Effect of Phases on the Frictional Properties of Electroless Ni-B Nano-Composite Coating-Reference-Cited by-同舟云学术

Effect of Phases on the Frictional Properties of Electroless Ni-B Nano-Composite Coating

Published:2010-10-27 Issue: Volume: Page:
ISSN:1662-0356
Container-title:Advances in Science and Technology
language:
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Author:

Pal Soupitak¹,Jayaram Vikram¹,Biswas Sanjay Kumar¹,Riddle Yancy²

Affiliation:

1. Indian Institute of Science

2. UCT Coatings Inc.

Abstract

As-deposited amorphous (determined through XRD) electroless Ni-B coating upon heat treatment transforms to crystalline phases, Ni3B, Ni2B and Ni whose volume fractions can vary widely. A micro and nano tribological study through ball-on-disk tribometer and lateral force microscopy has been performed to understand the effect of phase mixture (Ni3B +Ni2B) on the frictional properties of this coating. Though scaling of the contact area from micro to nano level strongly influences the friction coefficient, it has also been found that increase in the Ni2B:Ni3B ratio of the crystalline coating reduces the friction coefficient significantly.

Publisher

Trans Tech Publications Ltd

Link

https://www.scientific.net/AST.66.120.pdf

Reference7 articles.

1. 2. Characterization of Frictional Behaviour The two different instruments enable the study of the frictional behaviour of this coating over a wide range of contact area from nanometric (AFM) to micrometric level (Tribometer) i. e., from a situation of single asperity to multiple asperity contact behaviour. Fig. 5(a) shows a typical plot of coefficient of friction against number of laps of traverse of the ball for 385 0C/4 hrs heat treated sample while Fig. 5(b) is the representative plot of lateral force measured against different normal forces for same sample. Fig 5a Fig 5b Fig. 5: (a) Coefficient of friction measured in ball on disk tribometer, (b) typical lateral force against normal force determined through AFM (385 0C/4 hrs heat treatment). Table 1 summarises all the data and clearly reveals that the steady state coefficient of friction is reduced through introduction of the Ni2B phase into the coating when tested in the AFM as well as by ball-on-flat tribometry. Fig. 5b exhibits a typical plot of lateral force against normal force showing a linear relationship consistent with Amonton's law. Table 1: Comparison of the coating's coefficient of friction from micro to nano level Sample heat treatment condition Coefficient of friction measured through micro-tribometer. Coefficient of friction measured through AFM. 300 0C/10 hrs.

2. 64 ± 0. 03.

3. 032 ± 0. 002 385 0C/4 hrs.

4. 50 ± 0. 04.

5. 018 ± 0. 001 430 0C rapidly cooled.

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