Preparation of chromium carbide coatings on graphite via powder immersion reaction assisted coating

Qing, Huawen; Wu, Zhenyu; Li, Huizheng; Guo, Haibo; Chen, Yigang

doi:10.1016/j.ceramint.2021.08.282

Cited by 8 publications

(1 citation statement)

References 19 publications

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“…Transition metal carbides (TMCs) find widespread use throughout industry due to their impressive high-resilience properties, which often include a combination of high melting points, microhardness, high thermal and electrical conductivity, and corrosion resistance. − These properties are especially pronounced in chromium carbides, which are used in a broad range of demanding applications. For example, Cr 3 C 2 ( Pnma ) embedded within a NiCr binder is used for high-temperature and oxidation-resistant coatings in steam and gas turbines; , Cr 7 C 3 ( Pnma ) excels as a wear- and heat-resistant coating in bearing shafts, seals, and furnaces; − self-lubricating nanocomposites of amorphous CrC y and the nanocrystalline NaCl-type CrC (1– x ) ( Fm 3̅ m ) thin films are promising materials for replacing noble metals in sliding electrical contacts; and Cr 3 C 2 ( Pnma ) embedded within carbon nanofibers shows improved cycling stability compared with conventional lithium/sulfur batteries …”

Section: Introductionmentioning

confidence: 99%

Combined First-Principles and Experimental Investigation into the Reactivity of Codeposited Chromium–Carbon under Pressure

Marshall,

Thiel,

Cote

et al. 2023

ACS Mater. Au

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High-pressure synthesis in the diamond anvil cell suffers from the lack of a general approach for the control of precursor stoichiometry and homogeneity. Here, we present results from a new method we have developed that uses magnetron cosputtering to prepare stoichiometrically precise and atomically mixed amorphous films of Cr:C. Laser-heated diamond anvil cell experiments carried out on a flake of this sample at pressures between 13.5 and 24.3 GPa lead to the observation of Cr 3 C (Pnma) over the entire pressure range�in good agreement with our in-house theoretical predictions�but also reveal two other metastable phases that were not expected: a novel monoclinic chromium carbide phase and the NaCl-type CrC (Fm3̅ m) phase. The unexpected stability of CrC is investigated by using firstprinciples methods, revealing a large stabilizing effect tied to substoichiometry at the carbon site. These results offer an important case study into the current limitations of crystal structure prediction methods with regard to phase complexity and bolster the growing need for advanced theoretical approaches that can more completely survey experimentally unexplored phase space.

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