Synthesis of ultra‐fine TaB₂ nano powders by liquid phase method

Abstract

Ultra‐fine TaB2 powders were synthesized by a liquid phase method using tantalum ethoxide, boric acid and sucrose as the sources of tantalum, boron, and carbon. The TaB2 precursor powders is a Ta–B–C–O network system, which were heat‐treated at lower temperature (1500°C) in normal argon atmosphere to obtain the TaB2 powders. XRD confirms the presence of only hexagonal TaB2, while EDS and XPS spectrums confirm the composition and element chemical states of TaB2. The TEM images show a platelet shape of the TaB2 powder and the monocrystal SAED pattern confirms the presence of hexagonal TaB2. Particle size distribution curves show that particle size of the TaB2 powders distributes in the range of 30‐160 nm, whose mean particle size is 106 nm.

Low-Temperature, Efficient Synthesis of Highly Crystalline Urchin-like Tantalum Diboride Nanoflowers

“…For instance, Ren et al exploited low-melting-point Ta-B-C-O precursors to supply the boro/carbothermal reduction reaction for synthesizing TaB 2 with liquid medium. However, no formation of anisotropic TaB 2 was not reported despite the requirement of a high processing temperature of 1500 • C was still demanded, which was considered to be mainly due to the decomposition loss of the low-melting-point organic-based medium, before the temperature desirable for crystal growth of TaB 2 was attained [17]. As a result, inorganic salt with a relatively higher melting point was regarded as a promising medium for solid-state synthetic reaction of high-temperature materials, including TaB 2 .…”

Molten salt synthesis, formation mechanism, and oxidation behavior of nanocrystalline HfB2 powders

“…As members of ultra-high temperature ceramics, transition-metal borides (TMB 2 ) ceramics have attracted considerable attentions for potential applications in aircraft, atomic, and astronautic manufacturing industries, since they exhibit high melting point, high hardness, high thermal conductivity, and excellent chemical stability [1][2][3]. The synthesis of TMB 2 powders is critical for implementing their extensive applications.…”