Pressure-transmitting properties of pyrophyllites from different localities
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摘要: 作为密封传压介质，叶蜡石已被广泛应用于实验室和工业的高压合成中。然而，叶蜡石中矿物成分的改变将影响其传压效率及密封性。本研究中在6 × 8 MN大腔体六面顶压机中完成4种不同产地叶蜡石在室温下的压力标定工作，并通过X射线衍射研究叶蜡石中矿物组成的变化对传压效率的影响。结果表明：叶蜡石中含有较高硬度的矿物（如水铝石、勃姆石、白云母和高岭石），可有效提升叶蜡石的传压效率；随着腔体压力提升，叶蜡石的传压效率逐渐降低，施加更高的实际加载力（油压）也不能明显地提高腔体压力；高压处理后的叶蜡石4比叶蜡石2有更好的传压效率，但受矿物成分变化的影响，叶蜡石4容易发生密封失效，而叶蜡石2有良好的弹性回复效果和密封性，能够稳定完成升压卸压过程。综合考虑传压效率和密封效果，叶蜡石2具有最佳的应用价值和经济效益。Abstract:
Objectives Pyrophyllite, as a sealed pressure medium, has been widely used in high-pressure research for laboratories and industrial synthesis. A highly efficient pressure transfer medium can generate higher cell pressure at the same loading force. The use of a highly efficient pressure transfer medium reduces the risk of anvil rupture and production costs. Therefore, it is important to develop a suitable and efficient pressure-transmitting pyrophyllite. Methods The pressure calibration of four pyrophyllites from different localities at room temperature was conducted in a 6 × 8 MN multi-anvil large-volume press. The relationship between loading force and cell pressure at room temperature was established. The influence of mineral composition changes in pyrophyllite on pressure-transmitting efficiency was studied using X-ray diffraction. Results By investigating the influence of mineral composition changes in pyrophyllite on pressure-transmitting efficiency, the results are as follows: (1) When achieving the same cell pressure, the required loading force for Pyrophyllite 4 is 10% lower than those for the other three pyrophyllites, indicating that Pyrophyllite 4 has the best pressure-transmitting efficiency. (2) As cell pressure increases, the relationship between cell pressure and loading force begins to deviate from linearity, and the pressure-transmitting efficiency of pyrophyllite gradually decreases. When the cell pressure exceeds 5.00 GPa, applying higher loading force does not significantly increase the cell pressure. (3) Higher hardness minerals (such as Diaspore, Boehmite) in pyrophyllite can effectively improve pressure-transmitting efficiency in the low-pressure stage (cell pressure 2.55-3.68 GPa). When the minerals in pyrophyllite undergo phase transformation to form new minerals with higher hardness (such as Muscovite and Kaolinite) in the high-pressure stage (cell pressure of 5.50 GPa), pressure-transmitting efficiency can be effectively improved. Conclusions Pyrophyllite 4 has better pressure-transmitting efficiency than Pyrophyllite 2 does in the high-pressure stage, but it is prone to failure in sealing due to the changes in mineral composition. However, Pyrophyllite 2 shows good elastic recovery effect and sealing performance and can stably complete compression and decompression work. Considering both pressure-transmitting efficiency and sealing effect, Pyrophyllite 2 has better application value and economic benefits. -
Key words:
- pyrophyllite /
- pressure-transmitting efficiency /
- cell pressure /
- loading force /
- mineral composition
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图 3 标压物质的电阻与4种叶蜡石对应的加载力的关系
Figure 3. The resistances of calibration-pressure wires versus the corresponding loading force for four pyrophyllites
图 4 4种叶蜡石的腔体压力和加载力的关系图
Figure 4. The relationship between cell pressure and loading force for four pyrophyllites
图 5 4种叶蜡石经高压处理前后的XRD图谱
Figure 5. XRD patterns of four pyrophyllites before and after high-pressure treatment
表 1 4种叶蜡石的密度和颜色
Table 1. Density and color of four pyrophyllites
叶蜡石 1 2 3 4 密度 ρ / (g·cm−3) 2.60 2.61 2.63 2.60 颜色 黄白 黑灰 黑 灰白 
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表 2 4种不同叶蜡石的压力标定结果
Table 2. Result of pressure calibration of four pyrophyllites
标压物质 相变类型 相变压力 p / GPa 平均加载力 F / MN 叶蜡石1 叶蜡石2 叶蜡石3 叶蜡石4 Bi I-II 2.55 1.70 1.80 1.79 1.55 Tl II-III 3.68 3.04 3.03 3.11 2.82 Ba I-II 5.50 5.59 5.50 5.61 4.88
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