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Beschreibung: Reaction sintering of sodium carbaboride (NaB 5 C) was performed by heating compacts of mixtures of amorphous boron (B) and carbon black (C) powders (B/C molar ratio, 5/1) at 1173 K in Na vapor. The ceramics obtained from the compacts of B 5 /C powder mixed with a ball mill (compact density, 1.67 Mg/m 3 ) were the composites of NaB 5 C (74 mass%) and unreacted B 5 /C (26 mass%). The bulk density and bending strength of the composite ceramics were 2.04 ± 0.03 Mg/m 3 and 320.9 ± 10.4 MPa, respectively. Transmission electron microscope observation revealed that nanometer-size amorphous grains of B or C were included in the matrix of NaB 5 C.

Print ISSN: 0002-7820

Digitale ISSN: 1551-2916

Thema: Maschinenbau

Publiziert von Wiley

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In situ transmission electron microscopy of high-temperature degradation of yttria-stabilized zirconia thermal barrier coatings (2018)

Kikuchi, Shogo ; Tezura, Manabu ; Kimura, Masao ; [weitere]

Elsevier

In: Scripta Materialia. 2018; 150: 50-53. Published 2018 Jun 01. doi: 10.1016/j.scriptamat.2018.02.032.

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Publikationsdatum: 2018-06-01

Print ISSN: 1359-6462

Digitale ISSN: 1872-8456

Thema: Maschinenbau

Publiziert von Elsevier

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Heat transfer during bubble shrinking in saturated He II under microgravity condition (2015)

S Takada, N Kimura, M Murakami and T Okamura

Institute of Physics (IOP)

In: IOP Conference Series: Materials Science and Engineering

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Publikationsdatum: 2015-12-19

Beschreibung: Microgravity experiments of He II boiling were carried out using a drop tower. The process of bubble shrinking in He II in microgravity was observed by a high speed camera. The time duration of the microgravity environment less than 1 mg was about 1.3 sec. First, a large spherical bubble of about 10 mm in diameter was created by a short wire heater (Diameter 0.05 x Length 2.82 mm) for a heating time of 0.4 sec. The subsequent bubble shrinking was visualized after the heater was switched off. The time variation of the volume of bubble was estimated by image analysis. The shrinking speed of bubble was calculated from these time variation data. The shrinking speed depends on the heat flux across the liquid-vapor interface. It is found that the heat flux across the interface in microgravity can be explained by the kinetic theory with a pressure difference due to surface tension.

Print ISSN: 1757-8981

Digitale ISSN: 1757-899X

Thema: Maschinenbau

Publiziert von Institute of Physics (IOP)

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