Special thermal insulation pressure device for testing diamond pressure cavity

Abstract

The invention discloses a special thermal insulation pressure device for testing a diamond pressure cavity, the special thermal insulation pressure device comprises an outer shell provided with a hollow chamber, wherein the diamond pressure cavity is arranged in the outer shell, an inner thermal insulation layer is wrapped between the diamond pressure cavity and the outer shell, and the inner thermal insulation layer is connected with an inner wall of the outer shell. If the device is applied to the test of the diamond pressure cavity under high temperature and high pressure, a relatively closed inner environment can be provided, an inert gas such as nitrogen, helium gas, is selected and injected at a fixed flow rate, the inert gas therein can reduce the oxidation risk of diamond, a highertemperature parameter can be set, if a DAC high temperature and high pressure test is performed by using the device, the test temperature can be further increased, and the test temperature and pressure can be accurately controlled so as to meet the requirements of an in-situ high temperature test, a microscopic test lens is not damaged, material properties and characteristics under extreme conditions can be obtained more accurately, furthermore, the integrity of the diamond to a top anvil structure can be protected, the cost is saved, and the scheme is simple in structure and high in maneuverability.

Description

technical field [0001] The invention belongs to the technical field of testing instruments, and in particular relates to a special heat-insulating and pressurizing device for diamond pressure chamber testing. Background technique [0002] In the prior art, high-temperature and high-pressure experimental research is an important way to obtain material properties and characteristics under extreme conditions combined with inversion analysis. Due to the small pressure surface area of ​​the diamond anvil and the tested sample in the diamond pressure chamber, the diamond pressure chamber The area of ​​the mechanical pressurization part is large, which can easily make the sample obtain a higher pressure, so the usual high temperature and high pressure test will use the diamond pressure chamber device to realize the high temperature test under static high pressure, and then the sample is quickly cooled and quenched to obtain the reaction product Research. [0003] Due to the needs ...

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Problems solved by technology

[0003] Due to the needs of high-temperature industry and experimental technology, the design and production of various soft thermal insulation covers and high-temperature protective sleeves are relatively mature, but insulation sleeves specially used for diamond pressure chamber testing are very rare, and the test equipment is easily damaged due to high-temperature experiments. , so in-situ experiments at higher temperatures cannot be performed using diamond pressure chambers in the prior art

[0004] The Chinese patent with the application number CN201510036364 discloses an internally cooled diamond counter-anvil press, and discloses a water-cooled cooling method in high-temperature experiments, which basically solves the problem of high-temperature damage to the press, but it still cannot The in-situ pressure control experiment design is carried out, and its water-cooling feature limits its maximum temperature, making it difficult to obtain a stable high temperature. The heating wire is fixed on the gasket with a high-temperature repair agent, which is difficult to install and use

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