通过B4C和WC之间的固相反应热压烧结制备C/W2B5复合材料,并研究了W2B5含量对复合材料显微结构和性能的影响.结果表明该复合材料具有较高的致密度,最高达100%;生成的W2B5颗粒呈板片状,且随碳含量的增加,其尺寸减小.复合材料具有优异的力学性能和导电性,其强度和韧性最大值分别为786.2±91.2 MPa和8.89±0.68MPa·m1/2,电阻率最低仅为0.61μΩ·m.分析认为高强度和低电阻率主要归因于高致密度和高强度、低电阻率的W2B5相的生成,而较高的韧性来源于板片状W2B5颗粒和残余应力所产生的裂纹桥接,偏转增韧机制.
参考文献
[1] | 颜冲;肖汉宁;杨巧勤 等.[J].陶瓷研究,1999,14(03):4. |
[2] | Wen G.;Li S.B. .PROCESSING OF IN SITU TOUGHENED B-W-C COMPOSITES BY REACTION HOT PRESSING OF B_4C AND WC[J].Scripta materialia,2000(9):853-857. |
[3] | Kenji Miyazaki;Tsuyoshi Hagio;Kazuo Kobayashi .[J].Journal of Materials Science,1981,16:752. |
[4] | Guangjin Zhang;Quangui Guo;Zhanjun Liu et al.[J].Journal of Nuclear Materials,2002,301:187. |
[5] | Julie Runyan;Rosario A. Gerhardt;Robert Ruh .Electrical Properties of Boron Nitride Matrix Composites: I, Analysis of McLachlan Equation and Modeling of the Conductivity of Boron Nitride-Boron Carbide and Boron Nitride-Silicon Carbide Composites[J].Journal of the American Ceramic Society,2001(7):1490-1496. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分:
-
10%
-
20%
-
30%
-
40%
-
50%