What is Zirconium diboride?
A tetragonal ZrO2 phase (nominated as T-ZrO2) was detected
among the remaining materials in the sample that was milled for 13 min (the
ignition point). Zirconium dioxide transformed from its monoclinic crystal
structure at room temperature to a tetragonal form due to the significant
temperature rise resulting from the highly exothermic MSR reaction. Because the
cooling rate after ignition is very high, traces of transformed zirconia remain
in the tetragonal state at room temperature. A very slight amount of elemental
Zr was detected in the XRD pattern for the sample milled for 13 min, most
likely due to the incomplete reaction of reduced zirconium with boron.
Elemental boron, which may remain due to the incomplete reaction with
zirconium, could not be detected, most likely due to its very little quantity
and amorphization due to rapid cooling after ignition.
The mechanistic study of the
formation of ZrB2–Al2O3 composite
The mechanistic study of the formation of ZrB2–Al2O3
composite during milling in the present work can be divided into two sections.
The study of involved sub-reactions initially investigated the overall
reaction. In the second step, the effect of boron oxide amount on the nature of
the reaction was studied. To form zirconium diboride, zirconium and boron
elements must be obtained by reducing their corresponding oxides. The reaction
between these two elements can subsequently form ZrB2. According to the
adiabatic temperatures (Tad) and enthalpy values of the above reactions, Reas.
2 and 4 meet the required conditions to satisfy Merzhanov’s criterion to
proceed self-sustaining. However, the reduction of ZrO2 by Al does not satisfy
these conditions, and it is anticipated to proceed gradually as an ordinary
reaction.
ZrB2 can be synthesized
When Al, B2O3, and ZrO2 are all present in one system.
Consequently, ZrB2 can be synthesized by the reaction between these two
elements. The highly exothermic reaction of the reduced B and Zr can exert an
additional amount of heat on the system, thus causing the further ZrO2
reduction to proceed more easily. All these three reactions occur
simultaneously; thus, only one peak is observed in the pressure-time graph of
the overall reaction. This postulation can be confirmed by a trace amount of
residual zirconium as the XRD pattern just after the ignition time shows.
Although elemental boron was not detected in the XRD pattern, it may be present
due to the incomplete reaction of ZrB2 formation and the remaining elemental
zirconium. Boron can possibly be interpreted as being present in an amorphous
form if this possible mechanism is factual.
Price of Zirconium diboride
Zirconium diboride particle size and purity will affect the
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diboride is on our company’s official website.
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