Case Study: Adhesive Utilized by NASA in Lunar Exploration Vehicles

Overview

The white paper discusses the use of Master Bond's EP30HT-LO epoxy, specifically its silver-doped variant, in NASA's research on titanium-water thermosyphons for lunar and Mars exploration vehicles. EP30HT-LO is a moderate-viscosity, two-component epoxy that can cure at room temperature or elevated temperatures, bonding effectively to various substrates, including metals, composites, and plastics. It meets NASA's low outgassing specifications, making it suitable for space applications.

The research focuses on the challenges posed by gamma radiation exposure on thermosyphons, which are essential for dissipating heat generated by fission power systems in spacecraft. These thermosyphons are embedded in radiator panels and are crucial for maintaining optimal operating temperatures. However, the radiolytic decomposition of water within the thermosyphons can produce non-condensable gases, potentially impairing their cooling performance.

To investigate this issue, researchers at NASA Glenn Research Center conducted an accelerated radiation experiment simulating eight years of gamma radiation exposure. They used silver-doped EP30HT-LO to bond the thermosyphons to graphite substrates and composite cooling fins. The results indicated that the epoxy maintained its bonding performance even under high doses of gamma radiation, with minimal formation of non-condensable gases observed during the experiment.

The findings suggest that silver-doped EP30HT-LO is durable and effective for bonding components in high-radiation environments, ensuring the reliability of thermosyphon performance. The study highlights the importance of this epoxy in the development of advanced thermal management systems for future space missions, demonstrating its potential to withstand harsh conditions while maintaining structural integrity.

In summary, the white paper emphasizes the critical role of EP30HT-LO in enhancing the performance and reliability of thermal systems in spacecraft, paving the way for successful exploration missions to the moon and Mars.