Tailoring the Properties of Ceramic-Based Composites Using Co-Extrusion Processing

Greg Hilmas; Jeremy Watts

doi:10.4028/www.scientific.net/AST.45.1385

Paper Titles

Magneto-Photonic and Magnonic Crystals Based on Ferrite Films - New Types of Magnetic Functional Materials
p.1355

Hot Pressing of cBN Ceramics with Al Binder
p.1364

Preparation of Cu/GDC Cermet Anode by Sintering via Surface Modification with MgO Sol
p.1371

Microstructures and Interfaces in Melt-Growth Al₂O₃-Ln₂O₃ Based Eutectic Composites
p.1377

Tailoring the Properties of Ceramic-Based Composites Using Co-Extrusion Processing
p.1385

Ceramic Composites for Automotive Friction Devices
p.1394

Polyethylene-Clay Nanocomposites Using Ionomeric Compatibilizer
p.1399

Ceramic Matrix Composite with Increased Thermal Conductivity
p.1405

Spark Plasma Synthesis/Sintering of Dense Ceramic, Intermetallic and Composite Materials
p.1411

HomeAdvances in Science and TechnologyAdvances in Science and Technology Vol. 45Tailoring the Properties of Ceramic-Based...

Tailoring the Properties of Ceramic-Based Composites Using Co-Extrusion Processing

Abstract:

Co-extrusion processing is a powder-based forming method that uses the simultaneous ram extrusion of two or more materials to form multi-phase systems with functionally designed architectures. A functionally designed material has functional properties that are specifically tailored for an application by changing the macrostructure (100’s of microns) with little or no change in overall composition. Thus, co-extrusion can be used to improve the functional properties of composite materials, with or without a concurrent boost of its intrinsic properties. An example of a functionally designed material with a coaxially co-extruded architecture, known in the ceramic field as a “fibrous monolith”, has elongated cells of a major (70-90 vol.%) phase surrounded by cell boundaries of a minor (10-30 vol.%) phase. A variety of strong-phase/weaker-phase combinations have been demonstrated, including Si3N4/BN, SiC/graphite, SiC/BN. Several wear resistant-phase/ductilephase combinations have also been studied, including Diamond(Co)/WC(Co) for use in the petroleum drilling industry. The presentation will cover co-extrusion processing as a technology, applications that are being considered or are in production for most of the latter materials combinations, and a discussion of the functional properties that can be achieved using co-extrusion as a means to create functionally designed materials.