Cubic Aluminum Nitride Coating Through Atmospheric Reactive Plasma Nitriding

Shahien, Mohammed; Yamada, Motohiro; Yasui, Toshiaki; Fukumoto, Masahiro

doi:10.1007/s11666-010-9469-0

Cited by 30 publications

(19 citation statements)

References 46 publications

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“…Furthermore, a new c-AlN phase (Zinc-blend phase) was detected in the XRD spectra after using the AlN additive. The zinc-blend phase did not appear during the reactive plasma nitriding of only Al powder as shown in our previous studies [15][16][17][18] and in Figure 2. Some oxides like aluminum oxynitrides (Al 5 O 6 N) and Al 2 O 3 (which appeared during the nitriding of Al powder) were detected in the XRD spectra.…”

Section: Spraying Of Wet-mixed Al/aln Powderssupporting

confidence: 61%

“…The nitrogen reacts intensely with the liquid metallic particles and the nitriding reaction occurs via three steps as clarified in more detail in our previous studies [17,18]: nitridation at the surface of the particles with the formation of a crystalline AlN shell, breakaway or outflow of molten or vaporized Al core, and volume nitridation outside the shell with a remaining hole or an empty core. Thus, under high-temperature conditions, above the Al melting point (660 °C), Al particles melt, followed by coalescence into a ball-like form due to surface tension.…”

Section: Discussionmentioning

confidence: 94%

“…The principle of RPS is based on a reaction between the feedstock powder and surrounding reactive gaseous species present in the plasma. In our previous studies [15][16][17][18], it was possible to fabricate cubic aluminum nitride (c-AlN)/Al composite coatings through reactive plasma spraying of Al feedstock powder in N 2 /H 2 plasma using a conventional atmospheric plasma spray system.…”

Section: Introductionmentioning

confidence: 99%

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In Situ Fabrication of AlN Coating by Reactive Plasma Spraying of Al/AlN Powder

et al. 2011

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Abstract:Reactive plasma spraying is a promising technology for the in situ formation of aluminum nitride (AlN) coatings. Recently, it became possible to fabricate cubic-AlN-(c-AlN) based coatings through reactive plasma spraying of Al powder in an ambient atmosphere. However, it was difficult to fabricate a coating with high AlN content and suitable thickness due to the coalescence of the Al particles. In this study, the influence of using AlN additive (h-AlN) to increase the AlN content of the coating and improve the reaction process was investigated. The simple mixing of Al and AlN powders was not suitable for fabricating AlN coatings through reactive plasma spraying. However, it was possible to prepare a homogenously mixed, agglomerated and dispersed Al/AlN mixture (which enabled in-flight interaction between the powder and the surrounding plasma) by wet-mixing in a planetary mill. Increasing the AlN content in the mixture prevented coalescence and increased the nitride content gradually. Using 30 to 40 wt% AlN was sufficient to fabricate a thick (more than 200 µm) AlN coating with high hardness (approximately 1000 Hv). The AlN additive prevented the coalescence of Al metal and enhanced post-deposition nitriding through N 2 plasma irradiation by allowing the nitriding species in the plasma to impinge on a larger Al surface area. Using AlN as a feedstock additive was found to be a suitable method for fabricating AlN coatings by reactive plasma

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Section: Spraying Of Wet-mixed Al/aln Powderssupporting

confidence: 61%

Section: Discussionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

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In Situ Fabrication of AlN Coating by Reactive Plasma Spraying of Al/AlN Powder

et al. 2011

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“…Reactive thermal spraying is an effective way to prepare in situ composite coatings with good toughness and wear resistance (Ref [3][4][5]. During reactive spraying, hard ceramic phases (such as oxides, carbides, nitrides, and borides) can be formed in situ by the reactions between feedstock materials or between feedstock materials and surrounding reactive gases (Ref [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Microstructure Characterization of the FeAl2O4-Based Nanostructured Composite Coating Synthesized by Plasma Spraying Fe2O3/Al Powders

et al. 2011

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The microstructure of the coating prepared by reactive plasma spraying Fe 2 O 3 /Al composite powders was characterized by x-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The results indicated that the coating exhibited nanostructured microstructure which consisted of FeAl 2 O 4 , Fe or Fe solid solution, Al 2 O 3 and a little FeAl. In the composite coating, spherical Fe particles (tens of nanometers to hundreds of nanometers) were distributed uniformly within the equiaxed and columnar nanograins FeAl 2 O 4 matrix. There were two kinds of Al 2 O 3 phases present in the composite coating. One kind was nano-sized Al 2 O 3 particles uniformly dispersed within the matrix, forming eutectic structure of (FeAl 2 O 4 + c-Al 2 O 3 ); the other was 1-1.5 lm Al 2 O 3 particles embedded individually within the matrix. The composite coating had higher toughness than the conventional microstructured Al 2 O 3 coating.

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“…However, the synthesis of c-AlN is more tricky than α-AlN 11,12 . Owing to fabrication difficulties of such films and experimental verifications, applications to industrial devices have poorly been implemented yet.…”

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confidence: 99%

Structural and Mechanical Properties of Radiofrequency Ar-N2 Plasma Nitrided Aluminium

Hassan

Qayyum²,

Ahmad³

et al. 2015

Mat. Res.

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Aluminium (Al) samples were nitrided in 13.56 MHz radiofrequency (RF) discharge of 70:30 vol.% Ar:N 2 mixture at substrate temperature of 400 °C and RF power of 300 W for different fill pressures and treatment times. The nitrided samples were then characterized for their structural and mechanical properties using x-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive x-ray spectroscopy (EDS), and Vickers micro hardness testing. XRD peaks (110), (111) and (200) of aluminium nitride (AlN) and their downshift confirmed the nitride formation together with nitrogen diffusion. The metastable cubic phase (c-AlN) shows texture growth and re-orientation dependent on fill pressure and treatment time. SEM micrographs showed the surface morphology with micro-pores. EDS results showed that the nitrogen content was significantly increased with nitriding time, along with the removal of oxides. Vickers hardness of the Al surface was increased more than thrice for 30 hours nitriding.

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Cubic Aluminum Nitride Coating Through Atmospheric Reactive Plasma Nitriding

Cited by 30 publications

References 46 publications

In Situ Fabrication of AlN Coating by Reactive Plasma Spraying of Al/AlN Powder

In Situ Fabrication of AlN Coating by Reactive Plasma Spraying of Al/AlN Powder

Microstructure Characterization of the FeAl2O4-Based Nanostructured Composite Coating Synthesized by Plasma Spraying Fe2O3/Al Powders

Structural and Mechanical Properties of Radiofrequency Ar-N2 Plasma Nitrided Aluminium

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