Multistage vacuum thermal degassing device for powder

Abstract

The utility model relates to the technical field of material processing equipment, in particular to a multi-stage vacuum thermal degassing device for powder. The device comprises a powder feeding tank, a preheating chamber, a thermal dynamic degassing chamber, a sheath, a first vacuum unit, a second vacuum unit, a sheath heating furnace and a vibration table. The first vacuum unit is respectively connected with the preheating chamber and the thermal dynamic degassing chamber; the second vacuum unit is connected with the sheath; the sheath is positioned in a hearth of the sheath heating furnace; and the sheath is fixed on the vibration table through a sheath tool. According to the powder multistage vacuum thermal degassing device, multistage degassing combination of three working procedures of preheating degassing of the preheating chamber, thermal dynamic degassing of the thermal dynamic degassing chamber and quasi-static degassing in the sheath is achieved, the three working procedures complete degassing under vacuum, the working procedures are coherent, the stability is high, and the efficiency is high. And the obtained metal powder meets the processing requirements of high-quality powder workpieces with low oxygen content and high tap density.

Description

Technical Field

[0001] The present application relates to the technical field of material processing equipment, and in particular to a powder multi-stage vacuum thermal degassing device. Background Art

[0002] The turbine disk of an aircraft engine is a core part that determines the overall performance of the engine. With the increase of the thrust-to-weight ratio of aircraft engines, the temperature before the turbine is getting higher and higher, and the requirements for the turbine disk are becoming more and more stringent. The main purpose of preparing high-quality metal powder alloy blanks is to manufacture high-performance aircraft engine turbine disks, guide plates, casings, etc. The basic process of more advanced metal powder parts is to melt and atomize the master alloy that has been smelted and meets the chemical composition requirements to form metal powder particles. The metal powder particles are screened, packaged, shaken, vacuumed and degassed, and then hot isostatically pressed into blanks. During the production process of metal powder parts, the metal powder inevitably comes into contact with the surrounding environment medium, resulting in an increase in oxygen content. The increase in the oxygen content of the metal powder will lead to the formation of primary particle boundary defects (PPBs), which will have an adverse effect on the mechanical properties of the final part. Therefore, the preparation of hot isostatically pressed metal powder parts with high density and low oxygen content must undergo appropriate degassing treatment to remove the gas adsorbed by the powder and improve the mechanical properties of the alloy, so as to meet the service requirements of the parts. Therefore, the metal powder thermal degassing process is crucial for quality control and process optimization of the preparation process of high-quality metal powder parts.

[0003] At present, the existing equipment mostly adopts thermal static degassing, that is, the powder is vibrated while being loaded in the atmosphere, so that the powder is vibrated in the package, and then the package is heated to a certain temperature and then evacuated. Or thermal dynamic degassing is adopted, that is, the powder is heated to a certain temperature in a vacuum environment, and then the powder is vibrated while being loaded, so that the metal powder is vibrated in the package. These methods have a good effect on removing the gas in the environment of the package, but the effect of removing the gas and moisture adsorbed by the powder itself is not good. If the powder still adsorbs a lot of gas and moisture in the process before the package, the powder usually accumulates in the package and its own gas is not conducive to removal, so that the degassing effect of the metal powder is not ideal, and ultimately the oxygen content of the powder product is high. Utility Model Content

[0004] The purpose of this application is to provide a powder multi-stage vacuum thermal degassing device to solve the technical problem that the degassing effect of metal powder in the existing technology or equipment is not ideal, which ultimately leads to a high oxygen increment of the powder parts, and ultimately ensures the preparation of high-quality metal powder alloy parts.

[0005] The powder multi-stage vacuum thermal degassing device provided in the embodiment of the present application comprises:

[0006] The lower powder tank, preheating chamber, thermal dynamic degassing chamber and bag jacket are connected in sequence from top to bottom;

[0007] A first vacuum unit is connected to the preheating chamber and the thermal dynamic degassing chamber respectively;

[0008] A second vacuum unit connected to the bag;

[0009] A jacket heating furnace, wherein the jacket is located in a furnace of the jacket heating furnace;

[0010] A vibration table, wherein the package is fixed on the vibration table by a package tool.

