refractory metals fabrication technology as applied to fusion reactors

activities are reported in research programs on inspection and fabrication of refractory metals and alloys including those of mo, nb, ta, and v. progress is summarized in sections on blanking, edge preparation, machining, forming, joining, cleaning, thermal processing, and coating. (era citation 02:010430)

dielectric coatings on metal substrates

large aperture, beryllium substrate-based mirrors have been used to focus high intensity pulsed laser beams. finished surfaces have high reflectivity, low wavefront distortion, and high laser damage thresholds. this paper describes the development of a series of metallic coatings, surface finishing techniques, and dielectric overcoatings ..

economic tradeoffs in deburring

the reliability of small precision mechanisms depends on the production of burr-free, sharp-edged parts. an investigation was conducted to determine how these requirements could best be maintained. the study included investigating the capabilities of the 24 major deburring processes and finding other techniques for minimizing burr-related..

deburring by centrifugal barrel tumbling

the reliability of small precision mechanisms greatly depends upon the production of burr-free, sharp-edged parts. centrifugal barrel finishing (harperizing) is one of the few processes capable of producing these conditions. burrs less than 0.001-in. thick by 0.001-in. high (25.4 x 25.4 mu m) can be removed from 303 se stainless steel, 10..

corrosion behaviour of mixed laminates (cfrp core with both 7075-t6 clad and 5052-h38 faces)

salt spray tests were carried out on mixed laminate panels with both 0.1 mm thick 5052-h38 faces and 0.3 mm thick 7075-t6 clad faces, with carbon fiber reinforced plastic core, to determine the degree of attack by corrosion. it was found that mixed laminates made up with 7075-t6 clad aluminum alloys faces can be deteriorated rapidly by bo..

hand punching holes in unfired 99.5 percent alumina substrates

the tooling and process techniques for hand-punching holes in green (unfired) 99.5 percent alumina ceramic substrates were investigated to determine the requirements for obtaining holes with good surface finish and a minimum number of defects. such holes are needed to provide low electrical resistance ground paths from frontside to backsi..

memory assembly to hybrid microcircuits

a memory module consists of a wired array of ferrite cores bonded and soldered to a hybrid microcircuit (hmc). the hmc is shipped to the memory plane supplier, where it is attached to the memory plane and returned. by developing suitable manufacturing processes, the need to ship the hmc to the memory supplier can be eliminated and materia..

the surface composition and energetics of type a graphite fibers

this report documents the results of an in-house program to determine what type of interactions occur between graphite reinforcing fiber and the polymeric matrix in advanced composites and how these interactions effect interfacial mechanical properties and durability. surface treatments applied to type a fiber of pan-based material increa..

formation and evaluation of convex-curved crystals of lithium fluoride for use in analyzing x-ray spectra

lithium fluoride as received from the vendor in boule form is 38 x 38 x 13 mm thick. this block is cleaved to wafers of the desired thickness, x-ray-evaluated for ''d'' spacing and greatest intensity, bent to the required radius, and then acid-etched to remove foreign material. the diffraction and dispersion characteristics of a wafer are..

effect of quartz surface treatment on the blow-up of xenon flashtubes. technical report number b-4435

the effects of selected quartz surface treatments, such as etching and fire polishing, on the explosion energy of flashtubes were determined. in addition, selected flashtubes were life tested and then exploded to determine the longevity of any beneficial treatments found. the test results showed that no improvement in explosion energy can..