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research-article

Tribological Properties of Spark Plasma Sintered NiCr-Cr2AlC Composites at Elevated temperature

[+] Author and Article Information
Xinliang Li

Shenzhen Key Laboratory of Advanced Materials, Shenzhen Graduate School, Harbin Institute of Technology, HIT Campus, Shenzhen University Town, Xili, Nanshan, Shenzhen 518055, PR China
4835598@qq.com

Hong Yin

Shenzhen Key Laboratory of Advanced Materials, Shenzhen Graduate School, Harbin Institute of Technology, HIT Campus, Shenzhen University Town, Xili, Nanshan, Shenzhen 518055, PR China
jlccer6@163.com

Yufeng Li

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

1Corresponding author.

ASME doi:10.1115/1.4041763 History: Received April 01, 2018; Revised October 15, 2018

Abstract

In the present work, layered ternary Cr2AlC powders with high purity and a size of 0.5-1 ┬Ám 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?. Compared with unmodified NiCr alloy, Cr2AlC addition has an effect on reduction of friction coefficient of NiCr-Cr2AlC composites at the temperature up to 400?. Especially, the wear rates of NiCr-Cr2AlC composites significantly decrease from 10-4mm3/(Nm) to 10-5-10-6mm3/(Nm) in contrast with NiCr alloy from room temperature to 600? (except for 200?). 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 10-6mm3/(Nm) from 400? to 600?. Through the analysis of SEM and 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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