Effect of Laser Sintering on Ti–ZrB2 Mixtures


  • B. Derby—contributing editor

  • This work was financially supported by the Ceramics and Nonmetallic Materials Program, Air Force Office of Scientific Research, under Grant No. FA9550-06-1-0163, NASA Langley Professor Program and NSF I/UCRC center grant. A portion of this research (XRD measurements) was conducted at the Center for Nanophase Materials Sciences, which is sponsored at Oak Ridge National Laboratory by the Division of Scientific User Facilities, U.S. Department of Energy.

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Multilayer structures of ZrB2 containing 30–70 wt% Ti were fabricated using a 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 mixtures had high relative densities (>92%) and hardness values (up to 11.4 GPa). The reactions enhanced dissolution of ZrB2 into Ti, governing the final compositions of the mixtures and facilitating the production of high-density boride solid solutions.