Wear engineering oxides/anti-wear oxides

Woydt, Mathias; Skopp, A.; Dörfel, I.; Witke, K.

doi:10.1016/s0043-1648(98)00181-1

Cited by 153 publications

(69 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The second composition was achieved by a customized addition of Mo in order to evaluate its effect on the properties of the resulting coatings. Several authors have reported the beneficial effect of lubricious oxides such as MoO 3 and NiMoO 4 on reducing the friction coefficient and, consequently, on improving sliding wear behavior [15][16][17]. Two conventional HVOF-sprayed Ni-based and WC-based coatings were chosen as reference.…”

Section: Introductionmentioning

confidence: 99%

Microstructural Characteristics and Tribological Behavior of HVOF-Sprayed Novel Fe-Based Alloy Coatings

et al. 2014

View full text Add to dashboard Cite

Thermally-sprayed Fe-based coatings have shown their potential for use in wear applications due to their good tribological properties. In addition, these kinds of coatings have other advantages, e.g., cost efficiency and positive environmental aspects. In this study, the microstructural details and tribological performances of Fe-based coatings (Fe-Cr-Ni-B-C and Fe-Cr-Ni-B-Mo-C) manufactured by High Velocity Oxygen Fuel (HVOF) thermal spray process are evaluated. Traditional Ni-based (Ni-Cr-Fe-Si-B-C) and hard-metal (WC-CoCr) coatings were chosen as references. Microstructural investigation (field-emission scanning electron microscope FESEM and X-Ray diffractometry XRD) reveals a high density and low oxide content for HVOF Fe-based coatings. Particle melting and rapid solidification resulted in a metastable austenitic phase with precipitates of mixed carbides and borides of chromium and iron which lead to remarkably high nanohardness. Tribological performances were evaluated by means of the ball on-disk dry sliding wear test, the rubber-wheel dry particle abrasion test, and the cavitation erosion wear test. A higher wear resistance validates Fe-based coatings as a future alternative to the more expensive and less environmentally friendly Ni-based alloys.

show abstract

Section: Introductionmentioning

confidence: 99%

Microstructural Characteristics and Tribological Behavior of HVOF-Sprayed Novel Fe-Based Alloy Coatings

et al. 2014

View full text Add to dashboard Cite

show abstract

“…However, these materials exhibit a significant drawback, a low oxidation resistance. Consequently, oxide materials have become more interesting for tribological applications due to their expected ''oxidation stability'' and their low tribo-oxidation sensitivity [1]. There are few research works dealing with tungsten oxide with different oxygen contents focused mainly on electrical and optical properties [2].…”

Section: Introductionmentioning

confidence: 99%

Tungsten oxide with different oxygen contents: Sliding properties

Polcar

Parreira

Cavaleiro

2007

Vacuum

View full text Add to dashboard Cite

In this study, tungsten oxide coatings with 13 and 75 at% of oxygen were prepared by DC reactive magnetron sputtering from a pure W target in an Ar+O 2 atmosphere. The coating hardness (H) decreased with increasing oxygen content from 25 to 7.7 GPa. The values of H/E ratio were 0.08 and 0.07 for W 87 O 13 and W 25 O 75 , respectively.The tribological measurements were carried out on a pin-on-disc tribometer at room temperature, with a load of 5 N and steel 100Cr6, ceramic Si 3 N 4 and Al 2 O 3 balls as sliding partners. The wear track and wear debris were visualised by scanning electron microscopy and the chemical composition of the later was estimated by energy-dispersive X-ray analysis. The friction coefficient was rather high in case of the W 87 O 13 coating reaching values in the range from 0.7 to 0.75 for both counterpart materials, and slightly lower for W 25 O 75 ($0.50). The coating wear rate decreased with increasing oxygen content with the Al 2 O 3 ball, while using Si 3 N 4 ball as a counterpart showed an opposite trend. The coating with low oxygen content was more resistant to abrasive wear. r

show abstract

“…The spectra taken in the wear track is shown in Figure 8 performance as a highly lubricious tribofilm reducing friction and wear has been widely reported [22]. Mechanical characterisation of these oxides has shown that they have the capacity of elasto-plastic deformation so that high shear stress and normal pressure can be supported by this tribo-film without increase of frictional stress.…”

Section: Mechanical and Tribological Propertiesmentioning

confidence: 89%