[0011] Furthermore, the lower powder tank is connected to the preheating chamber through a first pipeline, the preheating chamber is connected to the thermal dynamic degassing chamber through a second pipeline, and the thermal dynamic degassing chamber is connected to the sleeve through a third pipeline, and the first pipeline, the second pipeline and the third pipeline are all provided with flow regulating valves.

[0012] Further, the second pipeline includes a first longitudinal section, a first transverse section and a second longitudinal section connected in sequence, a first bellows is arranged on the first longitudinal section, a second bellows is arranged on the second longitudinal section, the flow regulating valve includes a second flow regulating valve arranged on the first longitudinal section and a third flow regulating valve arranged on the second longitudinal section, the second flow regulating valve is located between the preheating chamber and the first bellows, and the third flow regulating valve is located between the second bellows and the thermal dynamic degassing chamber.

[0013] Furthermore, along the direction from the first longitudinal section to the second longitudinal section, the height of the first transverse section gradually decreases, and a first electromagnetic powder feeder is provided on the first transverse section.

[0014] Furthermore, the upper end of the second longitudinal section is connected to a first material level detection device.

[0015] Further, the third pipeline includes a third longitudinal section, a second transverse section and a fourth longitudinal section connected in sequence, a third bellows is provided on the third longitudinal section, a fourth bellows is provided on the fourth longitudinal section, the flow regulating valve includes a fourth flow regulating valve provided on the third longitudinal section and a fifth flow regulating valve provided on the fourth longitudinal section, the fourth flow regulating valve is located between the thermal dynamic degassing chamber and the third bellows, and the fifth flow regulating valve is located between the fourth bellows and the sleeve.

[0016] Furthermore, along the direction from the third longitudinal section to the fourth longitudinal section, the height of the second transverse section gradually decreases, and a second electromagnetic powder feeder is provided on the second transverse section.

[0017] Furthermore, the upper end of the fourth longitudinal section is connected to a second material level detection device.

[0018] Furthermore, a weighing device is installed at the bottom of the lower powder tank, and the flow regulating valve includes a first flow regulating valve arranged on the first pipeline.

[0019] Furthermore, the preheating chamber and the thermal dynamic degassing chamber are both provided with vacuum detection instruments and temperature sensors.

[0020] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art:

[0021] The multi-stage vacuum thermal degassing device for powder provided in the embodiment of the present application improves the degassing efficiency and effect of metal powder, and meets the requirements of low gas content and high tap density of the powder package for subsequent powder sintering. The multi-stage vacuum thermal degassing device for metal powder realizes the multi-stage degassing combination of three processes: preheating degassing in the preheating chamber, thermal dynamic degassing in the thermal dynamic degassing chamber, and quasi-static degassing in the package, and all three processes are completed under vacuum. The process is coherent and highly stable. After using the multi-stage vacuum thermal degassing device for powder to degas nickel-based high-temperature alloy powder and titanium alloy powder, good degassing effects are obtained, and the obtained metal powder meets the processing requirements of high-quality powder parts with low oxygen content and high tap density. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0024] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0025] Figure 1 A schematic diagram of the structure of a multi-stage vacuum thermal degassing device for powders provided in an embodiment of the present application;

[0026] Figure 2 This is a flow chart of the working method of the powder multi-stage vacuum thermal degassing device provided in an embodiment of the present application.

[0027] Description of reference numerals:

[0028] 110, powder tank; 120, preheating chamber; 130, thermal dynamic degassing chamber; 140, bag; 150, first vacuum unit; 160, second vacuum unit; 170, bag heating furnace; 180, vibration table; 190, bag tooling;

[0029] 210, first pipeline; 220, second pipeline; 221, first longitudinal section; 222, first transverse section; 223, second longitudinal section; 224, first corrugated pipe; 225, second corrugated pipe; 230, third pipeline; 231, third longitudinal section; 232, second transverse section; 233, fourth longitudinal section; 234, third corrugated pipe; 235, fourth corrugated pipe; 240, fourth pipeline; 250, fifth pipeline; 260, sixth pipeline;

[0030] 310. Weighing device; 320. Vacuum detection instrument; 330. Temperature sensor.

