Effects of critical particle size on properties and microstructure of porous purging materials

Wang, Qingheng; Li, Yuanbing; Li, Shujing; Xiang, Ruofei; Xu, Nan; Ouyang, Si

doi:10.1016/j.matlet.2017.03.129

Cited by 19 publications

(8 citation statements)

References 16 publications

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“…Porous purging materials have been widely used in the fields of metallurgy, chemical industry, environmental protection, porous burner, etc Obviously, excellent gas permeability of the porous material is one of the basic premises for its functional applications. There are many methods to prepare porous materials, including particle packing , pore‐forming agent methods, sacrificial template methods, freeze‐drying processes, and gel casting . Porous materials of particle‐packing type facile manufacturing, excellent gas permeability, and high mechanical strength.…”

Section: Introductionmentioning

confidence: 99%

“…Here, ε is the efficient porosity of granular aggregates, K k is the Kozeny parameter, and S 0 is the specific surface. Next, Ergun established the following equations for k 1 and k 2 that originate from the Kozeny-Carman equation via a large number of experiments. 11 Here, k 2 is the non-Darcian permeability, and d p is the equivalent diameter of the particle.…”

Section: Introductionmentioning

confidence: 99%

“…The permeability of a porous medium can be derived from Darcy's law, Equation (1), and Forchheimer's equation, Equation (2):…”

mentioning

confidence: 99%

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Correlations between pore structure parameters and gas permeability of corundum porous materials

Xiong

Wang

et al. 2019

J Am Ceram Soc

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Corundum porous materials with different contents of calcium hexaluminate formed in situ were prepared using pure calcium aluminate cement as the calcium source. The surface fractal dimensions of the porous materials were calculated based on the experimental data of mercury intrusion. Correlations between pore structural parameters and the permeability coefficients k1 and k2 of the porous materials were then studied based on the grey system theory. The results showed that pores in the corundum porous materials have great fractal characteristics. The surface fractal dimension was a significant pore structural parameter that reflected the complexity of pore shape, pore surface, and pore‐size distribution, which had the maximum correlation coefficient with the permeability of this type of porous materials. The apparent porosity and pore‐size distribution had relatively high correlation coefficients to the permeability as well. Increasing the apparent porosity and the volume percentage of larger pores, and decreasing the volume percentage of smaller pores all benefited the permeability of the porous materials. In addition, the mean pore size and median pore size showed lower correlation coefficients to the permeability—especially for porous materials with a wide pore‐size distribution.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Correlations between pore structure parameters and gas permeability of corundum porous materials

Xiong

Wang

et al. 2019

J Am Ceram Soc

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“…The method of incorporation of pore-forming agents with ceramic powder results can yield a porous structure of closed or poorly interconnected pores. Considerable research work directed at interconnected pore formation has been performed in our group [11][12][13][14]. The formation of interconnected pores is affected not only by the aggregate size [11] and content, but also by the pore-forming agent size [12] and content.…”

Section: Introductionmentioning

confidence: 99%

“…Considerable research work directed at interconnected pore formation has been performed in our group [11][12][13][14]. The formation of interconnected pores is affected not only by the aggregate size [11] and content, but also by the pore-forming agent size [12] and content. Larger aggregates facilitated pore linkage, which is beneficial to the formation of interconnected pores [11].…”

Section: Introductionmentioning

confidence: 99%

Effects of Aggregate Content on the Interconnected Pore Formation and Properties of Porous Purging Plug Materials

Wang¹

2019

Ceramics - Silikaty

Self Cite

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The physical properties and microstructure of porous purging plug materials with different aggregate contents and prepared at different firing temperatures were investigated by means of X-ray diffraction, scanning electron microscopy, air permeability, pore size distribution, apparent porosity, bulk density, cold modulus of rupture (CMOR), cold elastic modulus (E) and cold crushing strength (CCS) tests. The results show that the aggregate content had a great effect on the interconnected pore formation and properties of porous purging plug materials. With decreasing aggregate content, the apparent porosity and air permeability increased due to the distance between aggregates increasing and Al(OH) 3 formation, and the pore size distributions changed from a monomodal distribution to a bimodal distribution. The higher temperature facilitated the formation of a denser structure and interconnected pores. In addition, the CCS and porosity were found to follow a simple exponential relationship. When the apparent porosity increased, the CCS decreased, and vice versa.

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Effect of Coarse Aggregate Content on Bubble Formation Behavior in Corundum Permeable Brick for Tundish

Qin

Cheng

et al. 2023

steel research int.

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The nonmetallic inclusions in steel, composed of oxides and sulfides, usually act as defects in the metallic matrix and can spoil their mechanical properties. [1] These inclusions have many origins throughout steelmaking and can be classified into two categories. The exogenous ones come from refractory fragments or entrapped slag, and the chemical reactions among steel constituents in the molten pool may produce endogenous inclusions. [2] Cutting down the content of inclusions and improving the purity of liquid steel can not only improve the quality of steel semiproducts but also effectively prevent nozzles from clogging caused by inclusions adhering to the inner wall of nozzle. [3] Argon injection technology, as its excellent effect on the removal of inclusions, has been widely applied in the secondary refining and the continuous casting processes, and some processes, such as gas stirred ladle and gas curtain tundish, have been developed. The mechanism of removing inclusions is that nonmetallic inclusions are not wetted with the liquid steel and can attach on the surface of bubbles after collision and then float up with bubbles to be removed by buoyancy. [4] The wake flow of bubbles and the upward flow of gas plume can also carry the inclusions. [5] The smaller the bubble, the larger the gas-solid contact area, and the higher the inclusions removal efficiency. Therefore, an appropriate bubbling element to get bubbles with an ideal size distribution is the key to removing inclusions from liquid steel.Bubbling elements used in metallurgical process can be divided into three categories: directional permeable bricks, slit permeable bricks, and porous permeable bricks. [6,7] However, the gas supply for directional permeable bricks is unstable, and the flow channels are easy to be clogged at the later stage of use. A slit-permeable brick has poor thermal stability and is easily infiltrated by liquid steel. Moreover, the bubbles formed from it with a relatively larger size are not conducive to the removal of small inclusions in liquid steel. Compared with the former two, the porous permeable brick has better gas permeability, the stable bubble formation ability, and the strong antiscouring performance due to the interconnected pores and complex pore structure inside it. Thus, the porous permeable bricks have a good potential application value and a superior market development prospect in the production of high-quality steel.Recently, the correlation between the interval pore structure of porous permeable bricks and gas permeability has captured much attention of researchers, which determines the metallurgical effects of argon injection technology. Studies of porous permeable bricks mainly focus on the influence of preparation methods, materials type and size, and chemical reactions on the properties of permeable bricks. Zhang et al. [8] utilized SiC whiskers to adjust the property of mullite-corundum gaspermeable refractories and found that the silicon powder content strongly affected the mechanical and gas-permeabilit...

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Effects of critical particle size on properties and microstructure of porous purging materials

Cited by 19 publications

References 16 publications

Correlations between pore structure parameters and gas permeability of corundum porous materials

Correlations between pore structure parameters and gas permeability of corundum porous materials

Effects of Aggregate Content on the Interconnected Pore Formation and Properties of Porous Purging Plug Materials

Effect of Coarse Aggregate Content on Bubble Formation Behavior in Corundum Permeable Brick for Tundish

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