Preliminary Experiment Exploring for Improving Pressure Limit of Two-Stage Hydrostatic High-Pressure Apparatus Using Confining Pressure
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摘要: 采用基于国产铰链式六面顶压机二级6-8型大腔体静高压装置中的10/4(即八面体传压介质边长为10 mm, 二级WC-Co硬质合金立方块截角边长为4 mm)组装,选择不同的围压材料和传压硬质合金台棱、圆片,在室温下用ZnTe的高压相变对压腔进行了压力标定。实验结果表明,叶蜡石是较合适的围压材料; 但由于传压台棱、圆片自身强度的限制,及一级压腔形成的围压值较低等原因, 致使实验没有达到预期的末级压砧围压增强效果。通过结合两种压腔的力学简化模型分析得知,围压材料与二级增压装置的预密封边共同形成了二级压腔的密封边,该大面积密封边消耗了系统的大部分加载力,因此在围压实验中没有观测到二级6-8型大腔体静高压装置压力极限的提高。Abstract: In this study, we choose different confining pressure materials, pressure transmitting WC-Co platforms and WC-Co wafers, to calibrate pressure of 10/4 (The edge length of octahedral transmitting pressure medium is 10 mm/the truncated angle edge length of WC-Co cemented carbide anvil is 4 mm) assembly of two-stage 6-8 type hydrostatic high-pressure apparatus based on the hinge-type cubic-anvil 6×8 MN press at room temperature, using phase transition of ZnTe under high pressure.The experimental results show that the pyrophyllite is a relatively ideal confining pressure material, but it can not pressurize obviously because of the strength limitations of platforms and wafers.By combining simplified mechanics model of 2 kinds of presses, we also find out that the large-area gasket, formed by pre-gasket and initial confining pressure material together, consumes most of the loading, and the gap is oversized between the first anvils.Therefore, we did not observe any improvement of the 10/4 assembly pressure limit in our experiments.
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表 1 基于6×14 MN六面顶压机, 相同油压下对应的实际压力、理想压力及压力损失率
Table 1. Actual pressure, ideal pressure and pressure loss ratio at the same oil pressure based on cubic-anvil 6×14 MN press
Oil
pressure/
(MPa)Actual
pressure/
(GPa)Ideal
pressure/
(GPa)Pressure
loss ratio/
(%)40 5.0 10.00 50.0 25 3.7 6.25 41.0 15 2.5 3.75 33.3 表 2 基于6×8 MN压机二级6-8型大腔体高压装置的标准10/4组装, 相同油压下的实际压力、理想压力及压力损失率
Table 2. Actual pressure, ideal pressure and pressure loss ratio at the same oil pressure employing standard 10/4 assemble of two-stage 6-8 type pressure apparatus based on the domestic cubic-anvil 6×8 MN press
Oil pressure/(MPa) Actual pressure/(GPa) Ideal pressure/(GPa) Percentage of pressure loss/(%) 33 18.8 165 89 22 15.6 110 86 16 11.5-13.0 80 84 12 8.5-9.2 60 84 6 5.0 30 83 -
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