improved reaction sintered silicon nitride. / protective coatings to improve oxidation resistance

processing treatments were applied to as-nitrided reaction sintered silicon nitride (rssn) with the purposes of improving strength after processing to above 350 mn/m2 and improving strength after oxidation exposure. the experimental approaches are divided into three broad classifications: sintering of surface-applied powders; impregnation..

source assessment: textile plant wastewater toxics study--phase i

the report gives results of the first phase of a study to provide chemical and toxicological baseline data on wastewater samples collected from textile plants in the u.s. raw waste and secondary effluent wastewater samples were analyzed for 129 consent decree priority pollutants, effluent guidelines criteria pollutants, and nutrients. lev..

charging of flexible solar array substrates in kilovolt electron beams

a series of survey tests were conducted to evaluate samples of flexible solar arrays. the samples used woven carbon fibers and/or coatings to increase the surface conductivity of the kapton substrate and thereby reduce surface charging. four different samples were evaluated by exposing them to monoenergetic electron beams of 2 to 20 kev a..

cartridge for grouting an anchor element in a hole of a support structure

a grouting cartridge is described for placing in a hole of a support structure. the cartridge is capable of rapidly forming a solid grout about an anchor element where the anchor element is thrust into the hole. the cartridge comprises a frangible outer tubular casing fabricated of plastic or the like and containing a uniform mixture of a..

the medical assessment of a new soft body armor

the development of a new lightweight soft body armor appears to lower the morbidity and mortality from certain ballistic threats 'impulse' -type blunt injuries have been produced in laboratory animals. the severity of underlying injury (if any) did not correlate with the seemingly innocent skin lesion seen behind the armor therefore, in t..

plasma etching of platinum film

studies of the relationship between etching rate and gas composition, finishing precision, etching mechanism, and the application of plasma etching to the forming of a ti-pt-au 3-layer electrode for use in high reliability semiconductor devices are reported. (era citation 03:018864)

development of high-mechanical strength electrical insulations for tokamak toroidal field coils

the electrical insulation for the tf (toroidal field) coils is subjected to a high interlaminar shear, tensile and compressive stresses. two candidate epoxy/glass fiber systems using prepreg and vacuum impregnation techniques were evaluated. specimens were prepared and processed under controlled conditions to simulate specification manufa..

industrial ion source technology. / for ion beam etching, surface texturing, and deposition

plasma probe surveys were conducted in a 30-cm source to verify that the uniformity in the ion beam is the result of a corresponding uniformity in the discharge-chamber plasma. a 15 cm permanent magnet multipole ion source was designed, fabricated, and demonstrated procedures were investigated for texturing a variety of seed and surface m..

research on composite materials comprising reaction-injection-molded combinations of carbon fibers and thermosetting resins

the objective of the present feasibility study was to explore whether or not the reinforcement of polyurethane and polyepoxide resins with carbon or polyaramide fibers (kevlar) could be accomplished by means of reaction-injection-molding (rim) technology although the results of the present study were not capable to answer this question un..

polishing and polishing materials

the current approach to optical surface finishing indicates a general dependence on trial and error methods. this paper discusses some of the detailed research that is being done and advances the need for a more scientific approach by the opticians. (era citation 03:015531)