High temperature deformation behaviour of crystallized Si-B-C-N ceramics obtained from a boron modified poly(vinyl)silazane polymeric precursor

Compression creep experiments were carried out on nano-crystalline precursor derived Si-B-C-N ceramics in atmospheric ambience at loads varying from 5 to 100 MPa and in the temperature range 1350-1500 deg. C to investigate the high temperature deformation behaviour and understand the mechanisms of deformation. The activation energy in the temperature range of 1350-1500 deg. C was determined to be 98 ± 12 kJ/mol and the stress exponent was found to be 1.1