Preparation of hydroxyapatite coating deposited on the titanium alloy surface with magnetron sputtering technique

Dongyang LIN; Yutao ZHAO; Zhao ZHANG; Qiuping SHI

ABSTRACT

BACKGROUND:

Radio frequency (RF) magnetron sputtering is a mature technique to prepare metallic (ceramic) coating on ceramic (metallic) substrate, which possesses low-amplitude temperature increasing substrate,rapid deposition rate, even coating component, stable performance, high binding intensity and other advantages.

OBJECTIVE:

To investigate the structure of hydroxyapatite(HA) coating prepared with RF magnetron sputtering technique and the binding performance of coating and interface of substrate.

DESIGN:

Single-sample observation.

SETTING:

College of Material Science and Engineering, Jiangsu University.MATERIALS 30 mm×30 mm×3 mm Ti-6Al-4V plate and JGP500 MultiFunction Ultrahigh Vacuum Magnetron Sputtering System were used in this experiment.

METHODS:

This experiment was carried out at the Center of Material Experiment, Jiangsu University from December 2003 to September 2004.HA coating was prepared on the surface of Ti-6Al-4V substrate with RF magnetron sputtering technique, appearance of coating surface and crosssection were observed with scanning electron microscope (SEM), phase structure of coating was analyzed with X-ray diffractometer,Ca/P of coating was analyzed with Energy Dispersive X-ray Spectrometer and binding intensity of coating and interface of substrate was measured with e thoxyline resin-7 butt joint.MAIN OUTCOME

MEASURES:

① Micro-appearance of HA coating.② Composition of HA coating and the effect of postprocessing. ③ Binding status and intensity of HA coating and substrate interface.

RESULTS:

①Under the SEM, coating surface of HA was rough and uneven in surface, presented many pores and reticular structure. Pore area was about 30% to 40%. ② Ca/P of HA coating was 1.7. The essential component of treated HA coating was HA with high crystallization, without other calcium and phosphonium phase. ③ The binding intensity of HA coating and substrate interface was 51.2 MPa.

CONCLUSION:

HA coating prepared with RF magnetron sputtering technique has good appearance, high binding intensity at the interface of substrate.