Anelasticity of precursor derived Si–B–C–N ceramics

Partially crystalline precursor derived Si–B–C–N ceramics were investigated at elevated temperatures by compression creep experiments. Load change and constant load experiments at various temperatures in the range of 1300–1500 °C yield viscosity data as high as 1015–1016 Pa s and the values were determined assuming Newtonian flow. The anelastic behavior was analyzed with the help of Kohlrausch–Williams–Watts equation (KWW) and the fitting parameters are used to describe the relaxation behavior of this family of materials.