Effects of milling and subsequent consolidation treatment on the microstructural properties and hardness of the nanocrystalline chromium carbide powders

Sharafi, S.; Gomari, S.

doi:10.1016/j.ijrmhm.2011.07.004

Cited by 27 publications

(13 citation statements)

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“…It is found in their study that between 2 h and 6 h of ball milling, agglomerations were changed and Gomari and Sharafi demonstrated that angular-shaped Cr powders, when mixed with irregular-shaped C powders using ball milling under inert gas atmosphere, led to cold welding of powders. It is found in their study that between 2 h and 6 h of ball milling, agglomerations were changed and primary Cr clusters were destroyed and their size began to decrease with an increase in milling time ( Figure 4) [70]. These particles led to fracture after 6 h of milling, and a steady state was achieved after 10 h of milling [70].…”

Section: Characterization Of Nano-crystalline Powder Synthesized By Mmentioning

confidence: 94%

“…primary Cr clusters were destroyed and their size began to decrease with an increase in milling time ( Figure 4) [70]. These particles led to fracture after 6 h of milling, and a steady state was achieved after 10 h of milling [70].…”

Section: Characterization Of Nano-crystalline Powder Synthesized By Mmentioning

confidence: 99%

“…The powder particles are subjected to severe mechanical deformation during high-energy ball milling, where they are repeatedly deformed, cold welded, fractured, and re-welded. Initially, Cr clusters are destroyed in the milling process and the fine particles are formed, which are further reduced with increasing milling time [6,25,[66][67][68][69][70][71].…”

Section: Characterization Of Nano-crystalline Powder Synthesized By Mmentioning

confidence: 99%

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Nanocrystalline Cermet Coatings for Erosion–Corrosion Protection

et al. 2019

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The processing techniques, microstructural characteristics, and erosion corrosion behaviour of Cr3C2–NiCr and tungsten carbide (WC)-based cermet coatings are reviewed in this work. Conventional and nanocrystalline Cr3C2–NiCr and WC-based cermet coatings are generally synthesized using thermal spray technique. The wear, erosion, and corrosion protection ability of conventional and nanocermet coatings are compared based on available literature. In Cr3C2–NiCr coatings, the corrosion resistance is offered by NiCr metal matrix while the wear resistance is provided by the carbide ceramic phase, making it suitable for erosion–corrosion protection. The nanocrystalline cermet coatings exhibits better erosion–corrosion resistance as compared to the conventional coatings. The nanocrystalline coatings reduces the erosion–corrosion rate significantly compared to conventional coatings. It is attributed to the presence of the protective NiCr metallic binder that allows easier and faster re-passivation when the coating is subjected to wear and the fine-grain structure with homogeneous distribution of the skeleton network of hard carbide phases. In addition, corrosion-accelerated erosion dominates the reaction mechanism of erosion–corrosion and, therefore, higher hardness, strength, and better wear resistance of nanocermet coating along with its faster repassivation kinetics accounts for improved corrosion resistance as compared to conventional coatings.

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Section: Characterization Of Nano-crystalline Powder Synthesized By Mmentioning

confidence: 94%

Section: Characterization Of Nano-crystalline Powder Synthesized By Mmentioning

confidence: 99%

Section: Characterization Of Nano-crystalline Powder Synthesized By Mmentioning

confidence: 99%

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Nanocrystalline Cermet Coatings for Erosion–Corrosion Protection

et al. 2019

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“…Furthermore, the prepared carbide powders exhibit grains in micron range, which cannot satisfy the demands of carbide powders for modern industry. Nowadays, various methods for synthesizing carbide powders have been researched, e.g., direct element reaction [17,18], mechanical alloying [19,20], temperature-programmed reaction [21] and gas reduction-carburization [22]. However, industrial applications of these methods are still limited due to the agglomeration problems, wide size distributions, low yields, complex monitoring and high costs.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of vanadium and chromium carbides (V8C7–Cr3C2) nanocomposite via an in situ precursor method

Zhao

Zheng

et al. 2015

Rare Met.

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In situ synthesis method was used to prepare V 8 C 7 -Cr 3 C 2 nanocomposite. Ammonium vanadate, ammonium dichromate and nanometer carbon black were used as raw materials. The products were characterized by X-ray diffractometry (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), thermogravimetric and differential scanning calorimetry (TG-DSC) and X-ray photoelectron spectroscopy (XPS) techniques. The results show that V 8 C 7 -Cr 3 C 2 nanocomposite with an average crystallite size of 25.4 nm can be synthesized at 1200°C for 1 h. The synthesis temperature required by the method is at least 200°C lower than that required by the conventional approaches for preparing vanadium and chromium carbides. The powders show good dispersion and are mainly composed of spherical or nearly spherical particles with a mean diameter of about 30 nm. The weight loss ratio of the precursor throughout the reaction process reaches 58 wt%. Three exothermic peaks and four endothermic peaks occur during the reaction. The surface of the specimen is mainly composed of V, Cr, C and O elements.

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“…In direct synthesis, metal chromium is directly reacted with a carbon source at high temperature to yield Cr 3 C 2 [4][5][6]. For example, Sharafi et al have prepared nanocrystalline Cr 3 C 2 powders using high energy milling to form a mixture of metal chromium and carbon powder, which was then compacted and sintered at 1100 1C [7]. Cr 3 C 2 can be also synthesized as an interfacial coating by immersing carbon fibers into a Cu-Cr melt maintained at 1150 1C [8].…”

Section: Introductionmentioning

confidence: 99%