Efficient Low-Cost Interface Coatings for Three-Dimensional (3-D) Reinforced Ceramic Matrix Composites (CMCs)

Period of Performance: 12/06/2006 - 07/31/2009

$353K

Phase 2 SBIR

Recipient Firm

Synterials, Inc.
318 Victory Drive
Herndon, VA 20170
Principal Investigator

Abstract

Ceramic matrix composites (CMCs) have shown promise for use in hot exhaust structures for turbines in high performance aircraft. However a life limiting failure mode for two types of CMCs with CG Nicalon reinforcement is a tendency to de-laminate during repetitive thermal and mechanical cycling. This behavior is related to low shear strength of the matrix, as there is no cross ply reinforcement in the 2D fiber architecture. The program is aimed at solving a major processing problem that is required to produce 3D architecture composites. The application of low oxygen containing BN-based interface coatings is required to be applied uniformly though out the woven preform. The Phase I effort addressed coating woven 3-D preforms, while the Phase II program will address weaving coated fiber tow in order to weave coated performs.