A new large-volume multianvil system
A new large-volume multianvil system
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DOI：
10.1016/j.pepi.2004.03.003
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发表时间：
2004-06-15
影响因子：
2.3
通讯作者：
Rubie, DC
中科院分区：
文献类型：
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作者：
Frost, DJ;Poe, BT;Rubie, DC
巴伐利亚地质研究所开发了 6-8 Kwai 型多砧装置的放大版本，可在传统系统可达到的压力和温度范围内运行，但样本量要大得多。该分体缸多砧系统与液压机配合使用，可产生高达 5000 吨 (50 MN) 的负载。六个工具钢外砧限定了一个边长为 100 毫米的立方体空腔，其中压缩了八个 54 毫米碳化钨立方体内砧。使用 Cr2O3 掺杂的 MgO 八面体和叶腊石垫片进行实验。室温和高温下的压力校准已使用 14/8、18/8、18/11、25/17 和 25/15 OEL/TEL（八面体边长/砧截断边长，以毫米为单位）配置进行。所有测试的配置都达到了一个极限平台，其中样品压力不再随着施加的负载而增加。不同配置的校准表明，通过增加 OEL/TEL 比率可以实现更高的样品压力效率。对于 18/8 配置，在 2500 吨的负载下即可达到间隙过渡，而使用 14/8 组件，即使在更高的负载下也无法达到该压力。在施加 2000 吨的负载时，18/8 可以在 1900 摄氏度下产生 MgSiO3 钙钛矿，样品体积约为 20 mm(3)，相比之下
A scaled-up version of the 6-8 Kwai-type multianvil apparatus has been developed at the Bayerisches Geoinstitut for operation over ranges of pressure and temperature attainable in conventional systems but with much larger sample volumes. This split-cylinder multianvil system is used with a hydraulic press that can generate loads of up to 5000 t (50 MN). The six tool-steel outer-anvils define a cubic cavity of 100 mm edge-length in which eight 54 mm tungsten carbide cubic inner-anvils are compressed. Experiments are performed using Cr2O3-doped MgO octahedra and pyrophyllite gaskets. Pressure calibrations at room temperature and high temperature have been performed with 14/8, 18/8, 18/11, 25/17 and 25/15 OEL/TEL (octahedral edge-length/anvil truncation edge-length, in millimetre) configurations. All configurations tested reach a limiting plateau where the sample-pressure no longer increases with applied load. Calibrations with different configurations show that greater sample-pressure efficiency can be achieved by increasing the OEL/TEL ratio. With the 18/8 configuration the GaP transition is reached at a load of 2500 t whereas using the 14/8 assembly this pressure cannot be reached even at substantially higher loads. With an applied load of 2000 t the 18/8 can produce MgSiO3 perovskite at 1900 degreesC with a sample volume of similar to20 mm(3), compared with