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Research Papers: Coatings & Solid Lubricants

NiAl Matrix Self-Lubricating Composite at a Wide Temperature Range

[+] Author and Article Information
Shengyu Zhu

State Key Laboratory of Solid Lubrication,
Lanzhou Institute of Chemical Physics,
Chinese Academy of Sciences,
Lanzhou 730000, China
e-mail: zhusy@licp.cas.cn

Lingqian Kong

College of Textile and Clothing,
Dezhou University,
Dezhou 253023, China

Fei Li, Jinming Zhen

State Key Laboratory of Solid Lubrication,
Lanzhou Institute of Chemical Physics,
Chinese Academy of Sciences,
Lanzhou 730000, China
University of Chinese Academy of Sciences,
Beijing 100039, China

Jun Yang

State Key Laboratory of Solid Lubrication,
Lanzhou Institute of Chemical Physics,
Chinese Academy of Sciences,
Lanzhou 730000, China
e-mail: jyang@ licp.cas.cn

Jiqiang Ma, Jun Cheng, Zhuhui Qiao

State Key Laboratory of Solid Lubrication,
Lanzhou Institute of Chemical Physics,
Chinese Academy of Sciences,
Lanzhou 730000, China

1Corresponding authors.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received September 15, 2014; final manuscript received October 10, 2014; published online November 17, 2014. Assoc. Editor: Dae-Eun Kim.

J. Tribol 137(2), 021301 (Apr 01, 2015) (6 pages) Paper No: TRIB-14-1225; doi: 10.1115/1.4028921 History: Received September 15, 2014; Revised October 10, 2014; Online November 17, 2014

Self-lubricating composite NiAl–Cr–Mo–CaF2–Ag was fabricated by powder metallurgy technique. The NiAl matrix composite with 10 wt.% Ag provides self-lubricating properties at a broad temperature range between room temperature and 1000 °C. Especially at 800 °C, the composite offers excellent friction reduction about 0.2 and wear resistance about 0.7 × 10−4 mm3 N−1 m−1. The lubricous behavior at a wide temperature range could be attributed to the synergistic effect of Ag, CaF2, CaCrO4, and CaMoO4.

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Figures

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Fig. 1

Variation of friction coefficients of the NiAl matrix composites at diverse temperatures

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Fig. 2

Evolution of friction coefficients of AG10 with sliding time at different temperatures

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Fig. 3

Evolution of friction coefficients of the NiAl matrix composites with sliding time at 800 °C

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Fig. 4

Variation of wear-rates of the NiAl matrix composites at diverse temperatures

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Fig. 5

Worn surfaces of AG10 composite after friction tests at different temperatures: (a) room temperature, (b) 200 °C, (c) 400 °C, (d) 600 °C, (e) 800 °C, and (f) 1000 °C; the sliding direction is from left to right

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Fig. 6

Worn surfaces of AG10 composite after sliding wear for 5 min at 800  °C; the magnification scale 300 × ; the sliding direction is from up to down

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Fig. 7

XRD results of worn surfaces of AG10 composite after friction tests at (a) room temperature and (b) 800 °C

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