分别研究了在 O 2气氛或 H 2气氛下煅烧预处理,对 Y2 O 3粉体性能的影响。用 BET、XRD、SEM和 TMA 对粉体形貌和特性进行了分析。结果表明,煅烧气氛不仅会影响粉体颗粒尺寸,也同时会影响到粉体的团聚状态；O 2煅烧后粉体为纯立方相 Y2 O 3,粉体颗粒近似球形,具有较小的粒径、较好的分散性,等升温速率烧结时具有较低的最大收缩速率温度；H 2气氛下在大于1050℃对粉体煅烧,不仅粉体颗粒尺寸显著长大,同时粉体颗粒也会发生严重的团聚。在 O 2气氛下1100℃煅烧的粉体颗粒尺寸约80 nm,同时团聚系数也最小,更有利于获得易烧结的 Y2 O 3粉体。
The effects of the calcination atmosphere on the property of Yttria nanopowders were investigated. The yttria powder were calcinated in O 2 and H 2 atmospheres respectively at various temperatures,and the prop-erties of the powders were characterized by using BET,XRD,SEM and TMA measurements.The results show that powders calcinated in O 2 atmosphere are of cubic phase,and are composed of near spherical particles with smaller particle size and good dispersity.Besides,the powders show lower temperature of maximum shrinkage rate under CRH sintering.On the other hand,the powders calcinated in H 2 atmosphere contain a trace amount of hexagonal structure YO 1 .45 8 .The particles are severely aggregated when calcinated at temperatures greater than 1 050 ℃,due to the occurrence of sintering between particles.Present investigation indicated that calcina-tion in O 2 is preferable to the preparation of sinterable Y2 O 3 powders.
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