Method and device for determining material solid/liquid interfacial energy by experiment
A technology of liquid interface and interfacial energy, which is used in surface tension analysis and other directions
Inactive Publication Date: 2013-01-09
SHANGHAI UNIV
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Problems solved by technology
Due to the high temperature characteristics of the solidification process and the limitation of measurement methods, there is no direct experimental method to measure the solid / liquid interface energy during the solidification process of the same material.
Method used
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Embodiment 1
[0027] Cut the aluminum ingots into Φ16×100mm cylindrical rods with a wire cutting machine, clean them and dry them with a hair dryer, put them into corundum tubes 8 with an inner diameter of Φ16mm, and fix them on the tie rods. Assemble the pull rod 12 with the sample, the cooling pool 5 with the liquid metal Ga-In-Sn and the servo motor 13, and adjust the position of the sample in the heating system through the pull rod 12. First pass the argon gas protection, start the heating system after about 20 minutes, set the parameters of the temperature control system 6: the target temperature is (660+10) ℃, the heating time is 40 minutes, and the holding time is 20 minutes to ensure the heat flow in the furnace is stable. Place the prepared Φ4mm spherical solid aluminum on the surface of the aluminum melt from above the device, wait for the solid surface and the melt to infiltrate each other, then turn on the servo motor 13, and pull the sample into the cooling pool at a speed o...
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The invention relates to a method and a device for experimentally measuring the solid / liquid interface energy in the solidification process of materials, and belongs to the technical field of solidification in material preparation. Features of the present invention: cut the metal ingots into cylindrical rods of appropriate size with a wire cutting machine, clean them and dry them with a hair dryer, then put them into matching corundum tubes and fix them on the pull rods. Assemble the pull rod with the sample, the cooling pool and the servo motor, and adjust the position of the sample in the heating system through the pull rod to ensure that the upper part of the sample rod can be completely melted. Protect the furnace with argon gas, start the heating system after about 20 minutes, and keep it warm for a period of time after the temperature in the furnace rises to the target temperature to ensure the stability of the heat flow in the furnace. Place the prepared spherical solid of the same metal on the surface of the metal melt from above the device, wait for the solid surface and the melt to infiltrate each other, then turn on the servo pulling system, quickly pull the sample down to the cooling pool for quenching, and retain the solid morphology of the liquid / liquid interface. Finally, the contact angle value was obtained by direct measurement, and substituted into the balance formula of interfacial tension to calculate the interfacial energy. The device realizes the core idea that rapid quenching can preserve the morphology of the solid / liquid interface of the sample at high temperature.
Description
technical field [0001] The invention relates to a method and device for experimentally measuring the solid / liquid interface energy in the solidification process of materials. The method adopts rapid quenching liquid-solid coexistence body, retains the shape of the solid / liquid interface, and is conducive to direct measurement at room temperature to obtain contact Angle value, and then calculate the interfacial tension based on the interfacial tension balance formula. The invention belongs to the technical field of solidification in material preparation. Background technique [0002] Tension acts on the interface between phases. From a thermodynamic point of view, this tension is an excess energy possessed by the interface, called "interface energy". The solid-liquid interface energy plays an important role in the solidification process of materials. On the one hand, it is a part of the free energy in the liquid-solid transition. The smaller the interface energy, the smalle...
Claims
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IPC IPC(8): G01N13/02
Inventor 任维丽袁广宙任忠鸣邓康钟云波
Owner SHANGHAI UNIV