Sinterability of magnesium-oxide powder containing spherical agglomerates |
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Authors: | T Murata F S Howell K Itatani |
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Affiliation: | (1) Department of Chemistry, Faculty of Science and Engineering, Sophia University, 7-1 Kioi-cho, Chiyoda-ku, Tokyo, 102-8554, Japan |
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Abstract: | The magnesium-oxide (MgO) powders were prepared by calcining basic magnesium carbonate (4MgCO3·Mg(OH)2·4H2O; BMC) powder at a temperature between 600°C and 1200°C for 1 to 5 h. The resulting MgO powders contained spherical agglomerates with diameters of 10–50 m; the external shapes of these BMC agglomerates remained unchanged even after the calcination. With increasing compaction pressure, the densification of MgO powder compacts proceeded by (i) the rearrangement of agglomerates ( 50 MPa), (ii) the collapse of agglomerates (50–100 MPa), and (iii) the closer packing of primary particles ( 100 MPa). The MgO compact was fired at 1400 °C for 5 h. The relative density of the sintered MgO compact whose starting powder was prepared by calcining the BMC at 1000°C for 3 h attained 98.0%. The bending strength of this sintered MgO compact attained 214 MPa. |
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