Abstract
Multi-layer structures of ZrB2 containing 30-70 weight percent (wt%) Ti was fabricated using laser sintering/melting technique. Ti acted as the binding interface for the hard ZrB2 particles. Structural properties and oxidation behavior of laser sintered samples were studied using high temperature X-ray diffraction (HTXRD). HTXRD revealed the formation of boride solid solutions (Zr0.61Ti0.39B2, Zr0.2Ti0.8B2), Zr0.3Ti0.7 and TiB whiskers as well as several oxide species (Ti2ZrO and ZrOx) during laser sintering process. Laser sintered Ti-ZrB2 cermets had high relative densities (> 92%) and hardness values (up to 11.4 GPa). The chemical reaction-enhanced dissolution of ZrB2 into Ti governed the final compositions of the cermets, which provides an opportunity to produce high-density boride solid solutions.
