Novel Fe3-4N@FCI particles with improved microwave absorption and antioxidation properties prepared by surface nitridation method

Abstract

Iron nitride @flaky carbonyl iron particles possessing improved antioxidation and microwave absorption properties were successfully prepared by surface nitridation method with urea as nitrogen source. The XRD result indicates generation of Fe3N and Fe4N on the surface of FCI, which is marked as Fe3-4N@FCI. The SEM image shows the core-shell structure of the Fe3-4N@FCI. The TG curves exhibit the obvious oxidation temperature rising up to 400 °C after surface nitridation. Moreover, the Fe3-4N@FCI/silicon resin composite has almost invariable electromagnetic parameters and reflection loss (RL) values after heat treatment at 250 °C for 30 h.