melting of iron-aluminide alloys

the melting of fe(sub 3)al-based alloys at the oak ridge national laboratory (ornl) and commercial vendors is described. the melting processes evaluated includes are melting, air-induction melting (aim) , vacuum-induction melting (vim), and electroslag remelting (esr) the quality of the ingots studied are base on internal soundness and th..

electron microscopy of interfaces in silicon carbide whisker-reinforced alumina composites

knowledge about the nature of interfaces between sic whiskers and alumina matrices is critical to understanding the mechanical behavior of these types of composites. the fracture toughness, in particular, is strongly influenced by the bond characteristics of this interface previous results have shown that oxidizing the whiskers in air pri..

precision laser cutting

many materials that are otherwise difficult to fabricate can be cut precisely with lasers. this presentation discusses the advantages and limitations of laser cutting for refractory metals, ceramics, and composites. cutting in these materials was performed with a 400-w, pulsed nd:yag laser. important cutting parameters such as beam power,..

ultra precision machining. final rept

there are a number of fields that require or can use to advantage very high precision in machining. for example, further development of high energy lasers and x-ray astronomy depend critically on the manufacture of light weight reflecting metal optical components. to fabricate these optical components with machine tools they will be made ..

ultraviolet curing of polymer coatings. april 1980-april 1990 (a bibliography from world surface coatings abstracts). rept. for apr 80-apr 90

this bibliography contains citations concerning methods, evaluations, and equipment for the ultraviolet curing of polymer coatings. topics include curable coating compositions, protective and decorative coatings, optical fiber coatings, curing photoinitiators, properties and stabilization of cured coatings, and coating binders ultraviolet..

willingness to pay for water in newala district, tanzania: strategies for cost recovery. field rept

with a small internal market and few prospects to expand traditional economic activities, swaziland must look to new industries to create the jobs needed to keep real income growing. the paper analyzes swaziland's potential for industrialization by comparing its situation to those of four newly industrialized countries - mauritius, south ..

united states air force graduate student research program. 1989 program technical report. volume 1. annual rept

bartial contents: laser polarimeter development; euler solutions to transonic flow past an with wraparound fins; observations and improvements of ballistic stress analysis techniques; latin hyper-cube sampling with regression analysis for prediction of engine infrared observables; a general purpose two dimensional plotting program; matrix..

effect of surface oxygen on adhesion of carbon fiber-reinforced composites. final rept

five carbon fibers from different precursors were surface treated by various chemical reagents for the elucidation of the mechanism involved in the interfacial adhesion. sem, esca, and sam techniques were used to characterize morphology, as well as surface constituents of the treated fibers. the transverse tensile strengths of the composi..

biocompatibility assays. december 1985-march 1990 (a bibliography from the biobusiness database). rept. for dec 85-mar 90

this bibliography contains citations concerning methods for evaluating the biocompatibility of drug delivery systems, implant devices, dental alloys, intraocular lenses, collagen fibers, polymeric prosthetics, surgical sutures, and biosensor electrodes. in vitro and in vivo technologies, which include cell culture, whole blood perfusion, ..

adhesion improvement with silicon based coupling agents. january 1975-february 1990 (a bibliography from the rubber and plastics research association database). rept. for jan 75-feb 90

this bibliography contains citations concerning the effect of silanes on promoting the adhesion of polymers to a variety of surfaces. silanes added to pigments, fillers, extenders, and composites are discussed. adhesion between polymers and glass, fibers, metals, and rubbers are examined. chemical bonding and the mechanism of adhesion tha..