Keyword: Refractory materials

Briefs: Nanotechnology
The stretchable sensor has applications in environmental monitoring and healthcare.
Briefs: Imaging
Applications include terahertz medical imaging and communications.
Briefs: Imaging
See how tantalum disulfide is supporting new kinds of optics, and potentially new kinds of application for VR and self-driving cars.
Briefs: Propulsion
Green Monopropellant Secondary Payload Propulsion System

Small satellites, launched as secondary payloads, are increasingly being fielded. Advances in liquid rocket propulsion that enhance the on-orbit maneuverability, increase the on-orbit life, and decrease the time between identified need for and deployment of such spacecraft are of great...

Briefs: Materials
Innovative, Low-CTE, Lightweight Structures with Higher Strength

A series of lightweight (density below 2.0 gm/cm3) composites has been manufactured that have controllable properties. The core composite has been improved to provide higher strength (similar to aluminum), extremely low density, receptivity to exterior coatings, and...

Briefs: Manufacturing & Prototyping
Advanced Materials and Fabrication Techniques for the Orion Attitude Control Motor

Rhenium, with its high melting temperature, excellent elevated temperature properties, and lack of a ductile-to-brittle transition temperature (DBTT), is ideally suited for the hot gas components of the ACM (Attitude Control Motor), and other hightemperature...

Briefs: Information Technology
Estimating Foreign-Object- Debris Density From Photogrammetry Data

Within the first few seconds after launch of STS-124, debris traveling vertically near the vehicle was captured on two 16-mm film cameras surrounding the launch pad. One particular piece of debris caught the attention of engineers investigating the release of the flame trench...

Briefs: Mechanical & Fluid Systems
Improved Rare-Earth Emitter Hollow Cathode

An improvement has been made to the design of the hollow cathode geometry that was created for the rare-earth electron emitter described in “Compact Rare Earth Emitter Hollow Cathode” (NPO-44923), NASA Tech Briefs, Vol. 34, No. 3 (March 2010), p. 52. The original interior assembly was made entirely...

Briefs: Materials

An experimental investigation has shown that by (1) vacuum plasma spraying (VPS) of suitable refractory metal alloys on graphite mandrels, and then (2) heat-treating the VPS alloy...

Briefs: Manufacturing & Prototyping

A curved tile of refractory silica-fiber-based or alumina-fiber-based thermal-insulation material can be formed from an initially flat billet in a process that includes pressing...

Briefs: Photonics/Optics
Selective Metallization for High-Temperature Semiconductors

Inventors at the Cornell Research Foundation have devised a method of selective metallization of high-temperature semiconductors to produce ohmic or rectifying contacts. The process consists of three phases: a lithographic step to define the areas of contact, preparation of the...

Briefs: Manufacturing & Prototyping

Vacuum plasma spraying (VPS) has been demonstrated to be an effective technique for the fabrication of refractory-metal components of solar-thermal engines. Heretofore, such...