Using B₄C and C additives, a HfB₂–SiC composite with an enhanced strength up to 1600 °C was prepared using high-energy ball milling followed by hot pressing. The composite microstructure comprised equiaxed large HfB₂ and fine SiC grains and an intergranular amorphous phase. The mechanical behaviour of the composite was evaluated up to 1600 °C via a four-point bending test. At or below 1500 °C, only a linear stress–strain response was observed. At 1600 °C, however, the initial linear response was followed by nonlinear deformation behaviour. The flexural strength was constant between room temperature and 1400 °C; subsequently, the flexural strength significantly increased with increasing temperature up to 1600 °C, with strengths in the range of 650–750 MPa.

使用B ₄ C和C添加剂，通过高能球磨并随后进行热压，制备了强度提高到1600°C的HfB ₂ -SiC复合材料。复合材料的微结构包括等轴大的HfB ₂和细的SiC晶粒以及晶间的非晶相。通过四点弯曲试验评估了复合材料的机械性能，最高温度为1600°C。在或低于1500°C时，仅观察到线性应力-应变响应。但是，在1600°C时，初始线性响应之后是非线性变形行为。弯曲强度在室温至1400°C之间恒定；随后，随着温度升高至1600°C，抗弯强度显着增加，强度在650-750 MPa之间。