Nanocrystalline Composites for Thermal Spray Applications

Gärtner, F.; Bormann, R.; Klassen, Thomas; Kreye, H.; Mitra, Niladri

doi:10.4028/www.scientific.net/jmnm.8.933

Cited by 4 publications

(3 citation statements)

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“…The adhesion of TiC to nickel can be improved by alloying Mo to the TiC-Ni cermet. The highest improvement in wear resistance was reached by using (Ti,Mo)(C,N) instead of TiC [1,3]. Further improvement in wear resistance could be reached by refining the microstructure, i.e.…”

Section: Introductionmentioning

confidence: 81%

“…For instance, Qiao et al [21] produced coatings of WC-Co showing inferior or superior wear resistance of nanocrystalline coatings compared to conventional coatings, depending on the spray parameters used. Additionally, results by Gärtner et al [1,3,22] indicated that nanocrystalline TiC-Ni-based coatings produced by thermal spraying only under certain conditions show a higher wear resistance compared to conventional microcrystalline coatings. Also Economou [23] investigated the tribological behaviour of TiC-reinforced plasma sprayed microstructured coatings and indicated that low pressure plasma sprayed (LPPS) coatings show better wear resistance than air plasma sprayed (APS) coatings on the basis of the same composition.…”

Section: Introductionmentioning

confidence: 99%

“…However, compared to WC-Co the wear resistance is about an order of magnitude lower. TiC-Ni based cermets can bridge up the gap between WC-Co and Cr 2 C 3 -NiCr with comparable good performance under abrasive and corrosive attacks and high stability against oxidation up to temperatures of about 700 C [1][2][3][4]. In addition, TiC is also considerably cheaper than WC [5].…”

Section: Introductionmentioning

confidence: 99%

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Abrasive wear mechanisms of VPS‐ and HVOF‐sprayed TiC‐Ni based nanocrystalline coatings

Qi¹,

Aust²,

Eigen³

et al. 2004

Materialwissenschaft Werkst

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Nanocrystalline coatings have a high potential for various engineering applications, e.g. against wear of rolls in the paper fabrication and as corrosion protection. Using vacuum plasma spray (VPS) and high velocity oxy-fuel (HVOF) spray techniques, coating materials are exposed to high flame temperatures only for less than a millisecond. Therefore, high-energy milled powders can be used as feedstock material without losing its nanocrystalline microstructure during the thermal spray process. In this way, homogeneous, dense nanocrystalline coatings can be produced, which show enhanced hardness, thus obtaining promising superior wear resistance. In the present study, (Ti,Mo)(C,N)-45vol.%NiCo nanocrystalline coatings were prepared by VPS-and HVOF-spraying of high-energy milled powders. Abrasive wear tests JIS H 8615 with varying number of strokes and scratch tests with a Vickers indenter were applied to produce wear traces on the polished surfaces of the nanocrystalline coatings. Abrasive wear behaviour was analyzed by investigating the surface morphologies with optical microscopy (OM), scanning electron microscopy (SEM) and atomic force microscopy (AFM). Experimental results indicate that the VPS-coating has higher abrasive wear resistance than the HVOF-coating according to the JIS H8615 test. The abrasive wear mechanism of VPS-sprayed nanocrystalline coatings can be delineated as cutting plus ploughing. For HVOF-sprayed nanocrystalline coatings the abrasive wear mechanism can be described as cutting plus material delamination.Key words: wear mechanism, nanocrystalline coating, TiC-Ni, thermal spray.

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Section: Introductionmentioning

confidence: 81%