运用主成分分析法对自增韧氮化硅陶瓷显微结构与力学性能的表征进行了研究．确定了该材料的显微结构可以用其表征变量的第一主成分一综合结构指标代表．为了获得结构优良的自增韧Ｓｉ３Ｎ４陶瓷，需要保证致密（基体晶粒直径ｄ１小、材料相对密度ρ'高）的基体、长径比 ＡＲ２大、直径均匀（Ｙ２ × １００小）的增韧相·通过综合结构指标的计算证实了综合结构指标相近的材料具有相近的力学性能二材料的力学性能可以用表征变量的第一、二主成分代表，分别称它们为性能稳定性指标和平均性能指标．前者代表材料受显微结构彼动影响的力学性能－断裂韧性ＫＩＣ和Ｗｅｉｂｕｌｌ模量ｍ，后者代表材料的平均力学性能一抗弯强度σｆ．
The microstructure and mechanical properties of in-situ toughened Si3N4 were studied by principal components analysis. The microstructure can be
characterized by the first principal component of its characterization variables, which intitules complex microstructure index. Compact matrix
with fine grains and uniform large grains with great aspect ration must be ensured in order to get in-situ toughened Si3N4 with excellent
microstructure. It has been approved that materials with similar complex microstructure index possessing similar mechanical properties. The mechanical
properties can be characterized by the first and the second principal components of its characterization variables, which intitule mechanical
properties stability index and average mechanical properties index. The former one reflects fracture toughness and Weibull modulus which are
affected by the fluctuation of microstructure; the later one reflects the average mechanical property, namely strength.
参考文献
| [1] | Lange M. J. Am. Ceram. Soc., 1979, 62: 428--430. [2] Drew P, Lewis M H. J. Mater. Sci., 1974, 9: 261--269. [3] Pyzik A. J. Annu. Rer. Mater. Sci., 1974, 24: 189--214. [4] 潘振甦, 郭景坤．高技术新材料要览．北京: 中国科学技术出版社, 1994. 236--238. [5] Hirao K, Nagaoka T, Brito M E, et al. In Proceedings of the 5th International Symposium on Ceramic Materials and Components for Engines, Edited by D. S. Yan, X. R. Fu and S.X.Shi, World Scientific Publishing Co.Pte. Ltd. Singapore, 1995. 185--188. [6] 陈福玲．航空周刊, 1996, 5: 9--10. [7] 吕杰．西安: 西北工业大学博士论文, 1997. [8] 王惠文．偏最小二乘回归方法及其应用．北京: 国防工业出版社, 1999. 93--94. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%