[0031] 410, first flow regulating valve; 420, second flow regulating valve; 430, third flow regulating valve; 440, fourth flow regulating valve; 450, fifth flow regulating valve; 460, sixth flow regulating valve;

[0032] 510, a first electromagnetic powder feeder; 520, a second electromagnetic powder feeder;

[0033] 610. First material level detection device; 620. First material level detection device. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0035] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0036] For ease of description, spatial relative terms may be used herein to describe the relative positional relationship or movement of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", "front", "back", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure undergoes a position flip or a posture change or a motion state change, then these directional indications also change accordingly, for example: an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative descriptors used herein are interpreted accordingly.

[0037] See also Figure 1 As shown, the embodiment of the present application provides a powder multi-stage vacuum thermal degassing device, which includes a lower powder tank 110, a preheating chamber 120, a thermal dynamic degassing chamber 130, a jacket 140, a first vacuum unit 150, a second vacuum unit 160, a jacket heating furnace 170 and a vibration table 180. The lower powder tank 110, the preheating chamber 120, the thermal dynamic degassing chamber 130 and the jacket 140 are sequentially connected in a top-down arrangement in space; the first vacuum unit 150 is respectively connected to the preheating chamber 120 and the thermal dynamic degassing chamber 130; the second vacuum unit 160 is connected to the jacket 140; the jacket 140 is located in the furnace of the jacket heating furnace 170; and the jacket 140 is fixed on the vibration table 180 by the jacket tooling 190. The sleeve heating furnace 170 configured at the sleeve 140 is used to ensure the temperature required for degassing of the metal powder in the sleeve 140. The sleeve tooling 190 is a connecting structure used to fix the sleeve 140 on the vibration table 180. The sleeve 140 and part of the sleeve tooling 190 need to be in the furnace of the sleeve heating furnace 170. The vibration table 180 is used to provide vibration of specific frequency and amplitude.

[0038] The working process of the powder multi-stage vacuum thermal degassing device in the above embodiment is as follows: the first vacuum unit 150 and the second vacuum unit 160 are in operation, and the first vacuum unit 150 makes the vacuum degree of the preheating chamber 120 and the thermal dynamic degassing chamber 130 reach 5×10 -3 Pa, the second vacuum unit 160 makes the vacuum degree in the package 140 reach 5×10 -3Pa, and the heating systems of the preheating chamber 120, the thermal dynamic degassing chamber 130, and the jacket heating furnace 170 are all started to heat; then a certain mass of metal powder in the lower powder tank 110 is transported to the preheating chamber 120, and the metal powder is heated in the preheating chamber 120. In this process, the metal powder can be pre-degassed, so that part of the gas or moisture adsorbed in the metal powder is precipitated and released during the preheating process; then the metal powder in the preheating chamber 120 is transported to the thermal dynamic degassing chamber 130 at a certain flow rate, and the powder is thermally degassed during the falling process, so that the metal powder The adsorbed gas can be further released; at the same time, the metal powder falling to the bottom of the thermal dynamic degassing chamber 130 is also transported to the sleeve 140 at a certain flow rate, and the sleeve heating furnace 170 heats the sleeve 140 located in its furnace, so that the metal powder can continue to be degassed in the vacuum environment of the sleeve 140. During this period, the vibration table 180 works intermittently to increase the compaction density through vibration. At the same time, the metal powder accumulated in the sleeve 140 can be made relatively loose when the vibration table 180 is not vibrating, which is convenient for the metal powder to release the internal gas released during the vibration interval, so as to promote the complete degassing of the metal powder.

