A novel silica aerogeliporous Y2SiO5 ceramics with low thermal conductivity and enhanced mechanical properties prepared by freeze casting and impregnation

作者：Zhang, Rubing^*; Qu, Qiang; Han, Bingyu; Wang, Baolin

来源：Materials Letters, 2016, 175: 219-222.

DOI：10.1016/j.matlet.2016.04.051

• Porous materials
• Freeze casting
• Ultra-high porosity
• Thermal properties

A novel silica aerogel/porous Y2SiO5 composite was prepared by freeze casting and sol-gel impregnation. Porous Y2SiO5 ceramics with different solids contents were prepared at 1400 degrees C. The pore structure, porosity and mechanical properties of the porous Y2SiO5 ceramics before and after impregnating of silica aerogel were investigated. The results show that the room-temperature thermal conductivity decreases and the compressive strength increases remarkably while impregnating porous Y2SiO5 with silica aerogel. The silica aerogel/porous Y2SiO5 composite exhibits a high compressive strength (i.e. 9.3 MPa) and a low thermal conductivity (i.e. 0.260 W/(mK)). This work reports an optimal processing method of silica aerogel/porous Y2SiO5 composite with the potential application as a high-temperature thermal insulation material.

• 出版日期2016-7-15
• 单位北京交通大学