Materials & Manufacturing

Materials & Coatings

Access the technical resources for a range of materials and coatings. Design engineers can browse news, technical briefs, and applications for plastics, composites, rubbers, elastomers, and metals.

Briefs: Materials
Separating Ethanol From Water Via Differential Miscibility

The differential miscibility of castor oil in ethanol and water would be exploited to separate ethanol from water, according to a proposal. Burning the separated ethanol would produce more energy than would be consumed in the separation process. In contrast, the separation of a small...

A process for the fabrication of a polycrystalline diamond membrane involves chemical vapor deposition (CVD) of diamond onto a silicon substrate, followed by conventional...

Briefs: Materials
Separating Ethanol From Water Via Differential Solubility

The differential solubility of sulfur in ethanol and water could be exploited to separate ethanol from water. The energy that could be produced by burning the separated ethanol would be more than that required in the separation process. In contrast, the separation of a small amount of...

Flexible thermal-insulation blankets made of ceramic fibers can be protected against weather and handling by attaching thin metal face sheets. In applications in which the blankets are exposed to...

Improved aerogel-based thermal insulation systems have been developed to provide cost-effective and easier-to-handle alternatives to various types of multilayer insulation (MLI) and...

Improved polymer electrolyte membranes for direct methanol fuel cells can be made by any of a variety of processes in which cross-linked polystyrene sulfonic acid (PSSA) is...

Improved zirconium- and hafnium-based ceramic composites have been invented in an effort to obtain better resistance to ablation at high temperature. These ceramics are suitable for use...

Briefs: Materials
Hybrid Composite Overwraps for Low-Pressure Tanks

Hybrid versions of the high-performance overwraps used on some low-pressure tanks have been proposed. The hybrid overwraps would weigh less than do the corresponding nonhybrid overwraps, as explained below.

Briefs: Materials
Repair of Composite-Overwrapped Pressure Vessels

Pressure vessels overwrapped with graphite-fiber-based composite materials that become damaged would be salvaged by a proposed repair technique. The need for the technique arises as follows: High-performance graphite-fiber-based composites are very susceptible to damage from impact or cutting....

Briefs: Materials
Properties of Cubic Boron Nitride Films

A report describes an experimental study of the surface-chemical, microstructural, and tribological properties of cubic boron nitride (c-BN) films, which are potentially useful as hard, wear-resistant coatings on bearings and on steel-cutting tools. For the experiments, BN films about 500 nm thick were...

Briefs: Materials
Polymeric Composite Damage Protective Overwraps for Composite Pressure Vessels

Damage-tolerant polymeric composite overwraps have been proposed for lightweight pressure vessels that are made of composites of graphite fibers in polymeric matrices. Graphite-fiber/polymer composites are vulnerable to impact damage; overwraps on the pressure...

Continuing efforts to develop lightweight, flexible thermal-insulation blankets that withstand high temperatures have led to design and fabrication concepts that effect the following...

An improved method of fabricating membrane electrode structures for methanol fuel cells is similar to the method described in the preceding article, except that in this method, the...

Electric arcs and electrochemical etching can be used to impart microscopic textures to surfaces of metals. In electric-arc texturing, one strikes an arc between a water-cooled...

Doping with silver bromide has been found to be an effective technique for enhancing the optical homogeneity and other qualities of single crystals of lead bromide. These crystals are grown...

A method of fabricating membrane electrode structures for methanol fuel cells involves, among other things, the use of improved sprayers to deposit inks containing catalytic metals...

Polyimides have been used widely in fiber-reinforced composite materials for aerospace components and in thin films for packaging of electronic circuitry. Typically, the synthesis of a...

A process that involves reaction bonding makes it possible to form strong joints, with tailorable thicknesses and compositions, between high-temperature-resistant structural parts...

Briefs: Materials
Diffusing Hf and Si Into Aluminide Bond Coats for TBCs

A process for making superior diffusion platinum-aluminide bond coats for plasma-sprayed or physical-vapor-deposited thermal-barrier coats (TBCs) on superalloy substrates has been devised. The novel aspect of the process lies in the use of several relatively inexpensive pack diffusion steps...

An improved method of synthesis of crystalline tin monoxide (SnO) powder for use in anodes of lithium-ion electrochemical power cells has been developed. The carbon used in anodes...

Zn4Sb3 has been identified as a high-performance thermoelectric material. In p-type, Zn4Sb3 samples have exhibited the greatest dimensionless...

Briefs: Materials
Cold Hibernated Elastic Memory (CHEM) Expandable Structures

Experiments have confirmed the feasibility of a new class of lightweight, reliable, simple, and low-cost expandable structures. The concept called "cold hibernated elastic memory" (CHEM) utilizes the shape memory polymers (SMPs) in open cellular structures. Basically, these structures...

Materials based on β-Zn4Sb3have been found to exhibit unusually high values of the dimensionless thermoelectric figure of merit at temperatures between 200...

Briefs: Materials
Nonchromic Acid Brightener for Brass and Copper

A process for precleaning brass and copper parts before processing them further in a clean room includes a brightening chemical treatment in solution of 85 volume percent phosphoric acid, 3 volume percent nitric acid, and 12 volume percent acetic acid. This solution acts rapidly and can be...

A prototype Stirling-engine regenerator containing a matrix made of carbon-fiber-based composite materials has been developed. The concept underlying this development effort is one of...

An alloy of 88Cu/8Cr/4Nb (numbers indicate atomic percentages) has been proposed for use in fabricating rocket-engine combustion chambers by vacuum plasma spraying (VPS). Relative...

Briefs: Materials
Etching Solution for Removal of Silver Plating From Polymers

An etching solution has been developed for use in removal of silver plating from polymer-based (including composite-material) structural components, the surfaces of which are intended to serve as mirrors and waveguide structures. Such structures are often plated with aluminum, copper,...

The anode separators in rechargeable lithium-ion electrochemical cells that contain carbon lithium-intercalating anodes with copper current collectors would be modified, according to...

More accurate analyses of adhesive EA946 can now be accomplished using new mathematical models. Tests involving this adhesive (used in the space shuttle's reusable solid-rocket-motor nozzle and other...

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