Bridgman压砧上叶蜡石封垫预烧工艺与内加热方式的改进

摘要

We investigated the effects of the roasting course on behaviors of the pyrophyllite gasket under high pressures using Bridgman anvils.The results show that high roasting temperature is bene-ficial to increase the critical thickness and enlarge the area of the elastic central region of pyrophyllite gaskets,which helps to effectively enlarge the size of the sample chamber.The pressure calibration was carried out using the high-temperature (maximum 900℃)roasted pyrophyllite gasket.And based on this calibration,we measured the temperature at the center of the sample cavity with the improved internal heating assembly under ambient and high pressures respectively.The improved internal heat-ing assembly expanded the heating range up to 1 300℃ under 4·0 GPa,which provides a much greater variety of conditions for the preparation of bulk metastable materials in the Bridgman anvils.%在Bridgman压砧上研究了不同预烧工艺对叶蜡石封垫高压性能的影响，发现提高焙烧温度有助于提高叶蜡石封垫的临界厚度和中心弹性区面积，能有效扩大样品腔尺寸，并对高温焙烧（最高900℃）的叶蜡石封垫进行了压力标定。在此基础上，对叶蜡石封垫的内加热组装方式进行了改进，并在常压和高压下分别测试了新组装方式的加热性能，实现了4·0 GPa高压下1300℃温度范围内的加热。这些实验工作为进一步开展在 Bridgman压砧上制备大尺寸亚稳材料提供了实验条件。