[0039] The embodiment of the present application provides a complete set of multi-stage vacuum thermal degassing devices for metal powders, which improves the degassing efficiency and effect of metal powders and meets the requirement of low gas content in the powder package 140 for subsequent powder sintering. The multi-stage vacuum thermal degassing device for metal powders realizes the multi-stage degassing combination of the three processes of preheating degassing in the preheating chamber 120, thermal dynamic degassing in the thermal dynamic degassing chamber 130, and quasi-static degassing in the package 140, and the three processes are all completed under vacuum. The processes are coherent and highly stable. After the multi-stage vacuum thermal degassing device for powders is used to degas nickel-based high-temperature alloy powders and titanium alloy powders, good degassing effects are obtained, and the metal powder obtained meets the processing requirements of high-quality powder parts with low oxygen content and high tap density.

[0040] In some embodiments, Figure 1As shown, the lower powder tank 110 is connected to the preheating chamber 120 through the first pipeline 210, the preheating chamber 120 is connected to the thermal dynamic degassing chamber 130 through the second pipeline 220, and the thermal dynamic degassing chamber 130 is connected to the jacket 140 through the third pipeline 230. Flow regulating valves are provided on the first pipeline 210, the second pipeline 220 and the third pipeline 230. On the one hand, each flow regulating valve can be used to adjust the flow of metal powder in the pipeline to achieve precise control; on the other hand, the powder multi-stage vacuum thermal degassing device can be separated into multiple units by opening and closing each flow regulating valve, and the vacuum degree of each unit can be adjusted separately according to needs through the first vacuum unit 150 and the second vacuum unit 160. For example, by closing the flow regulating valve on the first pipeline 210 and the flow regulating valve on the third pipeline 230 and opening the flow regulating valve on the second pipeline 220, the preheating chamber 120 and the thermal dynamic degassing chamber 130 can be evacuated simultaneously through the first vacuum unit 150, and the package 140 can be evacuated through the second vacuum unit 160. The first pipeline 210 is vertically arranged, one end of the first pipeline 210 is connected to the outlet at the bottom of the lower powder tank 110, and the other end of the first pipeline 210 is connected to the inlet at the top of the preheating chamber 120. The preheating chamber 120 is provided with a heating system for raising the temperature inside the preheating chamber 120 to the required temperature; one end of the second pipeline 220 is connected to the outlet at the bottom of the preheating chamber 120, and the other end of the second pipeline 220 is connected to the inlet at the top of the thermal dynamic degassing chamber 130. The thermal dynamic degassing chamber 130 is also provided with a heating system for heating the inside of the thermal dynamic degassing chamber 130 to the working temperature; one end of the third pipeline 230 is connected to the outlet at the bottom of the thermal dynamic degassing chamber 130, and the other end of the third pipeline 230 is connected to the inlet at the top of the sleeve 140.

[0041] like Figure 1 As shown, a weighing device 310 is installed at the bottom of the powder tank 110, and the flow regulating valve includes a first flow regulating valve 410 arranged on the first pipeline 210. The weighing module is used to monitor the weight change of the powder tank 110, and the first flow condition valve is used to control the flow of metal powder in the first pipeline 210. Through the cooperation of the first flow regulating valve 410 and the weighing module, the powder amount of the powder tank 110 can be controlled.

[0042] Optionally, the second pipeline 220 includes a first longitudinal section 221, a first transverse section 222, and a second longitudinal section 223 connected in sequence, a first bellows 224 is provided on the first longitudinal section 221, a second bellows 225 is provided on the second longitudinal section 223, and the flow regulating valve includes a second flow regulating valve 420 provided on the first longitudinal section 221 and a third flow regulating valve 430 provided on the second longitudinal section 223, the second flow regulating valve 420 is located between the preheating chamber 120 and the first bellows 224, and the third flow regulating valve 430 is located between the second bellows 225 and the thermal dynamic degassing chamber 130. Since the second pipeline 220 is also in a vacuum state during operation, the movement direction of the metal powder during the transportation process is adjusted by the first longitudinal section 221, the first transverse section 222, and the second longitudinal section 223 in different directions, so as to reduce the accumulation effect of the metal powder during the transportation process, so that the flow state of the metal powder in the second pipeline 220 changes, which can facilitate the precipitation and removal of the gas adsorbed on the metal powder. The arrangement of the first bellows 224 and the second bellows 225 can realize the detachable cooperation of the second pipeline 220, thereby realizing convenient detachable cooperation between the preheating chamber 120 and the thermal dynamic degassing chamber 130. In addition, since the vibration table 180 applies vibration to the package 140 intermittently, the vibration effect will inevitably be transmitted to other parts of the powder multi-stage vacuum thermal degassing device. The arrangement of the first bellows 224 and the second bellows 225 can achieve a vibration reduction effect, reducing the impact of the operation of the vibration table 180 on the overall equipment.

