TY - JOUR
T1 - Pyrolysis of aluminium loaded polymethylsiloxanes
T2 - The influence of Al/PMS ratio on mullite formation
AU - Anggono, Juliana
AU - Derby, Brian
PY - 2010/1/1
Y1 - 2010/1/1
N2 - Al-filler-loaded polymethylsiloxane (PMS) was pyrolysed in air atmosphere at temperatures 400-1700 °C. The effect of the Al amount added to the PMS on phase development, densification behaviour and microstructure evolution was studied by simultaneous thermal analysis, X-ray diffraction, scanning electron microscopy and electron probe microanalysis. The Al/PMS reaction route is complex producing Si, SiO2 (amorphous and cristobalite), Al 2O3 (γ-, I- and α-Al2O 3), Al2OC, Al4O4C, Al 4SiC4, and AlN, depending on the ratio of Al/PMS in the initial mixture. Increasing the Al content (high Al/PMS ratio) reduces the amount of voids and porosities after PMS degradation. The voids and porosities provide access for the oxygen atmosphere into the inner structure to oxidise the Al particles, Si or SiC and also as channels for the PMS degradation products to escape. Mullite formation was identified in sample containing >73 wt% Al at temperature as low as 1400 °C.
AB - Al-filler-loaded polymethylsiloxane (PMS) was pyrolysed in air atmosphere at temperatures 400-1700 °C. The effect of the Al amount added to the PMS on phase development, densification behaviour and microstructure evolution was studied by simultaneous thermal analysis, X-ray diffraction, scanning electron microscopy and electron probe microanalysis. The Al/PMS reaction route is complex producing Si, SiO2 (amorphous and cristobalite), Al 2O3 (γ-, I- and α-Al2O 3), Al2OC, Al4O4C, Al 4SiC4, and AlN, depending on the ratio of Al/PMS in the initial mixture. Increasing the Al content (high Al/PMS ratio) reduces the amount of voids and porosities after PMS degradation. The voids and porosities provide access for the oxygen atmosphere into the inner structure to oxidise the Al particles, Si or SiC and also as channels for the PMS degradation products to escape. Mullite formation was identified in sample containing >73 wt% Al at temperature as low as 1400 °C.
KW - Simultaneous Thermal Analysis
KW - Silicone Resin
KW - Preceramic Polymer
KW - Siloxane Polymer
KW - Continuous Al2O3
UR - http://www.scopus.com/inward/record.url?scp=73049106967&partnerID=8YFLogxK
U2 - 10.1007/s10853-009-3925-6
DO - 10.1007/s10853-009-3925-6
M3 - Article
AN - SCOPUS:73049106967
SN - 0022-2461
VL - 45
SP - 233
EP - 241
JO - Journal of Materials Science
JF - Journal of Materials Science
IS - 1
ER -