等离子喷涂羟基磷灰石涂层的体外性质研究

THE CHARACTERISITICS OF PLASMA-SPRAYED COATINGS OF HYDROXY APATITE IN VITRO

为了解羟基磷灰石（ＨＡ）涂层材料的稳定性，将等离子喷涂的ＨＡ涂层分别经过：①０．１５ＭＰａ，１２５℃的水蒸汽中保温６小时；②在空气中加热至６５０℃保温３０分钟；③在０．０１ＭＰａ，４９０℃的水蒸汽中保温２小时。结果显示：水蒸汽的存在能大大降低非晶相向结晶相的转变温度，并能促进其它的磷酸钙杂相向ＨＡ转变。经ＴｒｉｓＨＣｌ缓冲液的溶解实验显示：经水蒸汽处理后的ＨＡ涂层的稳定性大大高于加热处理后的ＨＡ涂层。认为，适当提高水蒸汽的处理温度能促进相变反应，缩短处理时间。

In order to investigate the stability of Hydroxyapatite (HA) coated material, the plasmasprayed coatings of HA were divided into four groups: ① keeping in water vapour at 125℃, with a pressure of 0.15 MPa for 6 hr; ② heating at 650℃ in air for half an hr; ③ keeping in water vapour at 490℃, with a pressure of 0.01 MPa for 2 hr; and ④ the control. The XRD, FTIR analysis and the dissolution test were carried out. The results showed: ①the degree of crystalization in XRD analysis was ③>①>②>④;②the ampitude of OH- peak in FTIR analysis was ③>①>②>④ and ③the dissolution rate in tris-HCl buffer was ③<①<②<④. The conclusions were ①the treating with water vapour could decrease the transformation temperature which was needed to convert the amorphous phase into cystalline phase; ②water vapour treatment could accelerate the transformation of Z-TCP, TCPM into crystalline HA; ③water vapour treatment could promote the structural integrity of plasma-sprayed coated of and HA and ④water vapour treatment could lower the dissolution rate of HA coated in Tris-HCl buffer.