Materials Literature
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L'étude de la trempe des lacunes dans le nickel montre d'une part l'influence de l'oxydation sur l'efficacité de la trempe, et d'autre part que l'agglomération des lacunes en cours de trempe conduit à une augmentation de la limite élastique du matériau.
Infrared spectra of whewellite (calcium oxalate monohydrate) have been recorded at 300 and 90°K in the 4000–2000 cm−1 range in order to investigate the factors determining the band breadth and structure. On the basis of the HOD and bending D2O fundamentals details of the whewellite crystal structure concerning the sym…
A Homologous series of fourteen Schiff base compounds of the following type was prepared by condensing 4-n-alkoxy-1-naphthaldehydes with cholesteryl p-aminobenzoate,and its mesomorphic bahaviour was studied.
Recently a number of experiments have been carried out on a STEM which included a multipole corrector for primary spherical aberration. The results of these experiments indicate that the correction of primary spherical aberration with magnetic multipoles is beset with very serious difficulties related to hysteresis. T…
The aim of the present work is to study the sites of rust formation and mechanism of rusting on 18 Cr-Ti steels under the salt spray test. Rusts are preferentially initiated at cubic inclusions or precipitates with titanium (esp. TiN-TiC-Ti4C2S2 system, TiO2 (or Al2O3) -TiN-TiC-Ti4C2S2 system, TiN-TiC system). But no…
Adhesive forces generated at a contact point between spherical and plate specimens made of the same material due to water vapor adsorption on them were measured for four samples by using an electrobalance. The samples used here are commercial soda-lime glass bead, granulated urea and potassium halides, i.e. KCl and KB…
Flexural stress relaxation (FSR) and flexural internal friction (FIF) techniques were employed to measure the time-dependent deformation of boron fibers from −190 to 800°C. The principal specimens were 203-μm (8 mil) diameter fibers commercially produced by chemical vapor deposition (CVD) on a 13-μm tungsten substrate…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of isotopic oxygen exchange between water and vanadium(V) in basic mediaR. Kent. MurmannCite this: Inorg. Chem. 1977, 16, 1, 46–51Publication Date (Print):January 1, 1977Publication History Published online1 May 2002Published inissue 1 January 1977https://pubs.acs.o…
The transformation of kaolinite to mullite is reviewed. The thermal effects observed during the transformation and the phases which accompany these effects are discussed in the light of the existing concepts. The chemical, thermal, X-ray, electron-optical, infrared, orientational and crystallographic evidences are adv…
Widely different procedures for the processing of PVC have proved themselves and have succeeded in practice on the basis of the special physical and chemical properties of PVC. In this connection a distinction must be made between the processing of plasticized PVC and the relatively difficult processing of rigid PVC.…
The current models for SCC are described and evaluated in terms of existing fractographic evidence. It is concluded that the film-rupture model, which is considered to advocate propagation by continuous anodic dissolution, is consistent with the fractography of the majority of intergranular failures but cannot be reco…
Abstract The effect of uniaxial stress along [100] and [111] on the Raman‐active phonon of Mg 2 Sn is reported. The effect of a [111] stress on the corresponding phonon of Mg 2 Si and on the Fröhlichinteraction‐induced LO and 2LO lines of this material is also presented together with complementary measurements of the…
Aluminium billets of two purities (99.999 and 99.7%) were extruded at 250°C using commercial equipment to produce 10 mm rod (extrusion ratio, 25:1). On air cooling, the resulting microstructures were investigated using optical and transmission electron microscopy, including Kikuchi line analysis. Thefine microstructur…
Brillouin shifts and the line widths in NH 4 HSO 4 which concern the longitudinal phonons propagating along the a * , b and c directions were measured in the temperature range -115∼30°C. The Brillouin shift caused by the pure longitudinal acoustic phonons propagating along the b axis shows an abrupt decrease and the l…
A series of coloured compounds of general formula CsPb1–xSnxX3(X3= Br3 or Br2Cl) has been prepared. X-Ray and Mössbauer data show that the compounds have highly symmetrical tin–lead environments. Their electronic resistivity and optical-reflectance spectra are interpretable in terms of the partial filling of electroni…
An investigation of hydrogen diffusion in a martensitic Type 403 stainless steel subjected to heat treatment was carried out in an attempt to establish the effect of heat treated microstructure on diffusivity and solubility of hydrogen. The diffusivity and solubility vary with the microstructure and the diffusion coef…
The salt Na2[Ru(NO)(NO2)4(OH)] reacts with barbituric acid in water to give Na[Ru(H2va)3](H2va–= bidentate violurate), and with 1,3-dimethylbarbituric acid to give Na[Ru(dmva)3](dmva–= bidentate 1,3-dimethylviolurate). The complexes react with Na[NO2] in acidic aqueous solutions to afford a series of novel diamagnetic…
Ultraviolet photoemission spectroscopy (UPS) has been used to study the valence-band electronic structure of $2H\ensuremath{-}\mathrm{M}\mathrm{o}{\mathrm{S}}_{2}$. The samples were cleaved or heated in ultrahigh vacuum of \ensuremath{\sim} 1 \ifmmode\times\else\texttimes\fi{} ${10}^{\ensuremath{-}10}$ Torr to achieve…
ポリスチレンの熱分解反応を流通系充てん層反応器で実施するとともに,生成物の同定を行なった。熱処理試料(280℃/hr)と原試料の熱分析では,低温度領域と高温度領域の二段階反応が存在し,熱劣化の影響は低温度領域の活性化エネルギーに顕著に示された。原試料54.7kcal/mol,熱処理試料30.2kca1/molが得られた。処理温度2500C,1時間以下では原試料とかわらない。同定した成分は20種類,そのなかの主要なものは,α-メチルナフタレン,ビフェニル,1,2-ジフェニルプロバン,1,2-ジフェニルー1-プロペン,1,3-ジフェニルー1-プロペンである。不揮発成分は500℃ではワヅクス,350。Cでは二量体相当留分のグリース状であ…
Abstract The desupersaturation of nickel ammonium sulphate aqueous solutions, during the precipitation of the hydrated salt, has been followed by refractive index measurements. The addition of seed crystals has a considerable effect on the desupersaturation process: the induction and latent periods and the crystal siz…