Gleeble vacuum melting equipment device

Abstract

The utility model discloses a Gleeble vacuum melting equipment device, which comprises a Gleeble main machine with a pressure head and a vacuum chamber, a melting device and a clamping and fixing device are further arranged in the vacuum chamber, and the melting device is connected to the pressure head through the clamping and fixing device. According to the smelting equipment disclosed by the utility model, the Gleeble thermal simulation testing machine is fully utilized, and the alloy can be quickly and conveniently smelted and new technological parameters of alloy smelting can be explored by controlling temperature rise and temperature drop at different temperatures and speeds in an experiment process, so that the time is saved, and the waste of materials is also reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to metallurgical technical field, concretely relates to a Gleeble vacuum melting equipment device. BACKGROUND

[0002] With the rapid development of modern science and technology, especially in the field of aerospace, energy development and electronic industry, the quality of metal materials is put forward higher and higher requirement. Vacuum melting can effectively remove the gas and non-metallic inclusions in the alloy and improve the purity of the alloy, thereby reducing the alloy defects and improving the mechanical properties of the material. When developing new materials, after determining the composition of the material, it is often necessary to carry out rapid and small amount of melting to determine the performance index of the material, so as to timely adjust the research and development direction.

[0003] Therefore, in view of the above technical problems, it is necessary to provide a Gleeble vacuum melting equipment device, application and method.

[0004] The information disclosed in this background section is intended only to increase an understanding of the general background of the application, and should not be construed as admitting that the information constitutes prior art that is already known to those of ordinary skill in the art. SUMMARY

[0005] The utility model discloses a Gleeble vacuum melting equipment device.

[0006] In order to realize the above-mentioned purpose, the technical scheme provided by the utility model one specific embodiment is as follows:

[0007] The Gleeble vacuum melting equipment device comprises a Gleeble host with a pressure head and a vacuum chamber, and further comprises a melting device and a clamping and fixing device in the vacuum chamber, and the melting device is connected to the pressure head through the clamping and fixing device.

[0008] In one or more embodiments of the utility model, the melting device comprises a crucible, an electrode and an Hre resistance wire, the Hre resistance wire is arranged adjacent to the crucible for heating the raw material in the crucible, and the electrode is electrically connected to the Gleeble host to supply power to the Hre resistance wire.

[0009] In one or more embodiments of the utility model, the melting device further comprises a silicate cavity, and the inner cavity of the silicate cavity at least partially contains the crucible.

[0010] In one or more embodiments of the utility model, the Hre resistance wire is uniformly arranged on the inner wall of the crucible.

[0011] In one or more embodiments of the utility model, the Hre resistance wire is uniformly arranged on the inner wall of the crucible close to the bottom.

[0012] In one or more embodiments of the present application, the smelting device further comprises a temperature sensing device for detecting the temperature of the molten metal in the crucible in the working state.

[0013] In one or more embodiments of the present application, the temperature sensing device is selected from a thermocouple and a temperature sensor. The thermocouple is used to be communicatively connected to the host, thereby implementing temperature feedback to monitor the smelting state and control the heating working current, etc.

[0014] In one or more embodiments of the present application, the clamping and fixing device comprises a clamp and a driving device for limiting the action of the clamp. Preferably, the driving device is selected from a hydraulic device, a motor, etc.

[0015] Compared with the prior art, the Gleeble vacuum smelting device, application and method have the advantages of simple structure, convenient use, low cost, etc. By utilizing the existing Gleeble device conditions, the Gleeble vacuum smelting device, application and method can realize the preparation and smelting parameter optimization of a small amount of alloy in a fast and convenient manner, fully utilize the current heating, accurate temperature control (the maximum heating speed can reach 10000℃ / S -1 ), good vacuum condition (the vacuum degree can reach 5×10 -2 Pa), and different cooling rates can be realized through various cooling modes (furnace cooling, air cooling, air cooling and water cooling, and the maximum free cooling speed reaches 140℃ / S -1 ), without the need for complex devices and operations, simple and convenient, and obvious effect. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0017] Figure 1 It is a schematic view of the northeast isometric side of the Gleeble vacuum smelting device in an embodiment of the present application.

[0018] Figure 2 It is a schematic view of the Gleeble vacuum smelting device in an embodiment of the present application.

[0019] Figure 3 It is a cast state organization chart of embodiment 1 in an embodiment of the present application.

[0020] Figure 4The cast structure diagram of the embodiment 2 in the embodiment of the present application.

[0021] 1-crucible, 2-electrode, 3-silicate cavity, 4-Hre resistance wire, 5-clamping and fixing device. DETAILED DESCRIPTION

[0022] In order to make the person skilled in the art better understand the technical scheme in the present application, the technical scheme of the present application will be clearly and completely described below in combination with the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by the person skilled in the art without creative labor should belong to the protection scope of the present application.

