机械活化后的Si粉加入发泡剂溶液,搅拌、烘干后得到多孔预制坯体.将坯体在流动氮气氛中引发燃烧合成反应.通过调整原料粉体机械活化时间及预制坯体中稀释剂的含量,制得了不同粒径和长径比的氮化硅粉体.利用XRD和SEM对产物的主要成分和形貌进行了表征.实验结果表明,通过发泡法燃烧合成可制备长径比可控、晶粒发育完全的氮化硅粉体.与传统燃烧合成制备的氮化硅粉体相比,发泡法制备的氮化硅粉体结晶度高,形貌均一性好.
Mechanically activated silicon powders were added to solution with AM/MBAM system and foaming agent. Porous green body with certain strength was attained after stirring and drying. SHS reaction was ignited in N_2 flow to prepareβ-Si_3N_4. Through controlling mechanical activation time and thinner concentration, β-Si_3N_4 powders of different sizes and length/radius ratio were obtained. The product was examined by XRD and SEM, whose results illustrate that foaming SHS is effective in preparing full-grown β-Si_3N_4 particles with controllable length/radius ratio. Compared with β-Si_3N_4 powders by common SHS, the powders by foaming SHS have better crystallinity and morphological homogeneity.
参考文献
| [1] | Haggerty J S;Lightfoot A .[J].Ceramic Engineering and Science Proceedings,1995,16:475. |
| [2] | Fujiu T;Messing G L;Huebner W .[J].Journal of the American Ceramic Society,1990,73(01):85. |
| [3] | Sepulveda P .[J].American Ceramic Society Bulletin,1997,76(10):61. |
| [4] | Sepulveda P;Binner J G .[J].Journal of the European Ceramic Society,1999,19:2059. |
| [5] | Ortega F S;Sepulveda P;Nnocentini M D M et al.[J].American Ceramic Society Bulletin,2001,80(04):37. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%