Alloy powder degassing device and method

Abstract

The invention relates to the field of high-temperature alloy powder degassing, in particular to an alloy powder degassing device and method. The alloy powder degassing device comprises a vacuum obtaining part, a heating cavity, an alloy powder storage part, a bearing part, a connecting transmission part and a cam mechanism. Wherein a vacuum obtaining port of the heating cavity is connected with the vacuum obtaining component; the bearing component is arranged in the heating cavity; the alloy powder storage part is placed above the bearing part; the lower portion of the bearing component is connected with the cam mechanism through the connecting transmission component. According to the alloy powder degassing device, the harmful gas elements adsorbed on the surface of the alloy powder can be removed under the heating and vacuum conditions aiming at the alloy powder which is large in specific surface area and adsorbs the harmful gas elements on the surface, the content of the harmful gas elements in the alloy powder is reduced, the number of inclusions generated on line in the remelting process of the alloy powder is reduced, and the remelting quality of the alloy powder is improved. The waste powder purification treatment difficulty is reduced.

Description

Technical Field

[0001] The invention relates to the field of high-temperature alloy powder degassing, and in particular to an alloy powder degassing device and method. Background Art

[0002] With the rapid development of the aerospace industry, the demand for powdered high-temperature alloys and 3D printed high-temperature alloy products is increasing, and the amount of waste high-temperature alloy powder has increased significantly. Since the oxygen content in the waste powder is tens or even hundreds of ppm, a large number of inclusions are easily formed during remelting, and it cannot be directly recycled, which directly causes a large amount of high-temperature alloy powder to be wasted, idle or downgraded.

[0003] For the recycling and reuse of waste powder, high-purity smelting is a necessary step. The waste powder has a high oxygen content and is prone to generate inclusions online during the remelting process. The number of inclusions is large and the size is small, making purification very difficult. It is also difficult to ensure the cleanliness of the remanufactured high-temperature alloy master alloy.

[0004] Oxygen and nitrogen in waste powder exist in the form of physical adsorption and chemical adsorption. Physically adsorbed and partially metastable chemically adsorbed oxygen and nitrogen can be removed by vacuum heating degassing, thereby reducing the content of oxygen and nitrogen adsorbed on the surface of waste powder, thereby reducing the difficulty of high-purity smelting technology and improving the cleanliness of regenerated high-temperature alloy master alloy.

[0005] Waste powder has a large specific surface area, and a large amount of impurity elements such as O and N are adsorbed on the surface, some of which exist in the form of physical adsorption and chemical metastable adsorption. Direct remelting is prone to generate more small-sized inclusions online, resulting in a higher impurity content in the melt, which increases the difficulty of subsequent high-purity smelting. For powder degassing treatment, it is mainly used for pretreatment in the pre-packaging process of alloy powder pressing and forming at home and abroad. The main purpose is to partially remove harmful gases such as O and N adsorbed on the surface, in order to reduce the formation of original particle boundaries and heat-induced voids in subsequent pressed parts, thereby improving the performance and service life of components.

[0006] If the jacket degassing pressing and forming treatment method is adopted, although some harmful impurities in the waste powder can be desorbed, the treatment process is complicated and the pressed blocks need to be peeled later, which is costly and loses the economic feasibility of recycling the waste powder. At the same time, excessive peeling causes material waste, and incomplete peeling will introduce more impurity elements, resulting in reduced purity and making the purification of the waste powder more difficult.

[0007] In view of this, the present invention is proposed. Summary of the invention

[0008] In order to solve the problem that waste powder has a large specific surface area and a high content of absorbed harmful gas elements, which increases the difficulty of purification treatment in the subsequent waste powder remelting process, the present invention provides an alloy powder degassing device and method. The alloy powder degassing device has a good effect of removing impurity elements adsorbed on the surface of the alloy powder, thereby reducing the difficulty of purification treatment in the waste powder remelting process.

[0009] In order to achieve the above-mentioned purpose of the present invention, the following technical solutions are particularly adopted:

[0010] One aspect of the present invention relates to an alloy powder degassing device, comprising: a vacuum obtaining component, a heating chamber, an alloy powder storage component, a supporting component, a connecting transmission component and a cam mechanism;

[0011] Wherein, the vacuum obtaining port of the heating chamber is connected to the vacuum obtaining component;

[0012] The supporting component is inside the heating chamber; the alloy powder storage component is placed above the supporting component; and the supporting component is connected to the cam mechanism through the connecting transmission component.

