Netsu Sokutei
Online ISSN : 1884-1899
Print ISSN : 0386-2615
ISSN-L : 0386-2615
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Volume 21, Issue 3
Displaying 1-6 of 6 articles from this issue
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  • Optimum Firing Curve for the Debinding Process of Super Hard Materials
    Kiyoshi Terayama, Takayoshi Ishiguro
    1994 Volume 21 Issue 3 Pages 111-117
    Published: July 30, 1994
    Released on J-STAGE: September 07, 2009
    DOIhttps://doi.org/10.11311/jscta1974.21.111
    JOURNAL FREE ACCESS
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    The present study is concerned with the burnout process of the organic binders from green bodies of super hard material fabricated by the extrusion forging method. The green was debinded during heating from room temperature to about 700K under inert atmosphere. After removal of the binder during high heating rate process, inner cracks were observed in thick sections. These cracks were seemed to be related to the debinding operation itself. An efficient firing curve can be designed using the data obtained by the thermal analysis and the SEM observations of sample for the debinding process of super hard materials.
    The fundamental data is thought to be useful to design the optimum firing curve without any crack formation, and to clarify the debinding mechanism of ceramics.
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  • Calorimetry of Mantle Silicate Minerals
    Hiroshi Kojitani, Masaki Akaogi, Toshihiro Suzuki
    1994 Volume 21 Issue 3 Pages 118-124
    Published: July 30, 1994
    Released on J-STAGE: September 07, 2009
    DOIhttps://doi.org/10.11311/jscta1974.21.118
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    Thermodynamic data of silicate minerals are indispensable to calculate equilibrium phase relations in the Earth's mantle. High-temperature calorimetric techniques were developed for measurements of enthalpies of solution, transition, and fusion of some silicate minerals. The heats of solution of Mg2SiO4-Fe2SiO4 olivine solid solutions were measured by lead borate solution calorimetry method. The results gave a positive mixing enthalpy for the olivines. The enthalpy of orthopyroxene-perovskite transition of MgSiO3 was obtained by differential drop-solution method. The heat of fusion of CaMgSi2O6 diopside was measured by DSC method. These thermodynamic data are used to calculate phase equilibrium boundaries at high pressures and high temperatures and are also applied to better understanding of generation of magmas.
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  • Oxygen Diffusion in Chevrel Phase Compounds
    Yoshihiro Kawakami, Hiromasa Ikuta, Hirofumi Hinode, Takashi Uchida, M ...
    1994 Volume 21 Issue 3 Pages 125-129
    Published: July 30, 1994
    Released on J-STAGE: September 07, 2009
    DOIhttps://doi.org/10.11311/jscta1974.21.125
    JOURNAL FREE ACCESS
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    Oxygen amount incorporated into Cupper chevrel phase sulfides Cu2Mo6S7.8 powder was monitored by TG. Using a kind of relaxation method, the chemical diffusion coefficients of oxygen in Cu2Mo6S7.8 was caluculated by the weight change of the specimen. The chemical diffusion coefficients of oxygen was 10-13-10-16cm2/s over the temperature range of 200-300°C and activation energy of diffusion was 157kJ/mol.
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  • Heat Capacities of Aqueous 2-Butoxyethanol in the Water-rich Region by Adiabatic Calorimetry
    Tooru Atake, Yoshikata Koga
    1994 Volume 21 Issue 3 Pages 130-133
    Published: July 30, 1994
    Released on J-STAGE: September 07, 2009
    DOIhttps://doi.org/10.11311/jscta1974.21.130
    JOURNAL FREE ACCESS
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    Heat capacities of aqueous 2-butoxyethanol at mole fraction, xBE=0.01702 and 0.01950, were measured from 271 to 313K by adiabatic calorimetry. The data at xBE=0.01702 were compared with those at xBE=0.01703 obtained by differential scanning calorimetry in paper I [Chem. Phys. Lett. 217, 245 (1994)]. They agreed within 0.2%. The temperature dependence was not the same, but similar in that the temperature derivative, ∂Cp/∂T, showed a step anomaly at the same temperature. The conclusion drawn in paper I is therefore correct. The observed small difference in the temperature dependence was attributed to the difference in thermal conductivity between the sample solution and pure water used as the reference in differential scanning calorimetry.
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  • Heat Capacity of Solid at Low Temperatures
    After the Anderson's Theory of Amorphous Solids
    Tatsuya Shirakami, Kazuya Saito, Tooru Atake
    1994 Volume 21 Issue 3 Pages 134-143
    Published: July 30, 1994
    Released on J-STAGE: September 07, 2009
    DOIhttps://doi.org/10.11311/jscta1974.21.134
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    Recent development is reviewed of experimental and theoretical studies on low-temperature heat capacity of solid, from the viewpoint of the Anderson's theory. Besides the two-level-systems assumed by Anderson et al., “additional” low-energy excitations have recently been discovered for a number of amorphous solids. Computer simulation supported existence of such excitations. They were also explained by “soft-potential” theory. Anomalous temperature dependences of heat capacity or sound velocity have also been recognized recently in such crystalline solids, as solid electrolyte, high-Tc superconductors and pure metals, etc. The behavior is similar to those of amorphous solids and can be explained by the Anderson's theory.
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  • Thermal Properties of Biodegradable Polyurethanes
    Shigeo Hirose, Ken Kobashigawa, Hyoe Hatakeyama
    1994 Volume 21 Issue 3 Pages 144-146
    Published: July 30, 1994
    Released on J-STAGE: September 07, 2009
    DOIhttps://doi.org/10.11311/jscta1974.21.144
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