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Effect of mixing state of raw materials in the preparation of Mg2B2O5 whiskers

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We have studied various ways of preparing acicular magnesium pyroborate (Mg2B2O5). We formed acicular Mg2B2O5 from the reaction of an MgO-H3BO3-KCl mixture (2:3:5 mole ratio) at 850°C. The product, however, contained agglomerates derived from large MgO particles. In a variation, finely mixed raw material was prepared by the spray drying of slurry. The slurry was made by dissolving MgCl2, H3BO3 and KCl in hot water and neutralizing it with KOH. The reaction was again driven at 850°C. The product was acicular Mg2B2O5 without agglomerate, but the crystal length did not exceed 10 μm. Finally, M92B2O5, crystals 20-40 μm long and 1-3 μm thick were obtained by seeding the slurry with small Mg2B2O5 crystals.

Affiliations: 1: Government Industrial Research Institute, Shikoku, 2-3-3 Hananomiya-cho, Takamatsu 761, Japan; 2: Otsuka Chemicals Co., Ltd, 463 Kagasuno Kawauchi-cho, Tokushima 771-01, Japan


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