煤岩样品TEM超薄切片制备方法研究

本文作者以泥炭、褐煤、烟煤及无烟煤为例,探讨了超薄切片制备方法对不同煤阶样品的适用性。在采用包埋切片法制备煤岩样品TEM超薄切片时,首先通过浸解离析方法和HCl、HF逐级化学浸蚀方法使煤中自然共生组合的有机显微组分离析及脱除无机矿物质;利用光学显微镜(透射/反射模式)镜检离析显微组分后,使用SPI812树脂对挑出的单一显微组分块体渗透及包埋聚合。显微组分块体形态学及嵌布矿物成分分析使用扫描电子显微镜的低真空二次电子像模式和EDS面分布分析模式;利用透射电子显微镜检查超薄切片效果。实验表明采用上述方法制备煤岩TEM超薄切片样品的成功率较高,并且能够比较真实的再现显微组分的微观结构。

The preparation method for coal TEM ultrathin sections

Taking peat, brown coal, bituminous coal and anthracite as examples, this paper investigates the applicability of the preparation method of TEM uhrathin section to different rank coal samples. When embedding was used to prepare coal TEM ultrathin section, the symbiotic organic maceral and inorganic mineral in coal were segregated and removed by being macerated in HC1 and HF firstly. Then the individual maceral blocks were picked out with an optical microscope （reflection and transmission mode） and then were treated with infiltration and embedded polymerization with SPI812. The morphology of coal maceral was observed with a scanning electron microscope （SEM） in low vacuum secondary electron image mode, and the mineral composition was analyzed with a surface distribution of energy disperse spectroscopy （ EDS ）. Transmission electron microscopy （ TEM ） was applied to inspect the effect of uhrathin sections. The results show that this preparation method for coal TEM ultrathin section is of high success rate and can realistically reproduce the microstructure of coal maceral.