用于原位中子散射的液压对顶砧系统

A Hydraulic Opposite Anvil System for High-Pressure in-Situ Neutron Diffraction

介绍了一套自主研制的用于高压原位中子衍射测量的液压对顶砧系统(HAL-11)。该系统由內压砧、液压加载系统以及对光系统3部分组成。內压腔能兼容不同尺寸以及不同材质的压砧,如碳化钨、蓝宝石、碳化硅、烧结聚晶金刚石等。液压加载系统通过分离式薄型液压千斤顶可提供高达500kN的加载力,在原位中子散射实验中实时补充由于封垫及样品流变导致的压力下降。对顶砧系统悬挂在四维悬挂式移动平台上,通过两束激光进行对光准直操作,整个系统容易拆卸和组装。使用碳化钨压砧对系统进行压力标定,结果显示,在外加载力为150kN时,HAL-11系统的样品腔体压力能够达到12GPa以上。

A hydraulic opposite anvil system （HAL-11） consisting of an inner anvil cell, a hydraulic loading system,and an alignment system, is developed for high pressure in-situ neutron diffraction. The inner anvil cell can be compatible with various anvils with different culet sizes and materials, such as WC, sapphire,SiC, and sintered polycrystalline diamond. A maximum load up to 500 kN can be pro- vided by the hydraulic loading system through a hydraulic jack with hand pump,and the pressure de- cline caused by the rheology of gasket and specimen can be compensated during the high pressure in- situ neutron diffraction experiments. The opposite anvil system attached on a four dimensional pensile- type translational stage is aligned by means of two lasers, and the entire system can be easily assem bled and distributed. The pressure calibration results show that the sample pressure is above 12 GPa with WC anvils at a loading force of about 150 kN.