matrix modification by graphite powder additives in carbon fiber/carbon composite with thermosetting resin precursor as a matrix

carbon fiber/thermosetting resin matrix precursor modified by graphite powder heat treated at 1000 degrees c and at 3000 degrees c were prepared. the flexural strength and fracture pattern of the composites were observed. small addition (5-10 percent ) of graphite powder to matrix precursor was effective on the strength of both types of c..

rapid thermal/plasma processing for in-situ dielectric engineering

rapid thermal processing of silicon in oxygen and ammonia ambients is an attractive technique for the growth of thin dielectrics such as silicon nitride, silicon dioxide, nitrided oxides, oxidized nitrides, and application-specific (composition-tailored) insulators. multicycle rapid thermal growth processes are suitable for dielectric eng..

kinetic study of aluminization of iron by using the pack cementation technique

the kinetics of the aluminization of pure iron using the pack cementation technique at 900 degrees c under both argon and 5 percent h/sub 2//ar atmosphere have been studied. a low al-activity master alloy with a composition of 60 atom percent (a/o) al-40 a/o fe was used to avoid the formation of intermetallic phases at the substrate surfa..

focused-ion beam milling, scanning-electron microscopy, and focused-droplet deposition in a single microcircuit surgery tool

inspection by microtomography of active devices, tuning and repair of iii-v microstructures and microcircuits have been performed using the capabilities of combined scanning-electron microscope (sem) and low-voltage (0.5-20 kv) focused-ion-beam (fib), or focused-droplet beam (fdb) system. in this instrument, the ion or droplet beams are f..

photoinduced topotaxial exchange reactions in cadmium sulphide thin films

a co/sub 2/ laser, operating at 10.6 mu m, has been used to promote the growth of topotaxial layers of the chalcocite phases of cuprous sulphide in cadmium sulphide thin films immersed in an organic solution of a cuprous salt at ambient temperature. cuprous sulphide growth is initiated by the laser beam which passes through the liquid and..

fabrication and testing of a micromachined shear sensor

a surface micromachine floating-element shear-stress sensor intended for use in turbulence research is described. a package technology has been developed and the sensor has been calibrated in laminar flow. results of the measurements are in good agreement with an electromechanical model of the response

ferroelectric liquid-crystal cells using stable and switchable twisted states

ferroelectric liquid-crystal (flcs) cells with stable and switchable twisted states have been fabricated. examination of various ferroelectric liquid-crystal substances shows that both the cholesteric and smectic-a phases are essential in obtaining good alignment in the chiral smectic-c phase. degrees of alignments with various surface tr..

an application of optical surface assessment to engine preparation techniques

the authors present a study of established two dimensional models which have been applied to the fabrication of engine cylinder liners and bores. these models are extended to three dimensions and quantified using a three dimensional stylus measuring system consisting of a computer controlled talysurf 5 stylus instrument and a precision li..

chemical vapor deposition of a silicon nitride layer with an excellent interface by nh/sub 3/ plasma treatment

a new metal-insulator-semiconductor field-effect transistor (misfet) fabrication technology has been developed by using a silicon nitride insulator. misfets with high field-effect mobility were obtained by exposing a silicon surface to a nh/sub 3/ plasma before silicon nitride (sin/sub x/) deposition as a gate insulator in a rf plasma. an..

nearly ideal electronic surfaces on naked in/sub 0.53/ga/sub 0.47/as quantum wells

the authors have discovered that hydroxide-coated in/sub 0.53/ga/sub 0.47/ag has the lowest known surface recombination velocity of any iii-v semiconductor. to demonstrate the excellent electronic quality of such interfaces, they have measured the quantum shifts in the room-temperature luminescence spectrum of 'naked' in/sub 0.53/ga/sub 0..