Synthesis, Densification, and Mechanical Properties of TaB₂
Tantalum diboride (TaB2) was synthesized by reducing Ta2O5 using B4C and graphite at 1600 °C under flowing Ar. The powder had an average particle size of 0.4 μm with both needle-like and rounded particles. The TaB2 powder was hot pressed to relative densities of 97% at 2000 °C (3.6 μm grain size) and 98% at 2100 °C (5.3 μm grain size). Mechanical properties were measured for TaB2 hot pressed at 2100 °C and were comparable to those of the commonly studied diborides, ZrB2 and HfB2. The Young's modulus was 551 GPa, Vickers' hardness was 25.6 GPa, flexure strength was 555 MPa, and fracture toughness was 4.5 MPa-m1/2.
X. Zhang et al., "Synthesis, Densification, and Mechanical Properties of TaB₂," Materials Letters, Elsevier, Jun 2008.
The definitive version is available at http://dx.doi.org/10.1016/j.matlet.2008.06.052
Materials Science and Engineering
U.S. Army Space and Missile Defense Command
Keywords and Phrases
Hot Pressing; Mechanical Properties; Synthesis; Tantalum Diboride (TaB2)
Article - Journal
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