Synthesis of the ternary metal carbide solid‐solution ceramics by polymer‐derived‐ceramic route

Abstract

The polymer‐derived‐ceramic (PDC) route has been widely used to fabricate the transition‐metal carbides (TMCs). Previously reported works focused mainly on the synthesis of the single or binary TMCs, while the synthesis of the ternary or more component TMCs was rarely reported. Herein, a class of the ternary TMCs, namely (Nb1/3Zr1/3Ta1/3)C solid‐solution ceramics, was successfully synthesized via PDC route for the first time. The as‐synthesized ceramics exhibited the particle‐like morphology with an average particle size of ~250 nm and showed a single rock‐salt crystal structure of metal carbides. At the same time, they had high compositional uniformity from nanoscale to microscale. In addition, they possessed low‐oxygen impurity content of 0.79 wt% and moderate‐carbon impurity content of 8.98 wt%. Such work provides a novel route to fabricate the ternary or more component TMCs.

Using PyC modified 3D carbon fiber to reinforce UHTC under low temperature sintering without pressure

“…Due to the extremely high melting point (over 3000 ℃), excellent oxidation and ablation resistance, UHTCs and their composites are generally accepted for using in oxidation environments above 1800 ℃, retaining non-ablation characteristics and structural integrity [25][26][27][28][29]. However, the main obstacle toward engineering applications of UHTCs is symmetrically distributed strong covalent bonds, which lead to intrinsic brittleness and low damage tolerance [30].…”

Hierarchical porous (Ta 0.2Nb 0.2Ti 0.2Zr 0.2Hf 0.2)C high-entropy ceramics prepared by a self-foaming method for thermal insulation

“…However, these M-O bonds do not match well with the corresponding oxides. The shift in these transition metal peaks to lower binding energy is due to the formation of the coordination complex of transition metal [48,49]. The XPS results confirm the formation of polymeric precursors composed of transition metals (Ta, Nb, Ti, Zr, and Hf).…”

Single-source precursor derived high-entropy metal–carbide nanowires: Microstructure and growth evolution

“…2(a). The spectrum reveals several transmittance peaks, such as 2961 cm −1 , 2881 cm −1 (C-H), 1589 cm −1 (C=O), 1525 cm −1 (C=C), 1470 cm −1 (C-C), and 1282 cm −1 (C-O), indicating the presence of acetylacetone ligands on polymer precursor 's side chains [26,30]. Transmittance peaks at 1590, 864, 1354, and 1255 cm −1 are assigned to C=O, C-H, -CH 3 , and C-O, respectively, demonstrating the existence of acetylacetone monomers [26,30].…”