EFFECTS OF NITROGEN FLOW RATE AND POST-HEAT TREATMENT ON PREPARATION OF Ti2AlN COATINGS BY AIP

J Chin Soc Corr Pro

2012, Vol. 32

Issue (1): 1-6 DOI:

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EFFECTS OF NITROGEN FLOW RATE AND POST-HEAT TREATMENT ON PREPARATION OF Ti₂AlN COATINGS BY AIP

YANG Ying¹, DONG Yuliang¹, GAO Lijun¹, GONG Jun¹, JIANG Xin², SUN Chao¹

1. State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016
2. Institute of Materials Engineering, University of Siegen, Paul-Bonatz-Str.9-11, Siegen 57076, Germany

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Abstract In the present work, Ti-Al-N coatings were deposited on 1Cr18Ni9Ti substrates at a low synthesis temperature using arc ion plating(AIP). The effects of nitrogen flow rate and post-heat treatment on the microstructure of the coatings were investigated. The results show that no Ti₂AlN phase forms in all the as-deposited coatings. The coatings are possibly composed of Ti₃AlN inverse perovskite phase, TiN, α-Ti, fcc-Al and Ti_xAl_y intermetallic phase. Ti₂AlN phase can be detected in the annealed coatings in a given condition. It has been found that the nitrogen concentration in the coatings and the annealing temperature play a key role in the phase formation. The formation of Ti₂AlN phase is suppressed by the increment of nitrogen concentration and promoted by the enhancement of annealing temperature. TEM results indicate that the formation of Ti₂AlN phase is accompanied by the microstructure evolution from strong layered structure to fine equiaxed crystals in the process of heat treatment.

Key words: arc ion plating Ti-Al-N coatings Ti₂AlN MAX phase microstructure

Received: 04 November 2010

ZTFLH:

TG178

Corresponding Authors: SUN Chao E-mail: csun@imr.ac.cn

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YANG Ying, DONG Yuliang, GAO Lijun, GONG Jun, JIANG Xin, SUN Chao. EFFECTS OF NITROGEN FLOW RATE AND POST-HEAT TREATMENT ON PREPARATION OF Ti₂AlN COATINGS BY AIP. J Chin Soc Corr Pro, 2012, 32(1): 1-6.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2012/V32/I1/1

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