Materials Literature
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The monoclinic form of LiMgBO 3 has been synthetized and its crystal structure studied by single crystal X-ray diffraction methods. The space group is C 2/ c , Z = 8, with unit cell parameters a = 5.161(1) Å, b = 8.880(2) Å, c = 9.911(2) Å and β = 91.29(2)°. The structure which is isotypic to that of i.a . LiZnBO 3 ,…
Abstract The rheological and thermal properties of poly(vinyl alcohol) (PVA) gels prepared through freezing‐thawing cycles were studied, in order to clarify the relation between structure and functional properties. The breaking strength of PVA gels increases with increasing the degree of saponification (DS), i.e. the…
The chelation of spironaphthoxazine derivatives in the coloured form to divalent metals induced considerable shift of the absorption spectra and significant retardation of the decolouration rate in the dark.
Abstract This article discusses the classifications of high-speed tool steels and describes alloying elements and their effects on the properties of high-speed tool steels. It analyzes the heat treatment of high-speed tool steels, namely, preheating, austenitizing, quenching, and tempering. Surface treatments for the…
Nine structural metals were evaluated for relative nonflammability, in a high pressure oxygen environment. The metals studied were: 316, 321, 440C and 17-4 PH stainless steels (SS), Inconel 600, Inconel 718, Waspaloy, Monel 400, and Aluminum 2219. A comparison is made between four methods which have been used to provi…
This paper examines some of the properties of Alloy 718 required by the oil and gas industry for the completion of corrosive wells. The properties of interest include strength, toughness, pitting and general corrosion resistance, hydrogen embrittlement resistance, and stress corrosion cracking resistance. The effects…
The spark decomposition of mixtures of SF/sub 6/ (partial pressure from 100 to 500 kPa) and water (concentrations between 600 and 2000 VPM) has been studied. The sparks were generated between a point (stainless steel) and a plane (aluminum) either under 50-Hz AC voltage or by discharging a capacitor. Owing to the high…
Abstract Today, material science is directed towards the development of multifunctional and oriented structures. One example of such supramolecular systems are liquid crystalline (LC) elastomers which combine the properties of LC phases (the combination of order and mobility) with rubber elasticity, one of the most ty…
110 to 500 kV mountain power transmission lines in operation in the USSR are discussed. Since 1967 a 100 kV line has been in service at an altitude up to 3.58 km above sea level. A recent 100 kV overhead line is at =4 km, its entire 224 km length running above 1.8 km and at least 65% of its right-of-way lying in mount…
The Pt(5,5′-Me2bpy)(CN)2 complex (5,5′-Me2bpy = 5,5′-dimethyl-2,2′-bipyridine) displays intense photoluminescence in fluid solution (emission maximum, 502 nm; τ0, 6.3 µs) at room temperature; the excited ππ* triplet of Pt(5,5′-Me2bpy)(CN)2 is a powerful one-electron oxidant (E∘, ∼1.0V) and reductant (E∘≤–1.5V vs. AgNO…
Abstract Limited space permits description of only two examples of Kevlar applications research. There are numerous others. In the early product development there were some indications that Kevlar would go mainly into tire reinforcement. This has turned out not to be true. In the mid‐seventies Kevlar was participating…
Grain refinement effect in Ti-doped Cu–Al–Ni shape memory alloys has been studied using microscopic and microanalytical methods. Titanium is found to decrease as-cast grain size and reduce grain coarsening rate during betatization/homogenization heating but does not affect much on large grain refinement during hot wor…
The electrochemical quartz crystal microbalance (EQCM) and ellipsometry have been used to study directly the movement of ions and solvent into/out of electroactive polymer films. The systems studied were polyvinylferrocene (PVF), polybithiophene (PBT) and polythionine (PTh). The overall mass changes accompanying oxida…
The effectiveness of phthalocyanines as acid corrosion inhibitors for steel were studied. Water soluble tetrasulfophthalocyanines are very poor corrosion inhibitors. Water insoluble tetraaminophthalocyanines serve as better corrosion inhibitors than the water soluble ones when the metal surface is coated with an adsor…
The temperature dependence of the thermoelectric power of the semiconducting bismuth-vanadate glasses was presented in a range of compositions. The high-temperature thermoelectric power was satisfactorily explained by Heikes’ relation [R. R. Heikes and R. W. Ure, Eds., Thermoelectricity (Interscience, New York, 1961),…
The Blake threshold is encompassed in most theoretical models of transient acoustic cavitation. Previously, this threshold has been calculated for a bubble having constant surface tension. However, such a bubble is unstable against dissolution and is not a realistic model for a cavitation nucleus. In this article, the…
Abstract Room‐temperature and low‐temperature (10 K) Raman spectra of a single crystal NaH 2 PO 4 were obtained for various polarizations. The polarization characteristics of the Raman spectra remained unchanged throughout the whole temperature range studied. This confirms that there is no phase transition in this cry…
The magnetic properties of Sm/sub 2/(Co,Fe,Cu,Zr)/sub 17/ magnets were improved by increasing the Fe content without raising the Zr content. With increasing Fe content, the remanence rises monotonically while the intrinsic coercive force drops sharply for 0.27>
A theory of electro-optic and elasto-optic effects in the blue phases of cholesteric liquid crystals is developed. The case of small structure deformations and a weak field is considered: |E| ⋛ E c, where E e is the critical field for the cholesteric-nematic transition. The theory explains all of the main experimental…
Abstract Secondary nucleation in industrial crystallizers depends on both supersaturation and mechanical stress by stirring. Most models which consider mechanical stress assume that nucleation is proprotional to the energy transferred to the crystals during collisions. This is not based on any physical relationship an…