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首页> 外文期刊>CERAMICS INTERNATIONAL >Pelletisation by tumbling as an alternative method of agglomerating nanometric particles for use as feedstock in bi-modal structured flame-sprayed ceramic coatings
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Pelletisation by tumbling as an alternative method of agglomerating nanometric particles for use as feedstock in bi-modal structured flame-sprayed ceramic coatings

机译：作为替解纳米颗粒的替代方法，用作双模态结构的火焰喷涂陶瓷涂料中的含有纳米颗粒的替代方法

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摘要

This paper is focused on the physical evaluation of ceramic granules of Al2O3, Al2O3-13 wt% TiO2 (AT-13) and TiO2 obtained from alumina and titania nanoparticles by pelletisation in a rotating drum. The results were compared with those of both sintered and non-sintered granules of similar chemical compositions and particle size distributions which were spray dried, as well as with those of TiO2 pelletised granules blended with atomised alumina particles. The results obtained indicated that the physical characteristics of the pelletised granules conferred them a free-flowing behavior which was similar to that of the spray-dried granules. However, the TiO2 pelletised granules blended with harder atomised alumina particles disintegrated and, therefore, exhibited a poor flowability. Additionally, it was evident that the ceramic coatings fabricated from pelletised granules displayed a structure which was as or more compact than those of the granules obtained from agglomerated powders by spray drying with or without sintering, apart from being more compact than that of the coatings deposited from TiO2 pelletised granules blended with atomised alumina particles. The above findings indicate that the alternative pelletising method is potentially useful for the use of agglomerated nanoparticles as feedstock in the fabrication of bi-modal structured flame-sprayed ceramic coatings.
机译：本文集中于通过旋转滚筒在氧化铝和二氧化钛纳米粒子中获得的Al2O3，Al 2 O 3，Al2O3-13wt％TiO 2（AT-13）和TiO 2的陶瓷颗粒的物理评估。将结果与类似化学组合物的烧结和非烧结颗粒的颗粒的结果进行比较，颗粒尺寸分布在干燥的干燥，以及与雾化氧化铝颗粒混合的TiO2颗粒状颗粒的颗粒。得到的结果表明，颗粒化颗粒的物理特性赋予它们自由流动的行为，其类似于喷雾干燥的颗粒的行为。然而，与较硬的氧化铝颗粒混合的TiO2颗粒状颗粒崩解，因此流动性差。另外，显而易见的是，由颗粒化颗粒制造的陶瓷涂层显示出与通过喷射或不含烧结的凝聚粉末获得的颗粒的结构或更紧凑的结构，除了比沉积的涂层更紧凑从TiO2颗粒化颗粒与雾化氧化铝颗粒混合。上述发现表明，替代的颗粒化方法可能用于在制造双模态结构的火焰喷涂陶瓷涂层中使用附聚的纳米颗粒作为原料。

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