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  • 1
    Digitale Medien
    Digitale Medien
    Shock and release wave properties of yttria-doped tetragonal and cubic zirconia (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 4868-4874 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Velocity interferometry diagnostics are used to monitor transmitted compressive shock and release waves in yttria (Y2O3)-stabilized tetragonal and cubic zirconia. In tetragonal zirconia compressive yielding due to lattice slip or lattice instability is observed at 13–17 GPa and again at 30–31 GPa. This represents an additional fine structure to the dynamic compression of zirconia that has not previously been observed. A correlation with initial sample density is seen for the lower-amplitude yield. A single yield over the range of the data occurs at 5–6 GPa for cubic zirconia. Approximately 4%–6% porosity in the cubic zirconia accounts for initial yield somewhat lower than earlier studies. From unloading wave profile measurements, initial release wave velocities at the Hugoniot state and stress derivatives of these data are determined. Release moduli data increase monotonically over a Hugoniot stress range of 11–45 GPa. A stress derivative of this data of K'l = 1.85 is obtained. Stress derivatives determined directly from the initial release slope of individual profiles are significantly higher and suggest deformation or phase transformation kinetics on release. Release waves from Hugoniot states of 11–13 GPa suggest formation of a rarefaction shock and may imply a dynamic stress-induced transformation not indicated by the shock profile. A tensile spall strength of 1.6 GPa was determined for the tetragonal zirconia. This high value may be related to the large fracture toughness of this transformation-toughened ceramic.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.350631
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  • 2
    Digitale Medien
    Digitale Medien
    A new biodegradable polydepsipeptide microsphere for application in drug delivery systems (1990)
    Springer
    Colloid & polymer science 268 (1990), S. 726-730 
    Details
    ISSN: 1435-1536
    Schlagwort(e): Sequentialpolydepsipeptide ; polymericmicrosphere ; poly(L-alanyl-L-alanyl-γ-ethyl L-glutamyl-L-lactyl) ; solventevaporationprocess ; drugdeliverysystem ; malerat ; ratprostate ; 17Β estradiol
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau
    Notizen: Abstract A sequential polydepsipeptide containing a tripeptide sequence L-alanyl-Lalanylγ-ethyl L-glutamyl and anα-hydroxy acid L-lactic acid, poly(Ala-Ala-Glu(OEt)-Lac), was synthesized to prepare the microspherical particles by the solvent evaporation process. In this case, the solvents play the most important role for the preparation of polydepsipeptide microspheres and, as an example, when 200 mg of the polydepsipeptide dissolved in 10 ml of 98/2% chloroform/dichloroacetic acid mixture was stirred at 400 rpm and 30
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01411103
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  • 3
    Digitale Medien
    Digitale Medien
    Synthesis of the WC-type tantalum nitride by mechanical alloying (1994)
    Springer
    Journal of materials science 13 (1994), S. 174-176 
    Details
    ISSN: 1573-4811
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00278152
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  • 4
    Digitale Medien
    Digitale Medien
    Synthesis of the B1-type tantalum nitride by shock compression (1993)
    Springer
    Journal of materials science 28 (1993), S. 3439-3443 
    Details
    ISSN: 1573-4803
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract B1-type tantalum nitride (polycrystalline bulk state) was synthesized by shock compression. Shock-compression recovery experiments of the porous sample of tantalum nitride with a hexagonal structure (CoSn-type) were performed in the impact-velocity range up to 1.5kms−1. The instrumental chemical analysis, X-ray and electron diffraction experiments were carried out on the recovered tantalum nitride sample and the combustion-synthesized B1-type sample for comparison. The recovery rate of the B1 -type phase increased with increasing porosity, impact velocity and impactor thickness; among these above all the effect of porosity was most remarkable. Almost 100% recovery rate was achieved for the powder of 70% porosity impacted by a 2 mm thick tungsten plate with velocities above 1.4 kms−1. It was confirmed by chemical analysis that the nitrogen content did not change by shock compression. The chemical formulae of the shock-synthesized and combustioned-synthesized B1-type phases were estimated to be TaN0.96–0.99 and TaN1.13–1.16, 1.27–1.30, respectively. The lattice parameter of the shock-synthesized B1 -type (Fm3m) phase was ao=0.43363- + (1) nm. The results of X-ray and electron diffraction experiments also supported that the shock-synthesized B1-type tantalum nitride has a good stoichiometry compared with the combustion-synthesized ones.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01159819
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