Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Factors that influence alloying zirconium to magnesium with a Mg-33.3Zr master alloy and the subsequent grain refinement are discussed based on a large number of experiments conducted at the laboratory scale (up to 30 kg of melt). It is shown that the zirconium particles released from the Zirmax(R) master alloy must b…
The oxidation behavior of B4C–(25–60 mol%)SiC composites prepared by arc-melting was investigated in the temperature range of 1073 to 1773 K using a thermogravimetric technique. Liquid borosilicate, solid SiO2 and carbon were identified as oxidation products by X-ray diffraction and Raman spectroscopy. Mass gain was o…
This paper reviews recent developments in complete oxidation of methane at low temperatures over noble metal catalysts in the past 20 years. The Pd/Al2O3 catalyst system is fully discussed. The review mainly focuses on the kinetic aspects of methane oxidation over this catalyst, and methane activation behavior over Pd…
Abstract New decaborane-based, single-source molecular and polymeric precursors to boron carbide have been developed that enable the formation of boron carbide in processed forms, including nanofibers, nanocylinders, and nanoporous materials.
We report the synthesis of a class of lithium salts in which the two strongly Lewis basic sites of lithium imidazolide are each complexed by the Lewis acid to yield lithium bis(trifluoroborane)imidazolide The anion has a high degree of charge delocalization over the aromatic ring and two four-coordinate boron centers…
Significant grain refinement has been achieved in a cast Mg-based AZ91 alloy via large strain hot rolling. This is a simple processing method consisting of one rolling pass at intermediate temperatures with a large thickness reduction. The as-cast material was first homogeneized in order to obtain a homogeneous and eq…
Activated carbons were produced from compressed South African sugarcane bagasse in a pyrolysis furnace by adopting the physical method of processing viz. carbonization followed by partial gasification with steam. Feasible processing conditions were determined by varying the temperature, hold times and partial pressure…
The effect of water vapour on the oxygen isotope exchange reaction was investigated for gadolinium doped ceria (GDC), scandium stabilized zirconia (ScSZ), and iron doped ScSZ (Fe-ScSZ). A slight amount of water vapour addition made a great enhancement of surface exchange rate of oxygen isotope (18O) on the surface. Th…
The paper describes several innovative designs for a bird strike resistant composite leading edge for a Horizontal Tail Plane of an aircraft. These designs were based on a novel application of composites with high energy-absorbing characteristics: the tensor-skin concept. This paper describes the development of this e…
The radioactivity in the primary circuit of pressurized water reactors (PWR) mainly comes from the activation of corrosion products in the core of PWR; corrosion products dissolve from the oxide scales developed on steam generator tubes of alloy 690. The controlling of this process, oxidation and dissolution, requires…
Gyroelectric and gyromagnetic media have tensorial gyrotropic dielectric permittivity ε and magnetic permeability μ and thus are generally treated separately. In order to unify their descriptions and to determine the mode propagation in a generalized medium, the solution of the equations of the electromagnetic field i…
Novel supramolecular, reversibly formed polymers featuring self-assembling capsules have been constructed through chemical fixation of CO2 and hydrogen bonding.
Vacuum diffusion bonding of SiC ceramic to Ni–25 at.-%Cr alloy was carried out at 1223–1323 K for 0.9–3.6 ks under a pressure of 7.2 MPa. The kinds of the reaction products and the interface structures of the joints were investigated by scanning electron microscopy (SEM), electron probe microanalysis (EPMA), and X-ray…
The first demonstration of photo-reversible Pb2+-complexation of an insoluble spiropyran-carrying copolymer in aqueous solutions is presented.
A new series of polyamides (ph-azo-PAMs) was synthesized by the polycondensation of isophthalic acids having a photoisomerizable phenyl azo unit with 4,4′-diamino-3,5,3′,5′-tetraethyldiphenylmethane or by the esterification of poly(imino-5-oxyisophthaloylimino-1,4-(3,5-diethyl)phenylenemethylene-1,4-(3,5-diethyl)pheny…
Temperature dependence of photoconductivity has been investigated for single-wall carbon nanotube films at 0.7 eV. In order to clarify the effect of atmosphere on photoconductivity, measurements have been performed under helium and nitrogen gas flow in the temperature range from 10 K to room temperature (RT) and from…
A new material recycling technology for crosslinked rubber was developed using the continuous reactive processing method. In this process of producing reclaimed rubber, breakage of crosslinking points in the crosslinked rubber occurs selectively under the controls of shear stress, reaction temperature, and internal pr…
This paper describes the low temperature hydrothermal synthesis of y-Y2Si2O7 from a layered silicate (2 ∶ 1 clay), a precursor which acts as a structure-templating agent. Both the transformations undergone by the clay during the hydrothermal process and the new products formed at different reaction stages have been ch…
The synthesis and spectroscopic properties of some novel photochromic 3H-naphtho[2,1-b]pyrans are reported. Varying the size of an ortho-substituent on one of the geminal aryl rings allows the rate of fade of the photogenerated color to be controlled.
For the first time, in situ Raman and FTIR measurements have been carried out on a single bench-top instrument to characterize an alumina-supported palladium during the catalytic DeNOx reaction. While IR spectroscopy gives access to dedicated information on the NOx adsorbed species, Raman spectroscopy is highly sensit…