研究目的
Investigating the fabrication of surface patterns for wettability modification on a Zr-based bulk metallic glass by nanosecond laser surface texturing.
研究成果
The obtained results confirm that surface wettability can be modified intentionally by laser texturing depending on the generated surface patterns and selected process parameters. The hydrophilicity of the as-cast Vitreloy 105 surface could be enhanced by texturing groove patterns, attributed to the dominant role that a much higher roughness plays for such patterns. In contrast, the hydrophilicity of the as-cast surface was generally deteriorated with the laser texturing of dimple patterns, attributed to the more dominant role that surface chemistry modification plays in this case.
研究不足
The study is limited to a specific type of material (Zr-based bulk metallic glass) and two types of surface patterns (dimples and grooves). The effects of other types of patterns or materials are not explored. Additionally, the study focuses on static contact angle measurements, and dynamic contact angle measurements could not be performed due to the size limitation of the samples.
1：Experimental Design and Method Selection:
Nanosecond pulsed laser processing was employed to texture two types of surface patterns, i.e. dimples and grooves, on the surface of a Zr-based bulk metallic glass (BMG) known as Vitreloy 105. The specific focus was on understanding the role played by both surface topography and chemistry modifications in changing the wettability of the original surface.
2：The specific focus was on understanding the role played by both surface topography and chemistry modifications in changing the wettability of the original surface.
Sample Selection and Data Sources:
2. Sample Selection and Data Sources: The Zr-based BMG Vitreloy 105 with nominal composition Zr52.8Cu17.6Ni14.8Al9.9Ti4.9 (at.%) was chosen for this investigation. The as-received master ingots were first cut into disks with a thickness of 3 mm using wire electrical discharge machining (EDM).
3：8Cu6Ni8Al9Ti9 (at.%) was chosen for this investigation. The as-received master ingots were first cut into disks with a thickness of 3 mm using wire electrical discharge machining (EDM).
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: A 20 W pulsed Yb-doped fibre laser system (from SPI Lasers, UK) was used for laser processing. The surface topography of the specimens before and after laser surface texturing was examined by a non-contact three-dimensional surface profiler (Smart Series, Sensofar, Barcelona, Spain).
4：Experimental Procedures and Operational Workflow:
The laser beam was focused by a 100 mm focal lens with an incident angle perpendicular to the surface of the samples. Two kinds of structures, i.e. dimples and grooves, were fabricated on the surface of the specimens via programming the motion of a computer-controlled three-axis platform.
5：Data Analysis Methods:
Static contact angle (SCA) values were recorded for the different surface patterns using a contact angle goniometer (DataPhysics OCA100, DataPhysics, Germany) together with a camera-based optical measurement system. The surface free energy (SFE) value of all the samples was also assessed via the Owens-Wendt-Rabel-Kaeble (OWRK) method.
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