Ceramic matrix composites with unimodal pore size distribution and low fiber volume fraction

摘要

Ceramic matrix composite articles (10) include, for example, a plurality of unidirectional arrays of fiber tows (20) in a matrix having a monomodal pore size distribution, and a fiber volume fraction between 15 percent and 35 percent. The articles may be formed by a method (100), for example, by providing (110) a shaped preform comprising a prepreg tape layup of unidirectional arrays of fiber tows (20), a matrix precursor, and a pore former, curing (120) the shaped preform to pyrolyze the matrix precursor and burnout the pore former so that the shaped preform comprises the unidirectional arrays of fiber tows (20) and a porous matrix having a monomodal pore size distribution, and subjecting (130) the cured shaped preform to chemical vapor infiltration to densify the porous matrix so that the ceramic matrix composite article (10) has a fiber volume fraction between 15 percent and 35 percent.