巴基管/纳米SiC陶瓷材料的研究

本文研究了巴基管／纳米ＳｉＣ陶瓷材料。初步讨论了在热压条件下，巴基管、烧结温度和添加剂对其机械性能的影响。结果表明，添加了巴基管后，纳米ＳｉＣ的抗弯强度（室温）和断裂韧性有所提高。优化的工艺方案是在ＳｉＣ中添加１０ｗｔ％的巴基管、１ｗｔ％的Ｂ４Ｃ，烧结温度２０００℃（保温１ｈ，压力２５ＭＰａ）；其性能达到：相对密度９４．７％、抗弯强度（室温）３２１．２２ＭＰａ、断裂韧性３．８２ＭＰａ·ｍ＾１／２。

Study on Carbon Nanotube/Nano-SiC Ceramic Material

Carbon nanotube/nano-SiC ceramic material has been studied in this thesis.The effects of carbon nanotubes,sintering temperatures and additives on the mechanical properties under hot-pressing have been discussed preliminarily.The results indicate that the flexural strength(room temperature) and fracture toughness of nano-SiC increase after adding carbon nanotubes.The optimal process is that SiC containing 10 wt% carbon nanotubes and 1 wt% B4C is hot-pressed at 2000 for 1h under pressure of 25 MPa.And the properties with relative density 94.7%,flexural strength (room temperature) 321.22 MPa and fracture toughness 3.82 MPam1/2 are achieved.