“…One of the ways to improve the TSR is the use of coarse-grained alumina [1][2][3]. The TSR of Al 2 O 3 ceramics can be improved by modelling various composites, for example, modifying Al 2 O 3 with MgO [4] or nano-sized ZrO 2 [5]. It has been reported that needle-like mullite crystals [6] or incorporation of aluminium nitride [7], tungsten carbide [8], titanium carbide [9], or metallic (e.g., iron [10], copper [11], or molybdenum [12]) particles improve the TSR of dense Al 2 O 3 .…”