Plasma Sprayed HA/TiO2 Composite Coatings
等离子喷涂HA/TiO2复合涂层

HA/TiO2 composite coatings were fabricated successfully via atmospheric plasma spraying, whose bonding strength, microstructure and surface mophology after immersion in deionized water were investigated. The obtained results reveal that the bonding strengthes of HA/TiO2composite coatings are much higher than that of HA coating and the fracture mechanism of the coating changes from adhesive failure to cohesive failure owing to the addition of TiO2 in the coating. The reason for this is the addition of TiO2 in the coating reduces the mismatch of thermal expansion coefficient between the coating and the substrate. SEM obeservation shows that there are some micro cracks in the composite coatings which disappear after immersion in deionized water for a day, and almost no new cracks generate again. This means that both the adhesive strength and the cohesive strength are improved by the addition of TiO2 in the coating.