以酚醛树脂为碳源,采用凝胶注模成型工艺,成功地制备出了具有较高气孔率、高强度、结构比较均匀的氮化硅多孔陶瓷.结果表明,制备出的坯体结构均匀、加工性能优良,烧成的多孔氮化硅陶瓷强度78MPa,扎孔率可达63%.借助热重分析(TG)、红外分析仪(IR)、X射线衍射(XRD)、扫描电子显微镜(SEM)、Archimedes法和三点弯曲法等方法对多孔氮化硅陶瓷的微观结构的形成和基本力学性能进行了研究.SEM照片显示气孔是由长柱状β-Si3N4晶搭接而成的,典型的纤维状多孔材料.SRD图谱显示有玻璃碳产生;酚醛树脂裂解所得的玻璃碳与Si3N4表面的SiO2以及Si3N4颗粒本身反应生成了SiC增强相.发育良好的柱晶结构、均匀的气孔分布、以及反应生成的SiC微晶是在材料在高气孔率下仍保持高强度的主要原因.
参考文献
| [1] | Zhou L G;Huang Y;Xie Z P et al.Gas - discharging reactions and their effect on the microstructures of green bodies in gelcasting of non -oxide materials[J].Materials Letters,2000,45(01):51-57. |
| [2] | Meng G.;Wang H. .Preparation of porous ceramics by gelcasting approach[J].Materials Letters,2000(3/4):224-227. |
| [3] | Jian-Feng Yang;Guo-Jun Zhang;Tatsuki Ohji .Fabrication of Low-Shrinkage, Porous Silicon Nitride Ceramics by Addition of a Small Amount of Carbon[J].Journal of the American Ceramic Society,2001(7):1639-1641. |
| [4] | 徐复铭,周伟良.Resol型酚醛树脂热解特征的TG-MS 研究[J].宇航材料工艺,2003(01):18-23. |
| [5] | Vix G C;Mcenaney B;Ehrburger P .SiC material produced by carbothermal reducetion of a freeze gel silica- carbon artifact[J].Journal of the European Ceramic Society,1999,19(04):427-432. |
| [6] | Yang J F;Zhang G J;Nalki Kondo et al.Synthesis and properties of porous Si3N4/SiC nanocomposites by carbothermal reaction between SiN4 and carbon[J].Acta Materialia,2002,50(19):4831-4840. |
| [7] | Katsutoshi K;Minoru M;郭景坤.高温工程陶瓷[A].北京:科学出版社,1998:469-472. |
| [8] | Heinrich J;Bitterlich B .Aqueous tape casting of silicon nitride[J].Journal of the European Ceramic Society,2002,22(13):2427-2434. |
| [9] | Carroll D F .Processing of superfine tungsten carbide at high cobalt contents[J].Metal Powder Report,1998,53(12):40-43. |
| [10] | Hampshire S;郭景坤.氮化物陶瓷[A].北京:科学出版社,1998:122-127. |
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%