摘要
Joining of ZrO_2 (containing 8% (mol fraction) Y_2O_3,as the composition used in oxygen sensors) to 95Al_2O_3 (widely used at elevated temperature) in green state was described using polymer/layered silicate (PLS) nanocomposites contained slurry,without applied pressure. Microstructure of the joined section was investigated. The effects of interlayer and PLS on joining qualities were analysed. The results show that interface cracks are easily produced because of mismatch of both thermal expansion and/or sintering shrinkage between joined samples. With an optimized condition of joining layer composition and solid contents,a fine joint could be obtained without obvious cracks,pores and other defects. This process is suitable for joining of various kinds of advanced ceramics.
Joining of ZrO_2 (containing 8% (mol fraction) Y_2O_3,as the composition used in oxygen sensors) to 95Al_2O_3 (widely used at elevated temperature) in green state was described using polymer/layered silicate (PLS) nanocomposites contained slurry,without applied pressure. Microstructure of the joined section was investigated. The effects of interlayer and PLS on joining qualities were analysed. The results show that interface cracks are easily produced because of mismatch of both thermal expansion and/or sintering shrinkage between joined samples. With an optimized condition of joining layer composition and solid contents,a fine joint could be obtained without obvious cracks,pores and other defects. This process is suitable for joining of various kinds of advanced ceramics.
