Low-temperature synthesis of single-phase refractory metal compound carbides

Wu, Kehan; Wang, Yu; Chou, Kuo‐Chih; Zhang, Guohua

doi:10.1016/j.ijrmhm.2021.105567

Cited by 22 publications

(13 citation statements)

References 45 publications

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“…Previously, solid solution of different monocarbides in calcium melts promoted HEC powder formation. 12 In contrast, in this paper, a little iron resulting from the milling process might play a significant role in the final formation of solid solution. The detailed flow chart is shown in Figure 1.…”

Section: Introductionmentioning

confidence: 73%

“…Other parameters such as tolerance factor,t 36 φ criteria, 37 Ω-T m criteria, 38 and T SS -δ a criteria. 12 are also proposed to predict the formations of HEC. It is particularly worth mentioning that descriptors can only predict the stability of high-entropy phase theoretically, and they are merely utilized as auxiliary tools for HEC formation.…”

Section: Descriptors For Phase Formationmentioning

confidence: 99%

“…Then, this new concept was gradually extended to oxygenfree refractory metal carbides, and many face-centered cubic (FCC) HECs were successfully synthesized. 11,12 In addition, experimental work is normally devoted to the equimolar systems for a purpose of maximum entropy. 13,14 Moreover, carbides with the identical crystal structure are favored by researchers, which are mainly concentrated in Groups IVB and VB, while there was not much reported literature on systems containing elements in Group VIB, especially element Cr.…”

Section: Introductionmentioning

confidence: 99%

“…on alloys first introduced the concept of high entropy. Then, this new concept was gradually extended to oxygen‐free refractory metal carbides, and many face‐centered cubic (FCC) HECs were successfully synthesized 11,12 . In addition, experimental work is normally devoted to the equimolar systems for a purpose of maximum entropy 13,14 .…”

Section: Introductionmentioning

confidence: 99%

“…Even though the single‐phase HECs had successfully fabricated via vacuum carbothermic reduction followed by molten calcium posttreatment in the previous work, 12 the strict experimental conditions including up to 60:1 of ZrO 2 ball/powder ratio (BPR) and an individual batch of .5g severely affected the production efficiency. Meanwhile, an ultra‐high BPR could cause a severe composition segregation when jars and balls were made of ZrO 2 .…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of high entropy carbide powders by low temperature processing

Wang

Cui

et al. 2022

Int J Applied Ceramic Tech

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High-entropy carbides (HECs) possess superior properties such as favorable corrosion resistance and marvelous hardness and are widely applied in specific extreme environments. Herein, a novel method was proposed for synthesizing HECs powders with raw materials of corresponding oxides and carbon black, which was composed of steps of ball-milling in stainless jar, carbothermic reduction at 1873 K, as well as the following calcium posttreatment at 1273 K to remove residual carbon by generating CaC 2 . Finally, pure HECs powders could be fabricated after acid leaching treatment. Under the current experimental conditions, besides HfC-TaC-ZrC-NbC quaternary system, a homogeneous solid solution could be fabricated by adding Mo or/and Ti, but it could not be achieved for systems with addition of V, W, or Cr, owing to the low lattice constant or different crystal structure of corresponding carbides. In the reduction step, iron resulted from ball milling process acted as the diffusion channel to promote the mutual diffusion of different components. Meanwhile, the calcium treatment temperature had a weak effect on particle size of HEC powders. HfC-TaC-ZrC-NbC-MoC-TiC powders prepared at the calcium posttreatment temperature of 1273 K had an oxygen content of .302% and an average grain size of 252 nm.

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Section: Introductionmentioning

confidence: 73%