Preparation of Alumina Fiber Reinforced Alumina Ceramic Matrix Composite by Prepreg Process

The reinforcement and matrix of the oxide/oxide ceramic matrix composite material are both made of oxide, and there is no oxidation problem, It is an ideal material for long-life and high-reliability components. It can be used for a long time in the high temperature environment, ranging 1000-1300 degrees C. In this study, referring to the unidirectional fiber wet prepreg preparation process of resin matrix composite, the unidirectional fiber wet prepreg was prepared by configuring alumina powder slurry on a winding wet prepreg machine, and then the prepreg was laid. Alumina fiber reinforced alumina ceramic matrix composite material was obtained by layer molding and high temperature heat treatment, and the properties of the composite material were characterized at the same time. The results show that when the solid content of the alumina powder slurry is 50% (volume fraction, the same below), the ratio of water to glycerol in the slurry solvent is 3:1, the wire speed of fiber is 6 m/min, and the parallel progress of the drum is 0.5 mm, the prepreg with no gaps, no fiber overlap, and with smooth surface can be obtained. The tensile strength of the composite material prepared by hot pressing of the prepreg layer is as high as 208.2 MPa, and the bending strength is 386.7 MPa. Compared with the slurry coating process of two-dimensional fiber cloth, the mechanical properties are greatly improved, and the prepreg process has the advantages of easy storage, simple operation, and suitability for industrial production.