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  • 1985-1989  (9)
  • 1988  (3)
  • 1986  (6)
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Years
  • 1985-1989  (9)
Year
  • 1
    Electronic Resource
    Electronic Resource
    X-ray determination of the atomic displacements in NbC0.72 (1986)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 19 (1986), S. 417-419 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Integrated X-ray intensities of Bragg peaks have been measured with an NbC0.72 single-crystal which contains a large number of non-stoichiometric carbon vacancies. By standard structural analysis the mean-square displacements were determined to be (u2Nb) = 0.0041 (7) Å2 for Nb atoms and (u2C) = 0.0111 (20) Å2 for C atoms. This (u2Nb) is comparable to the value of 0.0045 Å2, extrapolated from the compositional dependence of (u2Nb) proposed by Metzger, Peisl & Kaufmann [J. Phys. F. (1983). 13, 1103–1113]. It was confirmed that the existence of carbon vacancies induces larger static displacements of neighbouring niobium atoms, and the contribution of thermal displacements to the observed (u2Nb) appears to be rather small in a non-stoichiometric niobium monocarbide.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S002188988608901X
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Syntheses and thermal degradation behaviours of saponite-α-naphthylamine complexes: effects of substitution of OH in saponite by fluorine (1988)
    Springer
    Journal of materials science 23 (1988), S. 1764-1768 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Five saponites with various substitution degrees of the constituent OH by fluorine were subjected to complex formation with α-naphthylamine to examine the effect of substitution on the stabilities of the resulting complexes. Saponite with a larger substitution degree intercalated a lesser quantity of a-naphthylamine and was broken down more easily in the reaction process. The complexes were subsequently heated in nitrogen to examine their thermostabilities. The thermostability of saponite was enhanced with increasing degree of substitution. All saponite, especially those without substitution, enhanced their thermostabilities by intercalating with α-naphthylamine. The reasons for these phenomena are briefly discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01115720
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    SEM study of the fractured surfaces of films and blocks prepared from montmorillonite and its complex with α-naphtylamine (1986)
    Springer
    Journal of materials science 21 (1986), S. 1219-1226 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Four samples were heated under nitrogen to determine the relations between heat-treatment conditions and the topographies of the fractured surfaces of the resulting samples. The samples used were thin films (several 10μm thick) of lithium-montmorillonite (Mont) and its complex (MNC) withα-naphtylamine, and the blocks of raw montmorillonite and its complex withα-naphtylamine (MNC). Two characteristic topographies were obtained from MNC film. They were of a very dense structure with the memory of a layered structure after heating to about 1173 K at 1 or 5 K min−1, and a homogeneous fine porous structure after heating to 1173 to 1273 K at 40 K min−1. An unique porous structure was also obtained from MNC block, several millimetres thick by heating to 873 K for 1H. However, Mont, in both film and block, was not suitable for preparation of the homogeneous structure, regardless of porous or dense structures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00553254
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Some properties of a condensed polynuclear aromatic resin (COPNA) as a binder for carbon fibre composites (1986)
    Springer
    Journal of materials science 21 (1986), S. 2027-2032 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A new thermosetting resin consisting of condensed aromatic nuclei cross-linked with methylene bridges was prepared from a mixture of pyrene, phenanthrene and 1,4-benzenedimethanol by heating above 393 K. This resin, named COPNA, adheres well to carbon fibres, and the carbon fibre/resin composite (CFRP) prepared by using this resin as a binder exhibits no remarkable changes in mechanical properties after heating at 523 K for 10 h and 573 K for 2h. The CFRP specimens were converted into carbon fibre/carbon composite (CFRC) by further heating up to 1 273 K without any trouble.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00547943
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  • 5
    Electronic Resource
    Electronic Resource
    Thermal degradation behaviour of fluorosaponite-α-naphtylamine complex under nitrogen (1986)
    Springer
    Journal of materials science 21 (1986), S. 1227-1232 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The layer-type complex of fluorosaponite andα-naphtylamine (F-SNC) was heat treated below 1473 K under nitrogen to investigate its thermal degradation behaviour. The most striking characteristic of the behaviour is that the layered structure of F-SNC remained considerably unchanged up to temperatures as high as 1273 K. In order to derive the clay-carbon layer-type complex from the clay-organic compound complex, the degradation behaviour of F-SNC was compared with those of other complexes reported previously. As a result, the most important factor to arise from this work is to use a layered-structural clay with high thermal stability and to intercalate organic compounds, with high carbon yield, as much as possible.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00553255
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  • 6
    Electronic Resource
    Electronic Resource
    A porous material prepared from the layer-type complex consisting of montmorillonite and α-naphthylamine (1986)
    Springer
    Journal of materials science 21 (1986), S. 2908-2914 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Aqueous mixtures of montmorillonite and α-naphthylamine with various mixing ratios were kept at 353 K for 3 days with stirring to convert them into the layer-type complex (MNC) consisting of both components, and then dried at 403 K. The resulting blocks, several centimetres in size, were heated below 1473 K under nitrogen. The addition of α-naphthylamine (NA) in the equivalent amount to the cation exchange capacity of montmorillonite resulted in the most attractive porous material which includes homogeneous pores of ∼35nm radius and exhibits a maximum pore volume of 0.8 ml g−1 at 873 K. The samples containing greater and lesser amounts of NA gave a very brittle block and a less porous block after heating to high temperature, respectively. The materials obtained were also characterized by the waved card-house structure. The amount of NA added and the heat-treatment temperature did not vary the pore size so widely.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00551510
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  • 7
    Electronic Resource
    Electronic Resource
    Effects of oxidation on the structure of porous material prepared from a montmorillonite-α-naphthylamine complex (1986)
    Springer
    Journal of materials science 21 (1986), S. 4481-4484 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A porous material was prepared by carbonizing the layer-type complex of montmorillonite-αnaphthylamine at 873 to 1273 K and it was then subjected to heat-treatment in air to examine the effects of oxidation on the porous structure. After oxidation at 1273 K for 10 h the pore volume decreased remarkably, with a broadening of the pore size distribution. Oxidation at 873 or 1073 K, on the contrary, increased the pore volume with a small increase in pore size. The mechanisms of these oxidation behaviours are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01106575
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  • 8
    Electronic Resource
    Electronic Resource
    Thermal degradation behaviour of the layer-type complexes of montmorillonite/α-naphthylamine, saponite/α-naphthylamine and their mixtures (1988)
    Springer
    Journal of materials science 23 (1988), S. 4066-4070 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Samples of montmorillonite/α-naphthylamine complex (MNC), saponite/α-naphthylamine complex (SNC) and their mixtures were heated at temperatures below 1473 K under a nitrogen atmosphere to examine macroscopic structural change and crystalline phases deposited after pyrolysis. SNC resulted in a dense structure after pyrolysis. Heating of samples of MNC/SNC mixtures gave a porous structure which became dense as the proportion of SNC increased. No porosity measured by the mercury porosimeter was detectable in samples pyrolysed from MNC containing more than 25% SNC. After pyrolysis, the MNC/SNC mixtures gave crystalline phases which were never formed in the pyrolysed pure MNC and SNC. The formation of these crystalline phases was explained by reference to the chemical compositions of the mixtures and the phase diagram.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01106836
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  • 9
    Electronic Resource
    Electronic Resource
    Changes of tensile strength and electrical resistivity of taeniolite/acriflavine complex film by carbonization (1988)
    Springer
    Journal of materials science 7 (1988), S. 985-986 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00720750
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