Innovative 2D Ceramic Matrix Composites for Improved Interlaminar Strengths

The performance of the JSF can be improved through the use of CMCs because they offer lower weight, improved high temperature strengths, and better performance than existing metal components. Recent tests of CMC components have identified COI's S200 CMC as an attractive material for gas turbine applications. Flight tests of F-16 nozzle components have demonstrated better performance than metal parts. They have also shown that the life of the CMC is limited by the interlaminar strengths. The proposed effort seeks to improve these strengths by assessing three innovative techniques that include 1) an alternate matrix material, 2) stretch broken yarns, and 3) needled preforms. Each of these techniques shows promise based on examination of existing high temperature composite data, which suggest potential strength improvements ranging from two to five times nominal strengths. The proposed Phase I program will be performed by a team of MR&D, Intermat, TEAM, COI Ceramics, and SoRI. MR&D will design the materials, and manage the project. Intermat will stretch break the Nicalon yarns. TEAM will weave the stretch broken fabric and fabricate the needled preform. COI Ceramics will densify three CMCs made with a) alternate matrix materials, b) stretch broken yarns, and c) needled preforms. SoRI will measure the interlaminar shear and inplane tensile properties of each material.