Formation of Si3N4 coating on SiC substrate by gas transporting self‐propagating high‐temperature synthesis with the addition of NH4Cl. - Tian, Zhaobo; Du, Songmo; Cui, Wei; Zhang, Jie; Li, Fei; Chen, Zhanglin; Chen, Kexin; Liu, Guanghua (Journal of the American Ceramic Society, 2022)