采用化学气相浸渗法（ＣＶＩ），制备出三维Ｈｉ－ＮｉｃａｌｏｎＳｉＣ／ＳｉＣ陶瓷基编织体复合材料．经３０ｈ ＣＶＩ致密化处理后，复合材料的密度达到 ２５９·ｃｍ－３，所研制的三维 ＳｉＣ／ＳｉＣ复合材料不仅具有较高的强度，而且表现出优异的韧性和类似金属材料非灾难性的断裂特征．复合材料的主要力学性能指标为：弯曲强度 ８６０ＭＰａ，断裂位移 １．２ｍｍ，断裂韧性４１．５ＭＰａ·ｍ１／２，断裂功２８．１ｋＪ·ｍ－２，冲击韧性３６．０ｋＪ·ｍ－２．
Three dimensional textile SiC/SiC composites were fabricated by chemical vapor infiltration, and
their mechanical properties and microstructure were investigated. The density of the composites was 2.5g·cm-3 after the
preform was infiltrated for 30 hours. The present composite materials exhibited excellent mechanical properties and metal-like failure behavior.
The flexural strength and displacement were 860MPa and 1.2mm, respectively. Fracture toughness and work of fracture were 41.5MPa·m1/2 and
28.1kJ·m-2, respectively. The dynamic toughness was determined by using Charpy impact method and its value was 36.0kJ·m-2.
参考文献
| [1] | Evans A G. J. Am. Ceram. Soc., 1990, 73: 187. [2] Naslain R. Key Eng. Mater., 1998, 164-165: 3--8. [3] Golecki I. Mater. Sci. Eng., 1997, R 20: 37--124. [4] Lackey J, Hanigofsky J A, G B Freeman, et al. J. Am. Ceram. Soc., 1995, 78: 1564--1570. [5] Stinton D P, Besmann T M, Lowden R A. Am. Ceram. Soc. Bull., 1988, 67 (2): 36. [6] Inghels E, Lamon J. J. Mater. Sci., 1991, 26: 5403. [7] Xu Y D, Zhang L T. J. Am. Ceram. Soc., 1997, 80: 1897. [8] Xu Y D, Zhang L T, Cheng L F, et al. Carbon, 1998, 36: 1051. [9] Clegg W J, Kendall K, McN Alford N, et al. Nature, 1990, 347: 455--457. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%