近年來，可降解材料的生醫骨釘及縫合鉚釘等骨科植入物，相當的受矚目，尤其是鎂基金屬玻璃，因為與其他傳統生醫材料或是鎂合金相比，其具有良好的機械性能、與人體骨骼相似的楊氏係數、良好生物相容性。金屬玻璃的特點是非結晶結構且沒有晶界，可以有效降低材料的分解速率，因此適合當作骨科植入物。鑒於前人的研究，鎂基金屬玻璃由於缺乏韌性的特性影響了後續加工與應用，因此，本研究將鎂基金屬玻璃以薄膜形式鍍覆在ZK60基材表面來改善機械性質、抗腐蝕性和生物相容性。 結果顯示利用直流真空濺鍍機可成功將鎂基金屬玻璃鍍膜鍍附於ZK60上，鍍覆的鎂基金屬玻璃薄膜結構仍維持非晶態，且根據膠帶附著力測試結果顯示，鎂基金屬玻璃薄膜之附著力為5B (0 % 的薄膜從基材上剝落)，透過奈米壓痕測試，可以得知鎂基金屬玻璃薄膜的硬度為240 Hv (約為ZK60的2倍)；藉由三點抗彎試驗可以觀察到，膜厚1000 nm鎂基金屬玻璃鍍層能有效提升抗彎強度，其抗彎強度可以從ZK60基材216 MPa提升至254 MPa，由此推論，鎂基金屬玻璃硬度較高，因此能提升抗彎強度，而在不同功率下膜厚1000 nm鎂基金屬玻璃鍍層，具有相同的抗彎強度。另外透過電化學腐蝕試驗(動態極化曲線)可得到功率30W的鎂基金屬玻璃薄膜有最好的抗腐蝕能力，其腐蝕電流為1.51 × 10-7 A/cm2是ZK60的4.88 × 10-6 A/cm2的 3/100，相對的大大提升了抗腐蝕能力，另外在功率30W的鎂基金屬玻璃薄膜可以發現有較大的鈍化區，因此，由電化學腐蝕試驗的結果可看出鎂基金屬玻璃薄膜可以提供保護ZK60基材更優越的耐腐蝕性。 ;In recent years, biomedical bone nails and suture rivets and other orthopedic implants made of biodegradable materials have attracted considerable attention, especially magnesium-based metallic glass. Because Mg-based metallic glass has good mechanical properties, similar Young′s modulus to human bones, and good biocompatibility compared with the other traditional biomedical materials or magnesium alloys. Bulk metallic glass material has no grain boundaries which can decrease the degradation rate of the implant material in comparison with Mg alloys and suitable for orthopedic implants. However, the metallic glass is lack of toughness limited the workability via machining and application. Therefore, this study chooses magnesium alloy ZK60 as the base material. The ZK60 plates coated with 1000 nm metallic glass thin film (MGTF) by DC-sputtering to improve the mechanical properties, corrosion resistance and biocompatibility. The results show that the structure of the coated Mg-based MGTF is amorphous state by DC-sputtering. According to the tape adhesion test results, the adhesion of the Mg-based MGTF is 5B class (0% of the film peels off the base material). Through the Nanoindentation test, it can be observed that the hardness of the Mg-based MGTF is 240 Hv (about twice that of ZK60). The results of 3-point bending test show that the Mg-based MGTF can effectively improve the bending strength. When the thin film thickness is about 1000 nm, the bending strength can be increased from 216 MPa to 254 MPa compare with the ZK60 base materials. Because MGTF has a higher hardness, it can increase the bending strength. And the Mg-based MGTF thickness of 1000 nm under different powers has the same bending strength. In addition, through the electrochemical corrosion test (dynamic polarization curve), the 30W Mg-based MGTF has the best corrosion resistance, and its corrosion current is 1.51 × 10-7 A/cm2 relative to ZK60′s 4.88 × 10-6 A/cm2 is about 3/100 times. When corrosion occurs, the corrosion rate will be much smaller than that of ZK60, and the 30W Mg-based MGTF can find a larger passivation area. The results of the electrochemical corrosion test show that the Mg-based MGTF can provide better corrosion resistance to protect the ZK60 substrate.