[0043] On the basis of the above-mentioned embodiment, along the direction from the first longitudinal section 221 to the second longitudinal section 223, the height of the first transverse section 222 is gradually reduced, and the first transverse section 222 is provided with a first electromagnetic powder feeder 510. The height of the metal powder gradually decreases during the flow through the first longitudinal section 221, the first transverse section 222 and the second longitudinal section 223 in sequence, so that the metal powder can fully rely on gravity during the transportation process of the second pipeline 220. The first electromagnetic powder feeder 510 is used to control the transportation flow rate of the metal powder and ensure that the powder is smoothly transported in the first transverse section 222. Preferably, the upper end of the second longitudinal section 223 is connected to a first material level detection device, which is used to detect the material level of the metal powder in the second longitudinal section 223, so as to assist in determining whether there is accumulation of metal powder in the second longitudinal section 223, so as to facilitate timely discovery and manual intervention.

[0044] Optionally, the third pipeline 230 includes a third longitudinal section 231, a second transverse section 232 and a fourth longitudinal section 233 connected in sequence, a third bellows 234 is provided on the third longitudinal section 231, a fourth bellows 235 is provided on the fourth longitudinal section 233, and the flow regulating valve includes a fourth flow regulating valve 440 provided on the third longitudinal section 231 and a fifth flow regulating valve 450 provided on the fourth longitudinal section 233, the fourth flow regulating valve 440 is located between the thermal dynamic degassing chamber 130 and the third bellows 234, and the fifth flow regulating valve 450 is located between the fourth bellows 235 and the sheath 140. Since the third pipeline 230 is also in a vacuum state during operation, the movement direction of the metal powder during the conveying process is adjusted by the third longitudinal section 231, the second transverse section 232 and the fourth longitudinal section 233 in different directions, so as to reduce the accumulation effect of the metal powder during the conveying process, so that the flow state of the metal powder in the third pipeline 230 changes, which can facilitate the precipitation and removal of the gas adsorbed on the metal powder. The third bellows 234 and the fourth bellows 235 can realize the detachable cooperation of the third pipeline 230, thereby realizing the convenient detachable cooperation between the thermal dynamic degassing chamber 130 and the sleeve 140. In addition, since the vibration table 180 works intermittently to apply vibration to the sleeve 140, the vibration effect will inevitably be transmitted to other parts of the powder multi-stage vacuum thermal degassing device. The third bellows 234 and the fourth bellows 235 can achieve the effect of vibration reduction and reduce the influence of the operation of the vibration table 180 on the overall equipment.

[0045] On the basis of the above-mentioned embodiment, along the direction from the third longitudinal section 231 to the fourth longitudinal section 233, the height of the second transverse section 232 is gradually reduced, and a second electromagnetic powder feeder 520 is provided on the second transverse section 232. The height of the metal powder gradually decreases during the flow through the third longitudinal section 231, the second transverse section 232 and the fourth longitudinal section 233 in sequence, so that the metal powder can fully rely on gravity during the transportation process of the third pipeline 230. The second electromagnetic powder feeder 520 is used to control the transportation flow of the metal powder and ensure that the powder is smoothly transported in the second transverse section 232. Preferably, the upper end of the fourth longitudinal section 233 is connected to a second material level detection device, which is used to detect the material level of the metal powder in the fourth longitudinal section 233, so as to assist in determining whether there is accumulation of metal powder in the fourth longitudinal section 233, so as to facilitate timely discovery and manual intervention.

