Topological interlocking and damage mechanisms in periodic Ti2AlC-Al building block composites. Issue 6 (June 2019)

• Record Type: Journal Article
• Authors: Stumpf, Martin; Fan, Xiaomeng; Biggemann, Jonas; Greil, Peter; Fey, Tobias
• Is Part Of: Journal of the European Ceramic Society. Volume 39:Issue 6(2019)
• Page Start: 2003
• Page End: 2009
• Publication Date: 2019-06
• Subjects: Topological toughening -- Building blocks -- Brick-and-mortar composites -- MAX-Phase -- Scaffold; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2019.01.047
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: Ceramic Ti2 AlC building blocks of 4 × 1.24 × 1.24 mm³ size were prepared by injection molding and assembled to brick-and-mortar structures with tetragonal, monoclinic and triclinic unit cells. The single building blocks were bonded with an Al-loaded polysiloxane adhesive, which was afterwards pyrolized. Afterwards the 3D-assemblies were infiltrated with an Al-melt to fabricate dense 0–3 ceramic-metal composites. The influence of the unit cell of the resulting Ti2 AlC-Al composites was investigated regarding the mechanical properties and damage mechanisms in bending tests. The developed near-net shape fabrication process shows great potential to manufacture structured ceramic-metal composites with high toughness and complex shape. Due to their ductile behavior scaffold applications are possible. The calculated initial fracture toughness of monolithic Ti2 AlC could be improved from 5.0 MPa m 0.5 to 14.5 MPa m 0.5 for the monoclinic assembly and 14.7 MPa m 0.5 for the triclinic assembly, corresponding to an increase of 191%.