通过涂覆-烧结法在氧化铝(Al_2O_3)表面制得羟基磷灰石(HA)/氟羟基磷灰石(FHA)双层涂层,HA和FHA重复沉积在氧化铝基体上形成均匀涂层,然后在1300 ℃进行热处理.在此过程中,如果没有FHA中间层,HA会和Al_2O_3发生严重的反应,形成磷酸三钙和钙铝化合物.SEM、XRD及粘接拉伸试验表明:FHA中间层能有效地抑制HA与Al_2O_3的反应,所获得的双层涂层具有多孔粗糙的表面,但与Al_2O_3基体结合紧密.涂层经1300 ℃热处理后,其结合强度约为30 MPa.
A hydroxyapatite/hydroxyfluorapatite (HA/FHA) double layer was coated on Al_2O_3 by a powder slurry method. Each layer(HA,FHA) was deposited on Al_2O_3 repeatedly to induce a uniform layer and the final heat treatment was carried out above 1300 ℃ to consolidate the coating layer. During this process, without the FHA-intermediate layer, a severe reaction between HA and Al_2O_3 occurred to form tri-calcium phosphate and calcium aluminates. SEM, XRD and bonding tests of the coatings were performed. The results showed that the FHA layer between the HA layer and the Al_2O_3 substrate was effective in suppressing the reaction between HA and Al_2O_3.The obtained HA/FHA double coating was micro-porous and relatively rough, but was firmly adhered to the Al_2O_3 substrate, having a bonding strength of approximately 30 MPa after heat treatment above 1300 ℃.
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