Preparation and Characterization of UltraHigh‐Temperature Ternary Ceramics Ta 4 HfC 5

Self Cite

A novel molten salt synthesis route has been developed to prepare ternary La1‐xCexB6 (x = 0.2, 0.4, 0.6, 0.8), using LaCl3, CeCl3, and NaBH4 as reactants and eutectic LiCl/KCl salt as molten salt medium. All the synthesized ternary La1‐xCexB6 are single‐phase solid solution, and their lattice constant decreases linearly with increasing x. Morphology, microstructure, and elements composition of La0.6Ce0.4B6 which is a typical representative of the series of La1‐xCexB6 are analyzed in detail.

Section: Resultsmentioning

confidence: 96%

Fabrication and characterization of ternary La_1‐_xCe_xB₆ by a novel molten salt synthesis route

Wang

2018

Self Cite

“…The development of new generation of space vehicles has recently been reviving strong interest into a special class of refractory materials popularly known as the ultra‐high temperature ceramics (UHTCs) in that they possess potential applications in thermal protection structures and engine parts in next‐generation re‐entry space vehicles . As members of UHTCs, solid‐solution ceramics of transition‐metal carbides (MC), borides and nitrides are of particular interest due to their unique properties resulting from the solid solutions of the different metal compounds . In particular, MC solid‐solution ceramics have attracted considerable attention among these solid‐solution ceramics because of their extremely high melting points, high hardness, and high thermal and electric conductivity and are promising candidates for use in industrial, space, and armor applications .…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of (Zr_1/3Nb_1/3Ti_1/3)C metal carbide solid‐solution ceramic

Chu

Huang

et al. 2018

(Zr1/3Nb1/3Ti1/3)C metal carbide solid‐solution ceramic has been successfully fabricated by hot pressing sintering at 2473 K using ZrC, NbC, and TiC powders as raw materials. The results show that the as‐prepared solid‐solution ceramic possesses a single rock‐salt crystal structure of metal carbides and simultaneously exhibits high compositional uniformity from nanoscale to microscale. By taking advantage of these unique features, it shows relatively high hardness of 38.8 ± 4.4 Gpa and elastic modulus of 481.8 ± 31.0 Gpa and relatively low thermal conductivity of 17.1 ± 0.3 W/(m·K) and thermal diffusivity of 6.1 ± 0.1 mm2/s, which may attribute primarily to the presence of solid solution effects.

“…Among those advanced fabrication methods, PDC route is considered as an ideal route to obtain ceramic matrix composites due to its advantage of polymer‐processing techniques . Nevertheless, only the binary Ta 4 HfC 5 ceramics have been successfully synthesized by PDC route until now . Synthesizing the ternary or more component solid‐solution ceramics of transition‐metal carbides via PDC route is still a great challenge for the scientific community.…”

Section: Introductionmentioning

confidence: 99%

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

Liu

Chu

2020

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.