High-temperature liquid drop contact angle testing device and testing method

Abstract

The invention discloses a high-temperature liquid drop contact angle testing device and method. The high-temperature liquid drop contact angle testing device comprises a reactor, a dripping device, a camera device and a computer electrically connected with the camera device. The reactor is provided with a first hollow cavity, the bottom is provided with a substrate, and the upper end of the reactor is provided with an opening for the substrate to extend into the first hollow cavity; a first heater for heating the substrate is arranged at the bottom of the reactor; the dripping device is arranged at the upper end of the reactor and seals the opening, the dripping device is provided with a second hollow cavity, and a melt and an extrusion mechanism used for extruding the melt to break an oxide layer on the surface of the melt and separate liquid drops from the melt are arranged in the second hollow cavity; a through hole for dripping liquid drops is formed in the bottom of the dripping device, and the through hole is communicated with the opening; and a second heater for heating the melt is arranged at the top of the dripping device. Therefore, through the mode that the extrusion mechanism is matched with the dripping through hole, an oxidation film on the surface of the melt in the dripping process is broken and removed, so that the surface of a liquid drop at the moment of contact with the substrate is pure, and obtained data are more accurate.

Description

technical field [0001] The invention relates to the field of contact angle testing, and more precisely, relates to a high-temperature liquid drop contact angle testing device and a testing method. Background technique [0002] Wetting phenomenon is very common in real life and scientific research. For example, in the hot-dip galvanizing process, the wettability of the zinc liquid and the substrate seriously affects the quality of the coating; in the welding process, the quality of the weld is closely related to the wettability of the solder and the substrate; The wettability with the ceramic determines the properties of the composite. [0003] The wettability is usually indicated by the contact angle. The methods of measuring contact angle mainly include: pendant drop method, sessile drop method and so on. The traditional sessile drop method is to heat the metal and the substrate together to a specified temperature. After the metal is completely melted, record the contact...

AI Technical Summary

Problems solved by technology

Although this method can obtain the contact angle data between the metal melt and the substrate, there are the following problems: 1) During the heating process, the melt will react with the substrate, which seriously affects the accuracy of the contact angle during the spreading process; During the process, an oxide film will be formed on the surface of the sample, so the obtained contact angle data cannot truly reflect the wettability of the melt and the substrate; 3) Only one set of experimental data can be obtained each time the experiment is performed, which affects the progress of the experiment

[0004] CN110631966B, CN106018184A, etc. have solved the first problem by using the drop method, but failed to solve the second and third problems

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