Maximum working temperature of refractory castables: do we really know how to evaluate it?

Luz, A.P.; Gomes, D.T.; Pandolfelli, V. C.

doi:10.1016/j.ceramint.2017.04.053

Cited by 17 publications

(4 citation statements)

References 3 publications

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“…The refractoriness under load (RUL) with temperature is plotted in Figure 5 for the different materials. It is the most used technique to characterize the maximum working temperature under compressive stress [18].…”

Section: Resultsmentioning

confidence: 99%

Manufacture of Industrial Refractory Crucibles Based on Clays from Burkina Faso

Barry,

Sawadogo,

Sawadogo

et al. 2024

JMMCE

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In Burkina Faso, one of the three largest gold producers in West Africa, foundry activity is often paralyzed when basic equipment such as crucibles and cups are not available or should be imported. However, previous studies have shown the availability of kaolinite-rich clay resources that could be used for the local manufacture of silico-aluminous ceramic crucibles. This work allowed to manufacture industrial ceramic crucibles with local clays and then they were tested in foundry industry. The materials were manufactured from three (03) raw materials including two clays (SAB and ROU) and sand. The chemical and mineral analysis has shown that the raw materials are suitable for the formulation of refractory materials. The results of characterization of the materials formulated showed that the properties of use are appreciable. The porosity of the materials is relatively low (23 -28 vol%) with a diametral compressive strength between 0.61 and 1.34 MPa. Crucibles sintered at 1250˚C with a stay of 2 hours have a mechanical strength capable of supporting the weight of the ores contained. These crucibles have a refractoriness under load (T 0.5 ) above 1141˚C and resist chemical attacks. Tests were carried out in the industry at 1100˚C, and the results were satisfactory.

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Section: Resultsmentioning

confidence: 99%

Manufacture of Industrial Refractory Crucibles Based on Clays from Burkina Faso

Barry,

Sawadogo,

Sawadogo

et al. 2024

JMMCE

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“…These reference temperatures are very useful for the comparison of the behavior with temperature of different refractories under load (RUL). It is the most used technique to characterize the maximum working temperature under compressive stress [14].…”

Section: Resultsmentioning

confidence: 99%

Formulation of Clay Refractory Bricks: Influence of the Nature of Chamotte and the Alumina Content in the Clay

Sawadogo¹,

Seynou²,

Zerbo³

et al. 2020

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Refractory materials from kaolinitic clays and clay chamotte or quartz were studied to increase the refractoriness under load at temperature above 1300°C. Two different clays mined in Burkina Faso were used and chamotte grains were obtained by preliminary firing a local clay. Fired materials at 1350-1400°C present a typical granular composite microstructure where large grains of chamotte or quartz are embedded in the clay matrix phase. Under load at high temperature, the behavior of material is influenced by the nature of the clay matrix phase that progressively melt at high temperature, the type of chamotte or quartz grains, the grain sizes of different phases and the sequence of the thermal transformations during firing. Kinetics of creep under a constant load were characterized against temperature and time. It gives the typical temperatures at fixed creep strains, that's a well-recognized method for the refractoriness quantification. It's shown that the kinetic of creep change with the variation of viscosity with temperature of the melted clay matrix phase, that's related to both the chemical composition and the extend of the micro-composite nature of the heat transformed clays. Results also indicated that values of activation energy for creep are correlated to the refractoriness of materials.

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“…Castables with heat treatment of alumina grog and zircon fines found that better physical and thermal properties, corrosion resistance, HMOR, and RUL. [33][34][35][36] Awang et al 37 fabricated a surface coating layer with different transition metallic materials, inorganic materials, lanthanide materials, and hybrids of these materials. The properties of coating materials include high temperature, high strength, extraordinary thermal fatigue, chemical resistance, low friction coefficient, and affordable cost.…”

Section: Introductionmentioning

confidence: 99%

“…Phase formation of confirmed mullite, zircon–mullite, andalusite, and anorthite in castables with addition of zircon fines, and mullite, zirconia, quartz, mullite, andalusite, and anorthite in castables with thermal treatment alumina grog. Castables with heat treatment of alumina grog and zircon fines found that better physical and thermal properties, corrosion resistance, HMOR, and RUL 33–36 …”

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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Maximum working temperature of refractory castables: do we really know how to evaluate it?

Cited by 17 publications

References 3 publications

Manufacture of Industrial Refractory Crucibles Based on Clays from Burkina Faso

Manufacture of Industrial Refractory Crucibles Based on Clays from Burkina Faso

Formulation of Clay Refractory Bricks: Influence of the Nature of Chamotte and the Alumina Content in the Clay

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

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