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Effect of spark plasma sintering on the microstructure and in vitro behavior of plasma sprayed HA coatings

Paper ID Volume ID Publish Year Pages File Format Full-Text
13363 852 2003 11 PDF Available
Title
Effect of spark plasma sintering on the microstructure and in vitro behavior of plasma sprayed HA coatings
Abstract

The crystalline phases and degree of crystallinity in plasma sprayed calcium phosphate coatings on Ti substrates are crucial factors that influence the biological interactions of the materials in vivo. In this study, plasma sprayed hydroxyapatite (HA) coatings underwent post-spray treatment by the spark plasma sintering (SPS) technique at 500°C, 600°C, and 700°C for duration of 5 and 30 min. The activity of the HA coatings before and after SPS are evaluated in vitro in a simulated body fluid. The surface microstructure, crystallinity, and phase composition of each coating is characterized by scanning electron microscopy and X-ray diffractometry before, and after in vitro incubation. Results show that the plasma sprayed coatings treated for 5 min in SPS demonstrated increased proportion of β-TCP phase with a preferred-orientation in the (2 1 4) plane, and the content of β-TCP phase corresponded to SPS temperature, up to 700°C. SPS treatment at 700°C for 30 min enhanced the HA content in the plasma spray coating as well. The HA coatings treated in SPS for 5 min revealed rapid surface morphological changes during in vitro incubation (up to 12 days), indicating that the surface activity is enhanced by the SPS treatment. The thickest apatite layer was found in the coating treated by SPS at 700°C for 5 min.

Keywords
Hydroxyapatite (HA); β-Tricalcium phosphate; Plasma sprayed coating; Spark plasma sintering (SPS); In vitro; Simulated body fluid (SBF)
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Effect of spark plasma sintering on the microstructure and in vitro behavior of plasma sprayed HA coatings
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biomaterials - Volume 24, Issue 16, July 2003, Pages 2695–2705
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us