure.…”

Section: Methodsmentioning

confidence: 93%

Influence of sintering temperature on low level laser (LLL) destruction of low cement high alumina refractory concrete

Martinović

Vlahović

Stević

et al. 2015

Engineering Structures

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Evolution of elastic properties and microstructural changes versus temperature in bonding phases of alumina and alumina–magnesia refractory castables

Cited by 78 publications

References 9 publications

Microsilica or MgO grain size: Which one mostly affects the in situ spinel refractory castable expansion?

Microsilica or MgO grain size: Which one mostly affects the in situ spinel refractory castable expansion?

Mechanochemically synthesized high alumina cement and their implementation as low cement castables with some micro-fine additives

Influence of sintering temperature on low level laser (LLL) destruction of low cement high alumina refractory concrete

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