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。
Nanocrystalline lead zirconate titanate (PZT) powders, with a Zr:Ti ratio of 60:40, have been prepared from a solution of triethanolamine (TEA) and Ti 4+ , Zr 4+ , and Pb 2+ ions. The metal ions were in solution through complex formation with TEA. The soluble metal‐ion–TEA complex formed the precursor material when it…
Abstract All tool steels are heat treated to develop specific combinations of wear resistance, resistance to deformation or breaking under loads, and resistance to softening at elevated temperature. This article describes recommended heat treating practices, such as normalizing, annealing, austenitizing, quenching, pr…
A simple model for the design of selective catalytic reduction (SCR) process is presented. The two-dimensional mass transfer equation shown in Bai and Chwu (1997) is simplified and the analytic solution is obtained. The analytic solution is verified by the solution of the numerical two-dimensional model as well as pub…
Article Mikrostruktur und Wechselverfomnmgs- verhalten des mechanisch randschichtverfestigten Stahls Ck 45 was published on December 1, 1998 in the journal HTM Journal of Heat Treatment and Materials (volume 53, issue 6).
Abstract This article describes the methods and equipments involved in the preparation of specimens for examination by light optical microscopy, scanning electron microscopy, electron microprobe analysis for microindentation hardness testing, and for quantification of microstructural parameters, either manually or by…
The formation of scale under sulphuric acid pressure leaching conditions of a limonitic laterite ore was investigated. Experiments were conducted using a batch titanium autoclave in order to study the effects of acidity (0.15–0.40 M), and temperature (250–270°C) on scale formation. It was found that scale increases wi…
The synthesis of poly(thio- 1,4-phenylene) (PPS) at room temperature by the reaction of diphenyl disulfide with potassium persulfate (K2S2O8) in non-basic solvents, in the presence of trifluoromethanesulfonic acid, is reported. The reaction in chlorinated solvents, such as dichloromethane and tetrachloroethane, result…
Abstract Titanium metal passes through three major steps during processing from ore to finished product: reduction of titanium ore to sponge (porous form), melting of sponge and scrap to form ingot, and remelting and casting into finished shape. This article describes primary fabrication, including all operations that…
The unsolved problem of plastic waste utilization has led to a great interest in the development of studies of accelerated degradation of polymers. In this work the course of photo-oxidative degradation of some water soluble polymers such as poly(acrylic acid) (PAA), poly(methacrylic acid) (PMA) and poly(vinylpyrrolid…
The electrolytic manufacture of sodium hydrosulfite is affected by feedstock composition, electrode morphology, and electrode material. Here we show that porous graphite cathodes can provide the highest one‐pass conversion of sodium bisulfite to hydrosulfite, without contamination by sodium thiosulfate. For example, a…
By Mg doping of ZnS, the lattice constants and the band gap of Zn1−XMgXS host material were increased. The emission spectrum of Mn in Zn1−XMgXS shifted to shorter wavelengths than that of ZnS:Mn. The electroluminescent (EL) devices fabricated with the source of X=0.32 show 552 nm peak yellowish–green emission. Deposit…
Thin films of VO 2 single-crystalline on (0001) sapphire substrates have been prepared by visible pulsed laser ablation technique. The crystal quality and properties of the films are evaluated through electrical resistance measurement, x-ray diffraction (XRD), and Rutherford-backscattering spectroscopy/channeling (RBS…
Abstract Titanium and its alloys are used in various applications owing to its high strength, stiffness, good toughness, low density, and good corrosion resistance. This article discusses the applications of titanium and titanium alloys in gas turbine engine components, aerospace pressure vessels, optic-system support…
Electromigration reliability is a key concern for implementation of low dielectric constant (low κ) materials for on-chip interconnects. To address this problem, we have carried out a comparative study of electromigration performance for Al(0.5 wt% Cu) line structures formed with tetraethylorthosilicate (TEOS)-based S…
In the modeling of transducers, especially magnetic transducers, hysteresis may affect performance. Hysteresis models have been improved greatly and are capable of modeling a large variety of rate‐independent phenomena, and are capable of describing minor loops. Of these, the most useful are: the Preisach model, the p…
In considering crystal symmetries, crystallographers tend to think in terms of particular configurations. In using nonlinear continuum theory to analyze such things as phase transitions and twinning, one needs to consider a variety of configurations having different symmetries. Correlating these leads to some unanswer…
Abstract New spin-crossover iron(III) complexes [FeM(salten)L]X with an alkali ion in a macrocycle have been prepared, and the magnetic properties of the complexes in the solid and in acetonitrile solution have been examined, where M is Li+, Na+, K+, or Rb+, H2salten is 4-aza-heptamethylene-1,7-bis(salicylideneiminate…
Chiral dopants are optically active substances used in liquid crystal systems. We have investigated the helical twisting power and its temperature dependences for the systematic rows of optically active organic compounds synthesized on the base of 2-methylbutanol and e-menthol. The compounds differ by molecular, chemi…
Single crystals of the sapphirine and surinamite analogues in the MgO - Ga2O 3 - GeO 2 system have been grown from potassium molybdate fluxes. Their crystal structures and cation distributions have been determined by X-ray diffraction. Sapphirine, Mg (sub 8.9) Ga (sub 14.2) Ge (sub 4.9) O 40 , crystallizes in the P1 s…
The low energy electron diffraction technique was used to study the hydrogen chemisorption induced structural instability on the diamond C(111) surface. From the quantitative analysis of diffraction spots intensity on the as-dosed, partially desorbed, and annealed hydrogenated C(111) surfaces, the correlation between…