Abrasive wear of texture-controlled CVD α-Al2O3 coatings

Fallqvist, Mikael; Olsson, Mikael; Ruppi, S.

doi:10.1016/j.surfcoat.2007.06.063

Cited by 34 publications

(10 citation statements)

References 15 publications

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“…[2][3][4] The thermodynamically stable corundum (α)-phase has been of primary interest, and the latest increase in tool life performance from α-Al2O3 coatings, comes from the introduction of highly (0001) textured α-Al2O3. 5,6 These CVD coatings are, however, limited by their inherent problem of cracking upon cooling due to differences in thermal expansion between coating and substrate and the tensile stresses formed in the film. 6 To address these challenges, physical vapor deposition (PVD) techniques, such as DC arc, 7 -9 pulsed DC arc 10 and different types of sputtering techniques 11 -17 have been used at lower deposition temperatures than CVD.…”

Section: Introductionmentioning

confidence: 99%

Effect of Si on DC arc plasma generation from Al-Cr and Al-Cr-Si cathodes used in oxygen

Zhirkov

Landälv

Göthelid

et al. 2017

Journal of Applied Physics

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Al2O3 alloyed with Cr is an important material for the tooling industry. It can be synthesized from an arc discharge using Al-Cr cathodes in an oxygen atmosphere. Due to formation of Al-rich oxide islands on the cathode surface, the arc process stability is highly sensitive to the oxygen pressure. For improved stability, the use of Al0.70Cr0.25Si0.05 cathodes has previously been suggested, where Si may reduce island formation. Here, we have investigated the effect of Si by comparing plasma generation and thin film deposition from Al0.7Cr0.3 and Al0.7Cr0.25Si0.05 cathodes. Plasma ion composition, ion energies, ion charge states, neutral species, droplet formation and film composition have been characterized at different O2 flow rate for arc currents of 60 and 90 A. Si and related compounds are detected in plasma ions and in plasma neutrals. Scanning electron microscopy and energy dispersive X-ray analysis show that the cathode composition and the film composition are the same, with Si present in droplets as well. The effect of Si on the process stability, ion energies, and ion charge states is found to be negligible compared to that of the arc current. The latter is identified as the most relevant parameter for tuning the properties of the reactive discharge. The present work increases the fundamental a Corresponding author: igozh@ifm.liu.se, phone +46 730 52 10 12, fax +46 13 137568 2 understanding of plasma generation in a reactive atmosphere, and provides input for the choice of cathode composition and process parameters in reactive DC arc synthesis.

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Section: Introductionmentioning

confidence: 99%

Effect of Si on DC arc plasma generation from Al-Cr and Al-Cr-Si cathodes used in oxygen

Zhirkov

Landälv

Göthelid

et al. 2017

Journal of Applied Physics

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“…Researchers have conducted many studies on ceramic coatings [6][7][8][9][10]. Yet very little information has been reported on the effect of abrasive grain size on the materials with Al 2 O 3 .…”

Section: Introductionmentioning

confidence: 99%

Effect of abrasive particle sizes on abrasive wear of ceramic coatings sprayed by plasma process

Gök

Gençel

Koç

et al. 2011

Powder Metall Met Ceram

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This study examines the effects of abrasive grain size on abrasive wear behaviors on surfaces coated with different types of ceramics. To this end, the surface of AISI 1040 steel is coated with the ceramic materials of 5% SiO 2 -3% TiO 2 -92% Cr 2 O 3 , 60% Al 2 O 3 -40% TiO 2 , pure Al 2 O 3 and 87% Al 2 O 3 -13% TiO 2 using the plasma method. Following the coating process, the abrasive wear resistance of each sample is tested by the ring-on-disc method. 80-220 mesh SiC abrasive paper is used as abrasive. The best wear resistance is obtained with the ceramic coating containing 92% Cr 2 O 3 , which is followed by pure Al 2 O 3 and 87% Al 2 O 3 -13% TiO 2 , respectively. The lowest wear resistance is observed in 60% Al 2 O 3 -40% TiO 2 ceramic coating. Wear resistance of the samples increases with increasing hardness value and decreasing abrasive grain size. It is observed that wear mechanisms occurring on the samples' wear surfaces change with changing abrasive grain size. Wear mechanisms such as microscratching, microcracking, and plastic deformation are observed in the samples.

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“…Ruppi et al prepared (0 1 2), (1 0 4), (0 0 1)-oriented ␣-Al 2 O 3 films on Ti(C, O) and Ti(C, N) intermediate layers deposited on WC-Co substrate and reported that the films with (0 0 6) and (1 0 4) orientations showed higher hardness and modulus than those with random or the other orientations [4,[7][8][9]. It is commonly understood that the crystal orientation depends not only on the substrate but also on the deposition temperature and the total pressure in the CVD process.…”

Section: Introductionmentioning

confidence: 99%

Texture and orientation characteristics of α-Al2O3 films prepared by laser chemical vapor deposition using Nd:YAG laser

Ito

Kadokura

Kimura

et al. 2010

Journal of Alloys and Compounds

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Abrasive wear of texture-controlled CVD α-Al2O3 coatings

Cited by 34 publications

References 15 publications

Effect of Si on DC arc plasma generation from Al-Cr and Al-Cr-Si cathodes used in oxygen

Effect of Si on DC arc plasma generation from Al-Cr and Al-Cr-Si cathodes used in oxygen

Effect of abrasive particle sizes on abrasive wear of ceramic coatings sprayed by plasma process

Texture and orientation characteristics of α-Al2O3 films prepared by laser chemical vapor deposition using Nd:YAG laser

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