Dripping method wetting measurement device for high-temperature metal

Abstract

The utility model relates to the technical field of material processing and manufacturing, and provides a dripping method wetting measuring device for high-temperature metal, which comprises a furnace body, an induction heating power supply, a temperature control device, an infrared thermometer and a contact angle measuring system, a quartz crucible, a crucible clamping device, a substrate and a substrate heating device are also arranged in the furnace body; the furnace body is provided with a gas path pipeline, a plurality of gas inlets and outlets and a plurality of glass observation holes; the gas path pipeline extends into the furnace body from the outside of the furnace body and is communicated with the quartz crucible; the infrared thermometer is arranged outside the furnace body and right faces the glass observation hole and the substrate. And the temperature control device is electrically connected with the infrared temperature measuring instrument. The metal melt wettability testing device adopts a dripping method to test the influence of different matrix materials, different matrix surface states and different matrix temperatures on the metal melt wettability, and has the characteristics of simplicity, low cost, convenience in clamping, high applicability and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of material processing and manufacturing, and particularly relates to a wetting measurement device for high-temperature metals using a dripping method. Background Art

[0002] Wetting and heat conduction are two key processes in the solidification of molten metal on a cold substrate. Interfacial heat transfer plays a decisive role in the solidified structure and surface quality. Wetting is a fundamental factor influencing interfacial heat transfer. Poor wettability leads to insufficient cooling capacity and poor banding. Common experimental methods for studying the wetting behavior of molten metal on substrate surfaces include the sessile drop method and the dripping method. In addition, immersion techniques can be used to study the transient heat transfer behavior between the molten metal and the substrate. Experimental setups include: sessile drop wetting measurement apparatus, dripping wetting measurement apparatus, and immersion heat transfer measurement apparatus.

[0003] The sessile drop method involves placing a metal on the surface of a copper substrate. Both are heated to a set temperature. The contact angle and surface energy of the naturally formed metal droplet on the substrate are then measured. Changes in the contact angle over time and melt temperature can also be determined, making it widely used in testing the wettability of molten metals. However, in the sessile drop method, the metal and substrate are heated together, and the substrate must remain unchanged at all times. Therefore, the sessile drop method is only applicable when the metal melting point is lower than that of the substrate. The dripping method typically involves melting the metal and dropping it directly onto the substrate, observing the spreading changes of the molten metal in a very short period of time after contact with the substrate. This method is suitable for studying the wetting and heat transfer processes of liquid metal during rapid solidification on crystallization rollers in thin strip continuous casting. The dripping method can simultaneously measure the wetting angle and heat flux between the molten metal and the copper substrate, but it cannot simulate the effects of varying substrate temperatures on the wettability of the molten metal. An immersion heat transfer measurement device simulates the contact process between molten steel and a substrate during the continuous strip casting process. A copper substrate is vertically immersed in molten steel in a vacuum induction furnace. Sub-rapid solidification is achieved by surface cooling. The interfacial heat flow is measured by collecting temperature signals from thermocouples soldered into the copper substrate. While this device can measure the heat transfer capacity between the molten metal and the copper substrate, it cannot measure wettability parameters such as the contact angle.

[0004] In summary, existing experimental methods and apparatus for studying the wetting and heat transfer behavior of molten metal on substrate surfaces vary in their applicability and test content, and the equipment is expensive. Therefore, a measurement device is needed to study the effects of different substrate materials, surface conditions, and temperatures on the wettability of molten metal. Utility Model Content

[0005] In response to the above-mentioned problems in the prior art, this application proposes a dripping method wettability measurement device for high-temperature metals. The dripping method is used to test the effects of different substrate materials, different substrate surface conditions and different substrate temperatures on the wettability of metal melts. The device has the characteristics of simple device, low cost, easy clamping and strong applicability.

[0006] The utility model proposes a dripping method wetting measurement device for high-temperature metal, comprising: a furnace body, an induction heating power supply, a temperature control device, an infrared thermometer, and a contact angle measurement system; the induction heating power supply includes an induction heating coil arranged in the furnace body; a quartz crucible, a crucible clamping device, a substrate, and a substrate heating device are also arranged in the furnace body; the furnace body is provided with a gas pipeline, multiple gas inlets and outlets, and multiple glass observation holes; the crucible clamping device clamps the quartz crucible in the induction heating coil; the substrate is located below the quartz crucible; the substrate heating device heats the substrate; the gas pipeline extends from the outside of the furnace body into the furnace body and is connected to the quartz crucible; the infrared thermometer is arranged outside the furnace body and is arranged opposite to the glass observation hole and the substrate; the temperature control device is electrically connected to the infrared thermometer and the induction heating coil; the contact angle measurement system is arranged outside the furnace body and is arranged opposite to the glass observation hole and the substrate.

