Revolutionary HX5 Replaces Aluminum At Half the Weight (excerpt)
(Source: American Military News; posted May 20, 2020)
Imagine if there was a product developed through years of effort and funding by one of the most advanced companies in the world, which could save billions in costs and CO2 emissions each year by replacing one of the most common metals in the world. Now imagine if that product continued to go unused for years.

Each year, hundreds of millions if not billions of internal research and development dollars go into developing concept technologies for the military and many of those technologies never result in an end product in the defense market. In 2014, Catalyze Dallas launched as one company hoping to turn those unused defense concepts into working products for public and private consumer markets.

Through a subsidiary company called Alpine Advanced Materials, Catalyze Dallas turned one of those unused defense concepts, HX5 thermoplastic, into a product with thousands of potential applications. The company touts HX5’s ability to replace aerospace-grade aluminum while maintaining 90 percent of aluminum’s strength and shockingly, at 50% the weight. Beyond the simple weight reduction, HX5 can withstand extreme temperatures and corrosion and has even proven resilient in the vacuum of outer space.

The concept for the advanced thermoplastic was first born out of the needs of the advanced F-35 Joint Strike Fighter program. While not the first aircraft to employ carbon fiber parts, the F-35 employed carbon fiber to such a large degree that it birthed a need for new materials that could fit with different components without experiencing galvanic corrosion or dangerous thermal differences between materials.

Lockheed Martin found traditional aircraft aluminum combined with the aircraft’s carbon fiber could experience galvanic corrosion and warping due to heat. (end of excerpt)


Click here for the full story, on the AMN website.

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A New Composite to Protect Against Impact and Fatigue
(Source: Alpine Advanced Materials; issued July 22, 2019)
Among the many performance challenges faced by the aerospace industry, the impact strength of materials is a major concern. This property is of special importance because of the potentially catastrophic structural damage that can occur when aircraft collide with other objects – including such natural phenomena as hail – at high speeds.

Impact strength is the ability for the material to absorb energy, allow the deacceleration of the projectile without breaking. Once the force/load is released it returns to its original shape and size.

Almost as important as impact resistance is fatigue resistance. Fatigue occurs when a component is subjected to repeated force, which results in the structure no longer being able to withstand its intended force capability. This often begins with microscopic, small cracks or change in dimensions where even visual inspection may not be detectable. Fatigue damage is non-reversible and may be influenced by a variety of factors, including temperature, surface finish, metallurgical microstructure, residual stresses, and a number of other variables and parameters.

Impact and fatigue resistance have important ramifications in regard to maintenance, safety, and replacement.

Maintenance
Structural materials with high fatigue resistance can substantially decrease maintenance costs over time. This was conclusively demonstrated in a five-year full-scale fatigue test performed by Boeing on their 787 Dreamliner. This was the first study of its kind ever conducted on a primarily composite-built airliner, and it was the most comprehensive fatigue test performed by Boeing on any commercial transport vehicle.

Safety
The importance of high impact- strength materials with regards to safety is obvious. Composites that can absorb a large amount of energy help mitigate the damage from both normal and unexpected impacts, protecting passengers and improving survival rates in worst-case scenarios.

Fatigue resistance, especially in conjunction with critical thermal performances such as thermal stability, flame resistance, toxicity, and heat release – can help minimize injuries caused by fires. This is especially important in commercial airline applications and for rotorcraft fleets.

HX5: A Cutting-Edge Nanocomposite Approved by NASA and DoD
HX5 is an advanced thermoplastic nanocomposite that is reinforced with low-density carbon filaments that add strength, stiffness and dimensional stability. It has 90% of the tensile strength of 6061 aluminum at just half the weight per unit volume. HX5 is highly resistant to intense heat, corrosive liquids and gases, and meets or exceeds flammability, smoke density and toxicity requirements.

In creep rupture and fatigue performance tests performed at a range of temperatures and stress levels, HX5 demonstrated exceptional resistance to both rupture and fatigue. Moreover, HX5 passed a military 16g crash test, making it potentially suitable for use in airline interiors.

Tests after tests, HX5 has demonstrated its ability to withstand the most demanding environments, and its superiority for aerospace, space and military applications. To date, it has been certified for use in jet fighters, high-speed helicopters, UAVs, amphibious transport vehicles, missiles, rockets and satellites. HX5 is an exceptional alternative to machined aluminum in nearly every application, offering equal or better performance at half the weight.


Complete HX5 technical specs, including creep rupture and fatigue performance test results, can be downloaded here.

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