TY - JOUR
T1 - Study of the interfacial reactions between a bioactive apatite-mullite glass-ceramic coating and titanium substrates using high angle annular dark field transmission electron microscopy
AU - Stanton, Kenneth T.
AU - O'Flynn, Kevin P.
AU - Nakahara, Shohei
AU - Vanhumbeeck, Jean François
AU - Delucca, John M.
AU - Hooghan, Bobby
PY - 2009/4
Y1 - 2009/4
N2 - Glass of generic composition SiO2 • Al2O 3 • P2O5 • CaO • CaF2 will crystallise predominantly to apatite and mullite upon heat-treatment. Such ceramics are bioactive, osseoconductive, and have a high resistance to fracture. As a result, they are under investigation for use as biomedical device coatings, and in particular for orthopaedic implants. Previous work has shown that the material can be successfully enamelled to titanium with an interfacial reaction zone produced during heat treatment. The present study uses high angle annular dark field transmission electron microscopy (HAADF-TEM) to conduct a detailed examination of this region. Results show evidence of complex interfacial reactions following the diffusion of titanium into an intermediate layer and the production of titanium silicides and titanium phosphides. These results confirm previously hypothesised mechanisms for the bonding of silicate bioceramics with titanium alloys.
AB - Glass of generic composition SiO2 • Al2O 3 • P2O5 • CaO • CaF2 will crystallise predominantly to apatite and mullite upon heat-treatment. Such ceramics are bioactive, osseoconductive, and have a high resistance to fracture. As a result, they are under investigation for use as biomedical device coatings, and in particular for orthopaedic implants. Previous work has shown that the material can be successfully enamelled to titanium with an interfacial reaction zone produced during heat treatment. The present study uses high angle annular dark field transmission electron microscopy (HAADF-TEM) to conduct a detailed examination of this region. Results show evidence of complex interfacial reactions following the diffusion of titanium into an intermediate layer and the production of titanium silicides and titanium phosphides. These results confirm previously hypothesised mechanisms for the bonding of silicate bioceramics with titanium alloys.
UR - http://www.scopus.com/inward/record.url?scp=61349196187&partnerID=8YFLogxK
U2 - 10.1007/s10856-008-3650-8
DO - 10.1007/s10856-008-3650-8
M3 - Article
C2 - 19034617
AN - SCOPUS:61349196187
SN - 0957-4530
VL - 20
SP - 851
EP - 857
JO - Journal of Materials Science: Materials in Medicine
JF - Journal of Materials Science: Materials in Medicine
IS - 4
ER -