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Technical Briefs

A Feasibility Study of LENS® Deposition of CoCrMo Coating on a Titanium Substrate

[+] Author and Article Information
G. D. Ram

Department of Mechanical and Aerospace Engineering, Utah State University, 4130 Old Main Hill, Logan, UT 84322-4130

B. E. Stucker1

Department of Mechanical and Aerospace Engineering, Utah State University, 4130 Old Main Hill, Logan, UT 84322-4130brent.stucker@usu.edu

1

Corresponding author.

J. Manuf. Sci. Eng 130(2), 024503 (Apr 11, 2008) (5 pages) doi:10.1115/1.2898573 History: Received August 11, 2007; Revised January 11, 2008; Published April 11, 2008

Titanium- and cobalt-base alloys are the most widely used orthopedic implant materials. As there are specific advantages and disadvantages with both of them, one approach to fabricate superior implants is to combine these two material systems. The current work examines the feasibility of depositing CoCrMo coatings on Ti substrates using Laser Engineered Net Shaping® . Studies show that deposition of CoCrMo coating on a Ti substrate is very challenging, cracking and delamination being the major observations. Several alternative strategies, which may lead to satisfactory coatings, are presented.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

Close-up view of a peeled-off CoCrMo coating

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Figure 2

Microstructures of the CoCrMo coating at different regions. Some portions of the coating were relatively defect free (a), but gross cracking was noticed at several locations (b). Note the prominently etched layer close to the coating/substrate interface (white arrows).

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Figure 3

Microstructural features in the prominently etched layer near the coating/substrate interface: (a) SE image and (b) BSE image

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Figure 4

SE (a) and BSE (b) images of the coating/substrate interface. The interface was free from gross cracking, but there were occasional porosity defects (shown by white arrow in Fig. 4), from which cracks seemed to originate in some cases.

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Figure 5

BSE image of the coating away from the prominently etched layer. Note the contrast differences due to chemical inhomogeneities.

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Figure 6

BSE image of the coating close to the top surface showing an interdendritic carbide network

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Figure 7

EDS line scan results. Scan started on the substrate side. The spot spacing is ∼1.5μm. The dashed line shows the coating/substrate interface.

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Figure 8

Fractographic features of the peeled-off (a) and mechanically fractured (b) coating surfaces

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