Development of 850MPa internally heated gas medium high pressure apparatus with quenching capability

日本岛屿特有的地质现象(例如火山作用、断层和地壳变形、变质作用和矿床的形成)都发生在地壳内(浅于30公里深)。内热式气体介质高压装置(或热等静压，HIP)将是研究地壳深处这些地质现象的最重要工具。由于法律的严格规定，HIP仪器在日本地球科学家中并不受欢迎。在SOO Mpa范围之外，山口县的一家材料研究实验室只有一个手术髋关节。在这个项目中，我们与Kobelco公司合作开发了一种新的HIP(SMC-8500)，它能够进行高达850兆帕的实验。SMC-8500具有较大的血管尺寸(直径65 mm，长400 mm)，带有淬火装置，在每次实验结束时切断试件的悬丝。SMC-8500的内部压力可以通过高达200 mpa的压力计直接测量。超过200 mpa时，只能通过主活塞的液压来估算内部压力。结果表明，液压缸内气体压力与液压缸之间存在较大的摩擦损失(可能在气密封处)。我们已经测试过，可以通过锰铜导线中的电阻变化来监测内部气体压力。使用锰铜作为内标尺，SMC-8500的内部气体压力可由液压系统控制。

Geologic phenomena that characterize Japanese islands (e.g., volcanism, faulting and crustal deformation, metamorphism, and formation of ore deposits) are taking place within the crust (shallower than 30 km depth). Internally heated gas medium high-pressure apparatus (or hot isostatic press, HIP) would be the most important tool to study these geologic phenomena at crustal depths. Due to the rigorous regulation by law, HIP apparatuses have not been popular among Japaese earth scientists. Beyond SOOMPa range, only one operating HIP exists in a material research laboratory in Yamaguchi Prefecture. In this project, with KOBELCO Co. we have developed a new HIP (SMC-8500), which is capable to conduct experiments up to 85OMPa. The SMC-8500 has relatively large vessel size (65 mm diameter and 400mm long) with quenching device by cutting the hanging wire of the specimen at the termination of each experiment. The internal pressure of the SMC-8500 can be measured directly by a pressure gauge up to 200MPa. Beyond 200MPa the internal pressure can be estimated only through hydraulic pressure of the main piston. It was found that there is a large frictional loss (perhaps at the gas sealing part) between the hydraulic presssure and the internal gas pressure. We have tested that the internal gas pressure can be monitored by resistance change in a Manganin wire. Using the Manganin as an internal scale, the internal gas pressure of the SMC-8500 can be controlled by the hydraulic system.