[0013] The alloy powder degassing device is aimed at alloy powders with large specific surface area and harmful gas elements adsorbed on the surface. Under heating and vacuum conditions, it can remove harmful gas elements adsorbed on the surface of the alloy powder, reduce the harmful gas element content of the alloy powder, and further reduce the number of inclusions generated online during the alloy powder remelting process, thereby reducing the difficulty of waste powder purification treatment.

[0014] Another aspect of the present invention also relates to a method for degassing alloy powder, which is applicable to the alloy powder degassing device, and comprises the following steps:

[0015] (a) placing alloy powder to be processed into an alloy powder storage component; fixing the alloy powder storage device on a supporting component;

[0016] (b) turning on the vacuum obtaining component to evacuate the heating chamber; the cam mechanism starts to rotate; and the heating chamber is heated and kept warm;

[0017] (c) stopping the heating and heat preservation treatment, and performing a temperature reduction treatment in the heating chamber;

[0018] (d) The cam mechanism stops rotating, and the heating chamber is relieved of vacuum.

[0019] The alloy powder degassing method degasses the alloy powder under heating and vacuum conditions, which can effectively remove harmful impurity elements adsorbed on the surface of the alloy powder and reduce the content of harmful impurities in the alloy powder.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] (1) The alloy powder degassing device provided by the present invention is aimed at alloy powders with large specific surface area and harmful gas elements adsorbed on the surface. Under heating and vacuum conditions, it can remove harmful gas elements adsorbed on the surface of alloy powders, reduce the content of harmful gas elements in the alloy powders, and further reduce the number of inclusions generated online during the remelting process of the alloy powders, thereby reducing the difficulty of waste powder purification.

[0022] (2) The alloy powder degassing device provided by the present invention fully exposes hundreds of kilograms of alloy powder to vacuum through the vibration of the cam mechanism. Under certain temperature and vacuum degree, the impurity elements physically adsorbed and chemically metastable adsorbed on the surface of the alloy powder are quickly desorbed, thereby achieving the desorption of harmful impurities in the waste powder.

[0023] (3) The alloy powder degassing method provided by the present invention uses the alloy powder degassing device to degas the alloy powder under heating and vacuum conditions, which can effectively remove harmful impurity elements adsorbed on the surface of the alloy powder and reduce the content of harmful impurities in the alloy powder. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A schematic diagram of the structure of an alloy powder degassing device provided in an embodiment of the present invention;

[0026] Figure 2 A schematic diagram of the structure of a cam mechanism provided by an embodiment of the present invention;

[0027] Figure 3 A schematic diagram of the structure of a sun wheel tray provided in an embodiment of the present invention;

[0028] Figure 4 Element distribution diagram of the cross section of FGH97 alloy powder provided by an embodiment of the present invention;

[0029] Figure 5 This is a narrow energy scanning XPS spectrum of the surface of FGH97 waste high-temperature alloy powder provided in an embodiment of the present invention.

[0030] Reference numerals:

[0031] 1-vacuum obtaining component, 2-mechanical vacuum obtaining component, 3-Roots vacuum obtaining component, 4-heating chamber, 5-insulation layer, 6-heating component, 7-alloy powder storage component, 8-supporting component, 9-connecting transmission component, 10-cam mechanism, 11-vacuum detection component. DETAILED DESCRIPTION

[0032] The technical scheme of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and specific embodiments, but it will be understood by those skilled in the art that the following described embodiments are part of embodiments of the present invention, rather than all embodiments, and are only used to illustrate the present invention, and should not be considered as limiting the scope of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative work are within the scope of protection of the present invention. If specific conditions are not specified in the embodiments, they are carried out according to normal conditions or conditions recommended by the manufacturer. If the manufacturer is not specified in the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0033] One aspect of the present invention relates to an alloy powder degassing device, such as Figure 1 As shown, it includes: a vacuum obtaining component 1, a heating chamber 4, an alloy powder storage component 7, a supporting component 8, a connecting transmission component 9 and a cam mechanism 10;

[0034] Wherein, the vacuum obtaining port of the heating chamber 4 is connected to the vacuum obtaining component 1;

[0035] The supporting component 8 is inside the heating chamber 4 ; the alloy powder storage component 7 is placed above the supporting component 8 ; and the supporting component 8 is connected to the cam mechanism 10 through the connecting transmission component 9 at the bottom.

[0036] The alloy powder degassing device is aimed at alloy powders with large specific surface area and harmful gas elements adsorbed on the surface. It can remove harmful gas elements adsorbed on the surface of alloy powder under a certain temperature and vacuum degree, reduce the harmful gas element content of the alloy powder, and further reduce the number of inclusions generated online during the alloy powder remelting process, thereby reducing the difficulty of waste powder purification treatment.

