Optimization of the method of oxide coating of metallic iron powder particles Usan Berdiyev, Olga Demedenko, Mirjalol Ashurov, F.F. Hasanov and U.B. Sulaymonov E3S Web Conf., 383 (2023) 04039 Published online: 24 April 2023 DOI: 10.1051/e3sconf/202338304039