不同稀土掺杂α-sialon陶瓷的透光性  

Optical Properties of α-sialon Doped with Different Earth Elements

作　　者：苏新禄[1] 王佩玲[1] 陈卫武[1] 程一兵[2] 

机构地区：[1]中国科学院上海硅酸盐研究所高性能陶瓷和超微结构国家重点实验室,上海200050 [2]澳大利亚Monash大学应用物理及材料工程学院

出　　处：《无机材料学报》2004年第4期738-742,共5页Journal of Inorganic Materials

基　　金：基金委两基地项目(50140120423);科学院海外杰出学者项目(2001-1-12)

摘　　要：利用放电等离子烧结(SPS)及1700℃高温热处理7和17h,研究了组份为R0.33Si9.3Al2.7O1.7N14.3(R=Gd,Y和Er)的α-sialon在4000-1500cm-1(2.5-6.6μm)范围的光学透过率。结果表明,经SPS烧结的样品不但达到致密化,且样品中α-sialon晶粒的尺寸分布均匀。在SPS样品中,以Y2O3掺杂α-sialon的透光性最好。样品厚度为0.5mm时最高透过率达到56％.热处理7h由于第二相的形成导致透过率下降,但合适的热处理条件能提高样品的透过率,例如Gd117的红外最高透过率从SPS后的47%提高到561%.By spark plasma sintering (SPS) and post-sintering heat treatments at 1700°C for 7 h and 17 h respectively, the optical transmission of R0.33Si9.3 Al2.7O1.7N14.3 (R=Gd, Y and Er) in 4000-1500 cm-1 (2.5-6.6 μm) was studied. The results indicate that fully densified specimens obtained by SPS are with homogenous distributed α′ grains. Among three SPS-ed specimens, Y α-sialon ceramic has the highest transmittance and it reaches 56% for the specimen with 0.5 mm in thickness. The heat treatment for 7 h causes the decrease in optical transmittance due to the formation of the second crystallized phase in the specimens. The optical transmittance of specimens can be improved by suitable heat treatment, and the maximum optical transmittance value of Gdll7 can be increased from 47% as SPS-ed to 56% after heat-treated at 1700°C for 17 h.

关 键 词：Α-SIALON 多晶陶瓷 透光性 

分 类 号：TQ174[化学工程—陶瓷工业]