Chromatic 3D Materials, an American firm, has reported successful trials of rocket propellant produced via 3D printing. The tests occurred at the IS4S test site in Alabama: during a static fire test, the material withstood pressures exceeding 1800 psi (approximately 124 atmospheres) without structural failure.
The foundation of this innovation is the Reactive Extrusion Additive Manufacturing (RX-AM) technology. This process enables the printing of propellant in a liquid state, followed by nearly instantaneous solidification. Contrasting with conventional solid rocket charge manufacturing—where a mixture is first poured into a mold and then subjected to lengthy drying and curing periods—this novel method substantially streamlines operations. It eliminates the need for intricate tooling, protracted post-processing, and specialized core mandrels that typically constrain propellant geometry.
A key benefit of the technology is directly linked to the internal contour of the propellant grain channel. This geometry dictates the burning rate of the charge and the thrust output capabilities of the engine. Employing 3D printing allows for the creation of more elaborate and precise geometries that are challenging or simply unattainable through conventional means. Consequently, this unlocks potential for finer-tuning engine performance, reducing structural weight, and expediting manufacturing timelines.
Chromatic emphasizes that the company did not invent a fundamentally new propellant but rather modified existing formulations to suit their proprietary printing methodology. The developers anticipate this strategy will find applications not only in the space sector but also within the defense industry.
Company CEO Cora Leibig believes that additive manufacturing offers tangible benefits for a significant portion of America’s rocket systems and, ultimately, can pave the way for developing engines with greater power and extended range.
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