Advanced technology of brazing copper‐steel and steel sections
"Advanced technology of brazing copper‐steel and steel sections." Welding International, 9(6), pp. 473–474
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CURIE TEMPERATURE AND BAND STRUCTURE OF METALLIC FERROMAGNETS
A soft-spin Heisenberg model is used to investigate the Curie temperature of elementary iron and iron-rich intermetallics such as Sm2Fe17. In the localized limit the mean-field solution of the classical Heisenberg model is reproduced, while quasi-localized perturbation theory accounts for band-structure effects. An ex…
Stability of Two Stratified Liquid-metal Layers in an Uniform DC Magnetic Field.
The effects of a horizontal and a vertical DC magnetic field on the Rayleigh-Taylor instability between two inviscid liquid metals were studied by linear analysis. Since the dispersion relation in the vertical field is in the same form as that in the horizontal field, the stability characteristics of the interface are…
Twin structure of Sodium Hydrogen Oxalate Monohydrate
Abstract Twin structure of triclinic sodium oxalate monohydrate was determined by means of X‐ray techniques. The twin is formed by reticular pseudomerohedry, with [101] as twin axis and ( 1 01) as contact plane.
Dimensionless Groups in Textile Mechanics and the Stories They Tell
This paper introduces ten dimensionless groups formed from material properties and machine variables by analysis of the energies involved. These groups can be used as independent variables instead of the individual parameters to represent and analyse the test results with far greater efficiency.
Alumina Based Ceramic-Matrix-Composites: Some Recent Developments
The Ceramic-Matrix-Composites (CMCs) have come into prominence for structural applications because of their superior mechanical properties both at room temperature and at elevated temperatures. In conventional processing route of pressureless sintering, the rigid reinforcement phase (particulate or whisker) severly re…
Polysulfide Systems for Environmental Protection
Legislation in most advanced industrial countries is demanding more stringent protection of the water table. Chemical spillage and the diffusion of chemicals into the ground, leading to contamination of water, is being strictly controlled. A good example of these regulations is the containment of spillages of gasoline…
Specific Heats and Grüneisen Constant of Aluminosilicate Glasses Containing Rare-Earth Oxides
Rare-earth alumino-silicate glasses were prepared from Shirasu (volcanic ash) and yttria concentrate as the main starting materials. Specific heats and elastic constants of these glasses were measured at room temperature. Using these values and previously measured values of thermal expansion coefficients and densities…
Laser desensitisation of the heat affected zone (HAZ) in austenitic stainless steels
Summary The aim of this work is to promote a basic knowledge of the phenomenon of sensitisation in the heat affected zone (HAZ) in austenitic stainless steels and provide information on a method of desensitisation using laser beams without impairing other types of corrosion resistance (pitting corrosion resistance). S…
PRESSURELESS-SINTERED BORON NITRIDE WITH LIMITED CONTENT OF BORIC OXIDE
Elemental boron and boron nitride powders were mixed and pressureless-sintered in nitrogen. The structure and mechanical parameters of the ceramics were investigated and compared with those obtained from boron nitride powder free of the elemental boron. A positive effect of the addition of boron was found in increasin…
New Pressing Technique for Preparation of small-Calibre Shaped Charge
Explosive filling in small-calibre shaped charges is carried out by pressing techniques. At present, pressing is carried out by single action method which suffers a drawback of density gradient in the charge from the face of the tool. A new method-double action pressing-has been established which eliminates this probl…
All-dielectric High-efficiency Reflection Gratings Made with Multilayer Thin-film Coatings
It is well known that a high reflectivity mirror can be made by coating multiple pairs of dielectric thin films of high refractive index contrast and quarter wave optical thickness onto an optically flat surface. The advantages of a multilayer dielectric mirror over a metallic first surface mirror include high reflect…
Electrochemical sensor for monitoring atmospheric corrosion of zinc alloy coated steel
The construction and operation of an electrochemical sensor capable of monitoring the corrosion performance of zinc alloy coated steel under controlled atmospheric conditions are described. Sensors were fabricated from zinc and zinc alloy coated steel sheet with and without chromate conversion treatments. Corrosion be…
Anodic and Cathodic Behaviour of α-Brass in Na<SUB>2</SUB>SO<SUB>4</SUB> Solutions
The anodic oxidation and corrosion of α-brasses (13.2 and 32.2% Zn) were investigated in Na2SO4 solutions under different experimental conditions using cyclic voltammetric technique and complemented with X-ray diffraction analysis. The anodic responses of the brass display two potential regions. The first anodic regio…
Effects of Atmosphere on Sintering of Alumina
The effect of ambient atmosphere on the sintering of oxides was studied ever since the first experiments on sintering of aluminium oxide spheres were married out Several effects of atmosphere on sintering have been found to be important. These depend on the nature of interaction, whether physical or chemical, of the a…
New Chiral Dopants with an Optically Active Six-membered Ring for Ferroelectric Liquid Crystals. Effect of Direction of the Dipole Moment on Spontaneous Polarization
New chiral dopants containing an optically active six-membered ring with a cyano group were synthesized. New chiral dopants containing an optically active six-membered ring with an epoxy group were also synthesized and the effect of the direction of the dipoles on spontaneous polarization were discussed using them. Th…
Purification of Sepiolite and Palygorskite.
Methods of purifying sepiolite-paygorskite series were reviewed and discussed under the two purification categories: extraction of elements and elimination of minerals.A number of previous works focused on the extraction of elements from sepiolite by acid treatment because knowledge gained from basic studies on dissol…
On the energy losses of hot worked Nd-Fe-B magnets and ferrites in a small alternating magnetic field perpendicular to a bias field
Torsion pendulum magnetometer measurements on ferrites and on neodymium-iron-boron permanent magnets are presented. The damping of the oscillation of the pendulum leads to information on the magnetic energy losses of the magnets in a small alternating magnetic field applied perpendicular to a bias field. The origin of…
The SrO-Cr2O3-La2O3 Phase Diagram and Volatility of La1−xSrxCrO3 (x = 0 – 0.3) in Comparison to Cr Base Interconnect Alloys
The thermodynamic properties and volatility of SOFC materials is an important aspect in order to guarantee the necessary long term operation of an SOFC. Contributions to the SrO-Cr 2 O 3 -La 2 O 3 phase diagram were experimentally determined for the reducing and oxidizing conditions present in SOFCs. Moreover, the vap…
Fracture Toughness and Subcritical Crack Growth of Small Crack in Silicon Nitride at Room Temperature
The effect of microstructure in silicon nitride on fracture toughness and Subcritical crack growth (SCG) behavior at room temperature was investigated. Three kinds of silicon nitride materials containing 5 mass% of Y2O3 and Al2O3 were sintered under different conditions, and they showed different microstructures. Frac…