• Scafè, Matteo
• Mingazzini, Claudio
• Nanni, Daniele
• Burresi, Emiliano
• Pilloni, Luciano
• Brentari, Alida
• Caretti, Daniele
• Burgio, Federica

Abstract

<jats:p>Polymer Impregnation Pyrolysis (PIP) is a cost effective technique for obtaining Ceramic Matrix Composites (CMC) modified with nanoparticles. Commercial UBE polymeric precursor (Tyranno polymer VL-100, diluted in xylene) of a SiC ceramic matrix (with 11 wt% O and 2 wt% Ti) was used to infiltrate 100x85x3 mm<jats:sup>Superscript text</jats:sup>3 SiC felts (Tyranno ZM fibers, diameter 14 microns, 800 filament/yarn, 270 g/m<jats:sup>Superscript text</jats:sup>2, with 9 wt% O and 1 wt% Zr), applying different pyrolysis procedures. In particular, pyrolysis was performed in two conditions: 1) at 1000 °C for 60 min; 2) at 900 °C for 120 min. A pyrolysis at 900 °C could be more convenient since it can be easily performed in a steel furnace, without a refractory lining. The SiC felts were pretreated by CVD (Chemical Vapour Deposition) in order to deposit a pyrolytic carbon interphase (about 0.1 microns). Impregnation was performed under vacuum, and drying was carried out in an explosion-proof heating oven. Pyrolysis at 900°C was performed in a AISI 310S austenitic steel furnace, under nitrogen flow. Geometric density was monitored during densification. Mechanical characterisation (bending tests at room temperature, following UNI EN 658-3:2002) was performed after 11 PIP cycles. The results were used to compare the influence of pyrolysis temperature on densification.</jats:p>

Topics

• nanoparticle
• density
• pyrolysis
• impedance spectroscopy
• polymer
• Carbon
• Nitrogen
• steel
• composite
• bending flexural test
• ceramic
• refractory
• chemical vapor deposition
• drying
• densification