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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

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At least 1,081 records · Page 60
All sourcesNASA NTRSDOE OSTI
DOE OSTI2017

Method For Production of Diamond Hardfaced Titanium Carbide/Titanium Bits For Geothermal Drilling

During Phase I, Diamond Materials, Inc. developed compositions and methodology to produce dense superhard D-TiC/Ti composites and performed feasibility studies to characterize structure, hardness, strength, toughness, thermal stability, corrosive wear and oxidation resistance for rock drilling and other applications. As expected multiple iterations were required to optimize the composition and microstructure of the D-TiC/Ti composite to achieve the desired super-hardness, drilling efficiency and high temperature corrosive-wear resistance. It is now experimentally established that D-TiC/Ti composites can be fabricated at much lower pressures and temperatures than D-WC/Co composites, thus manufacturing costs can be significantly reduced. It is also evident that this new process will enable large monolithic articles of superhard materials, including drill bits, to be made using conventional hot pressing equipment of very large working volume.

15 GEOTHERMAL ENERGY↗
DOE OSTI2024

Seismic Bracing Development for the Moore 3 Diamond Turning Machine at Lawrence Livermore National Laboratory

To allow for on-site Potassium Dihydrogen Phosphate (KDP) crystal finishing capabilities, Lawrence Livermore National Laboratory (LLNL) acquired the Moore 3 diamond turning machine. Equipment such as the Moore 3 is required by LLNL to have adequate seismic bracing before permanent installation to reduce the risk of personnel injury or machine damage during an earthquake. The purpose of this project was to design a bracket that can withstand seismic forces induced by the machine without hindering function. To develop a solution, background research—including stakeholder identification, stakeholder interviews, and a literature survey—was conducted. Based on LLNL site and stakeholder requirements, several approaches were developed for bracing the Moore 3. Ideations were evaluated based on a weighted decision matrix and a final design strategy was selected. This design was an L-shaped weldment that featured provisions for four HILTI concrete anchors, three triangular gussets, and a steel construction.

42 ENGINEERING↗
DOE OSTI2018

Drilling of Hard Rock by Means of Polycrystalline Diamond Inserts

A specialized measurement unit is developed to determine the basic parameters in the drilling of hard rock by bits with polycrystalline diamond inserts. The unit permits the collection of information and its wireless transfer to a computer.

36 MATERIALS SCIENCE↗
NASA NTRS1964

Ultraviolet optical properties of diamond.

Absolute reflection spectrum of type iia diamond at room temperatures from 4 to 30 ev, obtaining ultraviolet optical constants and complex dielectric constant

DIELECTRIC CONSTANT↗
NASA NTRS2011

Diamond Turned High Precision PIAA Optics and Four Mirror PIAA System for High Contrast Imaging of Exo-planets

Off-axis, high-sag PIAA optics for high contrast imaging present challenges in manufacturing and testing. With smaller form factors and consequently smaller surface deformations (< 80 microns), diamond turned fabrication of these mirrors becomes feasible. Though such a design reduces the system throughput, it still provides 2(lambda)D inner working angle. We report on the design, fabrication, measurements, and initial assessment of the novel PIAA optics in a coronagraph testbed. We also describe, for the first time, a four mirror PIAA coronagraph that relaxes apodizer requirements and significantly improves throughput while preserving the low-cost benefits.

coronagraphy↗