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Research Papers: Other (Seals, Manufacturing)

Tribological Properties of Spark Plasma Sintered NiCr–Cr2AlC Composites at Elevated Temperature

[+] Author and Article Information
Xinliang Li, Hong Yin

Shenzhen Key Laboratory of Advanced Materials,
Shenzhen Graduate School,
Harbin Institute of Technology,
HIT Campus,
Shenzhen University Town,
Xili, Nanshan
Shenzhen 518055, China

Yu-Feng Li

Shenzhen Key Laboratory of Advanced Materials,
Shenzhen Graduate School,
Harbin Institute of Technology,
HIT Campus,
Shenzhen University Town,
Xili, Nanshan
Shenzhen 518055, China
e-mail: yfli@hit.edu.cn

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received April 1, 2018; final manuscript received October 15, 2018; published online November 21, 2018. Assoc. Editor: Yi Zhu.

J. Tribol 141(3), 032202 (Nov 21, 2018) (7 pages) Paper No: TRIB-18-1132; doi: 10.1115/1.4041763 History: Received April 01, 2018; Revised October 15, 2018

In this work, layered ternary Cr2AlC powders with high purity and a size of 0.5–1 μm were synthesized by solid-state reaction method. NiCr–Cr2AlC composites have been prepared by spark plasma sintering (SPS) process. The composites' tribological properties were evaluated against alumina ball under dry sliding condition from room temperature to 600 °C. Compared with unmodified NiCr alloy, Cr2AlC addition has an effect on reduction of friction coefficient of NiCr–Cr2AlC composites at the temperatures up to 400 °C. Especially, in comparison with NiCr alloy, the wear rates of NiCr–Cr2AlC composites significantly decrease from 10−4 mm3/(N·m) to 10−5–10−6 mm3/(N·m) from room temperature to 600 °C (except for 200 °C). The NiCr–20 wt % Cr2AlC composite exhibited excellent tribological properties with a friction coefficient of 0.3–0.4 and a wear rate of about 10−6 mm3/(N·m) from 400 °C to 600 °C. Through the analysis of scanning electron microscope (SEM) and X-ray photoelectron spectroscope (XPS), it is clarified that effective improvement of tribological properties of NiCr–Cr2AlC composites is attributed to a glaze layer consisting of NiO, Cr2O3, Al2O3, and NiCr2O4, which is formed by tribo-oxidation during wear process.

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Figures

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Fig. 1

HT-1000 high temperature tribometer

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Fig. 2

X-ray diffractometer result and morphology of Cr2AlC powders: (a) XRD pattern and (b) SEM image

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Fig. 3

TEM images of the NC20C composite ((a) and (b)) and corresponding SAED patterns ((c) Cr2AlC and (d) Cr7C3)

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Fig. 4

Tribological properties of NiCr alloy and different NiCr–Cr2AlC composites measured at different test temperatures: (a) friction coefficient and (b) wear rate

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Fig. 5

Worn surfaces of NiCr alloy at different test temperatures: (a) and (b) room temperature; (c) and (d) 200 °C; (e) and (f) 400 °C; (g) and (h) 600 °C

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Fig. 6

Raman spectrum of the worn surface of NiCr alloy at 400 °C (marked region A in Fig. 5(e))

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Fig. 7

Worn surfaces of NC20C at different test temperatures: (a) and (b) room temperature; (c) and (d) 200 °C; (e) and (f) 400 °C; (g) and (h) 600 °C

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Fig. 8

X-ray photoelectron spectra of elements on the worn surfaces of NC20C at room temperature and 400 °C: (a) Ni2p, (b) Cr2p, and (c) Al2p

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Fig. 9

Worn surface of counterpart Al2O3 ball after dry sliding against NC20C at room temperature and 400 °C: (a) room temperature, (b) EDS analysis of the marked region A, (c) 400 °C, and (d) EDS analysis of the marked region B

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