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Tungsten-based neutron transparent material of neutron diffraction high-pressure cavity and preparation method thereof

A transparent material, high-pressure cavity technology, applied in the field of neutron diffraction, can solve the problems of low strength, inability to support high pressure, diamond anvil damage, etc., to achieve the effects of high hardness, prolonged service life, and increased pressure

Inactive Publication Date: 2015-05-06
INST OF FLUID PHYSICS CHINA ACAD OF ENG PHYSICS +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Studies have shown that the strength of Ti-Zr alloy as a gasket for high-pressure neutron diffraction is too low under high pressure to support high pressure. Under high pressure, the thickness becomes very thin, and the number of samples that can accommodate neutrons is very small. Diffraction brings difficulties, and the Ti-Zr alloy has strong adhesion, which is easy to adhere to the diamond table, which is extremely difficult to clean, and even causes damage to the diamond anvil
Although stainless steel gaskets have higher strength and anti-adhesion performance, stainless steel has a strong absorption of neutrons, which makes the detected neutron diffraction intensity lower

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A neutron-transparent material for neutron-diffraction high-pressure cavity gaskets, the content of tungsten in the neutron-transparent material is 68wt%, and the content of titanium is 32wt%. The preparation method of this material adopts the powder metallurgy process, mixes tungsten powder and titanium powder according to the stated ratio, ball mills and mixes them evenly, steel mold pressing or cold isostatic pressing, and then vacuum sintering at 1400°C for 2 hours.

Embodiment 2

[0020] A neutron-transparent material for neutron-diffraction high-pressure chamber gaskets. The content of tungsten in the neutron-transparent material is 78wt%, and the content of titanium is 22wt%. The preparation method of this material adopts powder metallurgy process, which combines tungsten powder and titanium hydride (TiH 2 ) powder according to the stated ratio, ball milled and mixed evenly, steel mold pressing or cold isostatic pressing, and then vacuum sintering at 140°C for 2.5h.

Embodiment 3

[0022] A neutron-transparent material for neutron-diffraction high-pressure chamber gaskets. The content of tungsten in the neutron-transparent material is 73wt%, and the content of titanium is 27wt%. The preparation method of this material adopts the powder metallurgy process, mixes tungsten powder and manganese powder according to the stated ratio, ball mills and mixes them evenly, steel mold pressing or cold isostatic pressing, and then vacuum sintering at 1600°C for 3 hours.

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Abstract

The invention relates to a tungsten-based neutron transparent material of a neutron diffraction high-pressure cavity and a preparation method thereof. The tungsten-based neutron transparent material comprises 68-78wt% of tungsten and the balance any one of titanium and manganese, or one or two of titanium hydride powder and manganese powder. Compared with the existing Ti-Zr alloy or stainless steel seal pad, the high-pressure cavity seal pad material has high hardness, large strength, high coherent scattering transparency and low adhesiveness, prolongs a service life of a diamond anvil cell and improves pressure in the high-pressure cavity.

Description

technical field [0001] The invention belongs to the technical field of neutron diffraction, and in particular relates to an alloy material used for a gasket of a neutron diffraction high-pressure cavity and a preparation method thereof. Background technique [0002] High-pressure science has developed into a new dimension of material science, providing unprecedented opportunities for cutting-edge scientific explorations such as exploring new substances, discovering new laws and new theories. Although neutron diffraction is extremely important in studying the properties of materials at high pressure, however, this technique has lagged far behind other high-pressure techniques, such as synchrotron radiation high-pressure technology. The gasket of the high-pressure chamber is used to fix the sample and increase the confining pressure. At the same time, the incident (or outgoing) light diffracted by neutrons will pass through the gasket, which requires the gasket to have high co...

Claims

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Application Information

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IPC IPC(8): C22C27/04C22C1/04
Inventor 毕延吴强候琪玥林涛金钟铃韩松柏陈东风谢鸿森徐济安
Owner INST OF FLUID PHYSICS CHINA ACAD OF ENG PHYSICS
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