Formation of Polytypoids (12H and 21R) in High Temperature Nitrogen Atmosphere and Their Effects on SiC-MgAl <sub>2</sub>O <sub>4</sub> Composites

GU Chenwei, WANG Zhanmin, ZHAO Shixian, SI Yaochen, XIA Miao

China's Refractories . 2023, (2): 45 -50 . DOI: 10.19691/j.cnki.1004-4493.2023.02.009