A novel corrosion mechanism of Ti(C, N) cermets in molten aluminum induced by high‐entropy alloy binders
Huaqing Yi, Mengtian Liang, Miao Song, Bingbing Yin, Fugang Qi, Hao‐Wei Ren, Xiaolong Xie, Yi Yang
Abstract
Abstract The durability performance in molten aluminum with high chemical activity is considered to be a crucial factor for the application of traditional ceramic‐matrix composites in the aluminum industry. Herein, novel Ti(C, N) cermet composites with excellent corrosion resistance, featuring distinct ratios of high‐entropy alloy binders, were meticulously synthesized by spark plasma sintering (SPS). The synergetic effect of porosity and binder on the corrosion resistance was detailed analyzed. The results show that 8 wt% binder provides an optimum balance of porosity, hardness, fracture toughness and corrosion resistance of the cermets. The appealing corrosion resistance is intimately associated with the formation of a continuous layer consisting of TiN/AlN, which is introduced through the decarburization of the Ti(C, N) cermets. Additionally, a corrosion mechanism is proposed to elucidate the formation of alternating morphologies within the reaction layers of the cermets. This work is beneficial for selecting structural materials for use in the aluminum industry.