Emerging Materials and Nanotechnology

Biography

Biography: Jingyang Wang

Abstract

The critical challenge of current nanoscale oxide super thermal insulation materials, such as SiO₂ and Al₂O₃ nano-particle aggregates and their composites, is the critical trade-off between extremely low thermal conductivity and unsatisfied thermal stability (nanostability typically below 1100^oC). It is crucial important to modify current materials and further discover novel candidates which could balance the two key properties. This presentation shows progresses on optimal thermal stability of modified Al₂O₃ nano-paticle aggregate; and in addition, new candidates of super thermal insulation materials, such as nano-Si₃N₄ and nano-SiC, which are commonly believed as excellent heat conductors. Especially, the new nano-systems exhibited good nanostability up to 1500°C. The striking results incorporated superior sintering stability of structural ceramics as SiC and Si₃N₄ with multiple phonon scattering mechanisms in nano-materials. It is possible to put forward this novel concept to design and search new types of high temperature thermal insulation materials through nano-scale morphology engineering of structural ceramics with excellent thermal stability, regardless their high intrinsic lattice thermal conductivities.