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直接干压成型与真空烧结技术制备Nd:YAG透明陶瓷

作者:葛琳 李江 周智为 谢腾飞 潘裕柏 郭景坤 
单位:中国科学院上海硅酸盐研究所透明光功能无机材料重点实验室 上海200050 
关键词:钕掺杂钇铝石榴石陶瓷 干压成型 致密化行为 晶粒生长动力学 光学透过率 
分类号:TQ129
出版年,卷(期):页码:2015,43(9):0-0
DOI:
摘要:

 以高纯氧化物粉体为原料,采用直接干压成型与固相反应烧结技术制备Nd:YAG透明陶瓷,并对其光学透过率和烧结致密化行为进行了研究。结果表明,经1 760 烧结10 h后,250 MPa成型压强下的样品透过率最高,在1 064 nm处达到了83.8%。其素坯的气孔率为40.5%,气孔平均孔径74.5 nm。烧结后陶瓷的显微结构致密,晶界干净清晰,断裂方式为沿晶断裂。将该成型压强下获得的陶瓷素坯在不同温度和时间下烧结,得到致密化轨迹、晶粒生长曲线以及显微结构演变等信息。通过理论拟合,得出低温下陶瓷致密化和晶粒生长的控制机制为晶界扩散。

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 Nd:YAG transparent ceramics were fabricated by direct dry pressing and solid reactive sintering with high-purity oxide powders as starting materials. The optical transmittance and sintering behavior of Nd:YAG ceramics were investigated. The results show that the Nd:YAG ceramics sintered at 1 760 for 10 hours from the 250-MPa dry pressed green body reaches the maximum transmittance value of 83.8% at 1 064 nm. The porosity of this green body is 40.5%, and the average pore size diameter is 74.5 nm. The sintered Nd:YAG ceramics have a dense microstructure and a clear grain boundary with the mode of intergranular fracture. The green bodies dry-pressed at 250 MPa were sintered from 1 500 to 1 750 for 0.5–20.0 h to analyze their densification trajectories, grain growth and microstructure evolution. The control mechanism of the densification and grain growth at 1 550 is grain boundary diffusion.

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基金项目:
国家自然科学基金重大项目(50990301);国家自然科学基金青年基金项目(51302298)资助。国家自然科学基金重大项目(50990301);国家自然科学基金青年基金项目(51302298)资助。
作者简介:
第一作者:葛琳(1990-),女,硕士研究生。 通信作者:李江(1977-),男,博士,研究员。
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