Design of bauxite-based low-cement pumpable castables: a rheological approach

Xianxin, Zhou; Sankaranarayanane, K.; Rigaud, M.

doi:10.1016/s0272-8842(03)00060-9

Cited by 16 publications

(6 citation statements)

References 1 publication

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“…preparation and application procedures, which consequently led to significant improvements in the refractory products performances [1][2][3]. Regarding the contemporary practice, refractory concretes are employed in a variety of metallurgical furnaces, cyclic thermal loading structures, blast furnace linings, steel making ladles, electricity producing reactors, etc [4,5]. A number of factors influence the failure mechanism of a refractory concrete built in a construction: oxidation due to high temperature and air interaction, erosion due to the movement of molten fluids, microstructure differential expansion, and macroscopic thermo-mechanical stress induced by the thermal gradient [6].…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties and microstructure fractal analysis of refractory bauxite concrete

et al. 2015

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The surface topography analysis via fractals as a means of explanation of composite materials mechanical and microstructural characteristics has hardly been reported so far. This study proposes a method of fractal analysis and its application to refractory bauxite concrete surface tribological investigation. Fractal dimension, profilegrams and fast Fourier transform method are introduced and supported by the adequate software for analysing contours and surface roughness, depending on the observation scale and also numerically depending on horizontal lines intercepted by the investigated profile. Also, the Richardson method and Kaye modification are applied to distinguish textured and structured aspect of grain contour geometry. Microstructural investigation was carried out using a scanning electron microscope. Using the fractals of the grains contact surfaces, a reconstruction of microstructure configuration, as grains shapes or inter-granular contacts, has been performed. Obtained results indicated that fractal analyses of contact surfaces of different shapes were very important for the prognosis of the concrete behaviour. The novel approach to the investigation of refractory concrete properties was successfully conducted, as a result introducing fractal identification as a means of composite materials performances evaluation. [Projekat Ministarstva nauke Republike Srbije, br. ON 172057 i br. III 45008]

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Section: Introductionmentioning

confidence: 99%

Mechanical properties and microstructure fractal analysis of refractory bauxite concrete

et al. 2015

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“…The better performance of the castables resulted in the addition of alumina aggregates, fumed silica, calcium aluminate cement, and additives. [26][27][28] Ghasemi-kahrizsangia et al 29 synthesized bauxite-based LCC with the addition of nanoalumina particles to promote the formation of needle mullite, which led to good physical, thermal, and microstructural characteristics. [29][30] Zawrah et al 31 prepared ultralow-and low-cement castables containing 90% weight aggregates and fines as a combination of 2%, 4%, 6%, and 8% zircon and 8%, 6%, 4%, and 2% alumina cement, respectively; they reported the formation of an in situ mullite-zircon composite microstructure with good physical and thermal properties.…”

Section: Introductionmentioning

confidence: 99%

“…The HMOR and creep resistance were lower at 1500°C owing to the formation of a liquid phase. The better performance of the castables resulted in the addition of alumina aggregates, fumed silica, calcium aluminate cement, and additives 26–28 . Ghasemi‐kahrizsangia et al 29 .…”

Section: Introductionmentioning

confidence: 99%

Effect of zircon surface coating on alumina grog and its influences on the properties of low‐cement castables

Krishnan

Manikandan

Thenmuhil

2021

Int J Applied Ceramic Tech

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In this investigation, four types of low-cement castables (LCC) were prepared with sintered mullite, high alumina grog, unfired, and fired zircon coated on alumina grog. These castables were evaluated in terms of their physical, thermal, and thermomechanical properties. The castables prepared using sintered mullite showed good physical and thermal properties with higher TSR than castables with fired zircon coated on alumina grog due to higher mullite with lower anorthite phases. Fired zircon coated on alumina grog castables were superior with lower corrosion and higher TSR of castables to those of castables with unfired zircon coated on alumina grog and high alumina grog due to formation of zircon and zirconia phases and surface coated on alumina grog gave better corrosion resistance. Castables prepared using unfired zircon coated on alumina grog and high alumina grog showed poorer properties than the other castables due to formation of higher porosity of alumina grog.

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“…Further applications of nano‐powders in refractory castables were reported in the literature . Rapid diffusion paths and very high surface energy usually make them relatively reactive in the refractories, which frequently encounter the aggressive environments, particularly in the cement and steel industries . According to previous reports, some properties such as corrosion, hydration, thermal shock resistance, and strength of refractory castable are improved by addition nanoparticles such as ZrO 2 and TiO 2 .…”

Section: Introductionmentioning

confidence: 99%

Optimized microstructure with nano‐alumina and its effects on properties of corundum spinel castables

Zhu

Chen

et al. 2019

Int J Applied Ceramic Tech

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The mechanical properties, thermal shock resistance, and microstructure evolution of corundum spinel castables with different nano-alumina contents were investigated.The results show that the addition of nano-alumina has advantages on the microstructure evolution and properties of castables. An optimum nano-alumina amount is 2 wt%. When nano-alumina addition changes from 0 to 2 wt%, the cold modulus of rupture (CMOR) and cold compressive strength (CCS) improved by 69.7% and 78.1% after firing at 1100°C, respectively. The CMOR and CCS increased by 42.5% and 35.2% after firing at 1500°C, respectively. Meanwhile, the hot modulus of rupture (HMOR) was enhanced by 21.5% to 13.4 MPa. The retained Young's modulus values of castables were improved from 49.6% to 59.6% after eight thermal shock cycles. Furthermore, the HMOR and the retained Young's modulus values of castables slightly reduced when nano-alumina content up to 3 wt%. XRD, DSC, SEM, and EDS analyses revealed that the addition of nano-alumina leads to the formation of calcium dialuminate (CaO·2Al 2 O 3 ) at 1100°C and it is beneficial to the formation of more platelet hibonite (CaO·6Al 2 O 3 ) at 1500°C. As a result of using nano-alumina with large surface area, the solid phase sintering of the nanoscale particles can occur at lower temperatures. Moreover, the mechanical properties and thermal shock resistance of the castables were improved remarkably. K E Y W O R D SMatrix microstructure optimization, Nano-alumina, orundum spinel refractory castables, Thermal shock resistance

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Design of bauxite-based low-cement pumpable castables: a rheological approach

Cited by 16 publications

References 1 publication

Mechanical properties and microstructure fractal analysis of refractory bauxite concrete

Mechanical properties and microstructure fractal analysis of refractory bauxite concrete

Effect of zircon surface coating on alumina grog and its influences on the properties of low‐cement castables

Optimized microstructure with nano‐alumina and its effects on properties of corundum spinel castables

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