[0046] The first vacuum unit 150 and the second vacuum unit 160 can be various vacuum units in the prior art, which can achieve a working vacuum degree of at least 5×10 -3Pa, for example, the first vacuum unit 150 and the second vacuum unit 160 may each include a set of rotary vane vacuum pumps, a set of Roots pumps, and a set of vacuum diffusion pumps. The first vacuum unit 150 is connected to the preheating chamber 120 through the fourth pipeline 240, and is connected to the thermal dynamic degassing chamber 130 through the fifth pipeline 250. The second vacuum unit 160 is connected to the jacket 140 through the sixth pipeline 260. Since the jacket 140 is a structure that is often disassembled, a sixth flow regulating valve 460 can be set on the sixth pipeline 260, which can facilitate the disassembly of the jacket 140 while realizing the control of the pipeline opening.

[0047] It should be noted that instruments or sensors for vacuum detection, temperature detection and gas detection can be installed at different positions of the powder multi-stage vacuum thermal degassing device of the present application as needed to detect the vacuum degree of the system, the relevant gas content and the temperature in the chamber, so as to realize the monitoring and parameter adjustment control of the process. For example, in some embodiments, Figure 1 As shown, both the preheating chamber 120 and the thermal dynamic degassing chamber 130 are provided with a vacuum detection instrument 320 and a temperature sensor 330 .

[0048] The present application also provides a method for operating the powder multi-stage vacuum thermal degassing device provided in the above embodiment. Figure 2 As shown, the method includes:

[0049] Step 1: Pre-vacuum the system. Arrange the powder tank 110, pre-heating chamber 120, thermal dynamic degassing chamber 130, and package 140 as follows: Figure 1 The first vacuum unit 150 and the second vacuum unit 160 are turned on and the vacuum degree reaches 5×10 -3 Pa.

[0050] Step 2: Preheating and pre-degassing the metal powder. All heating systems are turned on, and then a certain mass of powder from the powder tank 110 is transported to the preheating chamber 120 to complete the preheating and pre-degassing of the metal powder.

[0051] Step 3: Perform thermal dynamic degassing of metal powder. Open the corresponding flow control valve and electromagnetic powder feeder to transport the powder in the preheating chamber 120 to the thermal dynamic degassing chamber 130 at a certain flow rate. The metal powder is thermally degassed during the falling process, and the metal powder in the thermal dynamic degassing chamber 130 is further transported to the package 140.

[0052] Step 4: Perform thermal quasi-static degassing of the metal powder. The metal powder in the package 140 continues to be degassed, during which the vibration table 180 works intermittently to promote complete degassing of the powder.

[0053] At the same time, the second flow regulating valve 420 is closed, the first flow regulating valve 410 is opened, and the lower powder tank 110 continues to transport a certain mass of metal powder to the preheating chamber 120, thereby completing the preheating and pre-degassing of the next batch of metal powder. Steps 3 and 4 are repeated until the degassing of all metal powders is completed, and the entire process is completed.

[0054] Example 1

[0055] pass Figure 1 The device shown is used to vacuum degas nickel-based high-temperature alloy powder, and the powder loading mass is 800 kg.

[0056] (1) Put -270 mesh nickel-based high temperature alloy powder into the powder tank 110, press Figure 1 Connect the various parts in the device so that all valves are in the closed state;

[0057] (2) Pre-vacuum the system: start the first vacuum unit 150 and the second vacuum unit 160, and open the sixth flow control valve 460, so that the vacuum degree of the preheating chamber 120, the thermal dynamic degassing chamber 130 and the package 140 reaches 5×10 -3 Pa;

[0058] (3) Preheating and pre-degassing the nickel-based high-temperature alloy powder: all heating systems are turned on, the first flow regulating valve 410 is turned on, 20 kg of nickel-based high-temperature alloy powder in the lower powder tank 110 is transported to the preheating chamber 120, and then the first flow regulating valve 410 is closed to keep the preheating chamber 120 at 400°C to 450°C for 1 hour, and the vacuum degree is stabilized again and is less than 5×10 -3 Pa, complete preheating and pre-degassing of nickel-based high-temperature alloy powder;

