Hot corrosion of materials
Abstract
Materials Literature
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Characterisation of cellulose treated by the steam explosion method. Part 2: Effect of treatment conditions on changes in morphology, degree of polymerisation, solubility in aqueous sodium hydroxide and supermolecular structure of soft wood pulp during steam explosion
Abstract An attempt was made to clarify the effect of steam explosion conditions on the changes in morphology, degree of polymerisation P v , solubility towards aqueous alkali solution S a , and supermolecular structure of a soft wood pulp and to elucidate the mechanism by which the steam explosion treatment makes nat…
Hot Corrosion of Preoxidized Ni by a Thin Fused Na2 SO 4 Film at 900°C
The hot corrosion of preoxidized 99% and 99.99% pure Ni covered with a thin Na 2 SO 4 film in a SO 2 ‐ O 2 gas atmosphere was investigated at 900°C by an electrochemical method using a sodium sensor and an oxygen probe. The preoxidation conditions were varied in order to affect the sulfidation of Ni, which resulted in…
The Quantum Mechanics Of Larger Semiconductor Clusters (
Machine learning (ML) is transforming all areas of science. The complex and time-consuming calculations in molecular simulations are particularly suitable for an ML revolution and have already been profoundly affected by the application of existing ML ...Read More
Bronze Disease: A Review of Some Chemical Problems and the Role of Relative Humidity
A general review of some of the theories proposed to account for the process of “bronze disease” is presented from both the historical and chemical points of view. The corrosion product of most serious concern, cuprous chloride, and its inter-relationship with some of the other important corrosion products of copper a…
Synthesis and characterization of trinuclear Schiff-base complexes containing sulphur dioxide or hydrogensulphite ions as bridging groups. Crystal structure of [Zn{(µ-CH 3 CO 2 )(salpd-µ-O,O′)Cu} 2 ][salpd = propane-1,3-diylbis(salicylideneiminate)]
Trinuclear complexes of general formulas [MCu2(CH3CO2)2(salpd)2](M = MgII, MnII, CoII, NiII, CuII, or ZnII) and [MNi2(CH3CO2)2(salpd)2](M = MgII, MnII, CoII, or NiII) were prepared, where H2salpd represents propene-1,3-diylbis(salicylideneimine). Further reactions of the complexes of the former series with sulphur dio…
Relaxation of internal stresses in optical fibers
A method for measuring the relaxation of internal stresses of optical fibers is developed. The authors discuss a few principal previous publications on the subject of annealing and relaxation of glass. The internal stress measurement setup is explained, and useful relations are given. It is pointed out that the relaxa…
Cobalt and Cobalt Alloys
Abstract This article provides a general overview of physical and mechanical properties, alloy compositions, applications, and product forms of cobalt-base alloys as wear-resistant, corrosion-resistant, and/or heat-resistant materials. The discussion is largely focused on cobalt-base alloys for wear resistance, as thi…
The influence of Ga-substitution on the coercivity of Nd-(Fe,Co)-B sintered permanent magnets
In Co-substituted Nd-Fe-B sintered magnets, several additional phases such as Nd(Fe,Co)/sub y/B/sub ?/ with y=2, 3, and 4 have been found besides the hard magnetic phase and the Nd-rich intergranular phase. The low coercivity of the magnet is attributed to the occurrence of these soft ferromagnetic phases. In Ga-doped…
Properties and applications of photoresponsive polymers
Abstract
The β‐crystalline form of wollastonite‐filled polypropylene
Abstract A study has been made of the thermal, X‐ray diffraction, and dynamic mechanical characteristics of polypropylene (PP1330, a copolymer containing 22% ethylene) filled with wollastonite. Various levels of β‐form crystallinity were produced in the PP by mixing in varying amount of wollastonite. It has been found…
Microstructural Basis of Selection of Materials and Mix Proportions for High-Strength Concrete
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Manganese( II ) and iron( III ) complexes of the tridentate ligands bis(benzimidazol-2-ylmethyl)-amine (L 1 ) and -methylamine (L 2 ). Crystal structures of [MnL 1 (CH 3 CO 2 ) 2 ], [FeL 2 Cl 3 ], and [Fe 2 L 1 2 (µ-O){µ-(CH 3 ) 3 CCO 2 } 2 ][ClO 4 ] 2
The preparation and characterisation of [MnL1(CH3CO2)2](1), [Mn6(µ4-O)2(C6H5CO2)10(H2O)4](9), [FeL1Cl3](10), [FeL2Cl3](2), and [Fe2L12(µ-O){µ-(CH3)3CCO2}2][ClO4]2(3) are reported where L1 and L2 are bis(benzimidazol-2-ylmethyl)amine and bis(benzimidazol-2-ylmethyl)methylamine. The molecular structures of (1), (2), and…
Darstellung und Kristallstruktur der Pnictidoxide Na2Ti2As2O und Na2Ti2Sb2O
Abstract Durch Umsetzung von Na 2 O und TiAs bzw. TiSb in verschweißten Tantalampullen unter Argon gelang die Darstellung der metallisch grauen und sehr hydrolyseempfindlichen Verbindungen Na 2 Ti 2 As 2 O bzw. Na 2 Ti 2 Sb 2 O. Sie kristallisieren tetragonal innenzentriert in einem modifizierten anti‐K 2 NiF 4 ‐Typ […
An equivalent circuit approach to analysis of synchronous machines with saliency and saturation
An equivalent circuit approach is presented for synchronous machine analysis. The approach provides a detailed treatment of magnetic nonlinearity without excessive computational complexity. The number of parameters is typically in the range of 30 to 100, in contrast with 13 to 19 in conventional linear models and with…
Halloysite- a critical assessment.
Water enters the interlayer space in halloysite to minimize cation-cation Coulomb repulsion between adjacent layer surfaces and to coordinate exchangeable cations postulated as present to compensate for Al(IV). The layers roll into tubes due to lateral misfit between a larger tetrahedral sheet and a smaller octahedral…
ATLAS : A Suite of Programs for the Analysis of Time-of-flight Neutron Diffraction Data from Liquid and Amorphous Samples
Abstract. A description is given of a suite of computer programs recently developed at ISIS for the analysis of time-of-flight neutron diffraction data from non-crystalline samples. The various stages of the analysis are discussed, giving particular emphasis to those aspects in which the analysis of time-of-flight dif…
Hard magnetic phase in rapidly quenched Zr-Co-B alloys
In order to identify a hard magnetic phase in rapidly quenched Zr-Co-B alloys and clarify its magnetic properties, Zr-Co-B ribbons, Zr-Co ribbons, and Zr-Co ingots were studied. The hard magnetic phase is interpreted as a Zr/sub 2/Co/sub 11/ intermetallic compound. This compound has a Curie temperature of 500 degrees…
Introduction to Aluminum and Aluminum Alloys
Abstract Aluminum, the second most plentiful metallic element, is an economic competitor in various applications owing to its appearance, light weight, fabricability, physical properties, mechanical properties, and corrosion resistance. This article discusses the primary and secondary production of aluminum and classi…
Crystallinity indexes of cellulosic materials.
A simple X-ray diffraction method for the measurement of crystallinity of cellulose was investigated. Principle of the method lies on the analysis of X-ray diffractograms of crystalline cellulose I or II mixed with varying amount of stable amorphous cellulose prepared from anhydro sulfurous acid-diethylamaine-dimethyl…