Abstract
This paper reports on the use of Zr-based (Zr53Cu33Al9Ta5) thin film metallic glass (TFMG) for the coating of syringe needles and compares the results with those obtained using titanium nitride and pure titanium coatings. TFMG coatings were shown to reduce insertion forces by ∼66% and retraction forces by ∼72%, when tested using polyurethane rubber block. The benefits of TFMG-coated needles were also observed when tested using muscle tissue from pigs. In nano-scratch tests, the TFMG coatings achieved a coefficient of friction (COF) of just ∼0.05, which is about one order of magnitude lower than those of other coatings. Finite-element modeling also indicates a significant reduction in injection and retraction forces. The COF can be attributed to the absence of grain boundaries in the TFMG coating as well as a smooth surface morphology and low surface free energy.
Highlights
This paper reports on the use of Zr-based (Zr53Cu33Al9Ta5) thin film metallic glass (TFMG) for the coating of syringe needles and compares the results with those obtained using titanium nitride and pure titanium coatings
Diamond-like carbon (DLC) coatings have been applied in biomedical applications, to take advantage of their exceptionally low friction properties and biocompatibility[5]
In the XRD patterns, a broad hump in the 2 theta range from 30 to 50° indicates the amorphous structure of TFMG without obvious crystalline Bragg peaks
Summary
The glass transformation temperature (Tg) and crystallization temperature (TX) of Zr53Cu33Al9Ta5 TFMG were measured at 467.9 and 519.8 °C, respectively. In the XRD patterns, a broad hump in the 2 theta range from 30 to 50° indicates the amorphous structure of TFMG without obvious crystalline Bragg peaks. The diffraction patterns of Ti revealed three characteristic Bragg peaks associated with orientations of (110), (200), and (211), according to JCPDS#89-4913 standards. Peaks were detected at 36.6° and 42.5° for (111) and (200) planes in the TiN (JCPDS#65-5759). Three strong Bragg peaks for (111), (200) and (220)γ-Fe (austenite) and one peak for (100)α-Fe (ferrite) were detected in the bare samples. As indicated by the load vs displacement curve, (using PU), the forces associated with the insertion/ As indicated by the load vs. displacement curve in Fig. 2(a), (using PU), the forces associated with the insertion/
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