Influences of Various Zr Target Current on Tribological Behavior of a-C:H:Zr-x Coatings

2015 ◽  
Vol 642 ◽  
pp. 84-88
Author(s):  
Wen Hsien Kao
Keyword(s):  
Tribological Properties ◽  
Friction And Wear ◽  
Point Contact ◽  
Deposition Process ◽  
Process Conditions ◽  
Wear Depth ◽  
Unbalanced Magnetron Sputtering ◽  
Unbalanced Magnetron ◽  
Aisi 52100 ◽  
Wear Mode

A series of a-C:H:Zr-x coatings (the x in the term a-C:H:Zr-x is the Zr target current varied in the deposition process) have been deposited on AISI M2 steel used unbalanced magnetron sputtering system (UBMS). During deposition process, different a-C:H:Zr-x topcoats were deposited by varying the Zr target current from 0.0 A to 0.5A while maintaining the remaining process conditions at the constant settings. The microstructure, adhesion and tribological properties of the a-C:H:Zr-x coatings were found to vary with the Zr content. The tribological properties of the coatings had been tested against AISI 52100 or Si3N4 counterbody under ball-on-disk point contact wear mode using an oscillating friction and wear tester. Of the various coatings, the a-C:H:Zr-0.4 coating provided the best tribological properties, including the lowest wear depth, the friction coefficient and the longest lifetime. Compare to the coatings sliding against both counterbodies, all of coatings possessed the high wear depth as sliding against Si3N4, but it displayed longer wear lifetime than sliding against AISI 52100.

The Effect of CN Coatings Doped with Niobium, Titanium and Zirconium Metal on Mechanical, Tribological and Corrosion Resistance Properties of Thin Films

2019 ◽  
Vol 823 ◽  
pp. 81-90 ◽  
Author(s):  
Yen Liang Su ◽  
Wen Hsien Kao ◽  
Yu Chien Chang
Keyword(s):  
Corrosion Resistance ◽  
Wear Rate ◽  
Elastic Recovery ◽  
Chemical Characterization ◽  
Corrosion Current ◽  
Xrd Analysis ◽  
Wear Depth ◽  
Corrosion Properties ◽  
Unbalanced Magnetron Sputtering ◽  
Unbalanced Magnetron

CN-Nb, CN-Ti and CN-Zr that are respectively doped with Nb, Ti and Zr metal in a CN coating are deposited on SKH51 substrate using DC unbalanced magnetron sputtering (DC-UBM). The coatings’ chemical characterization, morphology, mechanical, tribological and corrosion properties are determined. The XRD analysis shows when a low content of metal is added, the coatings exhibit DLC structures. Result from the incorporation of metals, coatings performed denser texture. Simultaneously, the surface became smoother and denser while surface roughness varied from 0.036 to about 0.020 mm. Various properties are improved over CN coating, CN-Ti has a 64% greater hardness at 21.9 Gpa and adhesion 26% better, with a critical load of 87 N. The elastic recovery ranges from 68% (CN) to 100% (CN-Nb and CN-Zr), the wear rate varies from 0.51 10-6mm3/Nm (CN) to 0.1 10-6mm3/Nm (CN-Zr) and the wear depth is reduced by about 73%. An increase in the elastic recovery gives a decreased wear rate. In addition, the corrosion resistance is increased because there is a decrease in the corrosion current density and the CN-Zr coating performed about 35 times better than a CN coating.

Tribological Properties of DLC Coating with Various Zr Target Current

2017 ◽  
Vol 739 ◽  
pp. 23-29
Author(s):  
Wen Hsien Kao
Keyword(s):  
Mechanical Properties ◽  
Tribological Properties ◽  
Photoelectron Spectroscopy ◽  
Wear Depth ◽  
X Ray Diffraction ◽  
Properties Of Coatings ◽  
X Ray ◽  
Dlc Coating ◽  
Unbalanced Magnetron ◽  
G Ratio

The main purpose of this study is to research the tribological properties and mechanical properties of diamond-like carbon coating (DLC) used unbalanced magnetron sputtering system (UBMS). The objective is influence of various Zr target current on the properties of coatings, current from 0.0 A to 0.5 A. The cross-section morphology was observed by field emission scanning electron microscopy (FE-SEM). With the increase of the Zirconium targets current, the quantity contained of the Zirconium increases. Raman spectroscopy, X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) were employed to analyze the microstructure properties of the coatings. The nanoindentation tester was used to measure the mechanical properties. Furthermore, the wear tests were achieved through the Schwingung Reibung and Verschliess (SRV) reciprocating wear tester under dry condition. The DLC coating was deposited used 0.4 A Zr target current possessed the lowest I(D)/I(G) ratio, the highest sp3 content and highest hardness. The DLC coating (0.4A) also displayed excellent tibological properties including the lowest friction coefficient, and wear depth.

scholarly journals Influence of Carbon: Metal Ratio on Tribological Behavior of Mo-W-C Coating

2021 ◽  
Vol 11 (21) ◽  
pp. 10189
Author(s):  
Paranjayee Mandal
Keyword(s):  
Magnetron Sputtering ◽  
Ambient Temperature ◽  
Tribological Properties ◽  
Friction Reduction ◽  
Low Friction ◽  
Unbalanced Magnetron Sputtering ◽  
Debris Particles ◽  
Unbalanced Magnetron ◽  
Coating Microstructure ◽  
Metal Ratio

Mo-W-C coatings with three different C/(Mo+W) ratios (5:1, 2.8:1 and 2.2:1) were deposited by using combined unbalanced magnetron sputtering (UBMS) and high-power impulse magnetron sputtering (HIPIMS) technology. The influence of the C/(Mo+W) ratio on coating microstructure and related tribological properties at ambient temperature and at 200 °C were studied in lubricated condition (up to 7500 m and 1800 m of sliding distances, respectively). Results showed that a decrease in the C/(Mo+W) ratio could be correlated with an increase in coating thickness, adhesion strength, hardness and elastic modulus values, and a decrease in the degree of graphitization. At ambient temperature, outstanding tribological properties (very low friction and negligible wear) were observed irrespective of the C/(Mo+W) ratio. At 200 °C, low C/(Mo+W) ratios (2.8:1 and 2.2:1) were found particularly beneficial to achieve excellent tribological properties. The keys to significant friction reduction at 200 °C were (i) in situ formation of MoS2 and WS2 due to tribo-chemical reactions and (ii) presence of amorphous carbon debris particles in the protective tribolayer. With an increase in sliding distance, the tribolayer gradually lowered the friction coefficient by protecting both the coating and counterpart from severe wear. On the other hand, a high C/(Mo+W) ratio (5:1) led to low friction but noticeable abrasive wear at 200 °C.

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