Ravi Kumar N V

Amorphous Si-B-C-N ceramics obtained from the polymer precursor (B[C 2H4-Si(CH3)NH]3) has been investigated for its high temperature mechanical properties by carrying out compression creep experiments. In order to understand and quantify the deformation behavior more precisely, free of any oxidation effects, the experiments were conducted in argon atmosphere. The results showed only primary creep for all stresses and temperatures tested during the entire creep test time which is typical for these classes of materials. The continuous decrease in creep rates is indicative of the continuous structural changes in these materials. However, there was no quantitative difference between the results obtained in an oxygen-free environment and in atmospheric ambience. It was observed that the shrinkage component of the total strain rate dominates over oxidation and controls the deformation behavior.