Effect of Preliminary Irradiation of 321 Steel Substrates with High-Intense Pulsed Ion Beams on Scratch Test Results of Subsequently Deposited AlN Coatings

The paper presents the effect of irradiation of 321 steel substrates with a high-intense pulsed ion beam (HIPIB) on changes in functional properties of the surface layers and tribological characteristics of AlN coatings subsequently deposited above by the reactive magnetron sputtering method. The morphology of the modified surface layers, their microhardness and free surface energy levels are presented for different HIPIB energy densities. HIPIB irradiation of the substrates caused variations in the results of scratch tests combined with the acoustic emission signal processing. Their analysis has enabled concluding that the crack initiation threshold could be at least doubled for the studied coating/substrate system due to preliminary HIPIB irradiation. Finally, the obtained data were discussed, and future research directions were proposed.

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Tribological Properties of Magnetron Sputtered Amorphous Silicon Carbide and Silicon Carbonitride Coatings

Defect and Diffusion Forum ◽

10.4028/www.scientific.net/ddf.368.91 ◽

2016 ◽

Vol 368 ◽

pp. 91-94 ◽

Cited By ~ 2

Author(s):

Jan Tomastik ◽

Radim Čtvrtlík

Keyword(s):

Silicon Carbide ◽

Acoustic Emission ◽

Amorphous Silicon ◽

Tribological Properties ◽

Scratch Test ◽

Silicon Carbonitride ◽

Amorphous Silicon Carbide ◽

Emission Signal ◽

Temperature Exposure ◽

Scratch Tests

The tribological properties of magnetron sputtered amorphous silicon carbide (a-SiC) and silicon carbonitride coatings (a-SiCN) with thickness of 2.2 and 3.4 µm were investigated. Samples were additionally annealed at temperature of 700°C or 900°C in air. Progressive load scratch tests were performed on the annealed samples as well as on the as deposited ones. An acoustic emission signal was detected during all tests using the sample holder with embedded sensor of our own design. Results indicate no change in wear resistance of SiCN sample after high temperature exposure up to 900°C, unlike in the tests of SiC coatings. Detection of acoustic emission generated during the scratch test proved to be a significant improvement for the coating evaluation.

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Formation of New Surface Layers on Ceramics by Ion Assisted Reaction

Journal of Materials Research ◽

10.1557/jmr.1998.0357 ◽

1998 ◽

Vol 13 (9) ◽

pp. 2560-2564 ◽

Cited By ~ 3

Author(s):

S. K. Koh ◽

Y-B. Son ◽

J-S. Gam ◽

K-S. Han ◽

W. K. Choi ◽

...

Keyword(s):

Bond Strength ◽

Bending Strength ◽

Profile Analysis ◽

Ion Beam ◽

Scratch Test ◽

Nitride Layer ◽

Ion Beam Sputtering ◽

Surface Layers ◽

Cu Films ◽

Beam Sputtering

Ar+ ions with 1 keV energy were irradiated on aluminum nitride in an O2 environment and on aluminum oxide in a N2 environment. AlON on AlN and AlN on Al2O3 are formed by the Ar1 irradiation in O2 gas and N2 gas environments, respectively, and the formation of new surface layers is confirmed on the basis of Al2p near core levels and O1s, N1s core levels XPS depth profile analysis. Cu(1000 Å) films were deposited by ion-beam sputtering on Ar+ irradiated/unirradiated AlN surfaces, and the change of the adhesion strength was investigated by a scratch test. Cu films deposited on the irradiated AlN under an O2 environment showed higher bond strength than that on the unirradiated AlN. The improvement of bond strength of Cu films on the AlN surface resulted from the interface bonds between Cu and the surface layers. The bending strength of polycrystalline Al2O3 irradiated by Ar+ ions in N2 environment was also increased and the formation of nitride layer on the alumina was confirmed. A possible new surface layer formation mechanism on ceramics by the ion assisted reaction has been discussed in terms of surface analysis, chemical bond, and mechanical strength.

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Innovative Coatings Based on Peppermint Essential Oil on Titanium and Steel Substrates: Chemical and Mechanical Protection Ability

Materials ◽

10.3390/ma13030516 ◽

2020 ◽

Vol 13 (3) ◽

pp. 516 ◽

Cited By ~ 1

Author(s):

Martina Cazzola ◽

Sara Ferraris ◽

Giuliana Banche ◽

Giovanna Gautier Di Confiengo ◽

Francesco Geobaldo ◽

...

Keyword(s):

Essential Oil ◽

Surface Damage ◽

Scratch Test ◽

Alkaline Solutions ◽

Substrate Roughness ◽

Mechanical Adhesion ◽

Before And After ◽

Water Media ◽

Scratch Tests ◽

Steel Substrates

A coating that was made of peppermint essential oil was obtained on different metal substrates: Ti6Al4V alloy (mechanically polished and chemically etched) and 316L stainless steel (mechanically polished and mechanically ground). The final aim is to get a multifunctional (chemical and mechanical) protection of metal surfaces in contact with water media. The coatings were characterized by means of fluorescence microscopy, contact angle measurements, and Fourier Transformed Infrared spectroscopy (FTIR) spectroscopy. The chemical stability of the coatings was tested by means of soaking in water for different times (up to seven days) and washing with different alkaline or acidic solutions. The mechanical adhesion of the coating was tested by tape adhesion test (before and after soaking) and scratch tests to verify whether it has protection ability with respect to the metal substrate. All of the performed characterizations show that the coatings are chemically stable on all of the substrates and are nor dissolved or removed by water during soaking or by alkaline solutions during washing. The adhesion is high and classified as 4B or 5B (on the chemically etched or mechanically ground substrates) according to ASTM D3359-97, depending on the substrate roughness, both before and after soaking. In the case of scratch test (up to 10 N), the coating is not removed and it has a protection action that is able to avoid the surface damage, even if the substrate has a plastic deformation.

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