Manufacturing & Prototyping

Loop Heat Pipe with Thermal Control Valve for Variable Thermal Link

The loop heat pipe is modulated without electrical power. Marshall Space Flight Center, Alabama Existing technologies [Loop Heat Pipe (LHP) and passive Thermal Control Valve (TCV)] are integrated and made to work together to provide a passive variable thermal link. The result is a novel LHP with passive TCV that was developed to provide variable heat rejection (turn-down) allowing efficient operation during periods of low dissipation and cold environments, as well as periods of peak loads and warm environments. The thermal control valve installed in the vapor line routes the vapor flow to the radiator during normal operation, or directly to the compensation chamber during periods of cold radiator sink temperatures or low power. The vapor bypassing the condenser cancels the circulation to the radiator, thereby minimizing heat transport and rejection.

Posted in: Briefs

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Surface Densification of Phenolic Impregnated Carbon Ablator

Ames Research Center, Moffett Field, California PICA (phenolic impregnated carbon ablator) was developed for the forebody heat shield of the Stardust Return Capsule. Conventional thermal protection system (TPS) materials of the time (primarily carbon phenolics) had high densities and thermal conductivities, yielding a TPS mass fraction that exceeded mission constraints. PICA was developed in the 1980s and consists of a rigid carbon fibrous substrate infiltrated with phenolic resin, yielding a TPS with good ablation and pyrolysis behavior. In addition, PICA has the advantages of low density coupled with efficient ablative capability at high heat fluxes. Limitations of PICA include relatively low mechanical properties, high recession rates, and poor handling, as the material sheds phenolic powder and is prone to damage from low-velocity impacts.

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Low-Density Flexible Ablators

Ames Research Center, Moffett Field, California NASA has developed a class of low-density, flexible ablators that can be fabricated into heat shields capable of being packaged, stowed, and deployed in space. Several flexible versions have been developed by infiltrating a pyrolyzing silicone resin into flexible, low-density felts made of carbon, polymer, or ceramic materials. The material is produced by immersing a flexible fibrous substrate in a diluted polymer resin, curing the polymer resin using heat and/or catalyst, and removing the solvent.

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Solar-Powered Carbon Dioxide Conversions with Thin-Film Devices

Ames Research Center, Moffett Field, California A nanomaterial thin-film device provides a low-cost, facile fabrication pathway to commercialize the technology to the sustainable energy market. Metal oxide thin films have been fabricated to a photoelectrochemical cell by solar energy. The prototype device uses both low energy cost for manufacturing and low materials cost for devices. The self-modulated device platform can also find other applications in sensors and detectors. The resultant prototype device can be deployed to the automobile industry or power plants with very low initial costs. The device can also be made extremely compact and efficient. It uses solar energy as the only power source.

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Fiber Metal Laminates Made by the VARTM Process

Fiber metal laminates combine the best properties of the metal and composite. Langley Research Center, Hampton, Virginia Fiber metal laminates (FMLs) are multicomponent materials utilizing metals, fibers, and matrix resins. Tailoring their properties is readily achievable by varying one or more of these components. Two new processes for manufacturing FMLs using vacuum assisted resin transfer molding (VARTM) have been developed.

Posted in: Briefs, TSP

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Method to Produce Copper Nanowires for Interconnect Applications

Ames Research Center, Moffett Field, California Copper replaced aluminum nearly two decades ago as interconnect material in integrated circuit manufacturing due to its better electrical conductivity. The size of the interconnect wire has been steadily decreasing as Moore’s law has been progressing through various feature size generations. The diameter of the interconnect structure is further expected to decrease as silicon technology is poised to march through a few more generations. Alternatives to copper have been reported—notably, materials such as carbon nanotubes. Their success has been limited, and carbon nanotubes have not been integrated into manufacturing practice.

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How to Turn Your Engineers Into Product Design Superheroes

Today's innovative companies are built on the shoulders of the engineering teams responsible for designing products. Smart companies invest in tools that translate into better products. A modern Product Lifecycle Management (PLM) solution removes tedious admin responsibilities, streamlines the design environment, and empowers engineers to collaborate more efficiently with other departments. In short, PLM enables engineers to make the organization more profitable by allowing them to spend more time focused on the task they do best: designing innovative, world-class products. In this whitepaper, we focus on how PLM empowers engineers to spend more time on product design by optimizing their relationship with the different departments across the organization with which they must interact.

Posted in: White Papers

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