Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10624102 | Ceramics International | 2016 | 9 Pages |
Abstract
The emerging porous Y2SiO5 ceramic is regarded as a promising candidate of thermal insulator owing to its very low thermal conductivity. However, recent works on porous Y2SiO5 are confronted with severe problems such as large linear shrinkage (18.51-20.8%), low porosity (47.74-62%) and low strength (24.45-16.51 MPa) at high sintering temperatures (1450-1500 °C). In this work, highly porous Y2SiO5 ceramic with low shrinkage and excellent high-temperature strength was fabricated by in-situ foam-gelcasting method at 1550 °C. The as-prepared sample has unique multiple pore structures, low linear shrinkages of 6.3-4.5%, controllable high porosities of 60.7-88.4%, high compressive strengths of 38.2-0.90 MPa, and low thermal conductivities of 0.126-0.513 W/(m K) (porosity: 87.1-60.2%). The effects of relative density on relative strength, as well as porosity on thermal conductivity were quantitatively discussed. The present results indicate that porous Y2SiO5 is the potential high-temperature thermal insulation material of light weight, low thermal conductivity, and high strength.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Zhen Wu, Luchao Sun, Jingyang Wang,