Multilayered Fiber-Reinforced Oxide Composites Produced by Lamination of Thermoplastic Prepregs

Abstract

For advanced ceramic composites, affordable manufacturing is still the most essential shortcoming with respect to successful commercial use. This holds particularly for components made out of composites with complex hierarchical structures and high demands of mechanical performance and reliability at the same time, e.g. fiber-reinforced ceramic matrix composites (FRCMCs). Therefore, a new processing route is presented here, which is based on the lamination of thermoplastic prepregs. This route allows not only affordable manufacturing, but also advanced mechanical reliability. Powder metallurgy techniques are combined here with concepts from the prepreg technology in a route consisting of the following steps (a) manufacturing of 2 D prepregs using commercial fiber fabrics which are infiltrated with compounds of ceramic particles embedded in an organic matrix, (b) followed by respective stacking and joining, (c) burn out of the organic matrix and (d) sintering to consolidate the matrix. Composites consisting of a porous Al2O3/ZrO2 matrix, reinforced by 8 layers of NextelTM 610 fiber fabric exhibit a bending strength of ~440 MPa, with graceful failure behavior, e.g. a stepwise stress reduction after peak nominal stress. The fracture of these composites is controlled by a series of interfacial delamination events, which enhance energy dissipation during failure.

Archives of Metallurgy and Materials

“…davis in his work describes chemical and physical properties of al 2 o 3 , as well as its manufacturing process and its applications or uses [13]. guglielmi et al establish a methodology to produce full-scale, all-oxide composites with porous reaction-bonded aluminum oxide (rBao) with good physical properties [14]. despite the large number of studies carried out to process alumina and improve its physical properties through incorporating different reinforcements, the combination of reaction Bonded aluminum oxide (rBao) and spark plasma sintering (sps) processes for obtaining alumina has not been reported.…”