Surface modifications of Ti6Al4V by a picosecond Nd:YAG laser
Surface modifications of Ti6Al4V by a picosecond Nd:YAG laser
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DOI：
10.1017/s0263034609000123
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发表时间：
2009-03
影响因子：
0.9
通讯作者：
M. Trtica;B. Radak;B. Gaković;D. Milovanović;D. Batani;T. Desai
中科院分区：
文献类型：
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作者：
M. Trtica;B. Radak;B. Gaković;D. Milovanović;D. Batani;T. Desai
研究了工作波长为 1064 nm（23.6 J cm−2 通量）或 532 nm（25.9 J cm−2 通量）、脉冲持续时间为 40 ps 的 Nd:YAG 激光器与钛基医用植入物 Ti6Al4V 合金的相互作用。激光波长为 1064 nm 和 532 nm 时，表面损伤阈值估计分别为 0.9 J cm−2 和 0.25 J cm−2 。在这两种激光波长下，吸收的能量大部分转化为热能，形成凹坑，尽管 1064 nm 的凹坑比 532 nm 深约 50 倍。周期表面结构 (PSS) 也可以用两种激光波长形成，即微米级同心和径向（3 µm 至 15 µm 周期），纳米级平行（1064 nm 激光为 800 nm 周期，532 nm 激光为 400 nm）。在 532 nm 激光器的情况下，同心结构随着激光脉冲计数的累积而扩大其周期。这些特征有助于使种植体表面变粗糙并提高生物相容性。
Interaction of a Nd:YAG laser, operating at wavelengths of 1064 nm (23.6 J cm−2 fluence) or 532 nm (25.9 J cm−2 fluence), and pulse duration of 40 ps, with a titanium-based medical implant Ti6Al4V alloy was studied. Surface damage thresholds were estimated to be 0.9 J cm−2 and 0.25 J cm−2 at laser wavelengths 1064 nm and 532 nm, respectively. At both laser wavelengths, the energy absorbed was mostly converted into thermal energy, forming craters, albeit about 50 times deeper at 1064 nm than at 532 nm. Periodic surface structures (PSS) were also formed with both laser wavelengths, concentric, and radial at micrometer scale (3 µm to 15 µm period), parallel at nanometer scale (800 nm period with the 1064 nm laser, 400 nm with the 532 nm laser). In the case of the 532 nm laser, the concentric structures enlarge their period with accumulating laser pulse count. These features can help roughening of the implant surface and improve bio-compatibility.