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以甲烷和三氯化硼的混合气为反应气体,采用化学气相沉积法制备硼掺杂玻璃炭材料。利用X射线衍射仪、拉曼光谱仪、扫描和透射电子显微电镜对沉积产物的微观结构进行表征。结果表明,沉积产物是一种玻璃炭材料,但在其基体中均匀分布着约20 nm的碳化硼颗粒。由于硼元素强烈的催化石墨化作用,硼掺杂玻璃炭表现出完全不同于传统玻璃炭材料的石墨化行为。硼掺杂玻璃炭经高温热处理后,其结构发生剧烈变化而转变为片层炭结构,其转变过程可能遵循“固溶-析出”机制。
A mixed gas of methane and boron trichloride was used as a reaction gas to prepare a boron-doped glassy carbon material by a chemical vapor deposition method. The microstructure of the deposited product was characterized by X-ray diffraction, Raman spectroscopy, scanning and transmission electron microscopy. The results show that the deposited product is a kind of glassy carbon material, but the boron carbide particles about 20 nm are uniformly distributed in the matrix. Due to the strong catalytic graphitization of boron, boron-doped glassy carbon shows a completely different behavior from the graphitization of traditional glassy carbon materials. Boron doped glassy carbon after high temperature heat treatment, the structure changes drastically into lamellar carbon structure, the transformation process may follow the “solution - precipitation ” mechanism.