TiAlN/Cu Nanocomposite Coatings Deposited by Filtered Cathodic Arc Ion Plating

doi:.10.1016/j.jmst.2016.07.018

Abstract

Abstract:

TiAlN/Cu nanocomposite coatings with Cu concentration of 0-1.4at.% were deposited on the high-speed steel (HSS) substrates by filtered cathodic arc ion plating technique. The chemical composition, microstructure, morphology, adhesion strength, mechanical and tribological properties of the TiAlN/Cu coatings were characterized and analyzed. The results reveal that the coating structure and properties depend on not only the Cu concentration, but also the deposition condition. The addition of Cu significantly decreases the grain size and weakens the texture in the TiAlN/Cu coatings. With increasing the Cu concentration, the coating hardness decreases slightly from 30.7GPa of the pure TiAlN coating to 28.5GPa of the TiAlN/Cu coating with 1.4at.% Cu. All the TiAlN/Cu coatings present sufficient adhesion strength. In addition, the existing state of additive Cu in the TiAlN/Cu coatings is also investigated.

Key words: TiAlN, TiAlN/Cu, Nanocomposite coating, Filtered cathodic arc ion plating, Co-deposition

Chen Lei,Pei Zhiliang,Xiao Jinquan,Gong Jun,Sun Chao. TiAlN/Cu Nanocomposite Coatings Deposited by Filtered Cathodic Arc Ion Plating[J]. J. Mater. Sci. Technol., 2017, 33(1): 111-116.

Figures/Tables 10

Fig.1 Schematic diagram of filtered cathodic arc ion plating

Table 1 Deposition parameters of TiAlN/Cu coatings

Procedure	Substrate bias (V)	Working pressure (Pa)	Duration time (min)
Ion bombardment	-1000	0.3 (Ar)	5
Buffer layer 1	-600	0.3 (Ar)	3
Buffer layer 2	-200	0.3 (Ar)	3
TiAlN/Cu coating	-200	0.4 (N₂)	90

Table 2 Chemical composition of TiAlN/Cu coatings

Coating	Chemical composition (at.%)
Coating	Ti	Al	N	Cu
TiAlN	36.7±0.5	10.0±0.2	53.3±0.5	0
TiAlN/Cu	35.9±1.0	10.2±0.3	53.5±1.2	0.4±0.1
	35.4±0.5	10.7±0.1	53.1±0.4	0.8±0.2
	35.2±0.9	10.4±0.4	53.3±1.2	1.1±0.1
	34.8±0.4	10.8±0.2	53.0±0.4	1.4±0.1

Fig.32 XPS spectrum of Cu 2p of TiAlN/Cu coating with 1.4at.% Cu

Fig.3 Typical X-ray diffraction patterns of TiAlN and TiAlN/Cu coatings

Table 3 Mechanical properties, adhesion strength and friction coefficient of TiAlN/Cu coatings

Cu content (at.%)	Hardness (GPa)	Elastic modulus (GPa)	Scratch test L_c (N)	Rockwell-C test (HF1 - 6)	Friction coefficient
0	30.7±0.4	382.1±9.1	79.3±1.9	HF2	0.35
0.4	29.3±0.4	347.4±6.3	69.7±1.3	HF2	0.75
0.8	29.3±0.3	338.2±4.6	66.3±0.9	HF2	0.27
1.1	28.7±0.3	323.3±6.4	62.7±2.8	HF2	0.75
1.4	28.5±0.3	321.9±5.5	60.7±3.4	HF2	0.41

Fig.4 Cross-sectional morphologies of TiAlN and TiAlN/Cu coatings: (a) TiAlN, (b) TiAlN/0.8at.% Cu, (c) TiAlN/1.4at.% Cus

Fig.5 Plane-view TEM micrographs of TiAlN and TiAlN/Cu coatings: (a) TiAlN, (b) TiAlN/0.8at.% Cu

Fig.6 Scratch tracks for TiAlN and TiAlN/Cu coatings: (a) TiAlN, (b) TiAlN/0.8at.% Cu, (c) TiAlN/1.4at.% Cu

Fig.7 Indentations produced by Rockwell-C test for TiAlN and TiAlN/Cu coatings: (a) TiAlN, (b) TiAlN/0.4at.% Cu, (c) TiAlN/0.8at.% Cu, (d) TiAlN/1.4at.% Cu

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