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Research Papers: Coatings & Solid Lubricants

# Microstructure and Tribological Properties of $ZrB2$-Containing Composite Coating Produced on Pure Ti Substrate by Laser Surface Alloying

[+] Author and Article Information
Chun Guo, Jierong Zhao, Jianmin Chen

State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, No. 18, Tianshui Middle Road, Lanzhou 730000, China

Jiansong Zhou

State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, No. 18, Tianshui Middle Road, Lanzhou 730000, Chinajszhou@lzb.ac.cn

J. Tribol 133(1), 011301 (Dec 15, 2010) (7 pages) doi:10.1115/1.4003066 History: Received July 08, 2010; Revised November 05, 2010; Published December 15, 2010; Online December 15, 2010

## Abstract

$ZrB2$-containing composite coating was fabricated on pure Ti substrate by laser surface alloying. The microstructure of the composite coating was investigated by means of X-ray diffraction and scanning electron microscopy (SEM). The friction and wear properties of $ZrB2$-containing composite coating sliding against a GCr15 steel ball at different normal loads and sliding speeds were evaluated. The morphologies of the worn surfaces were analyzed by means of SEM and three dimensional noncontact surface mapping. It is shown that the microhardness and wear resistance of the pure Ti substrate are greatly increased after laser surface alloying, due to the formation of hard $ZrB2$ phase in the composite coating. Pure Ti substrate sliding against the GCr15 counterpart ball at room temperature is dominated by adhesion wear, abrasive wear, and severe plastic deformation, while $ZrB2$-containing composite coating involves only mild abrasive and fatigue wear when sliding against the GCr15 counterpart.

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## Figures

Figure 1

SEM image of the ZrB2 powder

Figure 2

XRD patterns of the ZrB2-containing composite coating

Figure 3

Cross-sectional morphologies of the ZrB2-containing composite coating: (a) SEM image and (b) backscattering image

Figure 4

Ti and Zr element distribution map on the ZrB2-containing composite coating’s cross section

Figure 5

Magnified cross-sectional SEM images of the ZrB2-containing composite coating (a) near the top surface and (b) near the interface

Figure 6

Microhardness profiles of the ZrB2-containing composite coating

Figure 7

Variation of friction coefficients of the pure Ti substrate and the ZrB2-containing composite coating as a function of normal load at a given sliding speed of 0.1 m/s

Figure 8

Variation of wear volumes of the pure Ti substrate and the ZrB2-containing composite coating as a function of normal load at a given sliding speed of 0.1 m/s

Figure 9

SEM images of the typical worn surfaces of (a) pure Ti substrate and (c) ZrB2-containing composite coating at 5 N normal load and (b) pure Ti substrate and (d) ZrB2-containing composite coating at 15 N normal load (sliding speed of 0.1 m/s)

Figure 10

3D noncontact surface mapping of the corresponding wear scars of (a) pure Ti substrate and (c) ZrB2-containing composite coating at 5 N normal load and (b) pure Ti substrate and (d) ZrB2-containing composite coating at 15 N normal load (sliding speed of 0.1 m/s)

Figure 11

Variation of friction coefficients of the pure Ti substrate and the ZrB2-containing composite coating as a function of sliding speed at a given normal load of 10 N

Figure 12

Variation of wear volumes of the pure Ti substrate and the ZrB2-containing composite coating as a function of sliding speed at a given normal load of 10 N

Figure 13

SEM images of the typical worn surfaces of (a) pure Ti substrate and (c) ZrB2-containing composite coating at a sliding speed of 0.025 m/s and (b) pure Ti substrate and (d) ZrB2-containing composite coating at a sliding speed of 0.2 m/s (normal load of 10 N)

Figure 14

3D noncontact surface mapping of the corresponding wear scars of (a) pure Ti substrate and (c) ZrB2-containing composite coating at a sliding speed of 0.025 m/s and (b) pure Ti substrate and (d) ZrB2-containing composite coating at a sliding speed of 0.2 m/s (normal load of 10 N)

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