Novel frictional heat‐assisted mechanochemical residual curing of epoxy nanocomposites by silicon nitride nanofiller

Abstract The final properties of the epoxy (EP) based composites are influenced by the hardener used and the curing conditions. This study explores a novel mechanism in which nano‐silicon nitride (SiN) integration within the epoxy matrix facilitates residual curing under cyclic abrasion conditions. The tribological tests revealed that including 0.5 wt% SiN into EP improves wear resistance by 192% and quickly enables the nanocomposite to achieve a steady COF. Friction energy models and a modified Archard equation were employed to assess the stability of the specimens when subjected to sliding. Raman spectroscopy of prior‐ and post‐worn surfaces confirmed that the nanofiller induces residual curing and minimizes the exposure of new surface layers during the wear test. Further analysis using FESEM with EDS and DSC supports these findings. The neat EP exhibited a tribochemical mechanism, resulting in significant oxide formation. In contrast, the 0.5 wt% EP/SiN composite showed superior oxidation resistance, attributed to an increased crosslinking density attained during sliding. The near‐to‐complete crosslinking is credited for the improved wear and oxidation resistance. The proposed mechanism introduces a promising avenue for research aimed at extending product lifespan when subjected to sliding‐induced wear during service. Highlights SiN activates friction induced residual curing of epoxy by a novel hotball mechanism. Fleishcher's friction energy model suggests enhanced thermal stability. Raman analysis indicated improved crosslinking density for epoxy due to nano SiN DSC thermograms prior to and post wear prove the residual curing process FESEM and EDAX confirmed the absence of oxide layer formation in nanocomposites.