Spacecraft Sporting the Hottest Thermal Protection Systems

An increase in commercial flights and the moving away from government operations, is resulting in a rising interest in thermal protection systems for spacecraft. IDTechEx's portfolio of Thermal Management Research Reports and Subscriptions is home to not only research into space tech, but a diverse array of other vehicle types and their specific thermal protection technologies.

 

 

Despite being a more niche sector than that of thermal management for more common vehicles, thermal protection systems (TPS) for spacecraft sees some of the most intriguing and complex technologies coming into play, to provide effective solutions to operations resulting in some of the hottest temperatures. IDTechEx's report, "Heat Shields & Thermal Protection Systems for Spacecraft 2025-2035: Technologies and Market Outlook", deep dives into the origins of demand for this technology, as well as the materials and techniques utilized for the most effective and efficient management.

 

Reaching unmatched temperatures as a result of the immense kinetic energy generated from flight, means that spacecraft TPS increasingly require innovation and the introduction of new types of systems that are specifically designed to cater to these applications. IDTechEx provides information on developments that have occurred over the past decade and beyond, with a focus on some of the most well-known expeditions and spacecraft for companies such as NASA and SpaceX.

 

Thermal protection systems for spacecraft can be categorized into passive and ablative. Passive TPS focus more on preventative techniques, such as employing materials outside the spacecraft to prevent the main body from overheating, while ablative systems are reported by IDTechEx to be the only viable option for planetary entry and far distance re-entry to Earth. This approach works as materials are ablated into a gas which can then absorb excess heat energy.

 

 

Aerobraking is a common approach for lowering spacecraft speeds on the way back to earth in order to safely land. This method sees the drag created by blunt-body impact on the upper atmosphere being utilized to slow down, resultantly turning kinetic energy into heat. Expandable, ablative, and reusable TPS are the three main aerobraking types outlined by IDTechEx.

 

Expandable TPS would see the adoption of either mechanically expanded or gas inflated systems to increase the spacecraft's overall surface area to reduce heat loads. However, IDTechEx reports that using ablators in ablative TPS is the only proven option past a specific heat flux, with these systems therefore being used for missions including far solar system return or Gas Giant entry, for example.

 

Reusable TPS include the use of silica tiles that are known for their low density and low conductivity while providing thermal insulation. These tiles are likely to be seen placed across the leading edges and nose of a spacecraft, where a greater amount of heat is generated. Special coatings for these tiles can also increase emissivity. The need for heat to remain outside of the spacecraft and to not be transferred in is also one of the main purposes of reusable TPS, while low weight for launching is also a necessary consideration.

 

Another possibility for slowing down spacecraft for safe landing includes firing retrograde rockets. However, with the need to carry additional fuel, this method is presented as an option for moon landings where there is no atmosphere and otherwise considered a potential misplacement of resources due to the extra costs and weight.

 

Visit IDTechEx's portfolio of Thermal Management Research Reports and Subscriptions for coverage of the diverse thermal management sector, including applications spanning not just spacecraft, but electric vehicles, data centers, and battery energy storage systems.