Novel principle and method for measuring diffusion coefficient of hydrogen in metal melt

A metal melt and diffusion coefficient technology, applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve problems such as complicated operation and difficulty in obtaining hydrogen diffusion coefficient

Inactive Publication Date: 2013-10-30
TSINGHUA UNIV
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Problems solved by technology

[0005] The object of the present invention is to provide a principle and method for obtaining the diffusion coefficient of hydrogen in the metal melt by using the solidification transformation of the hydrogen-soluble metal melt, so as to so

Method used

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  • Novel principle and method for measuring diffusion coefficient of hydrogen in metal melt
  • Novel principle and method for measuring diffusion coefficient of hydrogen in metal melt
  • Novel principle and method for measuring diffusion coefficient of hydrogen in metal melt

Examples

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Embodiment

[0040] (1) Prepare a metallic copper sample with a certain thickness of initially solidified non-bubble layer

[0041] Put a certain quality of pure copper (99.99%) into the crucible down-moving vacuum induction melting furnace and vacuumize. Heat the copper material to about 1400K (overheating 50K), fill it with 1×10 5 Pa hydrogen and 5×10 5 Argon gas of Pa, after holding for a period of time, put the crucible in contact with the water-cooled copper bottom to achieve directional solidification, and then cool down and take samples. Use the wire cutting method to cut the sample along the longitudinal section, and measure the initial bubble-free layer thickness L of the porous copper sample to be about 5mm, as shown in the attached image 3 shown.

[0042] (2) Calculate the diffusion coefficient of hydrogen near the melting point of metallic copper

[0043] Calculate the initial hydrogen concentration in the melt:

[0044] C 0 ...

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Abstract

The invention relates to a principle and method for measuring a diffusion coefficient of hydrogen nearby melting point temperature of a metal melt by utilizing solubility difference of the hydrogen in a metal liquid/solid phase and supersaturation conditions required by bubble nucleation. The method comprises the following steps of: by using a directional solidification device, melting metal in mixed gas of the hydrogen and argon at a certain pressure, so as to obtain an initial bubble-free layer with a certain thickness by utilizing directional hydrogen diffusion caused by the solubility difference of the hydrogen in the metal liquid/solid phase and the supersaturation conditions required by the bubble nucleation; combining the height of the bubble-free layer, the supersaturation conditions required by the nucleation and a nearly balance solidification principle of a single-phase alloy, so as to obtain the diffusion coefficient of the hydrogen nearby melting point temperature of the metal melt. The problems that the operation is complex and the diffusion coefficient of the hydrogen in a high-melting point metal melt is difficultly obtained by using the conventional method are solved, and the invention provides a principle and a method for simply and conveniently measuring the diffusion coefficient of the hydrogen nearby the melting point of the metal melt.

Description

technical field [0001] The present invention relates to a new principle and method for measuring the diffusion coefficient of hydrogen in a molten metal, in particular to a method for measuring the diffusion coefficient of hydrogen near the melting point temperature in a molten metal that does not react with it and has a relatively large solubility therein principles and methods. Background technique [0002] There is a close relationship between gas diffusion and the preparation, processing and performance of metals and alloys, and the diffusion coefficient changes with crystal structure, atomic size, alloy composition, temperature, etc. The study of gas diffusion is of great significance in many fields such as materials science, metallurgical chemistry and fluid physics. Hydrogen is the most easily diffused element into metals and alloys, and hydrogen energy is considered to be the most potential clean energy in the 21st century. In this context, scientists from various ...

Claims

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Application Information

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IPC IPC(8): G01N13/00
Inventor 刘源杨倩倩李言祥
Owner TSINGHUA UNIV
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