Fabrication of Nd:YAG transparent ceramics with TEOS, MgO and compound additives as sintering aids
Fabrication of Nd:YAG transparent ceramics with TEOS, MgO and compound additives as sintering aids
复制标题
DOI：
10.1016/j.jallcom.2010.04.151
复制
发表时间：
2010-07
影响因子：
6.2
通讯作者：
Yukun Li;Shengming Zhou;Hui Lin;Xiaorui Hou;Wenjie Li;Hao Teng;Tingting Jia
中科院分区：
文献类型：
--
作者：
Yukun Li;Shengming Zhou;Hui Lin;Xiaorui Hou;Wenjie Li;Hao Teng;Tingting Jia
1。以Al2O3、y2o3和nd2o3为原料，以TEOS、MgO和TEOS与MgO复合为添加剂，采用固相反应和真空烧结法制备了% Nd:YAG透明陶瓷。当TEOS和MgO分别作为助烧剂时，最佳用量分别为0.5 wt%和0.2wt%。但过量的TEOS或MgO容易在晶界和孔隙中产生残余的第二相。掺0.4wt% TEOS和0.08wt% MgO的Nd:YAG陶瓷在1064nm处的最大透光率达到最高，在最高透明度的样品中获得了几乎无孔的微观结构，平均晶粒尺寸大于30μm。所有样品在1700℃烧结至接近满密度（>99.8%），0.4wt% TEOS和0.08wt% MgO的样品致密率最高。使用复合添加剂的优点是在真空烧结中使强化液相烧结在较低的温度下开始，提高了致密化速度，获得了无污染的晶粒。
1at.% Nd:YAG transparent ceramics were fabricated by solid-state reaction and vacuum sintering method using commercial Al2O3, Y2O3and Nd2O3as raw materials, TEOS, MgO and TEOS combined with MgO were used as additives. When using TEOS or MgO as sintering aids separately, the optimum dosage is 0.5 and 0.2wt%, respectively. But residual second phases in the grain boundaries and pores are easily generated by adding excessive TEOS or MgO. The maximum transmittance at 1064nm of the sintered Nd:YAG ceramics is doped 0.4wt% TEOS combined with 0.08wt% MgO, nearly pore-free microstructure with the average grain size of more than 30μm was obtained in this highest transparent sample. All samples sinter to near full density (>99.8%) at 1700°C and the sample with 0.4wt% TEOS combined with 0.08wt% MgO has the highest densification rate. The excellent feature of using compound additives is to make the intensified liquid sintering start at a lower temperature in vacuum sintering, promoting the densification rate and obtaining the uncontaminated crystalline grains.