Abstract
New developments in additive manufacturing (AM) are enabling the use of 3D printed parts in increasingly demanding applications, such as in mechanical power transmission systems, where excellent build quality and tribological performance are required. The tribological properties of thermoplastic-based AM technologies are well knowninject, whereas the performance of photopolymer-based AM technologies is very rarely explored. This study aims to provide new insight into the tribological performance of 3D printed parts produced using vat photopolymerization (VPP). Photocurable resins based on aliphatic urethane acrylate oligomers were modified with different solid lubricants (polytetrafluoroethylene (PTFE), graphite and molybdenum disulfide (MoS2)) and 3D printed using Digital Light Processing (DLP). The mechanical and thermal properties were studied using the tensile tests, Charpy impact tests, Shore D, and dynamic mechanical analysis (DMA). The tribological performance was studied using a Pin-on-Disk tribometer. Among the lubricants, PTFE had the highest impact on the coefficient of friction (µ) and the specific wear rate (ws). The hybrid lubricant system (PTFE/MoS2) resulted in excellent tribological performance, where the µ was reduced by up to 52% and ws by up to 92%.
Highlights
In many mechanical devices, power needs to be transmitted, preferably as efficiently as possible, often over a wide range of conditions [1]
Since the first printed layers receive a larger dose of photons due to the long curing times and penetration of light during the curing of subsequent layers, the Double bond conversion (DBC) on this side of the specimen is usually higher
Building on our knowledge obtained from previous work, where we developed a system for tailoring mechanical and thermal properties of photocurable resins for resinsthe forresin
Summary
Power needs to be transmitted, preferably as efficiently as possible, often over a wide range of conditions [1]. The performance of the power transmission system is dependent on design and on the accuracy and surface finish of the individual components, and the mechanical, thermal, and tribological properties of the materials [3,4,5,6]. Both standards classify gears in different quality levels that can be placed into six major levels of accuracy [3,7]. Another important factor to consider is the material combination, which strongly depends on the application and operating boundary conditions
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