Citation:
LIU Rong-Fang, XIAO Xiu-Feng. Hydrothermal Electrodeposition and Properties of Hydroxyapatite/Zirconia Composite Coatings[J]. Chinese Journal of Applied Chemistry,
;2006, 23(6): 612-616.
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HA/ZrO2 composite coatings were successfully prepared on titanium electrode by means of the hydrothermal electrodeposition method via adding ZrO2 powder in the electrolyte in an autoclave.The bonding strength,bioactivity and thermal stability of the coatings were investigated.The results obtained show that the bonding strength of HA/ZrO2 composite coating is obviously higher than that of pure HA coating.HA/ZrO2 composite coating surfaces are covered by carbonate-apatite coating after immersion in simulate body fluid for 7 d,which indicates that the bonding strength of the coating is improved without the decrease of the bioactivity by the addition of the ZrO2 in HA coating.Tetragonal phase ZrO2(t-ZrO2) underwent a martensitic transformation to monoclinic phase ZrO2(m-ZrO2) after sintering treatment.At sintering temperature above 700℃,HA partially decomposed which causes the ZrO2 transformation to β-calcium phosphate(β-TCP).when sintering at 1 200℃,HA decomposed to α-calcium phosphate(α-TCP) and gave CaO,cubic phases ZrO2 (c-ZrO2) and yields CaZrO3.
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