High purity corundum bricks
Key words:
Zirconia mullite bricks are generally produced by the electrofusion method, but also by the sintering method. Sintered zirconia mullite bricks are special refractory materials made of industrial alumina and zirconia concentrate as raw materials, and zirconia is introduced into the mullite matrix through reaction sintering process. The introduction of zirconium oxide into mullite bricks can greatly improve the high-temperature mechanical properties of mullite materials by utilizing the phase transition toughening of zirconium oxide. Zirconia has a promotional effect on the sintering of mullite materials, and the addition of ZrO2 can accelerate the densification and sintering process of ZTM materials due to the generation of low melting point and the formation of vacancies. When the mass fraction of ZrO2 was 30%, the relative theoretical density of the billet sintered at 1530°C reached 98%, the strength reached 378 MPa, and the toughness reached 4.3 MPa-m1/2.
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