Fabrication and properties of Al-infiltrated RBAO-based composites

✍ Scribed by Suxing Wu; Adam J. Gesing; Nahum A. Travitzky; Nils Claussen

• Publisher: Elsevier Science
• Year: 1991
• Tongue: English
• Weight: 849 KB
• Volume: 7
• Category: Article
• ISSN: 0955-2219
• DOI: 10.1016/0955-2219(91)90105-9

✦ Synopsis

The reaction-bonded AI20 3 (RBAO) process is applied to .[abricate open porosity AlzOs-based composites with SiC and A 12 0 3 particulate inclusions. These are then gas-pressure infiltrated with liquid aluminum. The Al-infiltrated composites exhibit strongly #nproved mechanical properties, e.g. fracture toughness and bond strength of samples containing 30 vol.% 13 #m diameter Al20 3 platelets are enhanced 1"6 to 5"8 MPax/m attd from 85 to 760 MPa, resT~ectiveO'. In all cases, crack bridging b), ductile Al ligaments is the main toughening mechanis'm. Filling o[ void d~/ects, caused by particulate agglomeration, with A1 is especiall), effective in reducing the strength-