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Application of Zirconium Boride Refractory Raw Materials in Refractory Products

wallpapers Industry 2020-07-21

Zircon Boron is a relatively common and stock material in boron. Among them, ZrB2 has a high melting point, high stability, and excellent corrosion resistance. It is used as a variety of high-temperature materials and functional materials and exhibits an excellent comprehensive high-temperature performance.

Application in ZrB2-C refractorie

It was dramatically improved in terms of resistance to molten steel corrosion and spalling, but there is still a certain amount of alumina accumulation, strong corrosion, and other problems. ZrB2 has been developed using the advantage of the ZrB2 material's corrosion resistance to molten steel and excellent high-temperature performance. C-ZrB2 quality nozzle protection ring, because ZrB2 is oxidized at high temperature to generate low melting point liquid B2O3, which reacts with coexisting ZrO to increase the viscosity of liquid phase and ensure the corrosion resistance of the material, which is beneficial to improve the nozzle life.

Application in Mg0-C refractories

Add ZrB2 to Mg0-C refractory materials or directly use ZrB2 as an aggregate or fine powder to make refractory bricks and castables. At medium temperature, its anti-oxidation effect is better than that of A1. This is because B2O3 is generated. The melting point is 450°C, and the liquid phase begins to form at a relatively low temperature, condensing on the MgO particles, and gradually forming reactants containing more MgO. When the temperature is up to 700°C, the amount of fused matter produced by B2O3 increase significantly. The resulting liquid phase acts as the protective layer, inhibits the diffusion of oxygen, and effectively acts as an antioxidant; however, at high temperatures, adding A1 as an antioxidant appears. This is because B2O3 is easy to evaporate at high temperatures, which weakens the oxidation resistance.

Application in A1-C refractories

ZrB2 is added as an antioxidant to A1-C refractory materials. It can achieve excellent results at 700-12000°C. This is also due to the formation of the low-temperature liquid phase, the B2O3·A1 molten phase oxidized by ZrB2. The oxidation resistance mechanism is roughly the same as that of Mg0-C refractories. Besides, the 9A1·B2O3 crystal phase with a melting point of 1965°C occurs in the oxidized sample. This liquid phase formed at a low temperature at the beginning of condensation can generate high-temperature products with the reaction's progress. The erosion resistance.

Therefore, whether it is nozzle bricks or refractory bricks, castables, if ZrB2 and metal are added simultaneously, the properties of the product such as oxidation resistance, corrosion resistance, and thermal shock resistance will be significantly improved.

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