采用热梯度强制流动化学气相渗积(FCVI)工艺制备SiCf/SiC复合材料,测试了复合材料的性能。制备的复合材料密度达到2.3g/cm3,强度为291 MPa,断裂韧性为11.4 MPa*m1/2。运用SEM,TEM,X射线衍射等分析手段对复合材料的微观结构进行了表征。结果表明:渗积的基体材料为β-SiC,晶粒尺寸为亚微米级,结晶度良好。通过对断口形貌的观察,分析了增韧机制。
SiCf/SiC composite was fabricated by forced flow thermal-gradient chemical vapor infiltration (FCVI). The density of composite is 2.3g/cm3.The flexural strength and fracture toughness of SiCf/SiC compsites were tested: the flexural strength is 291 MPa, the fracture toughness is 11.4 MPa*m1/2. The microscopy structure was characterized by SEM, TEM and X-ray diffraction. The results show that SiC matrix fabricated by FCVI is β-SiC, which has sub-micron grain size and good crystallinity.And the toughening mechanism was also investigated by morphology of the fractrue surface.
参考文献
[1] | L Guillaumat;J Lamon .[J].Composites Science and Technology,1996,56:803-808. |
[2] | J L Chermant .[J].Key Engineering Materials,1995(108-110):269-282. |
[3] | P Lipetzky;G J Dvorak;N S Stoloff .[J].Materials Science and Engineering,1996,A216:11-19. |
[4] | C Droillard;J Lamon .[J].Journal of the American Ceramic Society,1996,79(04):849-858. |
[5] | W J Lackey .[J].Ceramic Engineering and Science Proceedings,1989,10(7-8):577-584. |
[6] | A J Caputo;W J Lacket .[J].Ceramic Engineering and Science Proceedings,1984,5(05):654-667. |
[7] | C G Cofer et al.[J].Ceramic Engineering and Science Proceedings,1994,15(05):447. |
[8] | S T Schwach et al.[J].Ceramic Engineering and Science Proceedings,1994,15(05):1093. |
[9] | R Naslain .[J].Advances in Composite Materials,1999,8(01):3-16. |
[10] | C Y Ho et al.[J].Ceramic Engineering and Science Proceedings,1992(13):3-13. |
- 下载量()
- 访问量()
- 您的评分:
-
10%
-
20%
-
30%
-
40%
-
50%