Thermomechanical Considerations for Refractory Linings

Schacht, Charles A.

doi:10.1201/9780203026328.ch13

Cited by 9 publications

(11 citation statements)

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“…Корундовые микросферы также могут реагировать с углеродом [8] по реакциям (6) и (7). Образующийся карбид алюминия может реагировать с водородом [9] из воздуха, а также образующейся в процессе пиролиза фенолоформальдегидной смолой.…”

Section: результаты и их обсуждениеunclassified

High-temperature transformations in the fibrous-polymer composites at ablation testing

Trofmovich¹,

Yurkov²,

Галигузов³

et al. 2018

Nov. ogneup.

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The comparative investigation on the ablation transformations were carried out for the phenolformaldehyde resin composites on base of silica fabric and hollow corundum micro spheres. It was establish that the corundum micro spheres addition lead to the composite's heat conductivity reduction. As a result the temperature increased at the exposed spot, the linear erosion rate increased by the factor of 2,7 and the coking front line decreased by a factor of 2,3. In the issue the ablation gave rise to the high-temperature mechanical and chemical erosion and these last in turn triggered the number of the serial-parallel chemical reactions with both the composite material porosity increasing and the creation of the hightemperature reaction products mainly the silicon carbide.Ill.9. Ref. 9. Tab. 4.

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Section: результаты и их обсуждениеunclassified

High-temperature transformations in the fibrous-polymer composites at ablation testing

Trofmovich¹,

Yurkov²,

Галигузов³

et al. 2018

Nov. ogneup.

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“…(11). 26) ................ (11) Thus, it can be expected that for a given load level, the stress acting on a particle whose height is larger than the width (namely the particle with a higher aspect ratio, as in the direction <B>), will be larger than on a particle whose height is smaller than the width (as in the direction <A>). Consequently, more carbon particles will be broken down on the fracture surface in the direction <B> than in the direction <A>, further making it easier for the crack to propagate in the former case due to the practically decreased bridging stress.…”

Section: Further Consideration On the Effects Of Carbonmentioning

confidence: 99%

Effects of Carbon Content and Grain Orientation on the Crack Growth Behaviour in Magnesia-carbon Refractory Bricks

Hino

Zhang

2014

ISIJ Int.

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Effects of carbon content and loading direction/grain orientation on the crack growth resistance of MgO-C refractories were examined via evaluating R-curve, critical stress intensity factor and bridging stress derived from the results of three point bending testing on single edged notched beam samples. The results indicated that crack growth resistance, critical stress intensity factor and bridging stress all increased with increasing the carbon content in the refractories, and were greater in the loading direction horizontal to than perpendicular to the sample pressing direction. Nevertheless, the stress intensity factor at crack initiation was similar in all cases of samples containing different levels of carbon. Based on these, it can be concluded that an MgO-C refractory with a higher carbon content would have better resistance against crack propagation after initiation, but would not show obvious improvement in its resistance against crack initiation.

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“…Em aciarias semi-integradas, com aços acalmados ao silício, os refratários dolomíticos têm sido amplamente utilizados. Eles apresentam excelente compatibilidade com as escórias básicas, são resistentes ao choque térmico e apresentam elevada refratariedade [2]. A boa resistência às escórias dos refratários doloma-C deve-se à presença de CaO livre, não encontrado em outros materiais refratários de menor basicidade.…”

Section: Introductionunclassified

Influência Da Composição Da Escória De Panela Na Dissolução Do Coating (C2s)

Cruz¹,

Pelisser²,

Bielefeldt³

et al. 2014

ABM Proceedings

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ResumoNa produção de aços é essencial garantir maior durabilidade do material refratário em panelas siderúrgicas. A formação de um revestimento protetor ("coating") de silicato dicálcico (C 2 S) em tijolos dolomíticos em contato com escórias básicas é fundamental ao aumento da vida útil dos mesmos. As temperaturas solidus e liquidus do C 2 S alfa puro são de aproximadamente 1.464°C e 2.154°C. Assim sendo, é esperada uma alta fração de sólido nas temperaturas de refino do aço. No entanto, a presença de óxidos como Al 2 O 3 , FeO e a fluorita (CaF 2 ) na escória podem acelerar a dissolução do coating pela formação de fases de menor temperatura de fusão. A fim de melhor compreender esse processo, foram preparadas amostras de diferentes composições de fluorita + C 2 S na temperatura de 1.600°C. Os resultados foram analisados com o auxilio do software FactSage (simulação termodinâmica). Especificamente, foi estudada a influência da formação de fases e da temperatura de formação das mesmas, as quais levam a fusão do coating. Os dados de simulação foram validados através de ensaios em forno de laboratório. Abstract In steel making is vital to ensure durability of the refractory material in ladle. The formation of a protective coating of dicalcium silicate (C 2 S) in dolomite bricks in contact with basic slag is critical to increasing their useful life. The solidus and liquidus temperatures of the pure alpha C 2 S are approximately 1,464°C and 2,154°C. Thus, it is expected a high solid fraction at temperatures of steel refining. However, the presence of oxides such as Al 2 O 3 , FeO and fluorite (CaF 2 ) in the slag can accelerate the dissolution of the coating by the formation of phases of lower melting temperature. In order to better understand this process, samples were prepared with different compositions of fluorite + C 2 S at a temperature of 1,600°C. The results were analyzed with the help of software FactSage (thermodynamic simulation). Specifically, were studied the influence of the phases formation and the temperature of the phases, which leads to fusion of the coating. The simulation data were validated through testing in a laboratory furnace.

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Thermomechanical Considerations for Refractory Linings

Cited by 9 publications

References 0 publications

High-temperature transformations in the fibrous-polymer composites at ablation testing

High-temperature transformations in the fibrous-polymer composites at ablation testing

Effects of Carbon Content and Grain Orientation on the Crack Growth Behaviour in Magnesia-carbon Refractory Bricks

Influência Da Composição Da Escória De Panela Na Dissolução Do Coating (C2s)

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