采用反应热压烧结工艺制备了BN-ZrB_2-ZrO_2复合材料.ZrB_2由ZrO_2、B4C、C反应生成,反应方程式为2ZrO_2+B_4C+3C=2ZrB_2+4CO↑.通过改变原始ZrO_2的含量,可以得到ZrB_2与ZrO_2比例不同的55%BN-ZrB_2-ZrO_2复合材料.在1600 ℃,90 min,30 MPa的烧结条件下,复合材料的致密度均达到93%以上.复合材料的抗弯强度、断裂韧性随ZrB_2与ZrO_2比例的降低先升高后降低.当复合材料中ZrB_2与ZrO_2比例的为2.5:1时,复合材料的维氏硬度、抗弯强度、弹性模量、断裂韧性分别为1.74 GPa、291 MPa、118 GPa、4.2 MPa·m~(1/2).
(ZrB_2-ZrO_2)/BN composites were prepared by reactive hot-pressing at 1600 ℃ under 30 MPa for 90 min using BN, ZrO_2, B_4C and C as original materials. ZrB_2 were successfully obtained by following reaction 2ZrO_2+B_4C+3C=2ZrB_2+CO↑. After adjusting the ratio of ZrB_2 and ZrO_2, the 55%BN-ZrB_2-ZrO_2 composite sintered at 1600 ℃, 30 MPa of pressure for 90 min is possessed of more than 93% relative density. With decreasing ZrB_2/ZrO_2 ratio, the mechanical properties of 55vol%BN-ZrB_2-ZrO_2 composites increase first and then decrease, reaching a maximum value at ZrB_2: ZrO_2=2.5:1. The vicker's hardness, elastic modulus, flexural strength and fracture toughness of BN-25%ZrB_2-10%ZrO_2 composite are 1.74 GPa, 291 MPa, 118 GPa, 4.2 MPa·m~(1/2), respectively.
参考文献
| [1] | 顾立德.氮化硼陶瓷[M].Beijing:Chinese Construction Industry Publishing Company,1982:1. |
| [2] | Eichler J;Lesniak C .[J].Journal of the European Ceramic Society,2008,28:1105. |
| [3] | Zhang G J;Ando M .[J].International Journal of Applied Ceramic Technology,2005,2(02):162. |
| [4] | Chamberlain A L;Fahrenholtz W G;Hilmas G E .[J].Journal of the American Ceramic Society,2006,89(02):450. |
| [5] | 胡宝玉;张宏达;李丹 .[J].稀有金属,2004,23(06):31. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%