About this Abstract |
Meeting |
MS&T21: Materials Science & Technology
|
Symposium
|
13th Symposium on Green and Sustainable Technologies for Materials Manufacturing and Processing
|
Presentation Title |
Gelation-freezing Derived Mullite Thermal Insulators Prepared by Reaction Sintering with Various Types of Alumina Nanofibers and Silica |
Author(s) |
Manabu Fukushima |
On-Site Speaker (Planned) |
Manabu Fukushima |
Abstract Scope |
Thermal conductivity and strength of porous mullite prepared by freezing gels containing nano-sized powders. Mullite thermal insulators were fabricated by freezing gelatin gels containing nano-sized powders, drying under vacuum. followed by sintering. Various types of alumina nano-powders mixed with fumed silica or kaolin resulted in controlled strength and thermal conductivity, depending on the solid loading in the initial gel. The relationship between the microstructure, mechanical and thermal properties of the resulting ceramics was discussed using a multiscale modeling technique, in which a homogenization method was conducted with microscopic models created from three dimensional images, global stress distributions in macroscopic samples by finite element method and local stress distributions. The simulation results were consistent relatively with the experimental results. The overall morphology and properties of the insulators prepared by gelation–freezing route were investigated. |