What is the Synthesis and Application of Zirconium Diboride

(What is the Synthesis and Application of Zirconium Diboride)

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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(What is the Synthesis and Application of Zirconium Diboride)