Improvement of High Temperature Wear Behavior of In-Situ Cr3C2-20 wt. % Ni Cermet by Adding Mo

L Sun ,Hui Dong,Lin He,Wenyan Zhai,Yiran Wang

doi:10.3390/cryst10080682

Abstract

Cr3C2-Ni cermet is a kind of promising material especially for wear applications due to its excellent wear resistance. However, researches were mainly concentrated on the experiment condition of room temperature, besides high-temperature wear mechanism of the cermet would be utilized much potential applications and also lack of consideration. In present paper, the influence of Mo content on the high-temperature wear behavior of in-situ Cr3C2-20 wt. % Ni cermet was investigated systematically. The friction-wear experiment was carried out range from room temperature to 800 °C, while Al2O3 ceramic was set as the counterpart. According to experimental results, it is indicated that the coefficient of friction (COF) of friction pairs risen at the beginning of friction stage and then declined to constant, while the wear rate of Cr3C2-20 wt. % Ni cermet risen continuously along with temperature increased, which attributes to the converted wear mechanism generally from typical abrasive wear to severe oxidation and adhesive wear. Generally, the result of wear resistance was enhanced for 13.4% (at 400 °C) and 31.5% (at 800 °C) by adding 1 wt. % Mo. The in-situ newly formed (Cr, Mo)7C3 ceramic particle and the lubrication phase of MoO3 can effectively improve the wear resistance of Cr3C2-20 wt. % Ni cermet.

Highlights

Metal-ceramic composite simultaneously possesses the excellent strength of metals and high hardness of ceramics, which has attracted widely attention in thermal spraying, cutting operation and aerospace fields [1,2]
Chromium carbide ceramic particle served as an additive to increase the physical and abrasion resisting properties of the metal-ceramic composite [3]
The influence of the content of Mo on the microstructure, mechanical properties and high temperature oxidation resistance of Cr3 C2 -20 wt. % Ni cermet had been studied systematically. Based on these basic studies, the influence of the content of Mo on the high temperature wear behavior of in-situ Cr3 C2 -20 wt. % Ni cermet was investigated in this paper

Summary

Introduction

Metal-ceramic composite (cermet) simultaneously possesses the excellent strength of metals and high hardness of ceramics, which has attracted widely attention in thermal spraying, cutting operation and aerospace fields [1,2]. Cr3 C2 -Ni cermet exhibited high hardness and melting temperature, excellent high temperature oxidation and wear resistance It had been widely applied in the wear applications such as coating protection and cutting tools [9]. The effects of the hardness difference of Cr3 C2 -Ni cermet and Al2 O3 ceramic were more important than the sliding speed and load under two-body wear condition. The influence of the content of Mo on the microstructure, mechanical properties and high temperature oxidation resistance of Cr3 C2 -20 wt. % Ni cermet had been studied systematically Based on these basic studies, the influence of the content of Mo on the high temperature wear behavior of in-situ Cr3 C2 -20 wt. Based on these basic studies, the influence of the content of Mo on the high temperature wear behavior of in-situ Cr3 C2 -20 wt. % Ni cermet was investigated in this paper

Experimental Method

MaterialsThe

Results and Discussion

Conclusions