Bulk, Dense, Nanocrystalline Yttrium Aluminum Garnet by Consolidation of Amorphous Powders at Low Temperatures and High Pressures
作者:Samrat Choudhury、Ashutosh S. Gandhi、Vikram Jayaram
DOI:10.1111/j.1151-2916.2003.tb00007.x
日期:2003.2
5\%\hspace2mm}Y_2O_3$ powders, prepared using spray pyrolysis followed by partial or complete thermal decomposition, were hot-pressed at $315^o–640^o\hspace2mm}C$ and 500 or 750 MPa uniaxial pressure. Hot pressing of fully decomposed amorphous powder at $450^o-640^o\hspace2mm}C$ at pressures up to 750 MPa led to densification (up to 96%) as well as nanocrystallization of yttrium aluminum garnet (YAG). When the
无定形 $Al_2O_3-37.5\%\hspace2mm}Y_2O_3$ 粉末,使用喷雾热解然后部分或完全热分解制备,在 $315^o–640^o\hspace2mm}C$ 和 500 或750 MPa 单轴压力。在高达 750 MPa 的压力下以 $450^o-640^o\hspace2mm}C$ 热压完全分解的无定形粉末,导致钇铝石榴石 (YAG) 的致密化(高达 96%)以及纳米化。当在加热过程中施加压力时,而不是在达到最终温度之后,会产生更高的相对密度。完全结晶的起始粉末没有致密。无定形相的低真密度 (3.1 g·$cm^-3}$) 被认为是通过增强的离子迁移率导致致密化的原因。