[0023] As shown in the figure, the Gleeble vacuum melting device in the embodiment of the present application comprises a clamping and fixing device 5 matched with the pressure head of the Gleeble testing machine and a melting device. The melting device comprises a crucible 1 for loading samples, and of course, a silicate cavity 3 for heat preservation and insulation can also be used to be sleeved outside the crucible 1. The clamping and fixing device 5 such as a clamp can be nested at the chuck at both ends of the Gleeble to keep it fixed and realize good electric conduction access. The annular claw part of the clamp is nested with the outside of the melting device to realize clamping. At the same time, the clamp can be provided with an interface groove matched with the electrode 2 of the Hre resistance wire 4. The resistance wire 4 can be installed in the crucible 1 of the melting device and connected with the electrode 2 through the heat insulation equipment such as the silicate cavity 3 and the interface of the clamping and fixing device. The crucible 1 loaded with samples is placed in the silicate cavity 3, and one end of the thermocouple is fixed on the crucible 1, and the other end is connected with the temperature control device of the Gleeble testing machine. After the door is closed and the equipment is started, the melting can be started.

[0024] Preferably, one end of the clamp of the clamping and fixing device 5 is perfectly nested with the pressure head of the Gleeble, and the other end is nested with the outer sleeve of the melting device and keeps fixed and in good contact with the electrode.

[0025] Preferably, the Hre resistance wire is detachably arranged in the crucible and kept fixed after installation.

[0026] Preferably, the silicate cavity is made of other heat insulation and heat resistance materials such as silicate.

[0027] Preferably, the size of the crucible device is smaller than that of the silicate cavity, so that it can be placed in the cavity and kept a certain distance from the resistance wire.

[0028] Preferably, the crucible is made of quartz or other insulating and heat resistant materials.

[0029] Preferably, the Gleeble thermal simulation testing machine can realize high vacuum environment and more accurate control of smelting temperature and heating rate, and through the control of temperature and heating rate by Gleeble, better process parameters can be obtained to guide the process control in the subsequent large-scale production process.

[0030] An application method of a Gleeble thermal simulation testing machine vacuum smelting device, the method comprising the following steps:

[0031] Adjust the pressure head at both ends of the Gleeble to a suitable distance sufficient for the placement of the device, embed the clamping and fixing device into the pressure head at both ends and keep it fixed and in good contact.

[0032] Place the smelting device between the clamping and fixing devices in the groove and keep it fixed, and ensure that the electrode of the smelting device connected to the resistance wire and the interface of the clamping and fixing device are in good contact.

[0033] Connect the Gleeble thermocouple and the crucible to monitor the temperature change during smelting, then place the material to be smelted into the crucible, and then place the crucible into the smelting device and ensure that the crucible is fixed and has minimal contact with the resistance wire.

[0034] Close the Gleeble furnace door, perform vacuum pumping (inert gas can be used if needed), and set the heating rate and temperature of the resistance wire of the smelting device using the Gleeble through current control.

[0035] After the temperature is raised to the required temperature, keep the temperature constant, and after the metal to be smelted is completely melted, the chamber can be cooled in various ways (furnace cooling, air cooling, etc.) with a maximum cooling rate of 140℃ / S -1 , or go to vacuum and open the furnace door to take out the crucible and pour the metal liquid into a water-cooled copper mold, take out the sample after cooling, and complete the smelting.

[0036] As shown in Figure 1 and 2 , the resistance wire for heating is arranged in the crucible. Of course, the quartz crucible can also be in a fixed working state and have minimal contact with the resistance wire to prolong the service life of both.

[0037] Due to the technical advantages of the Gleeble thermal simulation testing machine, such as accurate control of temperature and heating rate and realization of vacuum environment, a device suitable for Gleeble for quickly and conveniently smelting a small amount of alloy sample is designed and developed.

[0038] The smelting is performed by using the device as shown in Figure 1 and 2 .

[0039] Example 1

[0040] For example, to prepare 50 grams of 5A90 aluminum-lithium alloy, the following procedure is used:

[0041] (1) Adjust the Gleeble's presser heads to the appropriate distance to accommodate the placement of the fixtures, insert the fixtures into the presser heads and secure them in place and in good contact.

[0042] (2) Using the hydraulic drive, bring the left fixture into contact with the left face of the melting apparatus and secure the melting apparatus to the right fixture. Place the melting apparatus in the recess between the fixtures and secure it in place, ensuring that the melting apparatus' two electrodes connected to the resistance wire are in good contact with the fixtures' interfaces.

[0043] (3) Connect the Gleeble's thermocouple to the quartz crucible to monitor the melting temperature, and place the materials to be melted (99.9% pure aluminum, pure magnesium, pure copper, Al-10Zr, and refiner) into the quartz crucible, then place the crucible into the melting apparatus.

[0044] (4) Close the Gleeble's furnace door, use the Gleeble to control the heating rate and temperature of the melting apparatus' resistance wire (according to the test plan: heat the aluminum alloy sample to 720°C at 10°C / min), and monitor the temperature in the Gleeble's chamber at all times to prevent damage to the machine.

