Fabrication of Ceramic Matrix Composite Blisks from Near-Net Shape Preforms
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AbstractNo timely and cost-effective methods now exist for the fabrication of continuous fiber-reinforced ceramic matrix composites (CMCs) of complex geometries. Application of such CMCs can potentially enhance the efficiency and performance, reduce the weight,improve the durability, and lower the cost of aerospace propulsion systems, particularly those used in high temperature, high-stress environments. Achieving these benefits requires development of fiber preform production and matrix infiltration techniquescapable of efficiently producing net or near-net shape parts to eliminate the need for costly and time-consuming machining in the final production step. The quality of such parts will also depend on implementation of improved fiber/matrix interfaces andinterface deposition techniques. For many projected applications, carbon fibers are of particular interest as CMC reinforcements because they are relatively inexpensive, have higher strength and stiffness and lower density than oxide or non-oxide ceramicfibers, and retain their mechanical properties at very high temperatures. The main drawback of carbon fibers, however, is their low oxidation resistance, which has prevented their extensive use in high temperature oxidizing environments. Oxide interfacescan potentially impart sufficient protection, as well as provide other essential interface functions. In previous work, Ultramet demonstrated a unique and innovative process for depositing oxide interfaces, specifically ultraviolet-enhanced chemical vapordeposition (UVCVD). Ultramet has also successfully achieved rapid infiltration of carbide matrices within thin (<0.125
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