Title

Synthesis, Densification, and Mechanical Properties of TaB₂

Abstract

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.

Department(s)

Materials Science and Engineering

Sponsor(s)

U.S. Army Space and Missile Defense Command

Keywords and Phrases

Hot Pressing; Mechanical Properties; Synthesis; Tantalum Diboride (TaB2)

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2008 Elsevier, All rights reserved.

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