Selection and Use of Wear Tests for Metals
Description An excellent state-of-the-art book containing seven papers that treat a variety of wear test problems and techniques.
Materials Literature
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The first peroxometalloporphyrin with dioxygen symmetrically bonded by both atoms; synthesis and X-ray crystal structure of peroxotitaniumoctaethylporphyrin
Treatment of oxotitaniumocthylporphyrin with benzoyl peroxide leads to a complex which is shown to have a peroxo-bonding structure by X-ray diffraction; the oxygen atoms of the dioxygen are both bonded to the metal.
Mechanism of oxidation at a copper–polyethylene interface. II. Penetration of copper ions in the polyethylene matrix
Abstract Two surface analysis techniques (Rutherford backscattering and surface composition by analysis of neutral and ion impact radiation) have been applied to the study of interfacial copper transport in the oxidation of polyethylene films over copper surfaces. Analysis of films oxidized several thousand hours at 4…
Refinement of the structure of rankinite.
The crystal structure of rankinite (Ca3Si2O7) was refined to an R value of 0.033 by full matrix least-squares using 1492 three-dimensional counter-measured intensity data. The crystal is monoclinic, P21⁄a, with a=10.557(1) Å, b=8.885(3) Å, c=7.858(1) Å, β=119.586(6)°, Z=4. The coordination polyhedra of calcium atoms f…
Chain conformation in molten and solid polystyrene and polyethylene by low-angle neutron scattering
Measurements of radius of gyration, <S2>½and persistence length of polymer molecules in bulk atactic polystyrene have been made by low-angle neutron scattering (LANS) from dilute solutions of protonated polystyrene (PSH) in a deuterated polystyrene (PSD) matrix. The measured values of <S2>½ lie close to those measured…
Crystal structures of silver dimolybdate, Ag2Mo2O7, and silver ditungstate, Ag2W2O7
The crystal structures of Ag2Mo2O7(I) and Ag2W2O7(II) have been determined by single-crystal X-ray analysis. Both compounds crystallize in space group P, Z= 2, with for (I): a= 6.095(3), b= 7.501(3), c= 7.681(3)Å, α= 110.4(1), β= 93.3(1), γ= 113.5(1)°; and for (II): a = 6.033(3), b= 7.051 (3), c= 7.735(3)Å, α= 73.8(1)…
Laboratory Studies of Galvanic Corrosion of Aluminum Alloys
In a systematic study of galvanic corrosion of aluminum alloys the effects of the dissimilar metal, the solution composition, and area ratio have been evaluated using galvanic current and weight loss measurements. In 3.5 percent sodium chloride, galvanic corrosion rates of the aluminum alloys 1100, 2024, 2219, 6061, a…
Combability Measurements on Human Hair
any other treatment of the COMBABILITY of HUMAN HAIR has been developed. The required instrumentation, experimental procedure, and interpretation of the data are presented in detail. The method involves the continuous recording of the forces, which oppose the motion of a comb through a swatch of hair. The data thus pr…
Solubility of long-chain n-paraffins in pentane and heptane
The solubility of the three paraffins octacosane, dotriacontane and hexatriacontane in each of the two solvents pentane and heptane have been measured in the temperature interval 10–35°C. The results follow with high accuracy a relation of the form lnx2=ΔSd/R–ΔHd/RT. The values of the parameters ΔHd and ΔSd involved i…
Dityrosine in Collagen
Dityrosine was formed by the action of peracetic acid and sodium peroxide on soluble collagens. Dityrosine was also detected in native insoluble collagen, but only from old animals. Dityrosine was identified by amino acid analysis, fluorescence absorption and mass spectra.
Neutron Diffraction Study of the Structure in Cubic CsPbCl3
The crystal structure of cubic CsPbCl 3 was reinvestigated by neutron diffraction technique at 55°C. Two structure models were examined: (i) perovskite structure with anisotropic thermal vibration and (ii) disordered structure having several potential minima for the Cs and Cl atoms, originally proposed by Møller (1959…
Synthesis and electronic absorption spectra of dicyano-derivatives of 4-diethylaminoazobenzene
The six dicyano-derivatives of 4-diethylaminoazobenzene in which the cyano-groups and the amino-group occupy different rings have been prepared, mostly by diazotisation of the appropriate dicyanoaniline, followed by coupling to NN-diethylaniline. The 2′,4′- and 2′,6′-dicyano-compounds were prepared more conveniently b…
Electron-microscope studies of carbide decay during contact fatigue in ball bearings
Structural changes in ball-bearing steels caused by rolling contact fatigue have been studied. Attention is focused on changes that occur in the various carbide constituents. Large spherical primary cementite particles gradually break up and disappear during the fatigue process. At the same time, fine carbide constitu…
Crystal growth and phase transformation in the precipitation of calcium phosphates
A survey of calcium phosphate precipitation in the neutral and slightly acidic pH range is presented. The concentration regions, within which precipitates are formed by direct crystallization and via precursor phases are defined. As examples, the kinetics of the precipitation and growth of calcium monohydrogen phospha…
Electrode and materials problems in ceramic capacitors
Ceramic capacitors with ferroelectric dielectrics are the oldest application of ferroelectrics. The materials problem to be discussed is ferroelectric in nature; it is essentially the problem of dielectric saturation, i.e., the strong decreases of the dielectric constant with DC-fields. With todays more stringent volt…
Theoretical Basis for the Determination of Corrosion Rates from Polarisation Resistance: Report prepared for the European Federation of Corrosion Working Party on ‘Physicochemical Testing Methods of Corrosion—Fundamentals and Application’
The polarisation resistance method is extensively used for corrosion rate measurement. This paper considers the theoretical conditions which must be satisfied in the measurement of polarisation resistance and the limitations of the applicability of the method in relation to the properties of the electrolyte, the kinet…
Magetic Properties of Cl<SUB>b</SUB>-Type Mn Base Compounds
The relations of neighboring Mn atoms, Mn–Mn interatomic distances and valence electron numbers to their magnetic moments and magnetic transformation temperatures in Clb-type Mn base compounds have been investigated.The magnetic interaction of these Clb-type compounds is probably dependent upon the type of neighboring…
Precipitation Behavior in Fe–Ni–Mn Martensitic Alloys
The object of this study is to investigate precipitation behavior during aging of age-hardenable Fe–Ni–Mn martensitic alloys by means of specific heat measurement, thermal differential analysis, electron microscopic observation, and X-ray and electron diffractions. The as-quenched structure before aging is lath marten…
Hydrogen and helium implantation in vitreous silica
The effects of 150–300-keV He+ and H+ implantation in vitreous silica have been examined by optical absorption spectroscopy, optical and scanning electron microscopy, gas reemission measurements, and microtopography. No surface blistering or exfoliation was observed at any implant temperature (≲200° to ∠800 °C), at fl…
Darstellung und Kristallstruktur einer neuen isomeren Form von As4S4
Abstract As 4 S 4 (II) wird durch Zusammenschmelzen von elementarem As und S im Atomverhältnis 1:1 bei 500–600°C und schnelle Abkühlung erhalten. Aus der Lösung in CS 2 rekristallisieren gelb‐orangefarbene Einkristalle in Form von sehr dünnen Plättchen. Die Kristallparameter sind a = 11,193, b = 9,994, c = 7,153 Å, β…