Fabrication of Hydroxyapatite Coatings by the Ball Impact Process
Fabrication of Hydroxyapatite Coatings by the Ball Impact Process
复制标题
通过球冲击工艺制备羟基磷灰石涂层
DOI：
10.1016/j.surfcoat.2012.03.066
复制
发表时间：
2012
影响因子：
5.4
通讯作者：
Eiki KASAI and Tatsuya OKI
中科院分区：
文献类型：
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作者：
Naohito HAYASHI;Shunkichi UENO;Sergey V. KOMAROV;Eiki KASAI and Tatsuya OKI
作者应用作者的研究小组开发的球冲击过程，在生物相容性金属如钛及其合金上制备羟基磷灰石（HAp）颗粒涂层。在此过程中，在环境温度、常压和标准空气气氛下，金属或陶瓷球通过机械振动被加速并反复冲击在金属表面上;同时，粉末颗粒被夹在球和表面之间。因此，金属表面被粉末颗粒迅速涂覆。采用ZrO_2振动室和ZrO_2球，经过几十分钟的热处理，成功地制备了覆盖率大于95%、厚度为50μm的高密度HAp颗粒涂层。通过改变球直径、处理时间和球填充分数等参数进行实验。结果表明，要获得高覆盖率、足够厚度的涂层，球径应大于5.0mm，处理时间应大于10 min。这是因为，在这些条件下，机械混合之间发生的Ti基板和HAp颗粒涂层在其界面处，并且这种现象被认为是提高粘附力。为了降低涂层的表面粗糙度，需要使用小球进行反复处理。
The authors applied the ball impact process, developed by the authors' research group, to fabricate hydroxyapatite (HAp) particle coatings on biocompatible metals such as Ti and its alloys. During this process, under ambient temperature, normal pressure, and in a standard air atmosphere, metal or ceramic balls are accelerated and impacted repeatedly on a metal surface by means of mechanical vibrations; simultaneously, powder particles are sandwiched between the balls and the surface. Consequently, the metal surface is rapidly coated with the powder particles. Using a ZrO2vibration chamber and ZrO2balls, the authors have successfully fabricated high-density HAp particle coatings with a cover ratio greater than 95% and a thickness of 50μm, after several tens of minutes of treatment. Experiments were conducted by varying the parameters such as ball diameter, treatment time, and ball filling fraction. The results revealed that the ball diameter should be greater than 5.0mm and the treatment time longer than 10min for the fabrication of coatings with high cover ratio and sufficient thickness. This is because, under these conditions, mechanical mixing occurs between the Ti substrate and HAp particle coatings at their interface, and this phenomenon is assumed to enhance adhesion. To decrease the surface roughness of the coatings, repeated treatments using small balls are required.