B–Si–Zr掺杂炭材料的制备及其抗氧化性能

Preparation and Oxidation Resistance of B–Si–Zr Doped Carbon Materials

以煤沥青甲苯可溶组分、聚碳硅烷、吡啶硼烷和ZrB_2有机前驱体为原料,通过低温裂解制备掺杂沥青,经过不同温度热处理得到B–Si–Zr掺杂炭材料,考察了掺杂炭材料抗氧化性能。用X射线衍射仪、扫描电子显微镜等对B–Si–Zr掺杂炭材料氧化前后的物相组成和微观结构进行表征。结果表明:1600℃热处理得到的B–Si–Zr掺杂炭材料中,ZrB_2陶瓷颗粒逐渐形成,在氧化过程中,SiC和ZrB_2等陶瓷与氧气反应生成SiO_2、B_2O_3和ZO_2,氧化物在炭材料表面形成保护膜,该热处理温度得到的掺杂炭材料抗氧化性较强。

B-Si-Zr doped carbon materials were prepared via heat treatment at different temperatures with toluene soluble fraction of coal tar pitch, polycarbosilane, pyridine borane and ZrB2 precursor as raw materials. The oxidation behavior of B-Si-Zr doped carbon materials was investigated. The phase composition and microstructure of the samples were characterized by X-ray diffraction and scanning electron microscopy. The results show that ZrB2 ceramic particles are gradually formed in the heat treatment of carbon materials at 1 600℃. The reaction among SiC, ZrB2 and oxygen produces SiO2, B2O3 and ZrO2 in the process of oxidation. The oxide can form a protective film on the surface of the carbon materials, which improves the oxidation resistance of the B-Si-Zr doped carbon materials obtained by heat treatment at 1 600 ℃.