[0007] Furthermore, the gas inlet and outlet include an air outlet, an air extraction port, a lower air inlet and an upper air inlet; the air outlet and the air extraction port are arranged on the same side of the furnace body, and the air outlet is located above the air extraction port; the air extraction port and the lower air inlet are relatively arranged on both sides of the furnace body.

[0008] Furthermore, the gas pipeline includes an external gas pipe and an internal gas injection hose that are connected to each other; the external gas pipe is installed on the outside of the upper air inlet, one end of the internal gas injection hose is located on the inside of the upper air inlet, and the other end is connected to the quartz crucible.

[0009] Furthermore, the plurality of glass observation holes include a left observation hole, a right observation hole, a front observation hole, a rear oblique observation hole and an upper observation hole; the left observation hole and the right observation hole are relatively arranged on both sides of the furnace body.

[0010] Furthermore, the contact angle measurement system includes a light source, a CCD camera and a computer; the light source is arranged facing the left observation hole, the CCD camera is arranged facing the right observation hole, and is connected to the computer.

[0011] Furthermore, the infrared thermometer is arranged facing the rear oblique observation hole.

[0012] Furthermore, the quartz crucible is a transparent quartz tube.

[0013] Furthermore, the crucible clamping device includes a base, a vertical rod, a horizontal rod, a first clamp and a second clamp; the base is connected to the furnace body, the vertical rod is installed on the base, and the first clamp is clamped on the vertical rod; one end of the horizontal rod is connected to the first clamp, and the other end is connected to the second clamp; the second clamp clamps the quartz crucible.

[0014] Furthermore, the first clamp and the second clamp are both cross clamps.

[0015] Furthermore, the furnace body is also provided with an openable furnace door.

[0016] The beneficial effects of the present invention are as follows: a quartz crucible is clamped within the induction heating coil using a crucible clamping device disposed within the furnace, resulting in a simple structure and convenient securing of the quartz crucible. By disposing an infrared thermometer outside the furnace body, multiple gas inlets and outlets, and a glass observation port within the furnace body, and heating the substrate using a substrate heating device, the furnace environment can be freely switched between a vacuum state and various atmospheres, facilitating temperature measurement and observation of the wetting behavior of molten metal on substrate surfaces at different temperatures under different conditions. This device is useful for studying the effects of different substrate materials, substrate surface conditions, and substrate temperatures on the wettability of molten metal, and features simple equipment, low cost, convenient clamping, and strong applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the main structure of the dripping method wetting measurement device for high-temperature metals of the present invention.

[0018] Figure 2 This is a schematic top view of the structure of the dripping method wetting measurement device for high-temperature metals of the present invention.

[0019] Figure 3 Figure 1 Schematic diagram of the main structure of the middle crucible clamping device.

[0020] Figure 4 for Figure 3 Schematic diagram of the top view of the middle crucible clamping device.

[0021] In the figure, 1-air outlet; 2-exhaust port; 3-lower air inlet; 4-air pipe outside the furnace; 5-upper air inlet; 6-furnace body; 7-vacuum gauge; 8-upper observation hole; 9-crucible clamping device; 10-furnace air injection hose; 11-quartz crucible; 12-substrate; 13-substrate heating device; 14-rear oblique observation hole; 15-right observation hole; 16-front observation hole; 17-left observation hole; 18-induction heating coil; 19-infrared thermometer; 20-temperature control device; 91-base; 92-vertical rod; 93-first clamp; 94-horizontal rod; 95-second clamp; 97 / 98 / 99 / 910-fastening bolts. DETAILED DESCRIPTION

[0022] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0023] like Figure 1-Figure 4 The dripping method wetting measurement device for high-temperature metals shown includes: a furnace body 6, an induction heating power supply, a temperature control device 20, an infrared thermometer 19, and a contact angle measurement system.

