煤基石墨微结构的高分辨电镜研究

HRTEM STUDIES OF MICROSTRUCTURES OF COAL-BASED GRAPHITE

煤体经热变质作用形成的石墨叫煤基石墨。湖南省鲁塘地区煤基石墨,经与之共生的红柱石的相图分析,它属于低压相系矿物,在200—800℃和5.5×10~5Pa以下条件下形成。它的高分辨电子显微象显示,煤基石墨按其石墨化程度有四种类型微结构。因而。将煤基石墨划分为相继的四个石墨化阶段。同时有四种石墨产物,它们是:前石墨化阶段——芳层石墨;初石墨化阶段——微柱石墨;中石墨化阶段——柔绉石墨;

Graphite formed in response to thermal contact metamorphism of coal bodies is referred to as the coal-based graphite. The coal-based graphite taken from the Lutang area, Hunan Province is assigned to a mineral of low pressure phase series, which was formed at 200-800℃ and 5.5×10~5Pa in terms of the phase diagram analysis of andalusite associated with it. The HRTEM examination shows that there are rour types of microstructure indicative of varying degree of graphitization in the coal-based graphite, and therefore four progressive stages of graphitization can be distinguished and four kinds of graphite will be produced in response to the four stages:1. pregraphitization——aromatic layer graphite:2. preliminary graphitization——micro-column graphite3. moderate graphitization——wrinkled graphite: and4. high graphitization——stiff graphite.