Materials Literature
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The disadvantageous effects of colloidal SiO2 layer and micro-content of metal oxide adsorbed on SiC powder surface on SiC slurry stable dispersion were studied, and the novel method to avoid this disadvantage was proposed. By acidwashing, on the one hand, because the maximum Zeta potential of SiC powder increases to…
(2005). The Refractories Industry - A Review. Materials Technology: Vol. 20, No. 4, pp. 225-232.
The intensity of upconversion emissions of rareearth ions is determined by the maximum phonon energy of glass host. In this paper the intensities of upconversion emissions in Yb3+/Er3+codoped germanatetellurite glas ses upon the excitation of 980nm laser diode were extremely enhanced by replacing PbO wit h Bi2O3 and i…
We show that the expressions for current and heat current calculated via (the non-linearized) ballistic and diffusive transport formalisms reduce to the same form for solid-state devices one electron mean free path in length. The materials parameters for thermionic and thermoelectric devices are also shown to be equal…
In order to understand the effects of hydrogen peroxide on 60Co deposition under water chemistry conditions of boiling water reactors, deposition amounts of 60Co on the stainless steel specimens were measured by changing hydrogen peroxide (H2O2) and oxygen (O2) concentrations in a high temperature water loop, and corr…
The development of advanced solid lubricants is of considerable importance to space tribology. The most common solid lubricant coatings today are based on MoS2, lead or PTFE. However, none of these coatings can simultaneously fulfill all specifications, with regard to friction and wear, under ambient atmosphere and in…
Paraffin wax and other moieties in sulfur vulcanized styrene-butadiene rubber formulations may migrate to the surface, reducing the adhesive strength in joints produced with polyurethane adhesive. In this study, with the aim to remove paraffin wax and other anti-adhesion moieties on the rubber surface to improve adhes…
The effect of Al and Zn contents and annealing conditions on the microstructural evolution and tensile properties were investigated by using Mg-Al-Zn alloys containing 2.0∼4.5 mass% Al and 0.7∼1.5 mass% Zn. The number of shear bands developed during hot rolling increases with increasing Al and Zn contents. As a result…
Waveform of space charge distribution in solid dielectrics measured by the PEA method is severely distorted due to the wave attenuation in material as well as the intrinsic characteristic of measurement system. The waves of interfacial charges before and after attenuation in sample under low electric stresses were sim…
N-type Bi1.9Sb0.1Te2.6Se0.4 alloys were prepared by a rapid solidification technique and subsequent hot-pressing method. The microstructure and thermoelectric properties of the alloys were investigated as a function of the hot-pressing temperature and pressure. The X-ray diffraction measurements indicate that the grai…
The superplastic properties of different semi-products out of Alloy 718 with microcrystalline (MC), submicrocrystalline (SMC) and nanocrystalline (NC) structures processed by severe plastic deformation and rolling have been studied. The alloy with SMC and NC structures can exhibit features of low temperature superplas…
Two self-complexing compounds based on donor-acceptor interactions, one comprised of a p-electron-deficient cyclobis(paraquat-p-phenylene) (CBPQT 4+ ) ring attached to a side-arm component containing p-electron-rich tetrathiafulvalene (TTF) and 1,5-dioxynaphthalene (DNP) units, and the other comprised of a CBPQT 4+ ri…
Carbon nanotubes are graphene cylinders of nanometric diameter which can be either semiconducting or metallic depending on their geometry. Joining different kinds of nanotubes by means of topological defects, one can design all-carbon quantum dots and, in principle, achieve electronic confinement in quasi-zero dimensi…
Nanorods of a compound semiconductor, BiOCl, have been prepared from BiCl3 solutions containing a nonionic surfactant, t-octyl-(OCH2CH2)xOH, x=9, 10 (Triton X-100). Powder X-ray diffraction (XRD) pattern indicated that the product was pure tetragonal phase bismoclite (BiOCl). The product was also characterized by the…
Hydrogenated amorphous carbon (a-C:H) nanotips have been successfully grown on Cu ∕ Ti ∕ Si ( 100 ) by microwave plasma-enhanced chemical vapor deposition. A Cu etching process occurs simultaneously during the growth of the a-C:H nanotips. Both the Cu etching and a-C:H nanotips growth rates continuously increase with…
Direct observation of the defect formation in carbon nanostructures during electron irradiation is carried out by high‐resolution transmission electron microscopy (HR‐TEM) on the double‐wall carbon nanotubes (DWNT) and carbon nanopeapods. The irradiation damage due to the knock‐on collision with high energy electron b…
At the composition of Ti4040Zr4040Ni2020 , a single_phase cylindr ical quasicrystalline alloy, 3mm in diameter and 15mm in length, can be fabr icated by a copper-mold casting method. Its quasicrystalline nature and structu ral homogeneity were confirmed by x_ray diffraction and transmission electron mi croscopy. Accor…
The structure of high-silica porous glasses and quartz-like (Vycor type) glasses has been investigated by transmission and scanning electron microscopy and by electron micro-probe analysis. Porous glasses (PGs) have been manufactured by acid leaching of phase-separated alkali borosilicate glass plates. To obtain the q…
(ARTYKUŁ ZAMAWIANY) Ceramic matrix composites (CMCs) are non-brittle structural ceramics for application at high temperatures. They consist of ceramic fibers embedded in a ceramic matrix, the fiber/matrix bonding being controlled through weak enough interphase. CMCs are processed following gas, liquid or powder routes…
The connection between the external and internal direct magnetic field intensities in an ellipsoidal magnetic insulator in a uniform field is a classic result in the literature. It is usually stated in terms of shape demagnetising factors. The case of the non-ellipsoidal geometry in a uniform field has been dealt with…