China's Refractories

《中国耐火材料》英文版

China's Refractories ›› 2023, Vol. 32 ›› Issue (1): 44-47.DOI: 10.19691/j.cnki.1004-4493.2023.01.009

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Influence of Firing Temperature on Properties of High Alumina Bricks

XIN Guiyan*, XIONG Naling, GUO Xiaowei, SHI Gaijun, LEI Qizhen   

  1. Sinosteel Luonai Materials Technology Corporation, Luoyang 471039, China
  • Online:2023-03-15 Published:2023-03-22
  • Contact: *e-mail: 89911541@qq.com
  • About author:Xin Guiyan obtained her master's degree of engineering from Xi'an University of Architecture and Technology in July 2013, majoring in materials science. Since then, she has been working in Sinosteel Luonai Materials Technology Corporation. She has been engaged in the production and research on alumina-silica refractories. She obtained a number of patents on the development of alumina-silica innovative products. The projects that she presided over, “Research and application of high-efficiency and longevity promotion type dense corundum mullite bricks” and “Development and application of runner bricks for special steel”, won the first prize of Henan Province Building Materials.

Abstract: To reduce production costs and make full and reasonable use of raw materials, high alumina bricks were prepared using tabular corundum and mullite as aggregates, sillimanite as intermediate particles, and white fused corundum powder, α-alumina micropowder, and Suzhou soil as the matrix, firing at different temperatures (1 420, 1 440, 1 460, 1 480, 1 500 and 1 520 ℃) for 4 h. The apparent porosity (AP), the bulk density (BD), the cold crushing strength (CCS), the thermal shock resistance (TSR), the refractoriness under load (RUL) and the creep rate of the samples were tested. The effects of the firing temperature on the creep rate (1 450 ℃×50 h, under a load of 0.2 MPa) of the samples were studied. The results show that with the sillimanite addition of 22.5 mass%, the sample fired at 1 460 ℃ for 4 h performs the best comprehensive properties: the AP of 17.5%, the BD of 2.75 g·cm-3, the CCS of 100.5 MPa, the TSR number of 35 cycles, the RUL of 1 682 ℃, and the creep rate of -0.428%, which can prolong the service life of furnaces.

Key words: sillimanite, creep rate, high alumina brick, firing temperature