A New Fabrication Method for Continuous-Fiber CMCs and its Mechanical Properties

摘要

This paper presents a new fabrication technology of long fiber reinforced ceramic composites (CMCs) using pre-impregnated sheets. The monolayer prepreg sheets were successfully fabricated by a modified doctor blade method using a Si-Ti-C-O long fiber/Al_2O_3 laminated composite as an example. Continuous fiber CMC fabrication using prepreg sheets developed here does not require any expensive fabrication facilities and is concluded to be cost effective enough and have a good potential for significantly increasing static tensile properties, fracture toughness and fatigue resistance as well. The prepreg sheets of monolayer have a flexibility to allow handling during subsequent processing steps. This fabrication process has the advantage of being tailorable to a wide range of properties. For instance, the orientation angle and stacking sequence of sheets can be chosen arbitrarily to meet the actual requirements for strength, rigidity, coefficient of expansion, etc. in various directions. This fabrication concept can be applied to various fiber/matrix systems.