Functionally graded bioactive glass coatings on bioinert metallic substrates were produced by using continuous-wave (CW) laser irradiation. The aim is to achieve strong adhesion on the substrates and high bioactivity on the top surface of a coating material for load-bearing implants in biomedical applications. The morphology and microstructure of the bioactive glass from the laser coating process were investigated as functions of processing parameters. Laser sintering mechanisms were discussed with respect to the resulting morphology and microstructure. It has been shown that double layer laser coating results in a dense bond coat layer and a porous top coat layer with lower degree of crystallinity than an enameling coating sample. The dense bond coat strongly attached to the titanium substrate with a 10 μm wide mixed interfacial layer. A highly bioactive porous structure of the top coat layer is beneficial for early formation of a bone-bonding hydroxycarbonate apatite (HCA) layer. The numerical model developed in this work also allows for prediction of porosity and crystallinity in top coat layers of bioactive glass developed through laser induced sintering and crystallization.
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June 2015
Research-Article
Laser Induced Porosity and Crystallinity Modification of a Bioactive Glass Coating on Titanium Substrates
Panjawat Kongsuwan,
Panjawat Kongsuwan
Department of Mechanical Engineering,
e-mail: pk2261@columbia.edu
Columbia University
,New York, NY 10027
e-mail: pk2261@columbia.edu
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Grant Brandal,
Grant Brandal
Department of Mechanical Engineering,
e-mail: gbb2114@columbia.edu
Columbia University
,New York, NY 10027
e-mail: gbb2114@columbia.edu
Search for other works by this author on:
Y. Lawrence Yao
Y. Lawrence Yao
Professor
Advanced Manufacturing Laboratory,
Department of Mechanical Engineering,
e-mail: yly1@columbia.edu
Advanced Manufacturing Laboratory,
Department of Mechanical Engineering,
Columbia University
,New York, NY 10027
e-mail: yly1@columbia.edu
Search for other works by this author on:
Panjawat Kongsuwan
Department of Mechanical Engineering,
e-mail: pk2261@columbia.edu
Columbia University
,New York, NY 10027
e-mail: pk2261@columbia.edu
Grant Brandal
Department of Mechanical Engineering,
e-mail: gbb2114@columbia.edu
Columbia University
,New York, NY 10027
e-mail: gbb2114@columbia.edu
Y. Lawrence Yao
Professor
Advanced Manufacturing Laboratory,
Department of Mechanical Engineering,
e-mail: yly1@columbia.edu
Advanced Manufacturing Laboratory,
Department of Mechanical Engineering,
Columbia University
,New York, NY 10027
e-mail: yly1@columbia.edu
Contributed by the Manufacturing Engineering Division of ASME for publication in the JOURNAL OF MANUFACTURING SCIENCE AND ENGINEERING. Manuscript received April 22, 2014; final manuscript received December 21, 2014; published online February 16, 2015. Assoc. Editor: Y.B. Guo.
J. Manuf. Sci. Eng. Jun 2015, 137(3): 031004 (12 pages)
Published Online: June 1, 2015
Article history
Received:
April 22, 2014
Revision Received:
December 21, 2014
Online:
February 16, 2015
Citation
Kongsuwan, P., Brandal, G., and Lawrence Yao, Y. (June 1, 2015). "Laser Induced Porosity and Crystallinity Modification of a Bioactive Glass Coating on Titanium Substrates." ASME. J. Manuf. Sci. Eng. June 2015; 137(3): 031004. https://doi.org/10.1115/1.4029566
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