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MODIFICATION OF STRESS DISTRIBUTION ALONG THE THICKNESS OF (Ti, Al)N COATINGS AND PREPARATION OF THE COATINGS WITH LARGE THICKNESS |
ZHAO Shengsheng1), CHENG Yu1), CHANG Zhengkai2), WANG Tiegang2), SUN Chao2) |
1) Shenzhen Polytechnic, Shenzhen 518055
2) Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016 |
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Cite this article:
ZHAO Shengsheng CHENG Yu CHANG Zhengkai WANG Tiegang SUN Chao. MODIFICATION OF STRESS DISTRIBUTION ALONG THE THICKNESS OF (Ti, Al)N COATINGS AND PREPARATION OF THE COATINGS WITH LARGE THICKNESS. Acta Metall Sin, 2012, 48(3): 277-282.
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Abstract The effects of N2 partial pressure on the depth distribution
of residual stresses and mechanical properties in the (Ti, Al)N coatings
prepared by arc ion plating (AIP), were investigated. The results indicate
that the stress distribution was roughly uniform when the coatings were
deposited under lower NN2 partial pressure. As the partial pressure
increased the stress distribution to exhibited a “bell” shape and the
average stresses of coatings increased remarkably. The mechanism of
stress distribution was analyzed by characterizing the microstructure and
the composition of the coating. The N2 partial pressure also affected the
hardness of coatings and the coating/substrate adhesion obviously. The
higher the N2 partial pressure is, the higher the coating hardness but
the lower the adhesion. The stress distribution can be modified and the
adhesion of the coating/substrate can be improved by optimizing N2 partial
pressure parameter. Finally, the coatings with the thickness over 130 μm
were successfully directly deposited on the substrate through optimizing
the N2 partial pressure.
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Received: 08 August 2011
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Fund: Supported by National Natural Science Foundation of China (No.50471072) and Guangdong Natural Science Foundation (No.S2011040004468}) |
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