Two different SiC ceramics with a new additive composition (1.87 wt% Y₂O₃–Sc₂O₃–MgO) were developed as matrix materials for fully ceramic microencapsulated fuels. The mechanical and thermal properties of the newly developed SiC ceramics with the new additive system were investigated. Powder mixtures prepared from the additives were sintered at 1850 °C under an applied pressure of 30 MPa for 2 h in an argon or nitrogen atmosphere. We observed that both samples could be sintered to ≥99.9% of the theoretical density. The SiC ceramic sintered in argon exhibited higher toughness and thermal conductivity and lower flexural strength than the sample sintered in nitrogen. The flexural strength, fracture toughness, Vickers hardness, and thermal conductivity values of the SiC ceramics sintered in nitrogen were 1077 ± 46 MPa, 4.3 ± 0.3 MPa·m^1/2, 25.4 ± 1.2 GPa, and 99 Wm⁻¹ K⁻¹ at room temperature, respectively.

两种具有新添加剂成分（1.87 wt％Y ₂ O ₃ –Sc ₂ O _3）的SiC陶瓷–MgO）被开发为完全陶瓷微胶囊燃料的基质材料。研究了具有新添加剂体系的新开发的SiC陶瓷的机械性能和热性能。由添加剂制备的粉末混合物在氩气或氮气气氛中于1850°C，施加的30 MPa压力下烧结2小时。我们观察到，两个样品都可以烧结到理论密度的≥99.9％。与在氮气中烧结的样品相比，在氩气中烧结的SiC陶瓷具有更高的韧性和热导率以及更低的抗弯强度。在氮气中烧结的SiC陶瓷的抗弯强度，断裂韧性，维氏硬度和热导率值为1077±46 MPa，4.3±0.3 MPa·m ^1/ 2，25.4±1.2 GPa和99 Wm ^-1室温下分别为 K ^-1。