[0037] The alloy powder degassing device, through the vibration of the cam mechanism 10, fully exposes the alloy powder of 100 kg to the vacuum. Under a certain temperature and vacuum degree, the impurity elements physically adsorbed and chemically metastable adsorbed on the surface of the alloy powder are quickly desorbed, thereby achieving the desorption of harmful impurities in the waste powder.

[0038] The alloy powder degassing device performs pretreatment on the alloy powder, and desorbs the impurity elements physically adsorbed and chemically metastable adsorbed by the waste powder before remelting to a large extent in a simple manner, thereby reducing the difficulty of subsequent high-purity smelting technology, improving the cleanliness of the regenerated master alloy, and improving the economy of the regenerated alloy.

[0039] The alloy powder degassing device described above does not specifically limit the specific type and source of the alloy powder. All alloy powders with physically adsorbed and chemically metastable adsorbed impurity elements on the surface can be degassed using the alloy powder degassing device, especially waste high-temperature alloy powders obtained in the aerospace field.

[0040] Harmful gases such as O and N are mainly adsorbed on the surface of waste high-temperature alloy powder in the form of physical adsorption and chemical adsorption. The physically adsorbed harmful gas elements include O 2 、N 2 , CO 2 , H 2 O, etc.; chemically adsorbed harmful gas elements Al 2 O 3 Cr 2 O 3 、CoO、Ni(OH) 2 etc., among which Ni(OH) 2 Impurity elements that belong to the metastable chemical adsorption form and are adsorbed in the form of physical adsorption and chemical metastable adsorption can be desorbed under a certain temperature and vacuum, thereby reducing the content of harmful gas elements in the waste powder, and further reducing the number of inclusions generated online during the waste powder remelting process, reducing the difficulty of waste powder purification treatment.

[0041] The present invention is based on the fact that the waste powder has a large specific surface area and can physically adsorb O 2 , H 2 O and other impurities, chemical adsorption of Ni(OH) 2 In order to remove metastable impurities such as metastable impurities, a simple batch vibration heating degassing device was designed. Through vacuum heating in a low partial pressure environment, physical adsorption and chemical metastable impurities are removed, which reduces the difficulty of subsequent high-purity smelting technology of waste powder and realizes low-cost recycling and reuse of waste powder.

[0042] In order to increase the vibration amplitude of the alloy powder, so that the waste powder can obtain sufficient momentum during the vibration process, and at the same time ensure the smoothness of the system operation process and improve the desorption effect of impurities, the present invention designs the parameters of the cam mechanism 10. The cam structure designed by the present invention is as follows: Figure 2 shown.

[0043] Furthermore, the stroke amplitude of the cam mechanism 10 is 75-85 mm (for example, it can be but not limited to any one of 75 mm, 77 mm, 79 mm, 81 mm, 83 mm or 85 mm, or a range between any two of them), the distal repose angle is 38-42° (for example, it can be but not limited to any one of 38°, 39°, 40°, 41° or 42°, or a range between any two of them), and the thrust travel angle is 68-72° (for example, it can be but not limited to 68°, 69 °, 70°, 71° or 72°, or a range between any two of them), the return angle is 68-72° (for example, it can be but not limited to any one of 68°, 69°, 70°, 71° or 72°, or a range between any two of them), and the near-resistance angle is 174-186° (for example, it can be but not limited to any one of 174°, 176°, 178°, 180°, 182°, 184° or 186°, or a range between any two of them).

[0044] The stroke amplitude and far repose angle defined in the present invention can help the powder in the alloy powder storage component 7 to obtain sufficient momentum, so that gaps are formed between each other, so that the waste powder in the alloy powder storage component 7 can fully contact the vacuum and remove impurities.

[0045] The thrust angle, return angle and near-rest angle defined in the present invention allow each arc segment to have a smooth transition, so that the waste powder can obtain sufficient momentum during the vibration process, while ensuring the smoothness of the system operation process.

[0046] Furthermore, the cam mechanism 10 is located at the center of the vibration system to increase the stability of the system.

[0047] Furthermore, the weight of the alloy powder supported by the supporting component 8 at a time is 50-300 kg, including but not limited to any point value of 50 kg, 100 kg, 150 kg, 200 kg, 250 kg or 300 kg, or a range between any two of them.

[0048] Furthermore, the alloy powder storage device is fixed at the center of the supporting component 8, or a plurality of the alloy powder storage devices are symmetrically distributed on the supporting component 8.

[0049] Furthermore, a heat-insulating layer 5 is provided on the inner wall of the heating chamber 4 .

