Tribological behavior of jaspilite evaluated by micro-scratch test

The tribological behavior of Ni-based WC-Co coatings is analyzed. The coatings were deposited on gray cast iron substrates in a spray and fuse process using SuperJet Eutalloy deposition equipment, varying the oxygen flow conditions in the flame. The crystallographic structure of the coatings was characterized via the X-ray diffraction (XRD) technique. The microhardness was measured on the surface and in cross sections of the coatings by means of a Knoop microhardness tester. The topography and the morphological characteristics of the coatings and the tribo-surfaces were examined using scanning electron microscopy (SEM) and confocal microscopy, while the chemical composition was measured by means of energy-dispersive X-ray spectroscopy (EDS). The tribological behavior of the coatings was examined via a cohesion-adhesion scratch test, using cross sections of the coatings. Furthermore, two wear tests were carried out, using the pin-on-disk method under ASTM G99 standard and an ASTM standard G65 sand/rubber wheel abrasion wear test. The wear of the coatings showed a close relationship to the porosity in the metal matrix; since then, in the abrasive wear test, a high porosity is related with lower hardness in the coatings; likewise, a low hardness is related with a high wear.

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Deformation mechanism and tribological behavior of hydrogen-free carburized layer on Ti-6Al-4V alloy

Industrial Lubrication and Tribology ◽

10.1108/ilt-11-2019-0489 ◽

2020 ◽

Vol ahead-of-print (ahead-of-print) ◽

Author(s):

Tian Tian ◽

Ruibo Zhao ◽

Dongbo Wei ◽

Kai Yang ◽

Pingze Zhang

Keyword(s):

Peer Review ◽

Deformation Mechanism ◽

Tribological Behavior ◽

Scratch Test ◽

Hardness Profile ◽

Cross Sectional ◽

Content Type ◽

Elastic Plastic ◽

The Coefficient Of Friction ◽

Carburized Layer

Purpose The purpose of this paper is to expound the relationship among microstructure, mechanical property, tribological behavior and deformation mechanism of carburized layer deposited on Ti-6Al-4V alloy by double-glow plasma hydrogen-free carburizing surface technology. Design/methodology/approach Morphologies and phase compositions of the carburized layer were observed by scanning electron microscope and X-ray diffraction. The micro-hardness tests were used to evaluate the surface and cross-sectional hardness of carburized layer. The reciprocating friction and wear experiments under various load conditions were implemented to investigate the tribological behavior of carburized layer. Moreover, scratch test with ramped loading pattern was carried out to illuminate the deformation mechanism of carburized layer. Findings Compared to substrate, the hardness of surface improved to ∼1,100 HV0.1, while the hardness profile of carburized layer presented gradual decrease from ∼1,100 to ∼300 HV0.1 within the distance of the total carburizing-affected region about 30 µm. The coefficient of friction, wear rate and wear morphology of carburized layer were analyzed. Scratch test indicated that the deformation process of carburized layer could be classified into three mechanisms (elastic, changing elastic–plastic and stable elastic–plastic mechanisms), and the deformation transition of the carburizing-affected region was from changing elastic–plastic to elastic mechanisms. Both the elastic and changing elastic–plastic mechanisms are conducive to the wearing course. Originality/value Using this technology, hydrogen embrittlement was avoided and wear resistance property of titanium alloy was greatly improved. Simultaneously, the constitutive relation during the whole loading process was deduced in terms of scratch approach, and the deformation mechanism of carburized layer was discussed from a novel viewpoint. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-11-2019-0489/

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Tribological Behavior of Ti2AlNb Alloy by Surface Plasmas Carburized

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.482-484.914 ◽

2012 ◽

Vol 482-484 ◽

pp. 914-918

Author(s):

Dan Yang Zhu ◽

Wen Ping Liang ◽

Qiang Miao ◽

Kai Guo ◽

Long Li

Keyword(s):

Tribological Behavior ◽

Wear Test ◽

Scratch Test ◽

Alloy Layer ◽

Micro Hardness ◽

Surface Plasmas ◽

Glow Plasma ◽

Orthorhombic Alloy ◽

Plasma Carburizing ◽

Better Than

In order to improve the wear resistance of Ti2AlNb orthorhombic alloy, the carburized coating has been successfully prepared on Ti2AlNb alloy by double glow plasma technology. The microstructure, chemical composition and phase structure o f the carburized coating were analyzed by means of SEM, EDS and XRD. The Micro hardness of the alloy layer was measured, and the bond strength of carburized coating with substrate was also evaluated by scratch test. The tribological behaviors of layer were investigated by friction-wear test. The results show that a carburized layer is formed which is about 40μm and the content of C gradient decrease after double glow plasma carburizing, the Micro hardness of the layer is 1051 HV0.1 and the bond of the coating is 62N, the tribological behavior of layer is much better than matrix.

