インジェクション法による単層, 複層, 混合層被覆粒子の合成

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  • Preparation of Single-, Double- and Mixed-Layer-Coated Composite Particles by Injection Method.

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Coated particles were prepared by the raw material injection method. Mica was used as the core particle, and Al(NO3)3, TiCl4, SnCl4 and ZrOCl2 were used as raw materials for coating layers. The simple injection method (SI: injection of one of these raw materials), two-stage injection method (TI: injection of raw material solution in the order of Al(NO3)3 and one of the other raw materials (SRM: SnCl4, TiCl4 or ZrOCl2)) and the mixed solution injection method (MI: injection of mixed solution of Al(NO3)3 and SRM) were applied, and the following results were obtained.<br>(1) It was possible to coat mica by the SI method when SnCl4, TiCl4, or Al(NO3)3 was used as the raw material. They were transformed into cassiterite, rutile or γ-Al2O3 by calcination at 700°C, respectively.<br>(2) It was not possible to confirm the formation of a coating layer on the product obtained using the SI method when ZrOCl2 was used as the raw material.<br>(3) The morphology of the coating layer surface was affected by the kind of raw materials used when coating was performed using the SI method, and the tendency was almost the same as those of the MI and TI methods.<br>(4) For the products obtained using the MI method, simultaneous precipitation of Al and Sn compounds was expected when Al(NO3)3 and SnCl4 mixed solution was used as the raw material solution. On the other hand, the Al compound seemed to precipitate earlier than the other salts when TiCl4 or ZrOCl2 was used as SRM.<br>(5) When Al(NO3)3 and TiCl4 were used as raw materials, the coating layer seemed to form a double-layer when they were prepared by the TI method, and a mixed composite layer when prepared by the MI method.

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