Surface modification of investment cast-316L implants: microstructure effects

Shimaa El-Hadad; Waleed Khalifa; Adel Nofal

doi:10.1016/j.msec.2014.12.038

Surface modification of investment cast-316L implants: microstructure effects

Mater Sci Eng C Mater Biol Appl. 2015 Mar:48:320-7. doi: 10.1016/j.msec.2014.12.038. Epub 2014 Dec 11.

Authors

Shimaa El-Hadad¹, Waleed Khalifa², Adel Nofal³

Affiliations

¹ Central Metallurgical Research & Development Institute, P.O. Box 87, Helwan, Cairo, Egypt. Electronic address: shimaam@cmrdi.sci.eg.
² Cairo University, Faculty of Engineering, Dept. of Mining, Petroleum and Metallurgical Engineering, 12613 Giza, Egypt. Electronic address: wkhalifa@eng.cu.edu.eg.
³ Central Metallurgical Research & Development Institute, P.O. Box 87, Helwan, Cairo, Egypt. Electronic address: adelnofal@cmrdi.sci.eg.

PMID: 25579929
DOI: 10.1016/j.msec.2014.12.038

Abstract

Artificial femur stem of 316L stainless steel was fabricated by investment casting using vacuum induction melting. Different surface treatments: mechanical polishing, thermal oxidation and immersion in alkaline solution were applied. Thicker hydroxyapatite (HAP) layer was formed in the furnace-oxidized samples as compared to the mechanically polished ones. The alkaline treatment enhanced the precipitation of HAP on the samples. It was also observed that the HAP precipitation responded differently to the different phases of the microstructure. The austenite phase was observed to have more homogeneous and smoother layer of HAP. In addition, the growth of HAP was sometimes favored on the austenite phase rather than on ferrite phase.

Keywords: Hydroxyapatite; Investment casting; Stainless steel; Surface modification.

MeSH terms

Coated Materials, Biocompatible*
Durapatite*
Femur
Humans
Prostheses and Implants*
Stainless Steel*

Substances

Coated Materials, Biocompatible
Stainless Steel
Durapatite