Influence of an addition amount of a new type of alumina on the properties of ramming mullite-corundum mixes and samples from them

  • V. V. Primachenko JSC "URIR named after A. S. Berezhnoy", Kharkov, Ukraine
  • I. G. Shulik JSC "URIR named after A. S. Berezhnoy", Kharkov, Ukraine
  • I. V. Khonchik JSC "URIR named after A. S. Berezhnoy", Kharkov, Ukraine
  • T. G. Tishina JSC "URIR named after A. S. Berezhnoy", Kharkov, Ukraine
Keywords: ramming mullite-corundum mixes, spherical alumina, strength, thermal shock resistance, slag resistance.

Abstract

Effect investigation of an addition amount of spherical alumina on the properties of ramming mullite-corundum mixes of the MMK-90 (on a binder of an aqueous solution of orthophosphoric acid) and MMKPBF (with a MgO addition on a borophosphate binder) brands, as well as samples from them, have been carried out.

As a result of the carried out studies, it was found that the use of an optimal amount (4 %) of spherical alumina in the composition of ramming mullite-corundum mixes provides an increase in by 30 % in the cold crushing strength of samples made from them, fired at a temperature of 1580 °C, while maintaining at sufficiently high level indicators of their thermal shock resistance and slag resistance. The indicated alumina use in the composition of the MMK-90 mix during high-temperature firing of samples leads to an intensification of the mullite synthesis process. In fired samples from the MMKPBF mix, the spherical alumina forms a dense intergrowth of "felt-like" structure, which reinforces the structure, increasing the strength and thermal shock resistance of the samples.

Indicators of physical and chemical properties of ramming mullite-corundum mixes of improved composition and samples made from them (for MMK-90 and MMKPBF mixes, respectively): chemical composition, wt. %: Al2O3 — not less than 90.0 and 85.0; SiO2 — within 3.2-5.0 and no more than 2.5; Fe2O3 — no more than 1.0 and 0.6; P2O5 — in the range of 2.5-3.5 and 0.5-1.0; grain size composition, mm — 3-0; cold crushing strength after firing at a temperature of 1580 °С — 110 and 70 N/mm2; thermal shock resistance — > 20 thermal cycles 950 °С — water.

Ramming mullite-corundum mixes of improved composition are recommended for use in various heating units with high specific mechanical loads on the lining.

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Published
2020-12-30
How to Cite
Primachenko, V. V., Shulik, I. G., Khonchik, I. V., & Tishina , T. G. (2020). Influence of an addition amount of a new type of alumina on the properties of ramming mullite-corundum mixes and samples from them. Scientific Research on Refractories and Technical Ceramics, 120, 66-82. https://doi.org/10.35857/2663-3566.120.06

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