Premium
Recent trends towards improved plasma‐sprayed advanced bioceramic coatings on Ti6Al4V implants
Author(s) -
Heimann R. B.
Publication year - 1999
Publication title -
materialwissenschaft und werkstofftechnik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.285
H-Index - 38
eISSN - 1521-4052
pISSN - 0933-5137
DOI - 10.1002/(sici)1521-4052(199912)30:12<775::aid-mawe775>3.0.co;2-w
Subject(s) - bioceramic , materials science , amorphous calcium phosphate , titanium , crystallinity , ceramic , titanium alloy , chemical engineering , metallurgy , nuclear chemistry , chemistry , composite material , alloy , calcium , engineering
In this contribution several recent trends are being described towards engineering of bioceramic coatings applied by thermal spraying to titanium alloy substrates. (i) Optimization by statistical experimental design methodology of plasma spray parameters can be used to deposit coatings with low porosity, comparatively high adhesive strength and optimum crystallinity. (ii) Microstructural engineering of the hydroxyapatite powder by pre‐spray annealing, i. e. sintering leads to a substantial decrease of the microporosity of the ceramic grains hence improving both adhesion strength and in vitro resorption resistance. (iii) Bond coats based on titania and titania / zirconia can be used to control the rate of heat transfer from the molten particles to the substrate and hence to improve the in vivo resorption resistance by suppressing the formation of amorphous calcium phosphate (ACP). (iv) Replacement of hydroxyapatite by specific compositions in the quaternary system CaO‐TiO 2 ‐ZrO 2 ‐P 2 O 5 is a potential way to generate coatings with high chemical stability for long‐term performance.