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    • 3. 发明授权
    • Process and apparatus for coating particles with fine powder
    • 用细粉末涂覆颗粒的方法和设备
    • US4788080A
    • 1988-11-29
    • US42715
    • 1987-04-27
    • Junichi HojoSerge DallaireBlaise Champagne
    • Junichi HojoSerge DallaireBlaise Champagne
    • B01J2/00B05D1/00B05D7/00B22F1/02C04B41/45C04B41/81B05D7/24
    • C04B41/009B01J2/006B05D1/00B05D7/00B22F1/02C04B41/4584C04B41/81B05D2258/00
    • There is disclosed a process for coating particles, such as ceramic, metallic and organic cores, with fine powder, such as ceramic, metal, organic or carbon powder. The process comprises providing a mixture comprising the particles and a binder which is capable of slowly melting to viscous state. Then the mixture is tumbled while slowly heating it to enable the binder to reach the viscous state while allowing the particles to be substantially covered with the binder. The next step includes cooling the mixture to about room temperature and thereafter breaking up the particles that may have agglomerated during the tumbling and heating to give individual particles covered with the binder. As a final step, the fine powder is added to the individual binder covered particles and the mixture is tumbled and heated again to the viscous state under conditions effective to provide a coating of the fine powder on the particles. Additional heating may be carried out to remove the binder and leave particles exclusively coated with the fine powder. The apparatus includes a rotating cylinder, heating and cooling means. The resulting product has a more uniform microstructure and higher bonding strength than a product resulting from a conventional mixing of ingredients.
    • 公开了用微细粉末如陶瓷,金属,有机或碳粉末涂覆诸如陶瓷,金属和有机芯的颗粒的方法。 该方法包括提供包含颗粒的混合物和能够缓慢熔化成粘性状态的粘合剂。 然后混合物翻滚,同时缓慢加热,使粘合剂达到粘性状态,同时允许颗粒基本上被粘合剂覆盖。 下一步骤包括将混合物冷却至约室温,然后分解在翻滚和加热期间可能发生团聚的颗粒,从而得到用粘合剂覆盖的单个颗粒。 作为最终步骤,将细粉末加入到单个粘合剂覆盖的颗粒中,并且在有效地在颗粒上提供细粉末涂层的条件下,将混合物翻转并再次加热至粘性状态。 可以进行另外的加热以除去粘合剂并且留下仅涂覆有细粉末的颗粒。 该装置包括旋转圆筒,加热和冷却装置。 所得到的产品具有比由常规的成分混合产生的产品更均匀的微观结构和更高的粘结强度。