Manufacturing of Damage Tolerant Fiber Reinforced Ceramic Composites with SiC and UHTC based Matrices via Reactive Melt Infiltration

Reference	Presenter	Authors (Institution)	Abstract
14-007	Dietmar Koch	Koch, D.(German Aerospace Center); Kütemeyer, M.(German Aerospace Center); Mainzer, B.(German Aerospace Center);	Reactive melt infiltration is a manufacturing process for fiber reinforced ceramics (CMC) which leads to a dense microstructure without extensive reinfiltration cycles. In a first step a dense preform consisting of Carbon fibers and a phenolic resin based matrix is manufactured and cured. After pyrolysis pore channels occur. In the final processing step liquid alloy enters the porous structure and reacts in an exothermic process with the matrix to a new high temperature stable phase. Depending on the chosen constituents either SiC-matrices or Boride based matrices are produced. The fibers should survive the process in order to provide damage tolerant behavior. Therefore the fibers must be protected against the reaction of the melt and additionally the fiber matrix interface must be adjusted in order to allow crack bridging effects like debonding and fiber pullout. This was realized by the application of multilayer fiber coatings. The manufacturing process is presented and the key issues are evaluated. The mechanical properties and the high temperature potential of the melt infiltrated composites are discussed. <!--[if gte mso 9]> << Back