通过ＡＦＭ研究，发现硅质煤矸石的两种主要组成ＳｉＯ２和Ｃ具有纳米粒状结构和纳米层状结构．ＳｉＯ２纳米颗粒的尺度为３～２０ｎｍ，Ｃ质纳米颗粒的尺度为１０～２０ｎｍ．纳米层厚为５～８０ｎｍ．矸石中的ＳｉＯ２和Ｃ呈密接触状态．用这种结构的煤矸石为原料，在１３００℃时就可合成β－ＳｉＣ，其合成温度明显低于人工混合物料同等条件下的合成温度，而且产率也可大幅度提高．
The nanoparticle structure and nanolayer structure of SiO2 and C in a silicious gangue were found by Atomic Force Microscope. The size of nanoparticle SiO2 is 3~20nm, the size of nanoparticle C is 10~20nm and the thick of nanolayer is 5~80nm in the gangue. SiO2 and C in the gangue are contacted tightly each other.β-SiC ultrafine powder was synthesized at 1300℃ with the gangue. The temperature is lower obviously than that synthesizing SiC with other raw materials mixed under the same conditions. And SiC yield can also be increased greatly.
参考文献
| [1] | 王晓刚，陈维，陈寿田, 等. 煤炭学报，1998, 23 (3): 327--331. [2] Binning G, Quate C F, Genber C. Physical Review Letters, 1986, 56 (9): 930--933. [3] Meyer E, Heinxelmann H, Gnutter P, et al. Appl. phys. Let., 1989, 55 (16): 1624--1626. [4] 刘宝捃. 沉积岩石学. 北京：地质出版社，1980. 225--232. [5] Herron N. J. Phys. chem., 1991, 95: 525--529. |
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