Manufacturing & Prototyping

Designing for the DMLS Process

Direct Metal Laser Sintering is an emerging additive manufacturing technology that has great potential to change the way parts are manufactured.

Posted in: Tech Talks

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Aluminum Rocket Engine Injector Fabricated Using 3D Additive Manufacturing

Marshall Space Flight Center, Alabama Liquid rocket engine injectors can be extremely expensive to manufacture and hard to iterate to achieve high performance. Internal sealing points can also be the source of reliability issues. The technology disclosed here covers the application of a 3D additive manufacturing (AM) process to produce a functional aluminum injector for liquid propellant rocket engines, along with injector and overall engine design features that optimize the application of such processes to improve performance, reliability, and affordability relative to components produced using standard machining processes and designs. Aluminum was used for the injector instead of higher- temperature metals like stainless steel because its thermal conductance properties provide more opportunity to leverage the cooling potential of liquid oxygen and other cryogenic propellants.

Posted in: Briefs

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Making Flexible Ablators that are Flexible Char Formers

Ames Research Center, Moffett Field, California An approach was developed for making low-density, flexible ablators for a thermal protection system (TPS) from a flexible fibrous carbon substrate and a polymer resin. The material is foldable and stowable, and can be deployed in space without compromising performance. In addition, the material can be stowed in space for very long periods of time (years) without compromising deployability or performance. These flexible ablators offer an alternative to rigid TPS materials, thereby reducing design complexity and cost. On charring, the flexible ablative TPS retains its flexibility. After charring, the TPS has comparable flexibility and mechanical properties to the virgin material.

Posted in: Briefs

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Method for Providing Semiconductors Having Self-Aligned Ion Implant

Refined self-aligned ion implantation for improved SiC high-temperature transistors. John H. Glenn Research Center, Cleveland, Ohio This is a modification to technology for realizing durable and stable electrical functionality of high-temperature transistors. This modification is believed crucial to experimental implementation of SiC junction field effect transistors that electrically operated continuously at 500 °C for over 10,000 hours in an air ambient with less than 10% change in operational transistor parameters.

Posted in: Briefs

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Femtosecond Laser Processing of Metal and Plastics

Precision machining can be achieved with no thermal affects and minimal post-processing. Amada Miyachi America, Monrovia, California and Jenoptik, Jena, Germany While precise and fast, the down side to cutting with microsecond (ms) fiber lasers has been that the parts require a number of post-processing operations after they are cut, which add significantly to part cost, and can also damage mechanically delicate parts.

Posted in: Briefs

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Products of Tomorrow: June 2015

The technologies NASA develops don’t just blast off into space. They also improve our lives here on Earth. Life-saving search-and-rescue tools, implantable medical devices, advances in commercial aircraft safety, increased accuracy in weather forecasting, and the miniature cameras in our cellphones are just some of the examples of NASA-developed technology used in products today.

Posted in: Articles, Products

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Product of the Month: June 2015

Diversified Technical Systems, Seal Beach, CA, has introduced the SLICE Pro shock-hardened, mega-sample data acquisition system. The miniature SLICE data recorder can be mounted directly on the test article — no slip rings or telemetry are required. The recorder fits on virtually any moving or rotating part without altering test dynamics, and is rugged enough for extreme test environments. For applications like measuring torque on a drive shaft, SLICE mounts directly on the shaft next to the strain gauges. Each 3-channel “slice,” or layer, is modular and weighs less than 14 grams. The SLICE Pro is a complete solution with programmable sensor interface, adjustable filters, 16-bit ADC, and Ethernet communication. It features user-selectable sampling rates up to 1Msps/channel, data bandwidth options to 200 kHz, and supports full- and half-bridge sensors, strain gages, IEPE, voltage input, and thermocouples. Two software options, SLICEWare and DataPRO, enable users 6to enter sensor and sampling parameters, and the software automatically sets up the hardware. For Free Info Visit http://info.hotims.com/55590-120

Posted in: Products

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