Assembly of Ceramics/Ceramic Matrix Composite (CMC) Components

In this Phase II effort MRi and its partners are teaming with GE, Boeing and Goodrich develop exotherm assisted bonding (EAB) technology as a cost effective method to join and attach ceramic composites to metals for application in the fabrication of CMC aircraft engine and missile components. This Phase II program is a technology demonstration effort aimed at developing MRi’s innovation which is based on the use of specially prepared nano-phase exothermic particulate materials in combination with polycarbosilane (PCS) to produce composite joints that bond SiC:SiC to metallic structures. The Phase II program will continue to investigate the use of a range of exotherm assisted bonding (EAB) materials, teamed with Ohio Aerospace Institute (OAI) and Exotherm Corporation. Phase II investigations will develop high energy density, refractory nano-phase exothermic fillers and conduct experiments that join melt infiltrated SiC:SiC to Waspalloy and IN718. Nano-phase exothermic filler mixtures will be prepared and used to join flat overlap SiC:SiC and superalloy joints that are representative in size and geometry to those in actual components. Joints will be tested from R.T up to 2,000ºF and selected samples will be subjected to mechanical testing and thermal burner rig testing at NASA-Glenn Research Center.