富氧气氛下切削纯钛表面氧化膜形成试验研究

Experimental Study on Surface Oxide Film Generation of Biomaterial Titanium in Oxygen-enriched Atmosphere

针对钛合金植入体表面活性氧化膜加工工艺链长的问题,提出在切削过程中利用切削热和富氧气氛生成氧化膜的方法,并进行试验研究。首先,从热力学角度对生成氧化钛的条件进行理论分析;然后对其中的关键因素切削温度进行模拟仿真,最后对生成的氧化膜进行显微观察和EDS分析。结果表明:富氧气氛下车削得到的工件表面相对于自然状态下工件的氧化程度明显增大,氧化膜增厚。

This paper proposed a new method to achieve oxide film on titanium alloy surface, which could overcome long processing chain in conventional method. The principle of this method was employing high cutting temperature during machining in an oxygen - rich atmosphere. The generation mechanism of titanium oxide was analyzed firstly with thermody- namic theory. Then the cutting temperature was simulated as an important factor. Finally, the microscopic observation and EDS （Energy -dispersive X- ray Spectroscopy） analysis were performed to understand oxide film generated during machi- ning process. The results showed that the oxidation degree of workpiece surface and thickness of oxide film during machi- ning in oxygen - rich atmosphere were significantly larger than that was machined in natural state.