PVD Coatings in the System Si-Al-O-N

Knotek, O.; Löffler, F.; Beele, W.

doi:10.4028/www.scientific.net/kem.89-91.275

Cited by 5 publications

(6 citation statements)

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“…Knotek 305 prepared ''superstoichiometric'' carbides, MC 1ϩx , by reactive sputtering which, in fact, consisted of nanocrystals of stoichiometric carbides imbedded in a a-C:H matrix. With increasing excess x of the carbon, the hardness of the films increases, reaches a maximum of about 40 GPa and, afterwards, decreases again upon a further increase of x in a similar manner as in nc-MnN/a-Si 3 N nanocomposites.…”

Section: Other Superhard Nanocompositesmentioning

confidence: 99%

The search for novel, superhard materials

Vepřek

1999

Journal of Vacuum Science &Amp; Technology A: Vacuum, Surfaces, and Films

1,144

261

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The recent development in the field of superhard materials with Vickers hardness of ⩾40 GPa is reviewed. Two basic approaches are outlined including the intrinsic superhard materials, such as diamond, cubic boron nitride, C3N4, carbonitrides, etc. and extrinsic, nanostructured materials for which superhardness is achieved by an appropriate design of their microstructure. The theoretically predicted high hardness of C3N4 has not been experimentally documented so far. Ceramics made of cubic boron nitride prepared at high pressure and temperature find many applications whereas thin films prepared by activated deposition from the gas phase are still in the stage of fundamental development. The greatest progress has been achieved in the field of nanostructured materials including superlattices and nanocomposites where superhardness of ⩾50 GPa was reported for several systems. More recently, nc-TiN/SiNx nanocomposites with hardness of 105 GPa were prepared, reaching the hardness of diamond. The principles of design for these materials are summarized and some unresolved questions outlined.

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Section: Other Superhard Nanocompositesmentioning

confidence: 99%

The search for novel, superhard materials

Vepřek

1999

Journal of Vacuum Science &Amp; Technology A: Vacuum, Surfaces, and Films

1,144

261

View full text Add to dashboard Cite

show abstract

“…Therefore, the first layer of the coating is the amorphous aluminium-silicon oxynitride. This compound possesses higher hardness as compared to conventional silicon nitride [43][44][45][46][47][48][49][50][51][52][53][54][55][56]. Products based on aluminium-silicon oxynitride are used in the conditions of high mechanical loads, thermal shock, aggressive chemical and abrasive media, which is conditioned by their high strength, chemical stability, corrosion and thermal stability.…”

Section: Resultsmentioning

confidence: 99%

Si-Al-N-O Multi-Layer Coatings with Increased Corrosion Resistance Deposited on Stainless Steel by Magnetron Sputtering

Dorofeeva

Gubaidulina

Сергеев

et al. 2022

Metals

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This work studies single-layer (Al-Si-N) and multi-layer (Al-Si-N-O/Al-Si-O) coatings deposited by magnetron sputtering on stainless steel specimens (AISI 321), which can be used under aggressive conditions. The multi-layer coating consists of six alternating layers of Al-Si-N-O and Al-Si-O with a thickness of 0.9 µm and 0.2 µm, respectively. The structural-phase state and the chemical composition of the coatings were studied by transmission and scanning electron microscopy and XPS analysis. It was revealed that single-layer coatings are nanocrystalline and contain AlN and α-Si3N4 phases. Multi-layer coatings (Al-Si-N-O/Al-Si-O) are amorphous in each of the layers. The corrosion properties of substrate and coated specimens were investigated using a potentiostat in the 3.5 mg/l sea salt solution. It was found that corrosion resistance of stainless steel specimens with multi-layer coating is substantially (tenfold) higher compared with substrates and the specimens with single-layer coating.

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“…During long-term service at high temperature atmosphere, the protection effect of MCrAlY coatings is impaired by elemental interdiffusion between the coatings and the substrate [4][5][6]. It is described that the interdiffusion accelerates the protective surface scales spalling and makes the continuous scales not regenerated because of the depletion of Cr and Al elements.…”

Section: Introductionmentioning

confidence: 96%

Microstructural characteristics and degradation mechanism of the NiCrAlY/CrN/DSM11 system during thermal exposure at 1100 °C

Sun

et al. 2010

Journal of Alloys and Compounds

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PVD Coatings in the System Si-Al-O-N

Cited by 5 publications

References 0 publications

The search for novel, superhard materials

The search for novel, superhard materials

Si-Al-N-O Multi-Layer Coatings with Increased Corrosion Resistance Deposited on Stainless Steel by Magnetron Sputtering

Microstructural characteristics and degradation mechanism of the NiCrAlY/CrN/DSM11 system during thermal exposure at 1100 °C

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