[0059] (4) Performing thermal dynamic degassing: opening the second flow regulating valve 420, the third flow regulating valve 430, the fourth flow regulating valve 440 and the fifth flow regulating valve 450, opening the first electromagnetic powder feeder 510 and the second electromagnetic powder feeder 520, and conveying the nickel-based high-temperature alloy powder in the preheating chamber 120 to the thermal dynamic degassing chamber 130 at a certain flow rate (about 20 kg / 60 min), and the nickel-based high-temperature alloy powder is thermally degassed during the falling process, and the nickel-based high-temperature alloy powder in the thermal dynamic degassing chamber 130 is continuously conveyed to the sheath 140;

[0060] (5) Perform thermal quasi-static degassing: Close the fifth flow regulating valve 450, and the nickel-based high-temperature alloy powder continues to be degassed in the sheath 140. During this period, the vibration table 180 works intermittently, and each vibration is left to stand for 15 minutes after 5 minutes. The vibration frequency is 10-30Hz to promote the complete degassing of the nickel-based high-temperature alloy powder. At the same time, close the second flow regulating valve 420, open the first flow regulating valve 410, and the lower powder tank 110 continues to transport 20kg of nickel-based high-temperature alloy powder to the preheating chamber 120, thereby completing the preheating and pre-degassing of the next batch of metal powders;

[0061] (6) Repeat operations (4) and (5) until all the nickel-based high-temperature alloy powders are degassed and the entire process is completed. The oxygen content of the degassed nickel-based high-temperature alloy powder meets the process requirements for subsequent high-quality nickel-based high-temperature alloy blanks.

[0062] Example 2

[0063] pass Figure 1 The device shown is used for vacuum degassing of titanium alloy powder, with a powder loading mass of 160 kg.

[0064] (1) Put -100 mesh titanium alloy powder into the powder tank 110, press Figure 1 Connect the various parts of the device so that all valves are in the closed state;

[0065] (2) Pre-vacuum the system: start the first vacuum unit 150 and the second vacuum unit 160, and open the sixth flow control valve 460, so that the vacuum degree of the preheating chamber 120, the thermal dynamic degassing chamber 130 and the package 140 reaches 5×10 -3 Pa;

[0066] (3) Preheating and pre-degassing the titanium alloy powder: all heating systems are turned on, the first flow regulating valve 410 is turned on, 16 kg of titanium alloy powder in the lower powder tank 110 is transported to the powder preheating chamber 120, and then the first flow regulating valve 410 is closed to keep the preheating chamber 120 at 450°C to 500°C for 1 hour, and the vacuum degree is stabilized again and is less than 5×10 -3 Pa, complete the preheating and pre-degassing of titanium alloy powder;

[0067] (4) Performing thermal dynamic degassing: Open the second flow regulating valve 420, the third flow regulating valve 430, the fourth flow regulating valve 440 and the fifth flow regulating valve 450, and open the first electromagnetic powder feeder 510 and the second electromagnetic powder feeder 520, and transport the titanium alloy powder in the preheating chamber 120 to the powder thermal dynamic degassing chamber 130 at a certain flow rate (about 16 kg / 60 min). The titanium alloy powder is thermally degassed during the falling process, and the titanium alloy powder in the thermal dynamic degassing chamber 130 is continuously transported to the sleeve 140.

[0068] (5) Performing thermal quasi-static degassing: The fifth flow regulating valve 450 is closed, and the titanium alloy powder continues to be degassed in the jacket 140. During this period, the vibration table 180 works intermittently, and each vibration is left to stand for 15 minutes after 5 minutes. The vibration frequency is 10-30 Hz to promote the complete degassing of the titanium alloy powder. At the same time, the second flow regulating valve 420 is closed, the first flow regulating valve 410 is opened, and the lower powder tank 110 continues to transport 16 kg of titanium alloy powder to the preheating chamber 120, thereby completing the preheating and pre-degassing of the next batch of metal powders.

[0069] (6) Repeat operations (4) and (5) until all the titanium alloy powders are degassed and the entire process is completed. The oxygen content of the degassed titanium alloy powder meets the subsequent process requirements for high-quality titanium alloy blanks.

