What is Zirconium Diboride
Zirconium diboride is a hexagonal crystal form, and its metalloid structure determines that zirconium diboride has good conductivity and mobility, while the Zr-B ionic bond and B-B covalent bond between the boron atomic plane and the zirconium atomic plane The strong bond determines the high melting point, high hardness and high stability of this material. At the same time, it also has good flame retardancy, heat resistance, oxidation resistance, corrosion resistance and other characteristics. Its density is 6.085-6.17, its melting point is 3040℃, its Rockwell hardness is 88-91, and its compressive strength is 1555.3Gpa.
The manufacturing method of zirconium boride includes: reacting boron
trifluoride with zirconium, heating zirconium dioxide, boric acid and carbon in
a high temperature furnace to 1900 °C, heating elemental boron and zirconium
oxide to 1000-1000 °C under vacuum. 1750°C.
1. Preparation of high-purity zirconium diboride
Vapor-phase halides were deposited onto heated tungsten substrates in nitrogen.
2. Metal borides prepared by molten electrolysis
The composition of the electrolytic cell is CaO+CaF2+2B2O3+1/6 ZrO2, the temperature is 1 000 ℃, the purity of the product ZrB2 is 99.6%, the purest boride ZrB2 is obtained by the molten electrolysis method, and the impurity is graphite. The composition of the electrolytic cell and the ratio of a small amount of metal or boron, metal to boron in the boride can be controlled by the ratio of metal oxide to boron oxide in the electrolytic cell.
3. The method of industrial synthesis of zirconium boride is mainly the method of reducing boride with zirconia, and the reducing agent can be carbon or boron carbide (B4C). It is better to use boron carbide than carbon because the reduction of zirconium boride powder with carbon as the source of boron is boron anhydride, no matter whether it is synthesized by arc melting or solid phase reaction, because the boiling point of boron anhydride is very low, it will volatilize a lot when it is above 1 000 ℃. The chemical composition of the synthesized zirconium boride varies greatly, and the temperature of the melting method is high and the electrofusion rate is fast, which will cause serious contamination of the product by the Shimo crucible and may produce a large amount of by-product zirconium carbide. The single-phase product of zirconium diboride can be prepared by using boron carbide as reducing agent.
Metal compounds of boron such as boron (lithium) aluminum, titanium boride, boron nitride and boron carbide are used in the atomic energy industry, high-speed cutting in the aerospace industry, as well as in the telecommunications and electronics industries; elemental boron is also used in the manufacture of special alloys and automotive safety. airbag.
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