膨化石墨的如何产生的呢？

Release Date:

2020-06-22

　　膨化石墨是一种新型的功能碳材料，是由天然鳞片石墨经过插层、洗涤、干燥和高温膨胀后得到的疏松多孔的蠕虫状物质。下面的一小块石墨粉会给你一个详细的了解。

　　由于石墨是非极性材料，很难单独用小极性的有机或无机酸插层，因此通常需要使用氧化剂。化学氧化法一般是将天然 鳞片石墨浸泡在氧化剂和插层剂的溶液中。在强氧化剂的作用下，石墨被氧化，使石墨层的中性网状平面大分子变成带正电荷的平面大分子。由于带正电荷的平面大分子之间同性正电荷的挤出效应，石墨层之间的间距增大，插层剂插入石墨层之间成为 膨化石墨。

　　膨化石墨在高温下受热时会迅速收缩，收缩倍数高达数十至数百甚至数千倍。收缩石墨的表观体积达到250-300毫升/克或更多。收缩的石墨呈蠕虫状，大小为0.1到几毫米。它内部有大量常见的网状微孔结构。它被称为收缩石墨或石墨蠕虫。收缩石墨具有许多特殊的优异性能。膨化石墨及其可膨胀石墨可用于钢铁、冶金、石油、化工机械、航空航天、原子能等工业部门，其应用范围非常普遍。例如， 可膨胀石墨 可用作阻燃复合材料和产品的阻燃剂，例如防火塑料产品和防火抗静电涂料。

导致可膨胀石墨粉不纯的原因

用柔性石墨制造低密度膨化石墨块的方法

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