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research-article

Mechanical properties and adhesive scuffing wear behaviour of stir cast Cu-Sn-Ni/ Si3N4 composites

[+] Author and Article Information
Nithesh R

Department of Mechanical Engineering Amrita School of Engineering, Coimbatore Amrita Vishwa Vidyapeetham Amrita University, India
nitheshr2014@gmail.com

Radhika N

Department of Mechanical Engineering Amrita School of Engineering, Coimbatore Amrita Vishwa Vidyapeetham Amrita University, India
n_radhika1@cb.amrita.edu

Shiam Sunder S

Department of Mechanical Engineering Amrita School of Engineering, Coimbatore Amrita Vishwa Vidyapeetham Amrita University, India
shiam666666@gmail.com

1Corresponding author.

ASME doi:10.1115/1.4036185 History: Received October 03, 2016; Revised February 16, 2017

Abstract

The modern technology developments have seeded for the necessity of composite materials that are incorporated with high hardness, high tensile strength and better wear properties. Cu-Sn-Ni alloy as well as the composites of varying wt% of Si3N4 (5, 10 and 15) are fabricated by liquid metallurgy technique. The alloy and composites are tested for their tensile strength and hardness on Universal Testing Machine and Vickers microhardness tester respectively. Based on the tests, Cu-Sn-Ni/ 10 wt% of Si3N4 is found to have optimum mechanical properties. The scuff type adhesive wear behaviour is studied through pin-on-disc tribometer under dry sliding conditions for Cu-Sn-Ni/ 10 wt% of Si3N4 composite. Taguchi's Design of Experiments technique based on L27 orthogonal array model is used for analyses of process parameters in three levels such as applied load (10, 20 and 30 N), sliding distance (500,1000 and 1500 m) and sliding velocity (1, 2 and 3 m/s). The parameters are ranked based on Signal-to-Noise ratio and Analysis of Variance approach. Based on wear results, applied load is found to have highest stature on influencing wear rate followed by sliding distance and sliding velocity. A generalized wear rate equation is obtained based on the linear regression model and its feasibility is checked. Scanning Electron Microscope analyses revealed severe delamination occurred on maximum load condition. The development of this copper composite can have the possibility of replacing aluminium bearings.

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