工艺参数对Nd∶YAG烧结致密化的影响
Effect of Processing Parameters on Sintering Densification of Nd:YAG
孟庆新1, 梁宝岩1, 李海云1, 苏春辉2,3
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作者单位：(1. 长春工业大学, 吉林 长春 130012; 2. 长春理工大学, 吉林 长春 130022; 3. 吉林工程技术师范学院, 吉林 长春130052)
中文关键字：Nd ∶Y3Al5O12；球磨； Y2O3原料； 烧结气氛； 真空烧结
英文关键字：Nd∶Y3Al5O12; ball milling; Y2O3 raw materials; sintering atmosphere; vacuum sintering
中文摘要：以高纯Y2O3、Al2O3和Nd2O3粉体为原料，少量纳米SiO2为烧结助剂，采用真空烧结方法制备致密的Nd ∶Y3Al5O12(Nd ∶ YAG)陶瓷， 并研究球磨处理原料粉体、 Y2O3原料颗粒度和烧结气氛对 Nd ∶ YAG烧结致密化的影响。 结果表明， 机械合金化氧化物混合粉体， 可明显细化氧化物颗粒，促进Nd ∶ YAG的烧结。在1600 ℃保温8 h，对球磨20 h的粉体压坯真空烧结得到的Nd ∶YAG块体相对密度达99%，晶粒大小约为10 μm；采用纳米Y2O3粉体作真空烧结原料， 可提高烧结活性， 获得细晶和高致密度的Nd ∶YAG陶瓷， 对混合粉体球磨20 h压坯烧结可得到晶粒大小为2 μm、相对密度为98.5%的Nd ∶YAG块体；在氩气保护下常压烧结，得到的Nd ∶YAG块体组织难以辨认，而且残留许多孔隙。
英文摘要：Neodymium doped Yttrium aluminum garnet (Nd ∶ YAG) ceramics were fabricated by vacuum sintering with Y2O3, Al2O3 and Nd2O3 powders as raw materials, using nano-meter SiO2 as sintering aid. The effects of ball milled powders, grain size of Y2O3 raw materials and sintering atmosphere on sintering densification of Nd ∶ YAG were investigated. The results show that the mechanical alloying of oxides mixed powders may obviously refine oxide particles and then enhance the process for sintering Nd ∶ YAG. At 1600℃ for 8 h, the relative density of the bulk sintered with the powders ball milling for 20 h is 99%, and it has a crystalline size of 10 μm; using nano-meter Y2O3 powders as raw materials, sintering reactivity enhances, so fine crystalline and high density of Nd ∶ YAG ceramic was obtained. The relative density of this bulk sintered with powders ball milling for 20 h is 98.5%, and it has a crystalline size of 2 μm. Sintering in Ar atmosphere, microstructure of Nd ∶ YAG bulk is difficult to discern and remains many pores.