AVS 47th International Symposium
    Thin Films Tuesday Sessions
       Session TF-TuP

Paper TF-TuP1
Influence of Annealing Temperature on Simultaneous Vapor Deposited Calcium Phosphate Thin Films

Tuesday, October 3, 2000, 5:30 pm, Room Exhibit Hall C & D

Session: Poster Session
Presenter: M. Hamdi, Kyoto University, Japan
Authors: M. Hamdi, Kyoto University, Japan
A.M. Ektessabi, Kyoto University, Japan
Correspondent: Click to Email
Calcium phosphate is an important bioceramic with tremendous potential for biomedical applications. Its unique bioactivity promotes rapid bone growth and strong interfacial fixation that has particular benefit to orthopedic and dental applications. The effect of different annealing temperature on the characteristics of thin film calcium phosphate coatings fabricated by a novel simultaneous vapor deposition method was investigated. Heat treating the as-deposited films was necessary to change the amorphous coating to a crystalline coating. The films were annealed for 3 h at 400, 700, 1000 and 1200°C in air. After annealing, the structure and the chemical composition of these films were characterized with incident light microscopy, rutherford backscattering spectroscopy and x-ray diffraction. Scratch test was conducted to measure the adhesion strength of the coatings to the substrate. Results showed that after annealing at 1000°C, crystalline hydroxyapatite appeared to co-exist with tricalcium phosphate phase. The surface roughness increased with increasing annealing temperature. The adhesion of the coatings was highly affected by the annealing temperature. From the results, it can be suggested that 1000-1200°C is probably the best annealing temperature range for calcium phosphate coatings produced by simultaneous vapor deposition method.