本研究之主旨在開發快速製備Nd：YAG多晶陶瓷製程，分別使用溶熱法與共沉法合成之Nd：YAG粉末樣品，以單軸加壓成形與初步燒結進行粉末性質比較，探討粉末粒徑與凝聚性對於胚體成形之影響。再將適當粉末以注漿成形法製備生胚樣品，並於漿料製備過程中改變震盪分散時間、分散劑添加量以及漿料固含量等參數，探討其漿料與生胚性質之影響。研究結果顯示，溶熱法合成之粉末具有良好的分散性質，不需冗長的球磨處理，即使是高濃度的漿料，僅以細胞粉碎機之震盪方式即可達到理想的分散狀態，大幅減少漿料製備過程所需的時間，提升整體製程的效率。在固含量參數為50 - 60 wt.%，分散劑添加量為2 wt.%的條件下震盪360秒，即可得到流動性佳且分散良好之漿料，經注漿後生胚密度皆約為60 %，最後以1800°C高溫燒結2小時可得到相對理論密度為99.5 %之高密度多晶陶瓷，其全光線穿透率可達70 %。

A fabrication of Nd:YAG transparent polycrystalline ceramics was reported in this work. Solvothermal derived Nd:YAG powders were used as starting material which were mono- dispersed and spherical single crystals. Highly concentrated slurry for the following slip casting forming was readily formed by a simply sonication treatment without the need of ball milling. To enhance the slurry stability, the parameters of slurry were also investigated. The optimal parameters of the slurry were 50-60 wt. % of solid loading, 2 wt. % of PAA-NH4 as dispersant and treated with an ultrasonic homogenizer for 360 seconds. The green body fabricated using slip casting method was about 60 %. A preheating treatment at 150°C for 1 h was applied to the green body in order to remove the residues. After a sintering at 1800°C for 2 h under N2 atmosphere, dense Nd:YAG polycrystalline ceramics with sintered density of 99.5 % was obtained. .The real in-line transmittance of ceramics was about 30 %.

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