烧结助剂(Y^(3+)、La^(3+)和Mg^(2+))对半透明氧化铝陶瓷的透光率的影响（英文）

Effects of Sintering Aids (Y^(3+), La^(3+) and Mg^(2+)) on the Optical Transmittance of Translucent Alumina Ceramics

通过化学沉淀法引入烧结助剂Y^(3+)、La^(3+)和Mg^(2+),采用真空烧结工艺制备了半透明Al_2O_3陶瓷,并研究了烧结助剂对烧结材料的微观结构、相对密度和透光率的影响。结果表明:引入的烧结助剂能均匀分散在合成的半透明Al_2O_3陶瓷中。烧结助剂的最佳引入量为Mg^(2+)(0.15wt%)、Y^(3+)(0.05wt%)和La^(3+)(0.05wt%),对应的试样在350~800 nm的波长范围内显示出的最高的总透光率(TFT)高于80%。此外,Y^(3+)的掺杂可以促进晶粒生长,降低孔隙率,从而提高半透明Al_2O_3陶瓷的透光率。

Translucent Al2O3 ceramics were prepared by vacuum sintering using y3＋, La3＋ and Mg2＋ as sintering aids which were introduced via chemical precipitation. Effects of the sintering aids on microstructure, relative density and optical transmittance of the translucent Al2O3 ceramics were investigated. The results show that the sintering aids are homogeneously dispersed in translucent Al2O3 ceramics. The optimal amount of the sintering aid introduced is Mg2＋ （0.15wt%）, Y3＋ （0.05wt%） and La3＋ （0.05wt%）, and the corresponding sample shows the highest total forward transmittance （above 80% in the wavelength range of 350-800 nm）. Moreover, the addition of y3＋ could promote grain growth and decrease porosity, thus the oPtical transmittance of the translucent Al2O3 ceramics is enhanced.