Method and device for determining material solid/liquid interfacial energy by experiment

Abstract

The invention relates to a method and a device for determining material solid / liquid interfacial energy by experiment, and belongs to the field of solidification technology in material preparation. The invention is characterized by comprising the following steps that: A, a metal ingot is cut into a cylindrical bar with a proper size through a wire cutting machine; the cylindrical bar is cleaned up and dried by a blow drier; the dried cylindrical bar is placed into a suited alundum tube and is fixed on a draw bar; the draw bar with the dried cylindrical bar as a sample, a cooling tank and a servo motor are assembled well; and a position of the sample in a heating system is adjusted by the draw bar and it is ensured that a part of the sample bar is melted well; B, argon as protective gas isfed into the heating system; after 20 minutes, the heating system is started, when a temperature in a furnace of the heating system rises to an objective temperature, the temperature in the furnace is kept for a period of time to ensure the stabilization of heat flow in the furnace; C, a metal globular solid which is congener with the sample is placed on the surface of the molten sample from the upper portion of the device; when the surface of the metal globular solid is infiltrated with the molten sample, a servo drawing system is started; the sample is pulled down fast and enters into the cooling tank to be quenched and thus a feature of a solid / liquid interface is maintained; and a contact angle value is obtained by a direct measure and is substituted into an interfacial tension balance formula and interfacial energy is calculated out by the formula. The present device realizes a core idea that a feature of a solid / liquid interface of a sample at a high temperature is maintained byfast quenching.

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...

AI Technical Summary

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.

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