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Download Advances in Sintering: Ceramic Transactions (Ceramic by E. A. Olevsky, Rajendra Bordia PDF

By E. A. Olevsky, Rajendra Bordia

This factor of the Ceramic Transactions compiles forty-one papers protecting a wealthy range of the sintering technology and know-how issues. those papers have been provided on the overseas convention on Sintering, November 16-20, 2008 in los angeles Jolla, California.

The Ceramic Transactions series incorporates a choice of papers facing concerns in either conventional ceramics (i.e., glass, whitewares, refractories, and porcelain tooth) and complicated ceramics. subject matters lined within the sector of complex ceramic comprise bioceramics, nanomaterials, composites, good oxide gasoline cells, mechanical houses and structural layout, complex ceramic coatings, ceramic armor, porous ceramics, and extra.

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Extra info for Advances in Sintering: Ceramic Transactions (Ceramic Transactions Series, Volume 209)

Example text

At 230 °C the absorption and desorption plateaus are 21 and 10 bar, respectively. In order to compare the sorption kinetics using different catalysts we carried out experiments at 230 °C/43 bar. Figure 2 shows absorption kinetic curves at 230 °C and 43 bar of hydrogen pressure for Na,LiAlH„ without and with the both catalysts. % hydrogen was absorbed after 60 minutes. e. % is absorbed in 60 minutes. The reduction of the capacity can be explained due the formation of NaCl after milling. Absorption rates using the 20 and 80 % of the maximum capacity absorbed at 230°C/43 bar are shown in Table 1.

Although there are more than one dissociation step of alkali alanates and irreversibility, these new class of materials are considered because of their low absorption temperature as well as high hydrogen content. One of the pioneers of the synthesis of different alanates using chemical methods 13 Hydrogen Sorption Properties of Ti-Oxide/Chloride Catalyzed Na2LiAIH6 was Bogdanovic and co-workers''. However, chemical methods requires high hydrogen pressures and relative high temperatures, for example Na2LiAlH6 has been prepared from NaH+LiAlH4 in toluene under 300 bar H, at 433 K or by the reaction of NaAlH4+LiH+NaH in heptane under hydrogen pressure.

For UF* samples, the temperature gradient induced by the dilatometer is applied only in the initial stage of sintering (between 20°C and 980°C). Beyond 980°C, the heating rate is 5°C/min (minimization of thermal gradient). The dilatometric curve is reported in figure 6-(a). 7% TD. 46 · Advances in Sintering Science and Technology Modification of Mass Transport during Sintering Induced by Thermal Gradient For comparison, the figure 6 also presents the dilatometric behaviour of UF* alumina sintered until 1450°C at two heating rate : 5°C/min (figure 6-(b)) and 20°C/min (figure 6-(c)).

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