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Processing and Performance of Hydroxyapatite/Fluorapatite Double Layer Coating on Zirconia by the Powder Slurry Method
Author(s) -
Kim HaeWon,
Yoon ByungHo,
Koh YoungHag,
Kim HyounEe
Publication year - 2006
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2006.01114.x
Subject(s) - fluorapatite , slurry , materials science , layer (electronics) , coating , chemical engineering , substrate (aquarium) , cubic zirconia , ceramic , composite material , phosphate , apatite , chemistry , organic chemistry , oceanography , engineering , geology
A hydroxyapatite/fluorapatite (HA/FA) double layer was coated on ZrO 2 by a powder slurry method. The FA layer between the HA layer and the ZrO 2 substrate was effective in suppressing the reaction between HA and ZrO 2 . The rheological properties of the slurry and the thermal treatment conditions were optimized. Addition of small amounts of tri‐ethyl phosphate dispersant and polyvinylbutyral binder (up to 5 wt%) was effective in reducing the slurry viscosity, even at high loadings of HA powder. Each layer (HA, FA) was deposited on ZrO 2 repeatedly to induce a uniform layer, and the final heat treatment was carried out above 1200°C to consolidate the coating layer. During this process, without the FA‐intermediate layer, a severe reaction between HA and ZrO 2 occurred to form tri‐calcium phosphate and CaZrO 3 products. However, the presence of the FA layer between HA and ZrO 2 effectively suppressed the reaction up to 1300°C. The obtained HA/FA double coating layer was micro‐porous and relatively rough, but was firmly adhered to the ZrO 2 substrate, having a bonding strength of approximately 25 MPa after heat treatment above 1200°C. The osteoblast‐like cells cultured on the HA/FA coating layer spread and proliferated favorably, having a cell proliferation rate comparable to that of a plastic control and HA bulk ceramic.