Electrical/Electronics

Addendum of Self-Aligned Ion Implant to Design and Processing of SiC High-Temperature Transistors for Durable Operation Above 400 °C

Applications include aerospace, oil and gas combustion, well drilling, transportation, and computers.Researchers at NASA’s Glenn Research Center have developed a revolutionary new generation of silicon carbide (SiC) integrated circuit (IC) chips, setting an unprecedented benchmark in the field of high-temperature electronics. In the past, SiC ICs could not withstand more than a few hours of 500 °C temperatures before degrading or failing. Now, Glenn has successfully fabricated prototype chips that can exceed 10,000 hours of continuous operation at 500 °C. The advanced performance stems in part from the development of Glenn’s patented iridium interfacial stack (IrIS), a bondable metallization stack that prevents diffusion of oxygen and gold into silicon carbide (SiC) integrated circuits operating above 500 °C. The enhanced reliability of these components (and the transistors and logic boards they support) will enable important improvements in the control and operation of combustion engines, well-drilling, and other harsh environment systems, thereby greatly impacting operational efficiency and environmental quality. This advance in the manufacture of SiC-based electronics also fundamentally revolutionizes the opportunities for intelligent systems operating in high-temperature environments.

Posted in: Briefs, Electronics & Computers, Electronic control units, Integrated circuits, Silicon alloys, Thermal testing

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Method and Apparatus to Detect Wire Pathologies Near Crimped Connector

NASA’s Langley Research Center has created a collection of innovations for rapid, precise, and verified crimps. Wiring crimp failures can be a threat to safety and may lead to a loss of critical functions in high-risk applications, such as aerospace. In addition to the safety concerns, diagnosing and repairing poor crimp connections can be costly. Langley’s crimping innovations increase quality and reduce risk by using ultrasound to provide real-time, nondestructive verification of wire-crimp integrity while the crimp is being formed. This technology can be applied to electromechanical crimping machines, where the appropriate force required to form a crimped connection is determined in real time. Such an application prevents over- or under-crimping, and prevents excessive tool wear. Langley has also created a means and method to calibrate and verify the mechanical and electrical settings for an ultrasonically enhanced crimp tool.

Posted in: Briefs, Electronics & Computers, Failure analysis, Connectors and terminals, Wiring, Manufacturing equipment and machinery, Non-destructive tests

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Preventing Cell-to-Cell Thermal Runaway in Lithium-Ion Battery Modules

Lithium-ion (Li-ion) cells are increasingly used in high-voltage and high-capacity modules. The Li-ion chemistry has the highest energy density of all rechargeable battery chemistries, but associated with that energy is the issue of catastrophic thermal runaway with a fire. With recent incidents in the commercial aerospace and electronics sectors, it was necessary to find methods to prevent cell-to-cell thermal runaway propagation.

Posted in: Briefs, Batteries, Energy

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Stackable Form-Factor Peripheral Component Interconnect Device and Assembly

Applications include fault-tolerant computing systems, high-speed data acquisition, embedded servers, and intelligent transportation systems. The invention is a design for a peripheral component interconnect (PCI) local bus controller and target in a PC/104-Plus form-factor. The design uses a flash-based field programmable gate array (FPGA) to provide immediate functionality from power-on to avoid delay after power is applied. It can be reprogrammed from connectors directly on the board, and is able to both receive and drive the clock for system and local peripherals, allowing it to function as either a PCI bus host controller or PCI target device interface. Fully compliant with the PC/104-Plus specification, the design has associated schematics and Gerber files in a vendor-ready state. The design was developed to support ongoing research in fault-tolerant computing systems.

Posted in: Briefs, Electronics & Computers, Architecture, Communication protocols, Computer software and hardware

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Self-Healing Wire Insulation

Microcapsules release healant that repairs minor cuts, nicks, and abrasions. NASA’s Kennedy Space Center is seeking commercial partners for licensing or further development of a novel high-performance, flexible, low-melt polyimide film with self-healing properties. The self-healing properties of the film are provided by embedded microcapsules containing a solvent-soluble polyimide. When cut or otherwise damaged, these capsules release their contents, which dissolve and heal the damaged area.

Posted in: Briefs, Electronics & Computers, Wiring, Product development, Adhesives and sealants, Coatings, colorants, and finishes, Insulation, Polymers

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Vibration Damping Circuit Card Assembly

NASA’s Marshall Space Flight Center has developed a particle impact damper (NASA damper) that can be used in circuit card assemblies to reduce vibrations encountered during space vehicle launch. The damper, filled with high-density metallic beads, is attached to printed circuit boards (PCBs) and printed wiring assemblies (PWAs) to dissipate vibrations and improve component reliability and robustness. Testing has demonstrated an order-of-magnitude reduction in observed peak vibration response, and dramatic improvement in circuit component life span. The NASA technology provides simple and inexpensive vibration reduction for sensitive heritage or commercial off-the-shelf (COTS) electronics in applications where the vibration environment is either severe or exceeding its original design envelope. The technology can benefit heritage hardware in a wide range of applications as a retrofitted upgrade, or can be incorporated into the design of new circuit cards.

Posted in: Briefs, Electronics & Computers, Dampers and shock absorbers, Computer software and hardware, Vibration, Launch vehicles

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Development of a Metallic Bilayer Liftoff Mask

A large variety of cryogenic detectors need to be fabricated on thin dielectric membranes in order to have high signal-to-noise attributes. Unfortunately, many of the etching processes used to define the detectors can roughen or even completely dissolve the membranes. These types of membrane damage degrade the detector performance and limit fabrication yield.

Posted in: Briefs, Electronics & Computers, Sensors and actuators, Product development, Coatings, colorants, and finishes, Copper, Corrosion, Materials properties, Titanium

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