Plasma Sprayed HA/TiO2 Composite Coatings

Abstract

Abstract: 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/TiO₂ composite 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.

Key words: HA coating, TiO₂, bonding strength, plasma spraying

CLC Number:

TQ174
O539

ZHENG Xue-Bin,ZHOU Xia-Ming,ZHANG Ye-Fang,DING Chuan-Xian. Plasma Sprayed HA/TiO₂ Composite Coatings[J]. Journal of Inorganic Materials.

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Plasma Sprayed HA/TiO₂ Composite Coatings

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