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  • 1
    Electronic Resource
    Electronic Resource
    Oxidation Behavior of Tantalum Boride Ceramics (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 124-126 (June 2007), p. 819-822 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: The oxidation behavior of tantalum diboride (TaB2) powder at high temperature wasinvestigated in order to determine the possibility of the use of advanced high temperature structuralmaterials. Unfortunately, monolithic TaB2 were known to be chemical stability up to hightemperatures. To date, there have been few reports regarding the properties of TaB2 ceramics. Thesamples were oxidized at room temperature to 1273 K for 5 minutes to 25 hours in air. The weightchanges were measured to estimate the oxidation resistance. The oxidation of samples oxidized forshort oxidation time of 5 minutes started at 873 K, and the weight gain increased with increasingoxidation temperature. On the other hand, at the oxidation time of above 1 hour, a maximum weightgain value at 973 to 1073 K was observed. However, even if the oxidation temperature was increasedan additional weight change slightly occurred. The weight gain of the sample oxidized at 1273 K for 5minutes to 25 hours was about 40 to 20 % of the theoretical oxidation mass change. According to thepowder X-ray diffraction date, the oxidized TaB2 sample was changed to Ta2O5 at 873 K. Finally, theTaB2 showed a good oxidation resistance at high temperature, because the surface film of tantalumoxide (Ta2O5) formed by oxidation acted as an oxidation resistant layer
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.124-126.819.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Absorption and Preservation of Bentonite Containing Smectite (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 569 (Jan. 2008), p. 241-244 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The Na-bentonite with contained smectite was fabricated in order to observe theirabsorption and preservation about water. Absorption of fabricated specimens in the water andpreservation of absorbed samples in the drying machine at 323 K was measured. It was obtained thatabsorption had been decreasing with increasing smectite. Absorption of As-received Na-bentonitewas higher than absorption of As-received smectite. The preservation has been also decreased withincreasing smectite was obtained. Na-bentonite with contained smectite were investigated the goodabsorption and preservation when the Na-bentonite containing smectite 5 mass %
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.569.241.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Absorption of Bentonite Compact with Absorbent Polymer (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 569 (Jan. 2008), p. 245-248 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The Na-bentonite compact with absorbent polymer was fabricated in order to observe theirabsorption and preservation about water. Absorption of fabricated specimens in the water andpreservation of absorbed samples in the drying machine at 323 K was measured. It was obtained thatthe absorption had been increasing with inhancing absorbent polymer. Absorption of As-receivedNa-bentonite was lower than absorption of As-received absorbent polymer. The preservation hadbeen also increased with absorbent polymer was obtained. Na-bentonite compact with absorbentpolymer ware investigated the good absorption and preservation when the Na-bentonite compact withabsorbent polymer 40 mass %
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.569.245.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Preparation of Si-B-C System Powder Using Silicon, Boron, and Boron Carbide (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 544-545 (May 2007), p. 933-936 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Boron carbide composites in Si-B-C System have been widely studied and applied inexcellent engineering materials. These materials are usually used at high temperature. Unfortunately,amorphous Si-B-C ceramics have been few reports regarding the properties of Si-B-B4C ceramics.In this study, the preparation of crystallized Si-B-C system compounds using Si, B, and B4Cpowders was investigated to determine their potentially for applications as high hardnesscomposites. The samples were prepared at 1673 K for 2 hours in Ar atmosphere. The sinteredbodies were cut into 5 х 5 х 10 mm blocks and polished with diamond disk for Vickers hardness.The samples were subjected to X-ray diffraction (XRD) analysis for phase evolution using a powderX-ray diffractometer. The fracture surfaces of the specimens were observed using a scanningelectron microscope (SEM) included an energy dispersive X-ray fluorescence spectrometer (EDX)system to estimate the microstructures
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.544-545.933.pdf
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