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Fabrication technologies for oxide–oxide ceramic matrix composites based on electrophoretic deposition

2005; Elsevier BV; Volume: 26; Issue: 9 Linguagem: Inglês

10.1016/j.jeurceramsoc.2005.03.251

1873-619X

E. Stoll, P. Mahr, Hendrik G. Kruger, H. Kern, Brent Thomas, Aldo R. Boccaccını,

TiO2 Photocatalysis and Solar Cells

Electrophoretic deposition (EPD) was used to fabricate alumina matrix composites with high volume fraction of woven fibre mat (Nextel™ 720) reinforcement in a multilayer structure. Colloidal suspensions of Al2O3 nanoparticles in ethanol medium with addition of 4-hydrobezoic acid were used for EPD. Two different techniques were developed for fabrication of Al2O3 matrix/Nextel™ 720 fibre composites. The first method is a combination of standard EPD of single fibre mats with a subsequent lamination procedure to fabricate the multilayered composite. The second method involves the simultaneous infiltration of several (three or more) Nextel™ 720 fibre mats by EPD in a tailor-made cell. The composites exhibit a homogeneous matrix microstructure, characterised by a very high particle packing density and relatively low porosity after sintering at 1300 °C. The EPD cell allows production of relatively large bodies (10 cm diameter). By combination of the multilayer EPD infiltration and lamination processes developed here, thick ceramic matrix composite components (>10 mm thickness) can be fabricated, which opens the possibility of greater industrial application of the materials.