[0024] The furnace body 6 is also provided with a quartz crucible 11, a crucible clamping device 9, a substrate 12, and a substrate heating device 13. The substrate 12 is placed on top of the substrate heating device 13. The furnace body 6 is also connected to a vacuum mechanical pump for communicating with the exhaust port 2 to extract the air from the furnace body 6.

[0025] The measuring method of the measuring device of this embodiment is as follows:

[0026] The quartz crucible 11 is fixed in the induction heating coil 18 by the crucible clamping device 9. The position of the infrared thermometer 19 is adjusted so that it is aligned with the solid metal block in the quartz crucible 11 through the rear oblique observation hole 14, and the furnace door is closed.

[0027] Connect a mechanical pump to exhaust port 2. Once the vacuum level in the furnace drops to approximately -0.1 MPa, stop exhausting. Power on substrate heating device 13, heating substrate 12 to the set temperature and then maintaining it. Next, open lower air inlet 3 to allow argon to enter the furnace. Once the pressure returns to equilibrium between the internal and external pressures, open outlet 1.

[0028] The temperature control system is set to a certain temperature. The induction heating power supply is turned on, energizing the induction heating coil 18. The metal block in the quartz crucible 11 rapidly melts, and the infrared thermometer 19 monitors the temperature of the metal block. The infrared thermometer 19 measures the metal melting temperature through the glass observation hole (i.e., the rear oblique observation hole 14) in the furnace body 6, and the temperature control device 20 stabilizes the melting temperature at the set temperature.

[0029] When the metal melts and reaches the set temperature, the upper air inlet 5 is opened, and a joint is installed on the upper part of the quartz crucible 11 to connect with the air injection hose 10 in the furnace, which is used to spray gas into the quartz crucible 11. Argon gas enters the quartz crucible 11 through the air injection hose 10 in the furnace, and blows the molten metal out from the small hole at the bottom of the quartz crucible 11, dripping onto the substrate 12 with different surface conditions and temperatures, and then quickly solidifies. The substrate heating device 13 is powered off and the argon gas is turned off.

[0030] The contact angle measurement system illuminates the furnace interior through left observation port 17, while a CCD camera captures the droplet's dripping process through right observation port 15. Computer-based contact angle measurement software calculates the dynamic change in contact angle and the final contact angle. The entire droplet's dripping process is captured by the contact angle measurement system, dynamically measuring the change in contact angle from the moment the droplet contacts the substrate 12 until solidification.

[0031] 6) After the contact angle measurement is completed, the furnace door is opened, the substrate 12 is taken out, and the furnace is cleaned.

[0032] The main technical parameters are as follows:

[0033] 1) The furnace body 6 is made of 304 stainless steel.

[0034] 2) Considering the high temperature resistance of the quartz crucible 11, the maximum heating temperature of the metal melt is 1700°C.

[0035] 3) Argon injection pressure of molten droplet: 0.01~0.06MPa.

[0036] 4) Maximum heating temperature of substrate 12: 300-400°C.

[0037] like Figure 3 、 Figure 4As shown, the crucible clamping device 9 includes a base 91, a vertical rod 92, a horizontal rod 94, a first clamp 93, and a second clamp 95. The base 91 is connected to the furnace body 6, the vertical rod 92 is mounted on the base 91, and the first clamp 93 is clamped on the vertical rod 92. One end of the horizontal rod 94 is connected to the first clamp 93, and the other end is connected to the second clamp 95. The second clamp 95 clamps the quartz crucible 11. The crucible clamping device 9 also includes multiple fastening bolts. Both the horizontal rod 94 and the vertical rod 92 are made of stainless steel. One end of the horizontal rod 94 is connected to the second clamp 95 via a fastening bolt 97. The second clamp 95 fastens and clamps the quartz crucible 11 via a fastening bolt 98. The first clamp 93 fastens and clamps the vertical rod 92 via a fastening bolt 99. The other end of the horizontal rod 94 is connected to the first clamp 93 via a fastening bolt 910. By loosening the fastening bolts 98, the second clamp 95 can be adjusted in relation to the quartz crucible 11. By loosening the fastening bolts 99, the height of the horizontal rod 94 can be adjusted, and the horizontal rod 94 can also be rotated about the vertical rod 92 to adjust the position of the quartz crucible 11. In some embodiments, the vertical rod 92 is provided with a scale line, and the first clamp 93 is provided with a pointer pointing to the scale line for marking the height of the horizontal rod 94. In some embodiments, an L-shaped suspension rod is provided at one end of the horizontal rod 94 near the vertical rod 92. The upper end of the suspension rod is connected to the second clamp 95, and the lower end is aligned with the lower end of the quartz crucible 11. The lower end of the suspension rod is provided with a pointer pointing to the scale line on the vertical rod 92 for quickly marking the height of the lower end of the quartz crucible 11. Furthermore, a distance is maintained between the suspension rod and the quartz crucible 11, and a portion of the induction heating coil 18 is positioned between the suspension rod and the quartz crucible 11.

