Materials Literature
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Abstract The new compound Na 8 SnSb 4 has been prepared from appropriate mixtures of the elements at 700 °C in evacuated silica ampoules coated with glassy carbon. The structure has been determined by single crystal X-ray diffraction data (cubic, space group Fd3m, a - 1481.6(3) pm, Z = 8, R = 0.044 for 263 reflections…
The thermal expansion of Y 2 SiO 5 crystals has been measured for the principal crystallographic directions and two orthogonal directions in the (010) plane in the temperature range 25° to 200°C. This monoclinic crystal has strongly anisotropic expansions with coefficients which range from 0.6 × 10 −6 /°C for [100] to…
The PTC effect in KNbO3, KBiTi2O6, NaBiTi2O6, Pb2FeNbO6, Pb2FeTaO6 having phase transitions of different types (FE-PE, FE-FE and FE-AFE) has been investigated. In oxides possessing both the FE-PE and the FE-FE phase transition, a ρ(T) anomaly, depending on the values of the donor concentration and the surface state de…
Polyphenylene sulfide (PPS) and Polyetherether ketone are high performance engineer ing thermoplastics with a unique combination of excellent thermal, mechanical and en vironmental properties. This paper presents the thermogravimetric properties of PPS and PEEK resins and carbon fiber reinforced composites. The additi…
Abstract The interpretation of soil tests for K in highly weathered soils may be improved if the K buffering power is considered in addition to extractable K. This study was conducted to determine if cation exchange capacity (CEC) and humic matter (HM) should be included in the development of more meaningful K availab…
Creep tests of Ni-base heat resistant alloys (Hastelloy XR and XR-II) were conducted at 950°C in four kinds of helium environments with different impurity compositions in order to examine the effect of decarburizing environment.Both alloys were decarburized in a helium environment with low partial pressure of oxygen a…
Larger carbides inherent in high-alloy steels can initiate surface peeling failures and cause other raceway distress which affects bearing performance under thin lubrication film operating conditions. They can also contribute to the microstructural alteration in conventional subsurface rolling contact fatigue. Carburi…
The computer simulation of galvanic corrosion systems has been shown to provide accurate information that can be used to improve design and avoid costly failure. The systems capability to model any general geometry coupled with the ability to accept a wide variety of forms of polarization data enables its effective us…
Single crystals of boron-containing apatite (BAP) were grown by standard flux growth technique with excess B2O3 as flux. A mixture with the composition 35CaO-5P2O5-60B2O3 (wt%) was heated at 1200°C for 10 hours and then cooled at a rate of 8.3°C/h. Hexagonal prismatic crystals (0.3mm×0.3mm×11mm) were obtained. The che…
A technique is presented for digital computer simulation of the interaction between a polluted insulator and a high-voltage, direct-current test source. Both uncontrolled and feedback-controlled voltage-double sources are considered. The polluted insulator is represented by one or more arcs in series with the wet cond…
Steels used in rolling bearing applications require high reliability and consistency. The SKF MR process developments carried out at Ovako Steel have led to the design of cleanliness specifications which correspond to such requirements. The reduction of oxygen content and harmful nonmetallic inclusions have led to sig…
Abstract The nostoichiometry and point‐defect structure of PbTe was investigated by various methods including carrier‐concentration, lattice‐constant, positron‐annihilation and vapour‐density measurements. The results are discussed in comparison with data published by other authors. New aspects are obtained especially…
R2Zr2O7 and (R1-xEux)2Zr2O7 (R=La, Pr, Sm, Eu, Gd, Tb, Er, Y) were prepared at 1600°C in air and their fluorescence properties were studied. The crystal structures of these compounds were pyrochlorite-type for the light rare earths and CaF2-type for the heavy rare earths, respectively. However, Gd2Zr2O7 and Y2Zr2O7 sh…
Chapter 1 Classification and Properties of Materials Chapter 2 The Structure of Materials Chapter 3 Equilibrium Diagrams Chapter 4 Plain Carbon and Alloy Steels Chapter 5 Heat Treatment of Steel Chapter 6 Case Hardening of Steel Chapter 7 Tool Steels Chapter 8 Stainless Steels and High Temperature Alloys Chapter 9 Cas…
The zeolities gmelinite and ZSM-12 are synthesized using a cationic polymer template, both cases illustrating the templating effect; magic-angle 13C n.m.r. spectra provide direct evidence that the polymer is retained in the pore system of these zeolites.
A new method has been developed for acetylating cellulose using acetic acid. It has been found that cellulose is easily acetylated by acetic acid (AcOH) with the system of pyridine (Py) containing p-toluenesulfonyl chloride (TsCl) or Methanesulfonyl chloride (MsCl). Especially, rayon was acetylated to about 3.0 of D.…
The microwave and optical scattering formulations are reviewed, a relationship between them at the same wavelength is presented, and the measurement conditions for obtaining range-independent and equipment-independent values are discussed. It is shown that the physical mechanism of scattering of electromagnetic beams…
The amination reactions of chloromethylated polystyrene with N,N-dimethyldodecylamine, N,N-dimethyltetradecylamine, and N,N-dimethylhexadecylamine were studied. The physical properties, particularly the solubility properties of the resulting polymers, are influenced by the hydrophobic properties of the long alkyl chai…
Absolute measurements of the 200 reflection in Si and Ge at various azimuthal orientations are compared with N-beam calculations of the integrated intensity. All of the non-zero integrated intensity is accounted for by multiple-beam scattering. The measurements match the calculations on the assumption that F200 = 0.
The underlying principles of the transfer‐matrix programs GIOS and COSY are outlined. Especial emphasis is given to the calculation of particle trajectories and of image aberrations. Input and output of a second‐order calculation of GIOS is shown.