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Gilroy, CA, United States

Holgate T.C.,Technical University of Denmark | Holgate T.C.,Teledyne Energy Systems, Inc. | Han L.,Technical University of Denmark | Wu N.,Technical University of Denmark | And 2 more authors.
Journal of Materials Research

Practical implementation of oxide thermoelectrics on an industrial or commercial scale for waste heat energy conversion requires the development of chemically stable interfaces between metal interconnects and oxide thermoelements that exhibit low electrical contact resistances. A commercially available high-chrome iron alloy (i.e., Crofer® 22 APU) serving as the interconnect metal was spray coated with LaNi0.6Fe0.4O3 (LNFO) or (Mn,Co)3O4 spinel and then interfaced with a p-type thermoelectric material-calcium cobaltate (Ca3Co4O9)-using spark plasma sintering. The interfaces have been characterized in terms of their thermal and electronic transport properties and chemical stability. With long-term exposure of the interfaced samples to 800 °C in air, the cobalt-manganese spinel acted as a diffusion barrier between the Ca3Co4O9 and the Crofer® 22 APU alloy resulting in improved interfacial stability compared to that of samples containing LNFO as a barrier layer, and especially those without any barrier. The initial area specific interfacial resistance of the Ca3Co4O9/(Mn,Co)3O4/Crofer® 22 APU interface at 800 °C was found to be ∼1 mΩ·cm2. Copyright © 2014 Materials Research Society. Source

Teledyne Energy Systems, Inc. | Date: 2005-07-26

Computer software for controlling, monitoring, and testing fuel cell equipment.

Teledyne Energy Systems, Inc. | Date: 2005-07-12

Feature of computer software for controlling, monitoring, and testing fuel cell equipment that provides quick access to fuel cell equipment operating information.

Holgate T.C.,Teledyne Energy Systems, Inc. | Bennett R.,Teledyne Energy Systems, Inc. | Hammel T.,Teledyne Energy Systems, Inc. | Caillat T.,Jet Propulsion Laboratory | And 2 more authors.
Journal of Electronic Materials

The National Aeronautics and Space Administration’s Mars Science Laboratory terrestrial rover, Curiosity, has recently completed its first Martian year (687 Earth days) during which it has provided a wealth of information and insight into the red planet’s atmosphere and geology. The success of this mission was made possible in part by the reliable electrical power provided by its onboard thermoelectric power source—the multi-mission radioisotope thermoelectric generator (MMRTG). In an effort to increase the output power and efficiency of these generators, a newly designed enhanced MMRTG (eMMRTG) that will utilize the more efficient skutterudite-based thermoelectric materials has been conceptualized and modeled, and is now being developed. A discussion of the motivations, modeling results and key design factors are presented and discussed. © 2014, The Minerals, Metals & Materials Society. Source

Otting W.,Aerojet Rocketdyne | Gard L.,Aerojet Rocketdyne | Hammel T.E.,Teledyne Energy Systems, Inc. | Bennett R.,Teledyne Energy Systems, Inc.
10th Annual International Energy Conversion Engineering Conference, IECEC 2012

The multi-mission Radioisotope Thermoelectric Generator (RTG), or MMRTG, was developed to be a workhorse unit for a variety of potential future missions. The MMRTG is capable of operating over a range of environments, from planetary atmosphere to the vacuum of space. The operating envelope spans a wide range of thermal environments providing the necessary flexibility to address a broad range of potential future missions. The high grade waste heat from MMRTG is ideal for thermal integration with the spacecraft, with the MMRTG providing both heat and electrical power to the spacecraft. The system is robust and will withstand very high launch and landing loads. The thermoelectric system is inherently radiation tolerant, making it ideal for the harshest space environments. The nuclear heat generator coupled with the solid state power conversion provides a simple, highly reliable, long life power system with no moving parts. The first use of the MMRTG is the Mars Science Laboratory (MSL) mission. The MMRTG is providing both heat and electrical power to the MSL rover, named Curiosity. The MMRTG went through a litany of tests and checkouts in preparation for the MSL mission. Initially, the MMRTG was tested as an ETG (Electrically Heated Thermoelectric Generator) to characterize the performance envelope and to ensure that the unit was acceptable to commit to fueling. Once fueled, the MMRTG went through a proto-flight acceptance test series including vibration, magnetic, thermal vacuum, and mass properties testing. These tests confirmed that the unit was acceptable for the MSL mission prior to shipping the unit to Kennedy Space Center (KSC). Once at KSC, the MMRTG underwent fit checks and final performance measurements prior to final integration with the spacecraft at the Vertical Integration Facility located at Launch Complex 41. The system was successfully launched on November 26th, 2011 and is currently in transit to Mars. © 2012 by Pratt & Whitney Rocketdyne. Source

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