Coating of Alumina Fibres With Aluminium Phosphate by a Continuous Chemical Vapour Deposition Process2. Issue 10 (20th October 2014) - Stöckel, Sabine
Abstract: We developed aluminium phosphate‐coated alumina fibres with significantly improved pull‐out properties, which may be suitable for reinforcing advanced inorganic composites qualified for operating temperatures up to 1200 °C. Aluminium phosphate layers are generated on the surface of alumina fibres using a continuous chemical vapour deposition (CVD) process: At furnace temperatures between 850 °C and 1050 °C, within a tube reactor heated by an electrical furnace, the alumina fibres are exposed to gas mixtures of phosphoryl trichloride and oxygen, inducing dense aluminium phosphate layers on the fibre surface. Mini‐composites were prepared by embedding the coated fibres into an alumina matrix. Abstract : Aluminium phosphate layers are generated on the surface of alumina fibres by exposing them to gas mixtures of phosphoryl trichloride and oxygen. Ceramic‐matrix composites made by embedding these coated fibres into an alumina matrix show improved fibre pull‐out. Thus, the coated fibres may be promising as reinforcing fibres of advanced inorganic composites qualified for operating temperatures up to 1200 °C.