Process modelling of thermal spraying for thermoset coatings
| Autor: | D.T. Gawne, Tao Zhang, Yuqing Bao |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
Materials science
General Chemical Engineering Organic Chemistry Gas dynamic cold spray Thermosetting polymer Epoxy engineering.material Surfaces Coatings and Films Coating visual_art Heat transfer Materials Chemistry engineering visual_art.visual_art_medium Deposition (phase transition) Infrared heater Composite material Thermal spraying |
| Zdroj: | Progress in Organic Coatings. 73:225-231 |
| ISSN: | 0300-9440 |
| DOI: | 10.1016/j.porgcoat.2011.11.006 |
| Popis: | Thermal spraying has the ability to coat large components and structures on site. It has been used to deposit thermoplastic coatings but little work has been done on thermosets. To form a thermoset coating by thermal spraying, the feedstock particles have to melt in the flame without degradation but also the coating itself must then be cured by the end of the deposition process. The particle residence time in a typical thermal-spray flame during deposition is less than 0.01 s, whereas conventional thermoset powders need orders of magnitude more time at the baking temperature to achieve a sufficient degree of cure. However, the freshly deposited coating also receives heat from the scanning flame during thermal-spray deposition, which should contribute to the curing process. This effect is complicated by the fact that the heat input during scanning varies with time. To control the curing process, therefore, a full understanding of the interaction between the flame, coating and substrate is essential. In this paper, experimental trials and computer simulations were carried out aimed at controlling the temperature profiles of the thermoset deposit to enable sufficient cure to take place. Software developed by the authors was used to simulate flame scanning and post heat treatment. Commercial software was also applied to simulate steady-state infrared heating. The results indicate that process parameters have a critical effect on the properties of the coatings and can be optimized with the aid of computer simulation. |
| Databáze: | OpenAIRE |
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