Our website is currently undergoing maintenance. Article records and full texts remain available. Submissions can be made through the Editorial Manager.

Influence of Titanium Silicide Active Filler on the Microstructure Evolution of Borosiloxane-Derived Si-B-O-C ceramics

V. Vijay, S. Bhuvaneswari, V. M. Biju, R. Devasia

Journal of Ceramic Science and Technology, Vol. 7, No. 1 (2016), pp. 97-106

DOI: 10.4416/JCST2015-00040

Download full article (PDF)

Abstract

Interactions between a typical polyborosiloxane containing methyl and vinyl functionalities, (BoSiVi) and active filler (TiSi2) at 1500 °C under inert atmosphere were studied. The effects of filler content on the volume shrinkage, porosity, phase evolution and microstructure of the resulting ceramic were studied in detail. The optimum concentration of the active filler to fabricate Si-B-Ti-O-C ceramic with zero volume shrinkage was calculated. Pore size distribution uniformity in the resulting ceramic was increased with the incorporation of the filler into the polymer. XRD and Raman analyses confirm the evolution of TiC, TiOC, TiB2, and SiC ceramics with stacking faults by active-filler-controlled polyborosiloxane pyrolysis. SEM-EDX, FESEM and HR-TEM analyses reveal the growth of ceramic nanofibres on the ceramic matrix as the result of a novel solution-precipitation process. Polyborosiloxane/active filler reactions are found to have a highly significant influence on the volume shrinkage, porosity, phase evolution, etc. of the final ceramic, which are critical parameters of an advanced structural material.

Keywords

Polyborosiloxanes, active filler controlled polymer pyrolysis (AFCOP), catalyst-assisted pyrolysis, ceramic nanofiber, titanium disilicide

View this issue · Article & DOI index