Ta_0.8Hf_0.2C-27 vol%SiC (99.0% in relative density) composite was toughened and strengthened via pressurelessly in-situ reactive sintering process. HfC and β-SiC particles were formed after reaction of HfSi₂ and carbon black at 1650 °C. Ta_0.8Hf_0.2C was obtained from solid solutioning of HfC and commercial TaC. The β-α phase transformation of SiC proceeded below 2200 °C. High aspect ratio, platelet-like α-SiC grains formed and interconnected as interlocking structures. Toughness and flexural strength values of 5.4 ± 1.2 MPa m^1/2 and 443 ± 22 MPa were measured respectively. The toughening mechanisms by highly directional growth of discontinuous α-SiC grains were crack branching, bridging and deflection behaviors.

Ta _0.8 Hf _0.2 C-27 vol％SiC（相对密度99.0％）复合材料通过无压原位反应烧结工艺得到了增韧和强化。HfSi ₂和炭黑在1650°C反应后形成HfC和β-SiC颗粒。通过将HfC和市售TaC固溶而获得Ta _0.8 Hf _0.2C。SiC的β-α相变在2200°C以下进行。高纵横比的片状α-SiC晶粒形成并互连为互锁结构。韧性和抗弯强度值为5.4±1.2 MPa m ^1/2分别测量了443±22 MPa和443±22 MPa。不连续α-SiC晶粒高定向生长的增韧机理为裂纹分支，桥接和挠曲行为。