Influence of porosity and structure of corundum refractories on their thermal conductivity

Duderov, I. G.; Poluboyarinov, D. N.

doi:10.1007/bf01290694

Cited by 5 publications

(4 citation statements)

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“…2a between our results (curve 4) for the foam corundum refractories having apparent density 0.90 g/cm 3 and published values [6], as well as with measurements by the stationary plate method made by ourselves and at the Ukrainian Refractories Research Instituter. 2a between our results (curve 4) for the foam corundum refractories having apparent density 0.90 g/cm 3 and published values [6], as well as with measurements by the stationary plate method made by ourselves and at the Ukrainian Refractories Research Instituter.…”

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confidence: 88%

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Thermophysical parameters of high-performance corundum insulation at 500?2100 K

Bondarenko

Litovskii

1988

Refractories

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confidence: 88%

“…The attenuation coefficient is [I, i0] defined by 1-~Io exp (--k a L~ (6) We equate the right sides in (5) and (6) To determine N, we first calculate the number of spheres in the rectangular parallelepiped having height L (Fig. 3a), whose base is a square with side i.…”

Section: T----mi--r/x Exp (--A~t) Exp (--A~t--t9 ( 5 )mentioning

confidence: 99%

Thermophysical parameters of high-performance corundum insulation at 500?2100 K

Bondarenko

Litovskii

1988

Refractories

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“…They found that the thermal conductivity of materials with porosities ≥45% is almost constant with temperature and about 75% lower than that of the dense mullite. In addition, the thermal conductivity is also related with the size and distribution of the pores 8) .…”

Section: Introductionmentioning

confidence: 99%

Influence of Structure on Thermal Conductivity of Insulation Board Used during Ingot Casting

et al. 2017

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In order to improve heat prevention property of insulation board used in hot top during casting of steel ingot, thermal conductivities of insulation boards of solid structure and porous structure with different porosities were investigated using numerical simulation and calorimetric techniques. A heat transfer model used to calculate the thermal conductivity of insulation boards was developed, and the accuracy of the model was veri ed by calorimetric experiment. A series of porous insulation boards made of oating beads with different porosities were designed and effect of porosity on thermal conductivity of porous insulation board was investigated by numerical simulation. It was found that porous insulation board performs a better heat prevention property than insulation board of solid structure. Thermal conductivity of porous insulation board decreases notably with the increase of porosity. By contrast, the sizes of pores almost have no in uence on the thermal conductivity of porous insulation board.

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“…They are mostly influenced by temperature, chemical composition and microstructure [1][2][3], and the relationship between them and pore structure (which describes the microstructure of refractory materials) is studied frequently at present. Large apparent porosity leads to the thermal conductivity decreasing markedly [4], while pore configuration and pore size distribution are also the important factors influencing thermal conductivity [5,6]. However, due to diversification of pore configuration and large range of pore size distribution, the quantitative relationship between them and thermal conductivity is difficult to determine.…”

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Influence of pore structure parameters on thermal properties of corundum based castables

Zhu

Fang

Gao³

et al. 2011

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. A series of corundum based castables bonded by ρ-Al 2 O 3 were prepared and fired at different temperature. Influences of apparent porosity and pore size distribution on thermal properties of the samples at different temperature were studied. The relationship between different pore size intervals and thermal conductivity of the samples was also discussed based on grey relational theory. The results show that thermal properties including thermal conductivity, thermal diffusivity and specific heat decline as apparent porosity of the samples increases. When apparent porosity of the samples keeps stable with little fluctuation, thermal conductivity increases as median pore size of the samples increases. It is found that thermal conductivity of the samples at a certain temperature presents the largest grey relational degree with the pore size interval that takes up the dominant volume ratio. IntroductionThermal conductivity, thermal diffusivity and specific heat are the three most important thermal properties for refractory materials. They are mostly influenced by temperature, chemical composition and microstructure [1][2][3], and the relationship between them and pore structure (which describes the microstructure of refractory materials) is studied frequently at present. Large apparent porosity leads to the thermal conductivity decreasing markedly [4], while pore configuration and pore size distribution are also the important factors influencing thermal conductivity [5,6]. However, due to diversification of pore configuration and large range of pore size distribution, the quantitative relationship between them and thermal conductivity is difficult to determine.In this work, a series of corundum based castables with ρ-Al 2 O 3 as the binder (only corundum phase existed after high temperature treatment, thus, the influence of chemical composition on thermal properties could be ignored) were prepared to study the influences of pore structure parameters on thermal properties. Considering the achievement of grey relational theory on describing the uncertainty relationship of two objects [7,8], it was adopted to investigated the relationship between pore size distribution and thermal conductivity.

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Influence of porosity and structure of corundum refractories on their thermal conductivity

Cited by 5 publications

References 0 publications

Thermophysical parameters of high-performance corundum insulation at 500?2100 K

Thermophysical parameters of high-performance corundum insulation at 500?2100 K

Influence of Structure on Thermal Conductivity of Insulation Board Used during Ingot Casting

Influence of pore structure parameters on thermal properties of corundum based castables

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