l'usinage electrochimique d'alliages base nickel (electrochemical machining of nickel based alloys)

the principles of electro chemical machining (ecm), which is based on the anodic dissolution of the material to be machined, are recalled. the procedure is similar to electropolishing and electrofettling. the piece to be machined forms the anode whilst the cathode is the tool which defines the geometry of the shape to be produced. the fun..

experimental shipboard coveralls for engineering personnel. final rept

the navy clothing and textile research facility (nctrf) conducted a 6-month evaluation of a new wash-and-wear coverall aboard 18 surface ships (operation alpha) and 5 submarines (operation bravo). each evaluation consisted of three phases. the first phase covered 3 months of normal use, after which the coveralls were returned to nctrf wit..

coatings on composites - new developments and applications in the aerospace industry

the reported paper describes methods of coating composite structures (glass, carbon, aramid fibres in epoxy-, peek- and/or carbon matrix) with layers for different applications. composites such as carbon fibre-reinforced plastic composites (cfrp) are extremely useful polymer materials for lightweight construction. some coating methods hav..

mach 5 electroformed nickel nozzle refurbishment fnas investigation of ultra-smooth surfaces

this task is in support of the quiet hypersonic wind tunnel effort currently in effect at nasa langley research center, va. a laminar flow wind tunnel nozzle has been previously fabricated by electroforming pure nickel over a machined and polished two piece stainless steel mandrel. the mandrel was removed leaving the replicate nozzle surf..

chemical processing department monthly report, april 1961. progress rept

pu nitrate production was above revised forecast. 141 kci sr-90 was isolated in purex and stored for decay; to date, 1190 kci has been recovered from purex wastes. casks of cs-137 and sr-90 were turned over to aec for ornl. production of uo(sub 3), pu metal buttons, and weapon component fabrication exceeded forecasts. purex processing con..

transverse flexural tests as a tool for assessing damage to pmr-15 composites from isothermal aging in air at elevated temperatures

to date, the effect of thermo-oxidative aging on unidirectional composite mechanical properties has been monitored by the measurement of interlaminar shear strength (ilss) and either three or four point longitudinal flexural strength (lfs) of the composites being tested both results are affected by the fiber-to-matrix bonding, the former ..

solid polymer electrolytes for rechargeable batteries. final report progress rept

sri international has synthesized and tested new, dimensionally stable polymer electrolytes for high energy density rechargeable lithium batteries. we have prepared semi-interpenetrating networks of sulfur-substituted polyethyleneoxide with tetmethylorthosilicate (teos). the in situ hydrolysis of teos produces a mechanically stable three-..

cutting tool study: 21-6-9 stainless steel

the rocky flats plant conducted a study to test cermet cutting tools by performing machinability studies on war reserve product under controlled conditions. the purpose of these studies was to determine the most satisfactory tools that optimize tool life, minimize costs, improve reliability and chip control, and increase productivity by p..

herstellung von gipsfaserplatten auf altpapierbasis mit hohen festigkeiten. abschlussbericht. (production of high-strength staff plates based on waste paper. final report)

waste paper is dry-ground in the refiner and wetted with water in a mixer. the quantity of water suffices to bind the gypsum which is added later, yet is small enough to avoid that excess water escapes the plate as it is pressed. the addition of starch dissolved in the mixing water improves the homogeneity and the mechanical properties of..

waste reduction activities and options for a fabricator and finisher of steel computer cabinets. environmental research brief

the u.s. environmental protection agency (epa) funded a project with the new jersey department of environmental protection and energy (njdepe) to assist in conducting waste minimization assessments at thirty small- to medium-sized businesses in the state of new jersey one of the sites selected was a fabricator and finisher of steel comput..