Cubic Aluminum Nitride Coating Through Atmospheric Reactive Plasma Nitriding

This research studies the properties of plasma-nitride coating on AISI D2 tool steels prepared by non-directional grinding at various finishing. In the manufacturing process, the AISI D2 was machined to size and hardened with a typical hardening process. In addition, its surface was treated with plasma nitriding. Various levels of roughness were produced as well as possible affects on the nitride coating properties. In this study, the following five conditions of grinding were performed on the hardened specimens: 1-µm diamond particle and four SiC grinding papers: P100, P240, P800, and P2500. The surface finishing with at least 0.023-µm roughness value (P800 grinding) provided a plasma-nitride layer with a moderately good hardness profile and a thick nitride layer compared with other finer finishing. This finishing process was also more economical requiring less time and manpower to create than others. Overall, this study suggests that finer surface finishing has a tendency to significantly improve the tool steels hardness profile and hardened depth.

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Cubic Aluminum Nitride Transformed Under Reduced Pressure Using Aerosol Deposition Method

Journal of the American Ceramic Society ◽

10.1111/j.1551-2916.2005.00215.x ◽

2005 ◽

Vol 88 (4) ◽

pp. 1067-1069 ◽

Cited By ~ 21

Author(s):

Atsushi Iwata ◽

Jun Akedo ◽

Maxim Lebedev

Keyword(s):

Aluminum Nitride ◽

Aerosol Deposition ◽

Deposition Method ◽

Reduced Pressure ◽

Aerosol Deposition Method ◽

Cubic Aluminum Nitride

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A Two-Stage Route to Coaxial Cubic-Aluminum-Nitride–Boron- Nitride Composite Nanotubes

Advanced Materials ◽

10.1002/adma.200306571 ◽

2004 ◽

Vol 16 (11) ◽

pp. 929-933 ◽

Cited By ~ 60

Author(s):

L.-W. Yin ◽

Y. Bando ◽

Y.-C. Zhu ◽

D. Golberg ◽

M.-S. Li

Keyword(s):

Boron Nitride ◽

Aluminum Nitride ◽

Two Stage ◽

Composite Nanotubes ◽

Cubic Aluminum Nitride

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Fabrication of Aluminum Nitride Coatings by Reactive Plasma Spraying and Evaluation of Its Property

Shinku ◽

10.3131/jvsj.50.458 ◽

2007 ◽

Vol 50 (6) ◽

pp. 458-461 ◽

Cited By ~ 2

Author(s):

Motohiro YAMADA ◽

ChaeChul LEE ◽

Toshiaki YASUI ◽

Masahiro FUKUMOTO ◽

Koyata TAKAHASHI

Keyword(s):

Aluminum Nitride ◽

Plasma Spraying ◽

Reactive Plasma Spraying ◽

Reactive Plasma ◽

Nitride Coatings

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Fabrication of AlN/Al2O3 Coatings via Atmospheric Reactive Plasma Nitriding of Al2O3 Powders

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.484.166 ◽

2011 ◽

Vol 484 ◽

pp. 166-171 ◽

Cited By ~ 6

Author(s):

Mohammed Shahien ◽

Motohiro Yamada ◽

Toshiaki Yasui ◽

Masahiro Fukumoto

Keyword(s):

Thermal Conductivity ◽

Plasma Nitriding ◽

Substrate Surface ◽

Atmospheric Plasma ◽

Aluminum Oxynitride ◽

Spray Distance ◽

Quenching Rate ◽

Plasma Flame ◽

Cubic Symmetry ◽

Reactive Plasma

Plasma sprayed alumina (Al2O3) coatings has showed a great effect in service the life of engineering tools, while its low thermal conductivity limits its application in heat exchange applications. Aluminum nitride (AlN) is a promising material to improve the thermal conductivity of Al2O3 coatings. This paper proposed a new way to fabricate AlN/Al2O3 coatings through reactive plasma nitriding of Al2O3 powders. It was possible to fabricate cubic-AlN/Al2O3 coatings by spraying Al2O3 powders in atmospheric plasma spray process (APS). During plasma Al2O3 powder reacted in high temperature N2/H2 plasma to form aluminum oxynitride and it easily nitride to produce the cubic AlN phase. Thus, both of Al5O6N and c-AlN phrases have the same cubic symmetry (cubic and closely packed crystal structure). Then, the particles collide, flatten, and rapidly　solidified on substrate surface. The high quenching rate of the plasma flame prevents the crystal growth and formation of hexagonal AlN phase. The fabricated coatings consist of c-AlN, α-Al2O3, Al5O6N and γ-Al2O3. The AlN content was improved with increasing the flight time (spray distance) due to increasing the reaction time between Al2O3 particles and the surrounding N2 plasma. It was possible to fabricate AlN/Al2O3 coating consist of 97 wt. % of AlN phase at the spray distance of 300 mm.

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