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A Comparative Study in the Tribological Behavior of DLC Coatings Deposited by HiPIMS Technology with Positive Pulses

Metals ◽

10.3390/met10020174 ◽

2020 ◽

Vol 10 (2) ◽

pp. 174 ◽

Cited By ~ 2

Author(s):

Jose A. García ◽

Pedro J. Rivero ◽

Eneko Barba ◽

Ivan Fernández ◽

Jose A. Santiago ◽

...

Keyword(s):

Wear Resistance ◽

Tribological Behavior ◽

High Hardness ◽

Scratch Test ◽

Low Friction ◽

Dlc Coatings ◽

Useful Life ◽

Scratch Tests ◽

Deposition Techniques

During the last few decades, diamond-like carbon (DLC) coatings were widely used for tribological applications, being an effective tool for improving the performance and the useful life of different machining tools. Despite its excellent properties, among which stand out a high hardness, a very low friction coefficient, and even an excellent wear resistance, one of the main drawbacks which limits its corresponding industrial applicability is the resultant adhesion in comparison with other commercially available deposition techniques. In this work, it is reported the tribological results of a scratch test, wear resistance, and nanoindentation of ta-C and WC:C DLC coatings deposited by means of a novel high-power impulse magnetron sputtering (HiPIMS) technology with “positive pulses”. The coatings were deposited on 1.2379 tool steel which is of a high interest due to its great and wide industrial applicability. Finally, experimental results showed a considerable improvement in the tribological properties such as wear resistance and adhesion of both types of DLC coatings. In addition, it was also observed that the role of doping with W enables a significant enhancement on the adhesion for extremely high critical loads in the scratch tests.

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The Correlation of Adhesion Strength with Barrier Structure in Cu Metallization

MRS Proceedings ◽

10.1557/proc-766-e.3.5 ◽

2003 ◽

Vol 766 ◽

Author(s):

A. Sekiguchi ◽

J. Koike ◽

K. Ueoka ◽

J. Ye ◽

H. Okamura ◽

...

Keyword(s):

Thin Films ◽

Adhesion Strength ◽

Nitrogen Concentration ◽

Scratch Test ◽

Barrier Structure ◽

Barrier Layers ◽

Cu Metallization ◽

Microstructure Observation ◽

Sputter Deposited ◽

Sulfur Containing

AbstractAdhesion strength in sputter-deposited Cu thin films on various types of barrier layers was investigated by scratch test. The barrier layers were Ta1-xNx with varied nitrogen concentration of 0, 0.2, 0.3, and 0.5. Microstructure observation by TEM indicated that each layer consists of mixed phases of β;-Ta, bcc-TaN0.1, hexagonal-TaN, and fcc-TaN, depending on the nitrogen concentration. A sulfur- containing amorphous phase was also present discontinuously at the Cu/barrier interfaces in all samples. Scratch test showed that delamination occurred at the Cu/barrier interface and that the overall adhesion strength increased with increasing the nitrogen concentration. A good correlation was found between the measured adhesion strength and the composing phases in the barrier layer.

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MACHINERY OPERATIONAL PROPERTY CONTROL DURING DIAMOND-ABRASIVE FINISHING USING ACTIVE SOTS

Bulletin of Bryansk state technical university ◽

10.30987/1999-8775-2020-9-13-17 ◽

2020 ◽

Vol 2020 (9) ◽

pp. 13-17

Author(s):

Yuriy Ryzhov ◽

Svetlana Abramova

Keyword(s):

Corrosion Inhibitors ◽

Tribological Behavior ◽

Surface Layers ◽

Physical Chemical ◽

Abrasive Finishing ◽

Alloying Additives ◽

Phosphorus Containing ◽

Micro Emulsion ◽

Property Control ◽

Diamond Abrasive

There is carried out a number of experiments with the purpose of analyzing SOTS impact upon both finishing productivity, and physical-chemical state and tribological behavior of surfaces machined, and also a possibility for creation according to the results of the investigations carried out a relatively universal micro-emulsion SOTS based on existing in the Ukraine the line of oils, PAV, corrosion inhibitors, alloying additives etc. As SOTS samples there were used both well-known compouds, for example, Camix, Nope Right (USA), and carbamide having in its structure boron, boron-phosphorus-containing additive, water-solvable phosphate, tributyl phosphate (oil-solvable), concentrate SOTS tribol, having in its structure compounds of boron, nitrogen and phosphorous; ethylic ether of fatty acids; methyl ether of colza oil; Sarkozyl-O having in its structure easily-decomposable chlorine compounds. From the results obtained it is possible to draw a conclusion that during finishing in the environment of water-compatible SOTS an important role in the formation of the properties of the surface worked is played by hydrocarbon components and additives which contribute to the formation of the thinnest surface layers modified with carbon and oxygen.

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