[0070] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0071] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0072] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A powder multi-stage vacuum thermal degassing device, characterized in that: include: A lower powder tank (110), a preheating chamber (120), a thermal dynamic degassing chamber (130) and a bag jacket (140) are sequentially connected from top to bottom; A first vacuum unit (150) is connected to the preheating chamber (120) and the thermal dynamic degassing chamber (130) respectively; A second vacuum unit (160) connected to the package (140); A jacket heating furnace (170), wherein the jacket (140) is located in a furnace of the jacket heating furnace (170); A vibration table (180), wherein the sheath (140) is fixed on the vibration table (180) via a sheath tool (190).

2. The powder multi-stage vacuum thermal degassing device according to claim 1, characterized in that: The lower powder tank (110) is connected to the preheating chamber (120) via a first pipeline (210), the preheating chamber (120) is connected to the thermal dynamic degassing chamber (130) via a second pipeline (220), and the thermal dynamic degassing chamber (130) is connected to the jacket (140) via a third pipeline (230), and the first pipeline (210), the second pipeline (220) and the third pipeline (230) are all provided with flow regulating valves.

3. The powder multi-stage vacuum thermal degassing device according to claim 2, characterized in that: The second pipeline (220) comprises a first longitudinal section (221), a first transverse section (222) and a second longitudinal section (223) which are connected in sequence; a first bellows (224) is arranged on the first longitudinal section (221); a second bellows (225) is arranged on the second longitudinal section (223); the flow regulating valve comprises a second flow regulating valve (420) arranged on the first longitudinal section (221) and a third flow regulating valve (430) arranged on the second longitudinal section (223); the second flow regulating valve (420) is located between the preheating chamber (120) and the first bellows (224); and the third flow regulating valve (430) is located between the second bellows (225) and the thermal dynamic degassing chamber (130).

4. The powder multi-stage vacuum thermal degassing device according to claim 3, characterized in that: Along the direction from the first longitudinal section (221) to the second longitudinal section (223), the height of the first transverse section (222) gradually decreases, and a first electromagnetic powder feeder (510) is arranged on the first transverse section (222).

5. The powder multi-stage vacuum thermal degassing device according to claim 4, characterized in that: The upper end of the second longitudinal section (223) is connected to a first material level detection device (610).

6. The powder multi-stage vacuum thermal degassing device according to claim 2, characterized in that: The third pipeline (230) comprises a third longitudinal section (231), a second transverse section (232) and a fourth longitudinal section (233) which are connected in sequence; a third bellows (234) is arranged on the third longitudinal section (231); a fourth bellows (235) is arranged on the fourth longitudinal section (233); the flow regulating valve comprises a fourth flow regulating valve (440) arranged on the third longitudinal section (231) and a fifth flow regulating valve (450) arranged on the fourth longitudinal section (233); the fourth flow regulating valve (440) is located between the thermal dynamic degassing chamber (130) and the third bellows (234); and the fifth flow regulating valve (450) is located between the fourth bellows (235) and the sheath (140).

7. The powder multi-stage vacuum thermal degassing device according to claim 6, characterized in that: Along the direction from the third longitudinal section (231) to the fourth longitudinal section (233), the height of the second transverse section (232) gradually decreases, and a second electromagnetic powder feeder (520) is arranged on the second transverse section (232).

8. The powder multi-stage vacuum thermal degassing device according to claim 7, characterized in that: The upper end of the fourth longitudinal section (233) is connected to a second material level detection device (620).

9. The powder multi-stage vacuum thermal degassing device according to claim 2, characterized in that: A weighing device (310) is installed at the bottom of the lower powder tank (110), and the flow regulating valve comprises a first flow regulating valve (410) arranged on the first pipeline (210).

10. The powder multi-stage vacuum thermal degassing device according to claim 1, characterized in that: The preheating chamber (120) and the thermal dynamic degassing chamber (130) are both provided with a vacuum detection instrument (320) and a temperature sensor (330).

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