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Acta Metall Sin  2011, Vol. 47 Issue (3): 327-332    DOI: 10.3724/SP.J.1037.2010.00585
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PREPARATION AND PROPERTIES OF HIGH TEMPERATURE SELF LUBRICATING COATINGS BY INDUCTION SINTERING
XIAO Ling1, DING Chunhua1,SUN Yanhua2, YU Lie2
1.MOE Key Laboratory for Strength and Vibration, School of Aerospace, Xi’an Jiaotong Uuniversity, Xi’an 710049
2.School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710049
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XIAO Ling DING Chunhua SUN Yanhua YU Lie. PREPARATION AND PROPERTIES OF HIGH TEMPERATURE SELF LUBRICATING COATINGS BY INDUCTION SINTERING. Acta Metall Sin, 2011, 47(3): 327-332.

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Abstract  NiCr–based self–lubricating PM304 coatings have been used successfully in many high–temperature, high–speed applications such as air cycle machines, bleed air turbo compressors and turbo expanders. However, coarse PM304 coatings are not fully dense, containing a few percentages of pores and cracks which are harmful not only to the coating’s tribological properties but also to the coating’s overall mechanical strength. Furthermore, fine IS304 was prepared by the methods of high energy ball milling and induction sintering. The size oself–lubricating phase was refinedwith Ag particles of about 5 μm and BaF2/CaF2 of about 1 μm. The results show that temperature and microstructure have a great effect on wear properties of IS304 and PM304 coatings. At the temperature of 20—340 ℃, the friction coefficients of two types of coatings (IS304 and PM304) are higher, and the microscopic brittle fracture is the dominant wear mechanism. With the increase of the temperature, the coefficient of the coatings decreases rapidly due to the formation of self–lubricating film on the worn surfaces which consist of Ag and fluoride. At the temperature of 340—700 ℃, since the self lubricating phase is fine and uniformly distributed in the IS304 coatings, it makes the formation of an intact lubricating film as well as Ag film fine and well distributed. Thus, the friction coefficient of IS304 is lower than that of PM304. With a further increase at the temperature of 700—800 ℃, there is the plastic flow on the surfces of the softened self–lubricating film under the influence of the friction force. Consequently, the friction coefficients of the coatings increase obviously. Comparing the PM304 with IS34 coatings, as the size of Ag film is large and he plastic flow of Ag film is much more severe than that of fluoride film, the friction coefficient of PM304 is higher than that of IS304.
Key words:  self–lubricating film      friction coefficient      fluoride      Ag     
Received:  03 November 2010     
Fund: 

Supported by National Natural Science Foundation of China (Nos.50771077 and 50635060) and National Basic Research Program of China (Nos.2007CB707705 and 2007CB707706)

URL: 

https://www.ams.org.cn/EN/10.3724/SP.J.1037.2010.00585     OR     https://www.ams.org.cn/EN/Y2011/V47/I3/327

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