Hydroxyapatite had been confirmed to be bioactive since it was first made in the 1970^’s. The artificial synthetic material had been used as an important biomaterial for numerous medical applications, such as ortopedical and dental implants. HAp possesses low mechanical strength and fracture toughness which is an obstacle to its applications.

A suitable method for improving the mechanical properties is based on the synthesis of composites made oh HAp and other phases (i.e. ZrO₂). Zirconia which has the characteristics of high strength and stress-induced phase transformation toughening, has been used to improve the strength of brittle materials. ZrO₂ ceramics are a bioinert material [2-4].

Spherical HAp powder were added to 8%wt. yttrium partially stabilized zirconia powder (YSZ) and 20% wt.Y₂O₃ and coated on the titanium substrate. Plasma treatment was conducted on plasma sprayed hydroxyapatite (HA) coatings. Various plasma parameters were investigated. The study examines the use of a plasma to enhance the coating HA,  HA+ ZrO₂+Y₂O_3.  The crystalline phases of the HAp and HAp+ZrO₂ coatings were analyzed by X-ray diffractometry.

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1. Electrochemical corrosion properties of hydroxyapatite composite