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What Are The Zirconium Diboride Properties And Application Of Zirconium Boride?

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Update time : 2020-06-30 09:37:13

Zirconium boride is a chemical substance with the molecular formula ZrB2. Zirconium boride is a hard gray crystal. Zirconium boride has three components: zirconium mono-boride, zirconium diboride, and zirconium triboride. Only zirconium diboride is stable in a wide temperature range. Zirconium diboride is mainly used in industrial production.
 

Zirconium diboride properties:

Zirconium diboride is hexagonal crystal form, gray crystal or powder, relative density is 5.8, melting point is 3040℃. Zirconium boride has high-temperature resistance, high strength at room temperature, and high temperature; it has excellent thermal shock resistance, small resistance, and oxidation resistance at high temperatures.
 

Zirconium boride is metallic, and its electrical resistance is slightly lower than that of metallic zirconium. After heating, it is stable in a broad temperature range. Although the melting point of zirconium boride is high, it can be sintered at a lower temperature. Zirconium diboride is prepared by mixing metal zirconium with boron carbide and boron nitride and heating to 2000°C in an argon gas flow.
 

Zirconium boride is one of the primary and common materials in boride. ZrB2 has the characteristics of a high melting point, high stability, and excellent corrosion resistance. It is used as various high-temperature materials and functional materials, showing an excellent comprehensive high-temperature performance.

Application of zirconium boride in ZrB2-C refractories

It has been dramatically improved in terms of resistance to molten steel erosion and spalling, but there are still problems with a certain amount of alumina accumulation and strong erosion. ZrB2 has been developed using the advantages of ZrB2 material to resist molten steel erosion and good high-temperature performance. -C-ZrB2 quality nozzle protection ring, because ZrB2 is oxidized at a high temperature to generate a low-melting liquid phase B2O3, which reacts with coexisting Zr0 to increase the viscosity of the liquid phase and ensure the corrosion resistance of the material is conducive to improving the nozzle life.
 

Application of zirconium boride in Mg0-C refractories

Add ZrB2 to Mg0-C refractory material or directly use ZrB2 as an aggregate or fine powder to make refractory bricks and castables. At medium temperature, its antioxidant effect is better than that of A1, which is due to the generation of B2O3 The melting point is 450°C. The liquid phase begins to form at a relatively low temperature, condenses on the MgO particles, and gradually generates a reactant containing much MgO. When the temperature is above 700°C, the B2O3 produced condensate increases significantly. The resulting liquid phase acts as a protective layer, inhibits the diffusion of oxygen, and effectively acts as an antioxidant. At high temperatures, the advantages of adding A1 as an antioxidant appear. This is due to the fact that B2O3 needs to evaporate easily at high temperatures so that the anti-oxidation performance is weakened.
 

Application of zirconium boride in A1-C refractories

ZrB2 is added as an antioxidant to A1-C refractory materials, which can achieve a good effect between 700-12000 ℃. This is also due to the formation of a low-temperature liquid phase, the B2O3·A1 molten phase oxidized by ZrB2, which The anti-oxidation mechanism is about the same as Mg0-C refractory. In addition, the 9A1·B2O3 crystal phase with a melting point as high as 1965℃ occurs in the oxidized sample. This liquid phase generated at the beginning of condensation and low temperature can create high-temperature products with the progress of the reaction and bring higher Erosion resistance.
 

Therefore, whether the nozzle brick, refractory brick, or castable, if zirconium boride and metal are added at the same time, the performance of the product such as oxidation resistance, corrosion resistance, and thermal shock resistance will be significantly improved.

In addition to being used as a unique refractory material, ZrB2 zirconium diboride ceramic material can also be used in missiles and space shuttle aircraft, which can improve its high-temperature resistance and safety performance.
 

Because ZrB2 has a very low resistivity and the conduction mechanism is electronic conduction, it is suitable for contact materials and electrode materials. It can be applied to the electrodes of metal thermocouples and high-temperature heating elements.
 

Because of its extremely high hardness, zirconium boride is a good wear-resistant material and has good applications in cutting tools and cutting tools.
 

Zirconium diboride powder has an extremely high melting point, strength, hardness and conductivity (and positive conductivity coefficient), and low thermal expansion coefficient, besides, also has excellent chemical stability, trapping concentrator, smoldering, heat resistance, corrosion resistance, and the lightweight and other unique properties, so it is widely used.
 

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