利用围压提高二级大腔体静高压装置压力极限的初步实验探索

王永坤; 贺端威; 陈宏洋; 王文丹; 刘方明; 何飞; 张瑜; 胡艺; 寇自力; 彭放; 高上攀; 马迎功; 杨兴辉

doi:10.11858/gywlxb.2015.03.010

利用围压提高二级大腔体静高压装置压力极限的初步实验探索

doi: 10.11858/gywlxb.2015.03.010

四川大学原子与分子物理研究所高压科学与技术实验室，四川成都 610065

基金项目: 国家自然科学基金(51472171, 11427810)；国家自然科学基金委-中国科学院联合基金(U1332104)

详细信息

作者简介:
王永坤(1987—), 男，硕士，主要从事大腔体静高压技术、超硬材料合成和高压材料物性研究.E-mail:wyk2008xynu@163.com

通讯作者:
贺端威(1969—), 男，博士，教授，博士生导师，主要从事高压科学与技术、超硬材料及纳米材料的研究.E-mail:duanweihe@scu.edu.cn

中图分类号: O521.3
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出版历程
- 收稿日期: 2014-12-08
- 修回日期: 2014-05-07

Preliminary Experiment Exploring for Improving Pressure Limit of Two-Stage Hydrostatic High-Pressure Apparatus Using Confining Pressure

High-Pressure Science and Technology Laboratory, Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China

摘要

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。
- 围压 /
- 二级大腔体 /
- 高压装置 /
- 压力标定
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.
- confining pressure /
- two-stage large volume /
- high pressure apparatus /
- pressure calibration

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图 1 WC-Co立方块示意图

Figure 1. Schematic of WC-Co cubes

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图 2 WC-Co台棱和圆片示意图

Figure 2. Drawings of WC-Co platform and WC-Co wafer

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图 3 实验Ⅰ最终组装实物照片

Figure 3. Physical photos of the final assemblies for Experiment Ⅰ

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图 4 二级增压单元组装实物图

Figure 4. Physical photos of two-stage pressurizing unit

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图 5 实验Ⅲ最终组装实物照片

Figure 5. Physical photos of final assemblies for Experiment Ⅲ

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图 6 实验Ⅰ中卸压后二级增压单元内部实物照片

Figure 6. Physical photos in the two-stage pressurization units of Experiment Ⅰ after decompressing

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图 7 ZnTe电阻随加载变化的曲线

Figure 7. Relations between the ZnTe resistance and loading in Experiment Ⅰ

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图 8 实验Ⅱ中卸压后二级增压单元内部实物照片

Figure 8. Physical photos in the two-stage pressurization units of Experiment Ⅱ after decompressing

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图 9 不同围压材料及传压介质条件下的二级压腔压力标定

Figure 9. Pressure calibration of the second-stage cell with different confining pressure materials and pressure transmitting cemented carbides

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图 10 实验Ⅲ中卸压后二级增压单元内部的实物照片

Figure 10. Physical photos in the two-stage pressurization units of Experiment Ⅲ after decompressing

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图 11 铰链式六面顶6×14 MN压机的力学简化模型

Figure 11. Simplified mechanics model of the hinge-type cubic-anvil 6×14 MN press

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图 12 基于6×14 MN压机的一级压腔压力标定

Figure 12. Pressure calibration of the first-stage cell based on 6×14 MN press

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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

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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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