冲击波温度和压力对二氧化钛相变的影响

 介绍了一种简便易行的降低疏松固体物质冲击波温度的方法，其要点是用液体石蜡充填样品的空隙。以用粉末锐钛矿压装成型的样品为例，对比了不充填和充填液态石蜡时冲击波作用的结果。在同样的冲击加载条件下（均为钢飞片，撞击速度为3.16 km/s），估算两种样品中达到的压力分别为36.3 GPa和46.8 GPa，平均温度分别约为4.7×10³ ℃和2.0×10³ ℃，即：充填液态石蜡的样品中压力增加了约10 GPa，但平均温度降低了近3×10³ ℃。对冲击后回收样品的分析结果表明，不充填石蜡样品的主要产物为金红石，即冲击波产生的高温起了主要作用。而充填液态石蜡时，主要生成β-TiO₂高压相，即高压起了主要作用。

EFFECTS OF THE SHOCK TEMPERATURE AND ITS PRESSURE ON PHASE TRANSITION OF ANATASE TiO 2

A simple method was introduced to reduce the shock temperature of porous solid sample under shock wave loading by filling the sample with liquid paraffin. Anatase TiO₂ was used as an example, results were compared for samples not filled and filled with liquid paraffin. In the former case, rutile is the main product, that is, phase transition occurs under the action of high shock temperature, while for the sample filled with liquid paraffin, β-TiO₂ (high pressure phase) is the main product, which shows that high pressure plays the dominant role, and the temperature produced by shock waves is much lower than that in the former case and only plays a minor role in the phase transition of anatase.