(中南大學 粉末冶金國家重點實驗室，長沙 410083)
摘 要: 以0.675PMN-0.325PT反應原料為基體，<001>取向的片狀SrTiO3為模板，利用模板晶粒生長技術在較低的溫度下制備出具有一定取向度的0.675PMN-0.325PT多晶織構陶瓷。研究了燒結過程中基體晶粒自身長大和模板外延生長情況以及PbO添加量對織構組織形成的影響。結果表明：增加PbO含量可加快基體晶粒溶解−析出過程，促進基體晶粒的長大；同時液相含量的增加還有利于模板的外延生長以及織構組織的形成；與以PMNT為基體相比，以反應原料為基體可大幅度降低燒結溫度；添加3%過量PbO后，在1 000 ℃保溫2 h后即可獲得取向度為40%的PMN-PT多晶織構陶瓷。
關鍵字: PbO；0.675PMN-0.325PT；TGG法；多晶織構陶瓷
（State Key laboratory of Powder Metallurgy, Central South University, Changsha 410083, China）
Abstract:Textured 0.675PMN-0.325PT polycrystalline ceramics with certain orientation degree were prepared using mixed oxide powders 0.675PMN-0.325PT as matrix and <001> tabular SrTiO3 as templates at relative low temperatures by templated grain growth technique. The effects of self-growth of matrix grains during sintering process, epitaxial growth of templates and excess PbO on texture formation were also studied. The results show that the increase of excess PbO can accelerate the dissolution-precipitation process of the matrix, and then improve the matrix grains growth. Meanwhile, the increase of liquid content also can promote both epitaxial growth of template and formation of textures. The sintering temperatures when reactive material used as matrix are much lower than those when PMNT used as matrix. Holding at 1 000 ℃ for 2 h, the textured PMN-PT ceramic with orientation degree of 40% are obtained after adding 3% excess PbO.
Key words: PbO; textured 0.675PMN-0.325PT; TGG method; polycrystalline texture ceramic
