Apparatus and method for determining high temperature wettability

Abstract

The invention discloses an apparatus and a method for determining high temperature wettability. The apparatus comprises a heater body, a heating portion, an extruding dripping portion, a sample supporting portion and an image acquisition and processing portion. The heater body is comprised of a stainless steel cavity, a furnace lid and a No. 3 fluorine rubber ring bolt connecting together. A shielding layer in the heating portion is arranged in the center of a furnace bottom in the heater body, and a heating member is placed at the center of the shielding layer. The extruding dripping portion is perpendicularly arranged on an upper end of the heater body, and a lower end of a thermocouple in the heating portion, a lower end of the extruding dripping portion and an upper end of a sample bench are placed in the heater body. A substrate is placed at top of the sample bench. Two sets of CCD digital cameras or CMOS high speed cameras in the image acquisition and processing portion and a light source are respectively placed at the front and rear and the left and right of the heater body, and are in a same horizontal line with a symmetric axis of a quartz glass observation window, a wall through hole on the shielding layer and a heating member through hole on the heating member. The invention also provides a method for determining high temperature wettability.

Description

technical field [0001] The invention relates to the technical field of testing the wettability of metal droplets. More precisely, the invention relates to a device and method for measuring high-temperature wettability by extruding a metal melt to form a sessile drop. Background technique [0002] Wetting phenomena are ubiquitous in materials science. For example, in the preparation process of metal-ceramic composite materials, the wettability between metal and ceramic plays a key role in achieving the ideal interface bonding strength and interface structure of the product; the wetting of the solder to the substrate in the active brazing process is the key factor The first premise to realize the connection; the wettability between the mold and the molten metal in the casting process is closely related to the shape integrity of the casting; the wettability between the binder and the ceramic phase in powder metallurgy directly affects the part's Density and strength. [0003]...

AI Technical Summary

Problems solved by technology

[0004] One is that during the heating process, the metal sample is easily oxidized, so that the measured contact angle cannot truly reflect the wettability of the metal droplet and the substrate

[0005] The second is that the metal and the substrate are heated in contact. The pre-reaction between the two and the contamination of the substrate make it difficult to determine the initial contact angle of the system and the spreading kinetics of the droplet under isothermal conditions.

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