Materials Literature
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Radiation-cooled rockets are used for a range of low-thrust propulsion functions, including apogee insertion, attitude control, and repositioning of satellites, reaction control of launch vehicles, and primary propulsion for planetary space- craft. The key to high performance and long lifetimes for radiation-cooled ro…
Electronic properties of passive layers grown anodically on Al 7075 (UNS A97075) in chromate and oxalate solutions during polarization at 500 mVSCE were investigated using electrochemical impedance spectroscopy (EIS). Impedance results were analyzed in terms of capacitance-vs-frequency plots during reverse polarizatio…
In the present work the effect of incident laser power on the Raman spectra of diamond isolated particles and continuous films deposited on silicon and glassy carbon (GC) substrates by the chemical vapor deposition method is investigated. It is shown that the Raman line position measured for diamond particles shifts t…
Abstract This paper analyses the causes of the premature failure call welded AISI 316L stainless steel (ss) pipes which formed part of a sea water cooling circuit. The service time of the pipes was 8 months. The laboratory tests carried out consisted of metallography tests, δ‐ferrite determination, intergranular corro…
A pressure-induced phase change in the title compound involving a Jahn−Teller switch is observed at an applied pressure of ∼200−250 bar at room temperature by both neutron diffraction and EPR spectroscopy. The transition reverses upon lowering the pressure with a hysteresis of about 100 bar. The single-crystal EPR spe…
This paper describes numerical analysis of the PHEBUS FP containment thermal-hydraulics. PHEBUS FP is an international project undertaken with the aim of evaluating the behavior of radioactive fission products released from a LWR pressure vessel into the containment vessel during a hypothetical severe accident. Six in…
The ferroelastic deformation of t ‐ZrO 2 , the microstructure of which was described in detail in Part I, was investigated by in situ deformation experiments in the high‐voltage electron microscope at 1150°3C. During the experiments those two domain variants with their c‐axes perpendicular to the [010] tensile directi…
Attempts were made to improve the adhesion and strength properties of a copper clad thermotropic liquid crystalline polymer (LCP) for use in advanced printed circuit board (PCB) applications, through manipulation of processing/laminating conditions. Two types of copper foil were investigated. Most significantly, it wa…
The crystal structure of form II of syndiotactic poly(1-butene) is presented. According to the present analysis, chains having a s (5/3)2 helical conformation are packed in a monoclinic unit cell with axes a = 15.45 Å, b = 14.36 Å, and c = 20 Å and with γ = 116° The crystalline density is 0.933 g/cm 3 with four chains…
Photoluminescence spectra of thin-film aluminium oxide samples on aluminium show spectral lines at ca. 330 and 420 nm that are attributed to the F + and F centers of aluminium oxide, respectively. Experimental results reveal that the F centers are responsible for the intrinsic cathodic luminescence of an oxide-covered…
The phase diagram of a multiblock copolymer containing domains of coexistence of phases having different superlattice symmetries with a density of monomers of a given type that varies periodically in space. The parameters of such superlattices are calculated in the mean-field approximation, and it is shown that their…
The magnetic nature of a NiO shell and a Ni core were separately investigated in the temperature dependence of the magnetization curve of the samples with the average sizes of 1.6, 2.0, 2.2, 2.5, 2.8, 3.0 and 3.2 nm. The superparamagnetism of the NiO shell and Ni core were observed in specific temperature ranges. The…
Magnesium AZ91 alloy powder was produced by centrifugal atomization under various conditions using an inverted disk atomizer. The particle size distribution was obtained as a function of the disk shape and rotation speed. The microstructure of particles and their shape were examined and characterized. Their cooling ra…
Results of study of the neutron irradiation effect on pure copper at 340°C are presented. Neutron irradiation, resulting in accumulation of 2 appm of helium (experimentally measured) is shown to cause an appreciable reduction of high-temperature ductility of pure copper at testing temperatures up to 300°C. The SEM and…
Heavy metal fluoride glass ZBLAN, with molar composition ZrF4(53)–BaF2(20)–LaF3(4)–AlF3(3)–NaF(20), was studied in vacuum at high temperatures up to 480°C by Raman spectroscopy. The vitreous glass was found to crystallize at 330°C, most probably to β-BaZrF6 crystallites. High-temperature experiments in air were also c…
Dense mullite coatings have been deposited on SiC and Si3N4 substrates by chemical vapor deposition (CVD). The coatings were compositionally graded with the Al/Si ratio increasing from 1.5 at the substrate/coating interface, to a value of 8 at the coating surface. This gradation of composition is discussed in light of…
Abstract Volatile species are removed from polymers by devolatilization. Foaming experiments using corn syrup and low‐density polyethylene were carried out to investigate effects of volatile content, operating vacuum level and stripping agent in devolatilization. When foaming and rupture occur, a limiting foam volume…
A new fabrication technology for producing hypertextured aluminum-copper (Al–Cu) films has been developed. The key feature of this technology is the argon (Ar) plasma treatment of the titanium (Ti) underlayer. The full width at half-maximum values of the Al (111) rocking curve decrease with increasing Ti etched thickn…
The effects of adding different amounts of vanadium (0.02–0.54%) to ductile irons have been investigated. Optical microscopy revealed that that the addition of vanadium led to the formation of a phase with a particle size of up to 6 μm in the as-cast microstructure and SEM—EDX microanalysis showed that this phase is v…
The C 1s, F 1s, and O 1s components of the x-ray photoelectron spectroscopy spectrum of Teflon AF 1600 have been obtained, and their constituent peaks were separated and attributed. The effect of an intervening carbon atom on the F 1s spectrum has been shown to decrease the inductive effect of a next-nearest neighbor…