The Effect of Surface Roughness on Wear-Life of DLC Coated Silicon Disk in Dry Sliding

2006 ◽  
Vol 110 ◽  
pp. 213-220 ◽  
Author(s):  
Kyung Seob Shin ◽  
Chung Woo Cho ◽  
Young Ze Lee
Keyword(s):  
Surface Roughness ◽  
Substrate Surface ◽  
Dry Sliding Wear ◽  
Dry Sliding ◽  
Transfer Layer ◽  
Dlc Coating ◽  
Real Area Of Contact ◽  
Wear Life ◽  
Friction Regime ◽  
Substrate Surface Roughness

Dry sliding wear resistance of DLC coated silicon disk with different surface roughness has been evaluated using a ball-on-disk sliding tester. It was found that the transfer layer formed on steel ball produced a low friction regime and the formation of transfer layer was more active with increasing the substrate surface roughness. The wear life of DLC coating was increased as increasing the real area of contact.

EFFECT OF SURFACE ROUGHNESS ON THE ADHESIVE AND TRIBOLOGICAL CHARACTERISTICS OF DLC COATING PREPARED ON Co-Cr-Mo ALLOY

2002 ◽  
Vol 16 (06n07) ◽  
pp. 952-957 ◽  
Author(s):  
D. Sheeja ◽  
B. K. Tay ◽  
H. M. Lam ◽  
S. K. Ng
Keyword(s):  
Surface Roughness ◽  
Life Span ◽  
Substrate Surface ◽  
Resistance Coefficient ◽  
Metal Alloy ◽  
Deposition Condition ◽  
Dlc Coatings ◽  
Dlc Coating ◽  
Short Life Span ◽  
Substrate Surface Roughness

The Co-Cr-Mo alloy is extensively used for tribological applications, including orthopaedic components in total joint replacements. High quality diamond-like carbon (DLC) coatings on metal/alloy substrates are of great interest as they are able to protect them from severe wear and thus prolong the life span of the component. Since the roughness of the metal/alloy varies depending on the applications, a study has been carried out to investigate the effect of substrate surface roughness on the microstructure, sliding life, wear-resistance, coefficient of friction, adhension and hardness of DLC coatings prepared on Co-Cr-Mo alloy substrates under the same deposition condition. The microstructure of the films studied using Raman spectroscopy suggests that the film prepared on a smoother surface contains slightly higher fraction of sp 3 bonded carbon atoms. The characterization using a pin-on-disk tribometer reveals that, the film prepared on the roughest sample (Ra ~ 0.06 μm) exhibits a very short life span of about 20 cycles compared to the film that is prepared on a relatively smoother surface (Ra ~ 0.02 μm), which exhibits a life span of about 340,000 cycles. In order to investigate the origin of this improved property of the DLC film on the smoother surface, adhesive strength and hardness of the films were studied by using a micro-scratch tester and a Nano-indenter, respectively. The results suggest that the film prepared on the smoother surface exhibits better adhesion (higher critical load) and relatively higher hardness.

Determination of Spread Activation Energy and Assessment of Wetting Behavior of Solders on Metallic Substrates

2010 ◽  
Vol 132 (4) ◽  
Author(s):  
K. N. Prabhu ◽  
G. Kumar
Keyword(s):  
Surface Roughness ◽  
Operating Temperature ◽  
Substrate Surface ◽  
Substrate Material ◽  
Metallic Substrates ◽  
Wetting Behavior ◽  
Substrate Surface Roughness ◽  
Exponential Power ◽  
Kinetics Of

The effects of substrate material, substrate surface roughness, and operating temperature on the wetting behavior of Sn–37Pb, Sn–3.5Ag, and Sn–9Zn eutectic solders on metallic substrates were investigated. Solder spreading kinetics was successfully represented by the exponential power law (EPL): ϕ=exp(−Kτn). The EPL parameter K has the significance of accelerating the kinetics of relaxation while the parameter n represents the resistance to spreading process (spread resistance parameter). EPL parameters exhibited a decreasing trend with an increase in surface roughness. Estimated activation energies for solder spreading were found to be in between those reported for inert and highly reactive spreading systems.

Stretchability enhancement of buckled polypyrrole electrodes for stretchable supercapacitors via engineering substrate surface roughness

2020 ◽  
Vol 343 ◽  
pp. 136099 ◽  
Author(s):  
Chen Zhao ◽  
Xiaoteng Jia ◽  
Kewei Shu ◽  
Changchun Yu ◽  
Yonggang Min ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Substrate Surface ◽  
Substrate Surface Roughness

The effect of substrate surface roughness on the nucleation of cubic boron nitride films

2006 ◽  
Vol 15 (1) ◽  
pp. 55-60 ◽  
Author(s):  
C.Y. Chan ◽  
S. Eyhusen ◽  
X.M. Meng ◽  
I. Bello ◽  
S.T. Lee ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Boron Nitride ◽  
Substrate Surface ◽  
Cubic Boron Nitride ◽  
Substrate Surface Roughness ◽  
Boron Nitride Films
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