Synthesis of ZrB2 powders by carbothermal and borothermal reduction

Highly Efficient and Low-Temperature Preparation of Plate-Like ZrB2-SiC Powders by a Molten-Salt and Microwave-Modified Boro/Carbothermal Reduction Method

“…For the sample (MB-1) prepared at 1100 °C, all the visible diffraction peaks belonged to ZrSiO 4 , implying the decomposition of zircon (Reaction (1)) had not yet occurred. Upon increasing the temperature to 1150 °C (MB-2), some peaks indexing to the ZrB 2 phase appeared, indicating that the onset temperature of synthesizing ZrB 2 was close to 1150 °C, which was dramatically lower than that of the conventional method [27,28]. Besides, neither SiO 2 nor ZrO 2 was detected in this sample, suggesting that Reaction (2) and Reaction (3) were so efficient that intermediate products (ZrO 2 and SiO 2 ) were not detected.…”

“…It should be emphasized that the preparation conditions (1200 °C/20 min) for phase pure ZrB 2 -SiC powders was almost the lowest according to Table 2, among that reported for synthesizing ZrB 2 or ZrB 2 -SiC by the methodologies based on thermal-reduction process [5,14,15,27,28,29,30,31,32,33,34,35,36,37,38], not only remarkably milder than that (several hours or more) required for conventional BCTR to prepare phase pure ZrB 2 or ZrB 2 -SiC powders, but also that even with costly active metals (e.g., Mg and Al) [30,39] or boron [29,31,35] as the additional reducing agent. Such great enhancement to the synthetic result of ZrB 2 -SiC powders should be attributed to the combined effects of microwave heating and molten-salt medium.…”

Microstructures, solid solution formation and high-temperature mechanical properties of ZrB2 ceramics doped with 5vol.% WC

“…During the past years, there have been lots of progress and developments in the researches on the synthesis of high purity and ultrafine powders [2][3][4], densification process of sintering [5][6][7][8], microstructure tailoring [9,10], characterization of conventional mechanical properties [11,12] and mechanism of oxidation resistance [13].…”

Carbothermal reduction synthesis of ZrB2 nanofibers via pre-oxidized electrospun zirconium n-propoxide

“…The unique combination of these properties makes ZrB 2 a promising candidate for using as thermal protection materials, cutting tools, high temperature electrodes, and molten metal crucibles [3,4]. Although different methods of synthesis such as solid-state reaction [5], electrochemical [6], mechanochemical [7] and self-propagating high-temperature [8] have been applied for its synthesis, however barriers, such as high synthesis temperature, long production period, low purity, relatively large crystallite size and poor sinterability, are still considered to be the challenges [9,10]. One-dimensional (1D) structures exhibit a number of unique features and properties, such as long length, high surface area, and hierarchically porous structure with excellent pore interconnectivity and enhanced electron and phonon transport properties.…”