[0045] (5) After the temperature reaches the desired temperature (720°C), hold it for a while, then open the furnace door and add the lithium block, perform inert gas (argon) refining, and then perform vacuum refining (5 x 10 -2 Pa) to remove impurities such as hydrogen, sodium, and potassium.

[0046] (6) After the aluminum liquid is uniformly dissolved, remove the vacuum, open the furnace door, remove the crucible, and remove the surface oxidation layer, then pour the aluminum liquid into a water-cooled copper mold, remove the sample after cooling, and complete the melting.

[0047] Example 2

[0048] For example, to prepare 50 grams of Al-Fe-Ni-Co-Cr high-entropy alloy, the following procedure is used:

[0049] (1) Adjust the Gleeble's presser heads to the appropriate distance to accommodate the placement of the fixtures, insert the fixtures into the presser heads and secure them in place and in good contact.

[0050] (2) Through the hydraulic drive device, the left clamping and fixing device is contacted with the left end surface of the melting device, and the melting device and the right clamping and fixing device are fixed firmly. The melting device is fixed in the groove between the clamping and fixing devices, and it is ensured that the two electrodes of the melting device connected with the resistance wire and the interfaces of the clamping and fixing devices are in good contact.

[0051] (3) The Gleeble thermocouple is connected with the quartz crucible to monitor the change of the melting temperature, the material (pure aluminum, pure iron, pure nickel, pure cobalt and pure chromium with a purity of 99.9%) to be melted is placed into the quartz crucible, and then the crucible is placed into the melting device.

[0052] (4) The Gleeble furnace door is closed, vacuumization (up to 5*10 -2 Pa) and argon filling are performed, the Gleeble is used to control the temperature rising rate and temperature of the resistance wire of the melting device (according to the formulated test scheme: the high-entropy alloy sample is heated at 10℃ / min, and different temperatures can be tried to select the optimal dissolution temperature) and the temperature in the Gleeble cavity is monitored in real time to avoid damaging the machine.

[0053] (5) After the temperature is raised to the temperature at which the metal starts to dissolve, the temperature is kept constant, and after the melted metal is completely dissolved, the temperature is cooled to solid state. In order to improve the uniformity of the material, the melting is repeated 5 times, then the vacuum is opened, the furnace door is opened, the crucible is taken out, the surface oxide layer is removed, and the metal liquid is poured into a water-cooled copper mold. After cooling, the sample is taken out, and the melting is completed.

[0054] According to the metallographic structure observation of Figure 3 and Figure 4 , the primary phase distribution of the two alloys is uniform, and there is no obvious defect, and the melting quality is good. In summary, after the melting is completed, the temperature, temperature rising rate, holding time and vacuum degree in the melting process can be collected by the Gleeble, and the microstructure under different parameters can be observed by using a microscope. By analyzing these parameters, the optimal melting process of different metals is explored.

[0055] It is obvious to those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application.

[0056] Furthermore, it should be understood that although the specification is described in terms of embodiments, not every embodiment includes every feature or implementation described herein. The specification can include implicit combinations of explicitly mentioned features and / or implicit combinations of implicitly mentioned features. Such combinations are also expressly included within the scope of the specification and an embodiment.

Claims

1. A Gleeble vacuum melting apparatus, comprising a Gleeble main unit having a pressure head and a vacuum chamber, characterized in that, The vacuum chamber also includes a melting device and a clamping and fixing device, the melting device being connected to the pressure head via the clamping and fixing device.

2. The Gleeble vacuum melting apparatus according to claim 1, characterized in that, The smelting apparatus includes a crucible, electrodes, and Hre resistance wires. The Hre resistance wires are disposed adjacent to the crucible for heating the raw materials inside. The electrodes are electrically connected to the Gleeble host to supply power to the Hre resistance wires.

3. The Gleeble vacuum melting apparatus according to claim 2, characterized in that, The melting apparatus further includes a silicate chamber, the inner cavity of which at least partially accommodates the crucible.

4. The Gleeble vacuum melting apparatus according to claim 2, characterized in that, The Hre resistance wires are evenly distributed on the inner wall of the crucible.

5. The Gleeble vacuum melting apparatus according to claim 4, characterized in that, The Hre resistance wires are evenly distributed on the inner wall of the crucible near the bottom.

6. The Gleeble vacuum melting apparatus according to any one of claims 2-5, characterized in that, The smelting apparatus also includes a temperature sensing device, which is used to detect the temperature of the molten metal in the crucible during operation.

7. The Gleeble vacuum melting apparatus according to claim 6, characterized in that, The temperature sensing device is selected from thermocouples and temperature sensors.

8. The Gleeble vacuum melting apparatus according to claim 1, characterized in that, The clamping and fixing device includes a clamp and a drive device for limiting the movement of the clamp.

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