[0038] The measurement device in this embodiment measures temperature using an infrared thermometer 19 connected to a temperature control device 20. This device, in turn, is connected to an induction heating power supply. This allows for accurate control of the superheat of the molten metal before it drips, a crucial parameter in wetting studies. The device utilizes a transparent quartz tube with multiple glass observation ports, allowing for convenient observation of the metal's melting state before it drips.

[0039] The above are only preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions based on the concept of the present invention are within the scope of protection of the present invention. It should be pointed out that for those skilled in the art, various improvements and modifications that do not depart from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A dripping method wetting measurement device for high temperature metal, characterized in that: include: A furnace body, an induction heating power supply, a temperature control device, an infrared thermometer, and a contact angle measurement system; the induction heating power supply includes an induction heating coil arranged in the furnace body; a quartz crucible, a crucible clamping device, a substrate, and a substrate heating device are also arranged in the furnace body; the furnace body is provided with a gas pipeline, multiple gas inlets and outlets, and multiple glass observation holes; the crucible clamping device clamps the quartz crucible in the induction heating coil; the substrate is located below the quartz crucible; the substrate heating device heats the substrate; the gas pipeline extends from the outside of the furnace body into the furnace body and is connected to the quartz crucible; the infrared thermometer is arranged outside the furnace body and is arranged opposite to the glass observation hole and the substrate; the temperature control device is electrically connected to the infrared thermometer and the induction heating coil; the contact angle measurement system is arranged outside the furnace body and is arranged opposite to the glass observation hole and the substrate.

2. The dripping method wetting measurement device for high temperature metal according to claim 1, characterized in that: The gas inlet and outlet include an air outlet, an air extraction port, a lower air inlet and an upper air inlet; the air outlet and the air extraction port are arranged on the same side of the furnace body, and the air outlet is located above the air extraction port; the air extraction port and the lower air inlet are arranged on both sides of the furnace body relative to each other.

3. The dripping method wetting measurement device for high temperature metal according to claim 2, characterized in that: The gas pipeline includes an external gas pipe and an internal gas injection hose that are connected to each other; the external gas pipe is installed on the outside of the upper air inlet, one end of the internal gas injection hose is located on the inside of the upper air inlet, and the other end is connected to the quartz crucible.

4. The dripping method wetting measurement device for high temperature metal according to claim 2, characterized in that: The plurality of glass observation holes include a left observation hole, a right observation hole, a front observation hole, a rear oblique observation hole and an upper observation hole; the left observation hole and the right observation hole are relatively arranged on both sides of the furnace body.

5. The dripping method wetting measurement device for high temperature metal according to claim 4, characterized in that: The contact angle measurement system includes a light source, a CCD camera and a computer; the light source is arranged facing the left observation hole, the CCD camera is arranged facing the right observation hole, and is connected to the computer.

6. The dripping method wetting measurement device for high temperature metal according to claim 4, characterized in that: The infrared thermometer is arranged facing the rear oblique observation hole.

7. The dripping method wetting measurement device for high temperature metal according to claim 1, characterized in that: The quartz crucible adopts a transparent quartz tube.

8. A dripping method wetting measurement device for high temperature metal according to any one of claims 1 to 7, characterized in that: The crucible clamping device includes a base, a vertical rod, a horizontal rod, a first clamp and a second clamp; the base is connected to the furnace body, the vertical rod is installed on the base, and the first clamp is clamped on the vertical rod; one end of the horizontal rod is connected to the first clamp, and the other end is connected to the second clamp; the second clamp clamps the quartz crucible.

9. The dripping method wetting measurement device for high temperature metal according to claim 8, characterized in that: The first clamp and the second clamp are both cross clamps.

10. The dripping method wetting measurement device for high temperature metal according to claim 1, characterized in that: The furnace body is also provided with an openable furnace door.

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