Anvil cell high pressure device for in situ neutron diffraction

Abstract

The invention discloses an anvil cell high pressure device for the in situ neutron diffraction, which mainly comprises a frame, an inner pressure cavity, pressing anvils, a sealing cushion and a loading system, wherein the inner pressure cavity is positioned in the frame and is formed by a pressure head and a cavity seat; the pressing anvils are positioned in the inner pressure cavity and are respectively arranged on the pressure head and the cavity seat; anvil surfaces of the two pressing anvils are opposite; the sealing cushion is positioned between the two pressing anvils; a sample high pressure sealing cavity is formed by the two pressing anvils and the sealing cushion positioned between the two pressing anvils; the inner pressure cavity is provided with a neutron beam incident light channel and a diffraction light window; the loading system is provided with two stages of loading subsystems; primary loading subsystems are screw thread pair mechanical loading systems which are symmetrically arranged in pairs; a secondary load subsystem is formed by an oil cylinder arranged on the frame and a piston acts on the inner pressure cavity; and the high pressure device is suspended below a suspension device matched with a neutron reactor source platform through the frame. The anvil cell high pressure device has good compatibility between the pressing anvils and can be used for carrying out loading pressure application on an experimental sample on an experiment table. The loading pressure can be kept for a long time. Experimenters can be far away from the experiment table to carry out experimental operation. The anvil cell high pressure device has high safety.

Description

technical field [0001] The invention relates to in-situ neutron diffraction experiment technology, more specifically relates to an in-situ neutron diffraction counter-anvil high-pressure device for measuring material structure and physical properties under ultra-high pressure. technical background [0002] In the field of high-pressure technology, the counter-anvil type high-pressure device is an instrument that can generate ultra-high pressure. The gasket between them and the loading mechanism on the inner pressure chamber are set, the upper and lower anvils and the gasket constitute a high-pressure chamber for placing the sample to be tested, and a pressure-transmitting medium is filled around the sample in the high-pressure chamber. The pressure transmission medium can be solid, liquid or gas. Among them, the gas pressure transmission medium has the advantages of complete hydrostatic pressure transmission characteristics, stable chemical properties and the ability to with...

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Problems solved by technology

[0004] Aiming at the deficiencies of the prior art in-situ neutron diffraction counter-anvil high-voltage device, the purpose of the present invention is to provide a new structure of the in-situ neutron diffraction counter-anvil high-voltage device to solve the problem of prior art in-situ A counter-anvil high-pressure device for neutron diffraction generally can only be used for an anvil made of one material, and cannot be used for real-time hydraulic loading of experimental samples on the test bench. It is difficult to ensure that the samples are preloaded. Experiments are carried out under pressure, which can easily lead to problems such as experiment failure

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