Microstructures and metal-ceramic bond properties of Co-Cr biomedical alloys fabricated by selective laser melting and casting

Selective laser melting (SLM) technique, based on a layer-by-layer production, was used to produce biomedical Co-Cr devices specifically developed for dental restoration applications. However, information on the metal-ceramic bond strength of SLM-manufactured parts was limited. In this study, SLM-fa...

Full description

Saved in:
Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2019-06, Vol.759, p.594-602
Main Authors: Zhou, Yanan, Wei, Wei, Yan, Jiazhen, Liu, Wenbo, Li, Ning, Li, Haopeng, Xu, Sheng
Format: Article
Language:English
Subjects:
Alloys
Bend properties
Bend tests
Bond strength
Bonding strength
Casting alloys
Ceramic bonding
Ceramics
Cermets
Chemical bonds
Chromium
Co-Cr alloy
Cobalt base alloys
Dental materials
Diffusion layers
Dispersion
Interfacial characterization
Intermetallic compounds
Martensite
Matching
Microstructure
Organic chemistry
Porcelain
Properties (attributes)
Scanning electron microscopy
Selective laser melting
Thermal expansion
Thermal expansion coefficient
Transmission electron microscopy
X-ray diffraction
X-ray spectroscopy
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Selective laser melting (SLM) technique, based on a layer-by-layer production, was used to produce biomedical Co-Cr devices specifically developed for dental restoration applications. However, information on the metal-ceramic bond strength of SLM-manufactured parts was limited. In this study, SLM-fabricated Co-Cr alloy specimens were subjected to subsequent heat treatments (holding at 1150 °C for 1 h). The alloy microstructures were characterized by scanning electron microscopy (SEM) coupled with energy-dispersive x-ray spectroscopy (EDX), x-ray diffractometer (XRD), and transmission electron microscopy, whereas the bond properties were evaluated by 3-point bend tests and coefficient of thermal expansion (CTE) tests, as compared to casting (CAST) alloys. Results showed that SLM specimens exhibited fine grains and homogeneously dispersed intermetallic compounds, and the resultant XRD analysis revealed a predominated face-centered cubic γ-Co phase (72 %). Student's t-test demonstrated that bond strengths of SLM specimens (45.80 ± 1.91 MPa) were significantly lower than that of CAST specimens (54.05 ± 6.77 MPa) (P 25MPa specified in ISO9693).
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2019.05.085