由于其在工业中的广泛适用性,在材料表面设计微结构可以很容易地实现和自动化的技术过程。激光表面纹理(LST)用于改变化学成分,形态学,和表面粗糙度(润湿性),清洁(去除污染物),减少金属的内应力(硬化,回火),表面能(聚合物,金属),增加附着力(混合连接,生物工程)和减少病原菌的生长(生物工程)。本文是我们先前在激光辅助表面纹理化方面研究的延续和扩展。三种不同的模式(火山口阵列-C型,用纳秒脉冲激光(活性介质Nd:光纤二极管泵浦)在铁素体不锈钢(AISI430)的表面上施加了两个90°重叠的椭圆,其镜面B型和3个同心八边形A型)。对材料表面进行微纹理化可以改变其润湿性能。获得疏水性表面(接触角大于90°),其具有取决于参数的不同变化。本研究中进行的分析(表面粗糙度,润湿性)对于评估表面功能至关重要,LST工艺后不锈钢表面的特性和性能。表面粗糙度和接触角的值与重复次数成正比,与速度成反比。还提出了使用不同纹理图案设计的建议。
Due to its wide applicability in industry, devising microstructures on the surface of materials can be easily implemented and automated in technological processes. Laser Surface Texturing (LST) is applied to modify the chemical composition, morphology, and roughness of surfaces (wettability), cleaning (remove contaminants), reducing internal stresses of metals (hardening, tempering), surface energy (polymers, metals), increasing the adhesion (hybrid joining, bioengineering) and decreasing the growth of pathogenic bacteria (bioengineering). This paper is a continuation and extension of our previous studies in laser-assisted texturing of surfaces. Three different patterns (crater array-type C, two ellipses at 90° overlapping with its mirror-type B and 3 concentric octagons-type A) were applied with a nanosecond pulsed laser (active medium Nd: Fiber Diode-pumped) on the surface of a ferritic stainless steel (AISI 430). Micro texturing the surface of a material can modify its wettability behavior. A hydrophobic surface (contact angle greater than 90°) was obtained with different variations depending on the parameters. The analysis performed in this research (surface roughness, wettability) is critical for assessing the surface functionality, characteristics and properties of the stainless steel surface after the LST process. The values of the surface roughness and the contact angle are directly proportional to the number of repetitions and inversely proportional to the speed. Recommendations for the use of different texturing pattern designs are also made.