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Acta Metall Sin  2009, Vol. 45 Issue (3): 297-301    DOI:
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HIGH TEMPERATURE WEAR BEHAVIOR OF NiAl--Cr(Mo)--Ho--Hf EUTECTIC ALLOY
WANG Zhensheng1;2;GUO Jianting1;ZHOU Lanzhang1;SHENG Liyuan1;HU Zhuangqi1
1 Institute of Metal Research; Chinese Academy of Sciences; Shenyang 110016
2 School of Electromechanical Engineering; Hunan University of Science and Technology; Xiangtan 411201
Cite this article: 

WANG Zhensheng GUO Jianting ZHOU Lanzhang SHENG Liyuan HU Zhuangqi. HIGH TEMPERATURE WEAR BEHAVIOR OF NiAl--Cr(Mo)--Ho--Hf EUTECTIC ALLOY. Acta Metall Sin, 2009, 45(3): 297-301.

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Abstract  

The wear behaviors of NiAl--28Cr--5.6Mo--0.25Ho--0.15Hf eutectic alloy against SiC ceramic under dry sliding from 600 to 1000 ℃ were investigated on a pin--on--disc test rig. The results show that the eutectic alloy exhibits excellent self--lubricating properties in the temperature range of 700---900 ℃, which is attributed to the formation of 1---3 μm thick glass--ceramic lubricant film. During wear testing the lubricant film was partially transferred to the SiC counterface, which avoided the direct tribo--contact between the alloy and SiC ceramic. At temperatures above 900 ℃ or below 700 ℃ the friction coefficient and wear rate are higher, owing to the adhesion between matrix and film weakening or no film forming.

Key words:  NiAl--Cr(Mo)--Ho--Hf eutectic alloy      SiC ceramic      friction and wear behavior      self--lubricating      glass--ceramic film     
Received:  04 August 2008     
ZTFLH: 

TH117.1

 
  TG146.1

 

URL: 

https://www.ams.org.cn/EN/     OR     https://www.ams.org.cn/EN/Y2009/V45/I3/297

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