Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystalline-Amorphous Phase Transition of Poly(ethylene Glycol)/Cellulose BlendXue-Hai Liang, Yuan-Qiang Guo, Lian-Zhen Gu, and En-Yong DingCite this: Macromolecules 1995, 28, 19, 6551–6555Publication Date (Print):September 1, 1995Publication History Published online1 May 20…
Cyclic fatigue‐crack propagation behavior in monolithic silicon nitride is characterized in light of current fatiguecrack growth models for ceramics toughened by grainbridging mechanisms, with specific emphasis on the role of load ratio. Such models are based on diminished cracktip shielding in the crack wake under cy…
Abstract Recently, the mechanism of shear induced crystallization in melts of isotactic industrial polypropylene has been unravelled for sufficiently high rates of shear [1]. This was achieved with the aid of, what we called, short term shearing. This shearing was applied in a rectangular duct of large aspect ratio. T…
The mineralogy, geochemistry and geotechnical properties of clay samples in Ariake Bay, Japan are presented. The mineralogy and geochemistry are discussed in terms of depositional and post-depositional processes, and the correlations of the clay mineralogy and geochemistry with the geotechnical properties were examine…
An intermediate reaction in the synthesis of ZrB 2 powder by the reduction of ZrO 2 with B 4 C and carbon was confirmed through both thermodynamical calculation and experimental results. Because the intermediate product B 2 O 3 was volatile, excess boron should be added to compensate for the boron loss in order to pre…
Stokesian dynamics computer simulations were performed on monolayers of equally sized spheres. The influence of repulsive and attractive forces on the rheological behavior and on the microstructure were studied. Under specific conditions shear thickening could be observed in the simulations, usually together with a ch…
Amorphous boron carbide (a-B1−xCx) is believed to have an icosahedron-based random network. In this paper, vibrational properties of a-B1−xCx films are studied by IR and Raman spectra, placing particular emphasis on the interpretation of the most prominent 1100-cm−1 band associated with the B–C bond. The 1100-cm−1 ban…
The Curie point ( T C ) of BaTiO 3 was earlier reported to be 120° C and has been recently believed to be 130° C. Some experiments have been performed here to reconfirm the T C . Firing conditions used for preparing BaTiO 3 were examined first with the use of pure BaCO 3 or Ba(NO 3 ) 2 and TiO 2 . The x -dependence of…
Abstract In this study, the viscoelastic behavior of a microcellular plastic was investigated with particular emphasis on the effect of cell size. A poly(ethylene terephthalate) resin containing a polyolefin nucleating agent (CPET) was selected as the test material. In order to investigate the effect of cell size, mic…
The atomic structure of the interphase boundary enclosing an α (hcp) precipitate formed from the β (bcc) matrix in a Ti-Cr alloy was examined. All the interfaces of an α lath exhibit continuity of atomic planes between the matrix and the precipitate and thus are considered to be coherent or semicoherent. Such observat…
Over the past several years, numerous relationships between fiber properties and yarn performance have been developed. The classical method for predicting yam performance is statistical analysis such as linear multiple regression. Neural networks are now a subject of interest in many fields and a tool for many areas o…
The kinetics and mechanism of reaction of glassy carbon with a pure silicon melt or a Si + Mo melt were investigated. The results showed that the growth of a continuous reaction‐formed SiC layer followed a fourth‐power rate law in the temperature range of 1430° to 1510°C. A model that could explain the fourth‐power ra…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSilica-Supported Zirconia. 1. Characterization by Infrared Spectroscopy, Temperature-Programmed Desorption, and X-ray DiffractionZ. Dang, B. G. Anderson, Y. Amenomiya, and B. A. MorrowCite this: J. Phys. Chem. 1995, 99, 39, 14437–14443Publication Date (Print):September 1, 19…
Abstract Fifteen kinds of mullite/SiC samples with different microstructures were prepared in order to examine the effect of Sic volume% and Sic grain size on mullite morphology and mechanical properties. Special attention was paid to the effect of heat‐treatment on fracture stress. It is shown that these materials ha…
The determination of formation and migration energies of point and clustered defects in SiC is of critical importance to a proper understanding of atomic phenomena in a wide range of applications. We present here calculations of formation and migration energies of a number of point and clustered defect configurations.…
The characterization of solid solutions by conventional X-ray diffraction (XRD) is critically assessed using the example of Cu-Co alloys. In particular, the limits of this technique for investigating compositional inhomogeneities are discussed. Coherent Cu-Co multilayer films are taken as a model for a decomposed soli…
The effect of thermal expansion mismatch stress between silicon nitride and different grain boundary phases on the fracture toughness of silicon nitride was investigated. Different sintering aids in the Y‐Mg‐Si‐Al‐O‐N system produced silicon nitride specimens with very similar micro‐ structures but different grain bou…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComplex composition distribution of poly(3-hydroxybutyrate-co-3-hydroxyvalerate)Naoko Yoshie, Hiroyuki Menju, Hidenori Sato, and Yoshio InoueCite this: Macromolecules 1995, 28, 19, 6516–6521Publication Date (Print):September 1, 1995Publication History Published online1 May 2…
This paper presents a survey of the factors governing the performance and operation of high temperature subsupersonic metal atom beam sources. After an initial statement of the requirements placed on such sources a section is presented which considers the factors determining atomic beam intensities and profiles. The s…
We have performed depolarized dynamic light scattering measurements on suspensions of colloidal spherical particles made of a fluorinated polymer. Electrostatic interactions are screened by adding salt, so that the particles behave as hard spheres. By suspending the particles in an index-matching solvent (18% urea in…