Effect of CaCO3 Micropowder on Properties of Corundum Based Porous Purging Plug

Abstract

Abstract: Porous purging plugs have been widely used due to the advantages of good air supply reliability, high safety and good refining effect. However, its application is limited by the defect such as low strength and short service life caused by its own porous structure. In order to further improve the properties of corundum based porous purging plugs, fused white corundum particles and fine powder, α-Al₂O₃ micropowder and Cr₂O₃ micropowder were used as raw materials, the mass ratio of aggregate to matrix was fixed at 85∶15, and 0%, 1%, 2% and 3% (mass fraction) CaCO₃ were used to replace fused white corundum fine powder, respectively. The effect of the introduction of CaCO₃ micropowder on the properties of porous purging plugs was explored. The results show that the strength at room temperature and high temperature all increase with the amount of CaCO₃ powder (from 0% to 2%). The main reason is that the CaO formed by the decomposition of CaCO₃ reacts with Al₂O₃ in the matrix to form calcium hexaaluminate, which intersperses and connects with each other to increase the bonding degree between the matrix, thus improving the strength of the samples.

Key words: porous purging plug, corundum based, fused white corundum, CaCO₃ micropowder, calcium hexaaluminate, permeability

CLC Number:

TQ175

QIU Xin, LI Fangyuan, ZHANG Shiming, LIU Xinhong, JIA Quanli. Effect of CaCO₃ Micropowder on Properties of Corundum Based Porous Purging Plug[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(10): 3279-3284.

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Effect of CaCO₃ Micropowder on Properties of Corundum Based Porous Purging Plug

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