High Temperature Behaviours of Two Nanocomposite Oxide Fibres

摘要

The Nextel 720 alumina-mullite fibre and the Saphikon YAG-alumina fibre have been studied in tension and creep. Significant reductions in creep rates compared to other existing polycristalline oxide fibres have been noticed. This is related to the specific nanostructures of these two-phase fibres. Nextel 720 fibre was however seen to suffer from premature failure in creep due to the development of large alumina rich grains at the fibre surface.