1942. Ceramic Composites as a Lightweight Alternative for High Temperature Mechanical Fasteners

Paper

Abstract

A number of aerospace vehicles are emerging that will experience structural operating temperatures in excess of 1500′ F (815′ C) for extended periods of time. Historically, hot structure designs have been able to accommodate the high density, low strength, and poor oxidation resistance of state-of-the-art refractory metal and superalloy fasteners. The successful development of emerging aerospace vehicles will be dependent upon advances in lightweight, high temperature attachment technology. Due to their low density, intrinsic oxidation resistance, and thermal stability, ceramic materials are an attractive alternative for use in high temperature fastener applications but lack the desired toughness. Recently completed work at LTV has identified a number of ceramic composite materials with improved toughness which appear promising. This paper will discuss the rationale for the selection of specific ceramic matrix composites, producibility demonstrations and elevated temperature mechanical property data for selected compositions.