Chemical processing and properties of nanostructured WC-Co materials

Kear, B. H.; McCandlish, L. E.

doi:10.1016/0965-9773(93)90059-k

Cited by 135 publications

(35 citation statements)

References 3 publications

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“…It has been reported that the hardness of nanostructured materials often exhibits a 2-5 fold increase compared with that of the conventional materials although it is lower than that predicted using the classical Hall-Petch equation [34][35][36]. In a related study, Kear and McCandlish [37] also indicated that nanostructured WC-23%Co coatings have a higher hardness than that of the conventional coating of the same composition. Therefore, the high hardness of the nanostructured Cr 3 C 2 -NiCr coatings results primarily from two aspects: (1) uniformity of microstructure, caused by the synthesis process of nanocomposite feedstock powder; and (2) the intrinsically high hardness of nanostructured materials.…”

Section: Microhardnessmentioning

confidence: 78%

Synthesis and Characterization of Nanocomposite Coatings

Ice

Lavernia

2000

Nanostructured Films and Coatings

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The synthesis of nanocomposite coatings is described in this paper. The nanocomposite feedstock powders are synthesized using mechanical milling, and the characteristics of the milled powders, i.e., morphology, agglomeration behavior, powder size, grain size and structural evolution during milling, are analyzed using X-ray diffraction, SEM and TEM. Using high velocity oxygen fuel (HVOF) spraying, the nanocomposite coatings are sprayed, and the microstructures and properties of the resulting coatings are characterized.

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Section: Microhardnessmentioning

confidence: 78%

Synthesis and Characterization of Nanocomposite Coatings

Ice

Lavernia

2000

Nanostructured Films and Coatings

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“…Numerous studies have been conducted to examine the relationship among feed powder characteristics, process conditions, microstructural parameters, and wear resistance of this coating [4][5][6][7][8][9][10][11][12][13][14][15][16]. Among them, more attention was paid on the improved wear resistance by nanostructured WC-Co coatings [9,[12][13][14]. However, Usmani et al [15], and Stewart et al [16] reported disappointing sliding wear and abrasive wear resistance of nanostructured WC-Co coatings for the increased decarburization, which indicates that the achievement of superior wear resistance from nanostructured coatings would require an optimization of the powder preparation and a readaptation of the spray process.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and evaluation of D-gun sprayed WC–Co coating with self-lubricating property

Sun

Hua

et al. 2006

Tribol Lett

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A WC-Co coating with self-lubricating property was deposited by detonation gun (D-gun) process, using a commercial WC-Co powder doped with a MoS 2 -Ni powder, under a proper spray condition. It is proved that the MoS 2 composition in the feed powder was kept, which is attributed to the protection of Ni around it, and its content is a little higher in the resulting coating. Evaluation on sliding wear property indicates that the MoS 2 composition plays an important role in lowering both coefficient of friction and wear rate for the resulting coating, which is confirmed by observations on wear track, as well as X-ray photoelectron spectroscope (XPS) results on worn surface. It suggests that the deposition of WC-Co coating with self-lubricating property by D-gun spray is feasible by controlling lubricant powder and spray conditions, which can exhibit higher sliding wear resistance.

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“…The literature search devoted to WC-Co hard metal [12][13][14] shows that when successively reducing the carbide phase size from micro-to submicro-and then to nanosize for Co contents kept constant, we reduce the intercarbide binder layer and simultaneously increase the hardness. The wear resistance grows both in abrasive and sliding wear tests due to achieving smaller carbide grains and thinner intercarbide binder layers which serve to limit the selective binder wear and further spalling of carbide particles [12,13].…”

Section: Abrasive Wearmentioning

confidence: 99%

Structure and Abrasive Wear of Composite HSS M2/WC Coating

Gnyusov

Durakov

Tarasov

2012

Advances in Tribology

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Features of phase-structure formation and abrasive wear resistance of composite coatings "WC-M2 steel" worn against tungsten monocarbide have been investigated. It was established that adding 20 wt.% WC to the deposited powder mixture leads to the increase in M 6 C carbide content. These carbides show a multimodal size distribution consisting of ∼5.9 μm eutectic carbides along the grain boundaries, ∼0.25 μm carbides dispersed inside the grains. Also a greater amount of metastable austenite (∼88 vol.%) is found. The high abrasive wear resistance of these coatings is provided by γ → α -martensitic transformation and multimodal size distribution of reinforcing particles.

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Chemical processing and properties of nanostructured WC-Co materials

Cited by 135 publications

References 3 publications

Synthesis and Characterization of Nanocomposite Coatings

Synthesis and Characterization of Nanocomposite Coatings

Fabrication and evaluation of D-gun sprayed WC–Co coating with self-lubricating property

Structure and Abrasive Wear of Composite HSS M2/WC Coating

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