Laser Processing of Multilayered Thermal Spray Coatings: Optimal Processing Parameters
| Autor: | Tao Zhang, Mahder Tewolde, Jon P. Longtin, Hwasoo Lee, Sanjay Sampath, David J. Hwang |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
0209 industrial biotechnology
Laser ablation Fabrication Materials science business.industry Scanning electron microscope 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics Laser Surfaces Coatings and Films law.invention 020901 industrial engineering & automation Thermoelectric generator law Feature (computer vision) Materials Chemistry Optoelectronics Laser power scaling 0210 nano-technology business Thermal spraying |
| Zdroj: | Journal of Thermal Spray Technology. 26:1994-2004 |
| ISSN: | 1544-1016 1059-9630 |
| DOI: | 10.1007/s11666-017-0657-z |
| Popis: | Laser processing offers an innovative approach for the fabrication and transformation of a wide range of materials. As a rapid, non-contact, and precision material removal technology, lasers are natural tools to process thermal spray coatings. Recently, a thermoelectric generator (TEG) was fabricated using thermal spray and laser processing. The TEG device represents a multilayer, multimaterial functional thermal spray structure, with laser processing serving an essential role in its fabrication. Several unique challenges are presented when processing such multilayer coatings, and the focus of this work is on the selection of laser processing parameters for optimal feature quality and device performance. A parametric study is carried out using three short-pulse lasers, where laser power, repetition rate and processing speed are varied to determine the laser parameters that result in high-quality features. The resulting laser patterns are characterized using optical and scanning electron microscopy, energy-dispersive x-ray spectroscopy, and electrical isolation tests between patterned regions. The underlying laser interaction and material removal mechanisms that affect the feature quality are discussed. Feature quality was found to improve both by using a multiscanning approach and an optional assist gas of air or nitrogen. Electrically isolated regions were also patterned in a cylindrical test specimen. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|