CAJ | 학술논문

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。
분별연구료재 O 2기분혹 H 2기분하단소예처리,대 Y2 O 3분체성능적영향。용 BET、XRD、SEM화 TMA 대분체형모화특성진행료분석。결과표명,단소기분불부회영향분체과립척촌,야동시회영향도분체적단취상태；O 2단소후분체위순립방상 Y2 O 3,분체과립근사구형,구유교소적립경、교호적분산성,등승온속솔소결시구유교저적최대수축속솔온도；H 2기분하재대우1050℃대분체단소,불부분체과립척촌현저장대,동시분체과립야회발생엄중적단취。재 O 2기분하1100℃단소적분체과립척촌약80 nm,동시단취계수야최소,경유리우획득역소결적 Y2 O 3분체。
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.