Abstract
Formation of WB2–Al2O3 composites was investigated by the reduction-based SHS scheme using WO3, B2O3, Al, W, and B4C as primary reactants. The effect of extra boron addition on combustion wave kinetics and product composition was studied. Excess boron supplied from four different boron compounds, including elemental boron, B4C, B2O3, and BN was examined. The addition of extra elemental boron led to an increase in combustion wave velocity and temperature, while the other three boron compounds caused a decrease. WB and WB2 were formed with WB2 fraction of 40% from the sample without extra boron. For the samples with 30 atom% excess boron, the use of elemental boron and B4C as extra boron source contributed to high WB2 yield fractions of about 90% and 86.4%, respectively.
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