Keyword: Coatings, colorants, and finishes

Briefs: Materials
Tailoring Fiber/Matrix Interfaces Through Kirkendall Defects

In a proposed method of tailoring some of the mechanical properties of metal-matrix, oxide-matrix, and ceramic-matrix composite materials, Kirkendall defects (microscopic pores as described below) would be introduced into thin interfacial layers between the fibers and the matrices....

Briefs: Materials
Reducing Damage to Alumina Fibers in Metal-Matrix Composites

Coating alumina fibers with sputtered metal has been proposed as a means to enable the fibers to retain more strength when the fibers are incorporated into metal-matrix composites. If the alumina fibers could be made to retain more strength, then it would be possible to manufacture...

Briefs: Electronics & Computers
Microplasmic Coating Shows High Resistance to Wear, Heat and Corrosion

The process of anodizing, or controlled oxidation, of aluminum and aluminum alloys is more than seven decades old. The primary intent of anodizing aluminum and aluminum-alloy parts is to protect the highly reactive surface against corrosion in aqueous environments, such as...

Briefs: Electronics & Computers

A microwave-cavity applicator has been developed for coating multiple fibers by chemical vapor deposition (CVD). A prototype of the applicator was used to deposit silicon carbide...

Briefs: Physical Sciences

A proposed extension of the impressed-current method of cathodic protection of metal against corrosion in wet environments would reduce the current and power needed. The proposal involves (1) the...

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: Photonics/Optics

Small ball (full sphere) lenses in the 0.5-mm to 3.0-mm diameter range offer a number of practical advantages for fiber-to-fiber coupling and fiber collimation. Ball lenses are...

Briefs: Materials

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...

Briefs: Electronics & Computers

Monolithic, tandem two-junction InxGa1-xP/InxGa1-x As-on-Ge Solar Photovoltaic Cells are being developed. The cells are designed...

Briefs: Manufacturing & Prototyping

An integrated suite of computer programs is undergoing development to address issues pertaining to the formation of burrs — undesired projections of metal that are generated on...

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...

Briefs: Electronics & Computers
Prolonging the Lives of Rechargeable Lithium-Ion Cells

Several modifications of the design and operation of lithium-ion rechargeable electrochemical cells have been proposed to prolong the cycle lives of the cells. As explained below, overdischarge can result in dissolution of a metal current collector in the anode of a cell, with consequent...

Briefs: Photonics/Optics

In a filing before the U.S. Patent and Trademark Office, the Boeing Company has disclosed a post-processing method for dielectric combiner elements that may reduce the cost of grading dual combiner sets by...

Briefs: Photonics/Optics

A proposed miniature, electrically tunable, band-pass optical filter would have a Fabry-Perot configuration, but would be designed to trade the high spectral resolution (narrow-band pass)...

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...

Briefs: Manufacturing & Prototyping

A process for the fabrication of improved high-temperature fiber-optic sensor heads has been proposed. Fiber-optic sensor heads that can withstand hot, dirty, noisy environments are...

Briefs: Photonics/Optics
Fabrication of Diffractive GaAs Microlenses

A planar array of microscopic diffractive optical elements that resemble macroscopic Fresnel lenses can be fabricated as an array of continuous relief patterns on a GaAs substrate by a procedure that includes the transfer of a corresponding array of patterns formed on a surface layer of poly(methyl...

Briefs: Physical Sciences
Transparent Furnaces for High-Temperature Research

Transparent furnaces are being developed for use in research on properties and processing of materials at high temperatures. Full optical access to the interiors of furnaces is intended to provide the capability for nonintrusive diagnosis and feedback control of the subtleties of...

Briefs: Photonics/Optics

Voltage-tunable optical band-pass filters based on surface plasmon waves have been proposed. These filters would function at both visible and infrared wavelengths. Whereas...

Briefs: Materials

Current production thermal-barrier coatings (TBCs) have been shown to be capable of reducing the average temperatures of metallic components by 50 to 80 °C and hot-spot temperature by...

Briefs: Mechanical & Fluid Systems

Automatic valves have been proposed for shutting off flows of liquids when abnormally large accelerations occur. These valves could be used, for example, to prevent outflows of...

Briefs: Materials

Ion-beam-deposited surface layers of diamond-like carbon (DLC) on fine-grain chemical-vapor-deposited (CVD) diamond have been found to be effective in reducing friction and wear in a...

Briefs: Materials

Two poly(arylene ether phosphine oxide)s (PAEPOs) have been found to be suitable as matrix and coating materials for composite-material (matrix/fiber) tanks and pipes that contain...

Briefs: Materials

Two techniques have been proposed to reduce thermal-expansion mismatches between (a) substrates made of silicon, silicon-based ceramics, and silicon-based-ceramic composite...

Briefs: Manufacturing & Prototyping

The figure illustrates selected aspects of a manually actuated apparatus for use in coating two small objects with suitable metals, then forcing the two objects together at the coated flat...

Briefs: Electronics & Computers

A substrate of nickel coated with a thin layer of silver and further coated with a thin protective layer of silicon dioxide has been found to constitute an optically reflective...

Briefs: Physical Sciences
Combination of Cryotrapping and SPME for GC/MS Analysis

An improved process has been devised for acquiring and preparing trace amounts of airborne organic compounds for analysis by a gas chromatograph and mass spectrometer (GC/MS). A sample of air is passed through a cryotrap, where organic compounds and water vapor condense on the wall of a...

Briefs: Electronics & Computers

The figure illustrates a lightweight composite-material dual-beam reflector antenna for the SeaWinds spaceborne scatterometer instrument, which operates in the Ku band and is designed to...

Briefs: Materials

The figure schematically illustrates an apparatus and process in which a continuous tow of silicon carbide fibers is coated and infiltrated with a polymer/silicon slurry. A compact of such...