The tribology characteristics of the graphene coated PA6 were evaluated with scratch experiments. As a result, the following conclusions were obtained. The PA6 of the graphene coating shows a 0.1 improvement in friction coefficient and a lower abrasion depth than PA6 in the variable pressure-type scratch experiments. PA6 of the graphene coating showed a lower friction coefficient of 0.2 or more than PA6 in the friction coefficient in the static pressure scratch experiments, indicating that wear resistance was improved. In both the variable and the static pressure type scratch experiments, the tip depth of graphene-coated PA6 shows a thinner wear depth than PA6, showing the effect of graphene. The graphene content showed excellent tribology characteristics at 3%, and there was no difference in tribology characteristics at higher contents.

The tribological properties of TiC, TiN and TiC/TiN coatings on steels prepared by the cathodic-arc (CA) ion plating technique were investigated. Experiments were carried out on a tribo-test machine using a Falex journal V block system. The friction and wear characteristics of the coatings were determined by varying the applied load and sliding speed. The TiC, TiN and TiC/TiN coatings markedly increased the tribological characteristics of the surface. As far as a single layer coating was concerned, TiN goes better results than TiC. However, the TiC/TiN multilayer coating performed better than either single layer coating. The major factor in the improved performance of the multilayer coating was the role of TiC in improving the adhesion between the external TiN layer and the substrate steel.

High-temperature friction performances of graphite blocks (GBs) and zinc phosphate impregnated graphite blocks (IGBs) were evaluated under various friction temperatures. The surface of IGB exhibited extremely lower average friction coefficient values, that was 0.007 at 400 °C and 0.008 at 450 °C, in comparison to that of GB (0.13 at 400 °C and 0.16 at 450 °C, respectively). The worn surface of IGB in the high-temperature friction test was smoother and more complete than that of GB. The wear under high temperature and load caused the transformation of zinc pyrophosphate to zinc metaphosphate and the formation of a continuous large-area boundary lubrication layer combined with graphite and metallic element on the wear surface. The superior tribology property of IGB could be attributed to the digestion of iron oxides by tribo-chemical reactions and passivation of the exposed dangling covalent bonds. Specifically, the layered structure generated on the IGB wear interface effectively decreased the adhesive forces and prevented the surface from serious damage.

This paper presents a Raman spectroscopy study of the influence of methane flow on the micro-tribological behavior of diamond-like carbon coatings deposited with an industrial plasma-enhanced chemical vapor deposition system. Results have shown a direct relationship between the methane flow and thickness of the coatings. The analysis of the Raman spectra and deposition parameters allowed establishing the influence of H content with the methane flow, the disorder level and estimation of the sp3 fraction on the carbon coatings. The micro-tribology tests showed a strong dependence of the wear resistance and hardness with Raman parameters. The coating deposited at 72-sccm methane flow presented a thickness of 1.7 μm and a sp3 fraction of 0.33. This sp3 fraction gave rise to a hardness of 24 GPa and an excellent wear resistance of 3.3 × 10–6 mm3 N−1 mm−1 for this DLC coating. Wear tests showed a swelling in the wear profiles on this coating, which was associated with the occurrence of a re-hybridization process.

In order to determine the wear properties of CVD ceramic coatings, wear process was evaluated using the coated pin of Falex Tribosystem. Also, in order to determine the effects of coating material on wear process, TiC,N of thickness 5m∼6m coated by Thermal CVD method were applied. The wear property of TiC,N film, the higher the deposition temperature was, the closer the lattice parameter was to the amount of the standard power, and the grain size increased. According to the wear formation, under the control that there is on specific wear rate wear parameter and coating delamination, decrease with increasing sliding friction and when the coating delamination happened.

The types, properties, and processes for wear resistance are reviewed from the viewpoints of material properties, metallurgy, and tribology. Though materials such as ceramics and polymers are used as the wear resistances materials to provide various useful properties, they can offer excellent corrosion and wear resistances as well as mechanical, physical and chemical properties when combined with metal materials. This paper presents, first of all, the concept of surface, kinds of wear resistances and methods based on the characteristics of surface. For that reason classifies wear resistances followed by each surface modification. This, combined with numerous sophisticated wear resistances processes recently developed, makes them the choice of modifications in a large number of applications. This review has been written with an emphasis on wear resistance consisting materials as opposed to metals, ceramics and polymers. It is hoped that this review will serve as a useful source for literature survey as well as an introduction to the subject of wear resistance with materials.

Hydrophobic nanodiamond (ND) were dispersed in engine oil (Helix Oil, Shell co.) as an additives to improve tribology properties. In this study, nanodiamond prepared by an explosive method was used. Tribology properties of both pure Helix oil and engine oil containing ND additive were evaluated. The rotating disks were made of Gray Cast Iron (240 Hv) and SKD11 (710 Hv). Surface topographies of the disks' wear tracks and friction coefficient were compared. The results show that nanodiamond-dispersed lubricants are capable of reducing these metals' wear loss. The friction coefficient is strongly affected to the hardness of wear track.

DLC(diamond-like carbon)박막을 RF PCVD법으로 증착하여 일반적인 증착특성과 마찰.마모특성사이의 관계를 알아보기 위해, 증착속도, 박막경도, 내무압축응력 및 박막내의 수소량 측정을 통해 일반적인 증착특성을 조사하였다. 그리고 증착된 박막의 C-H 결합구조와 물질특성 분성을 위해 각각 FTIR 및 Raman분광분석을 행하였다. 박막의 마찰계수와 내마모특성은 Pin-on-disk형 마찰시험기를 이용하여 상기의 증착조건과의 상관관계를 조사하였다. DC self-bais, 즉 충돌에너지가 커지면 박막의 증착속도와 경도는 대체로 증가하고, 박막내의 압축응력은 최대값을 가지다가 다시 감소됨을 알 수 있언ㅆ다. 또한 박막내의 수소량은 급격히 감소하다가 포화됨을 알 수 있었다. 얻어진 박막의 마찰계수는 최소 0.08로 분위기가 dry일 때 더 작으며 내마모성은 이온의 충돌에너지와 밀접한 관계를 가지며 모재인 Si-wafer보다 훨씬 큼을 알수 있었다.