[0050] Furthermore, a heating component 6 is disposed in the heating chamber 4 .

[0051] The heat-insulating layer 5 and the heating component 6 constitute a heating and heat-insulating system, which can keep the temperature in the heating chamber 4 constant.

[0052] Furthermore, a vacuum detection component 11 is provided on the heating chamber 4 .

[0053] Furthermore, the lower end of the heating chamber 4 is provided with a cam connection mechanism, which is mainly used to connect an external motor to realize the rotation of the cam mechanism 10, thereby achieving the purpose of providing power for the vibration system.

[0054] Furthermore, the vacuum obtaining component 1 includes: a mechanical vacuum obtaining component 2 and a Roots vacuum obtaining component 3; the mechanical vacuum obtaining component 2, the Roots vacuum obtaining component 3 and the heating chamber 4 are sequentially connected. This connection mode is conducive to maintaining the vacuum degree of the heating chamber 4.

[0055] In some specific embodiments, the mechanical vacuum obtaining component 2 includes but is not limited to: a mechanical vacuum pump.

[0056] In some specific implementations, the Roots vacuum obtaining component 3 includes but is not limited to: a Roots vacuum pump.

[0057] In some specific embodiments, the heating chamber 4 includes but is not limited to: a heating furnace.

[0058] In some specific embodiments, the supporting member 8 includes but is not limited to: a sun wheel tray and / or an integral tray, such as Figure 3 As shown, the sun wheel tray can reduce the weight of the vibration system. The support is not a fixed platform, mainly used to fix the waste powder vibration barrel. In order to reduce weight, the present invention adopts a wheel type, and can also be other structures, such as honeycomb, porous, etc.

[0059] In some specific embodiments, the alloy powder storage component 7 includes but is not limited to: an alloy powder barrel.

[0060] In some specific implementations, the connecting transmission component 9 includes but is not limited to: a connecting rod pulley.

[0061] Another aspect of the present invention also relates to a method for degassing alloy powder, which is applicable to the alloy powder degassing device, and comprises the following steps:

[0062] (a) placing the alloy powder to be processed into the alloy powder storage component 7; fixing the alloy powder storage device on the supporting component 8;

[0063] (b) the vacuum obtaining component 1 is turned on to evacuate the heating chamber 4; the cam mechanism 10 starts to rotate; and the heating chamber 4 is heated and kept warm;

[0064] (c) stopping the heating and heat preservation treatment, and performing a temperature reduction treatment on the heating chamber 4;

[0065] (d) The cam mechanism 10 stops rotating, and the heating chamber 4 is released from vacuum.

[0066] The alloy powder degassing method adopts the alloy powder degassing device to degas the alloy powder under heating and vacuum conditions, which can effectively remove harmful impurity elements adsorbed on the surface of the alloy powder and reduce the content of harmful impurities in the alloy powder.

[0067] Furthermore, a motor is used to drive the cam mechanism 10 to rotate, and the speed of the motor is 500-1000 r / min, including but not limited to any point value of 500 r / min, 600 r / min, 700 r / min, 800 r / min, 900 r / min or 1000 r / min or a range value between any two. The speed of the motor determines the rotation frequency of the cam mechanism 10. By limiting the speed of the motor, the rotation frequency of the cam mechanism 10 can be limited to a reasonable range, thereby improving the desorption effect of impurity elements.

[0068] Furthermore, the vacuum degree of the vacuum treatment is 5-20 Pa, including but not limited to any point value of 5Pa, 8Pa, 10Pa, 13Pa, 15Pa, 18Pa or 20Pa or a range value between any two of them. The degassing treatment of the alloy powder under this vacuum degree has a good degassing effect and effectively reduces the content of impurity elements adsorbed on the surface of the alloy powder.

[0069] Furthermore, the heating chamber 4 is evacuated by using the mechanical vacuum obtaining component 2 and the Roots vacuum obtaining component 3 in sequence.

[0070] Furthermore, the mechanical vacuum obtaining component 2 controls the vacuum degree in the heating chamber 4 to be between 100 and 300 Pa, including but not limited to any point value of 100 Pa, 120 Pa, 140 Pa, 160 Pa, 180 Pa, 200 Pa, 220 Pa, 240 Pa, 260 Pa, 280 Pa or 300 Pa or a range value between any two of them.

[0071] Furthermore, the Roots vacuum obtaining component 3 is used to control the vacuum degree in the heating chamber 4 to be 5-20 Pa, including but not limited to any point value of 5Pa, 8Pa, 10Pa, 13Pa, 15Pa, 18Pa or 20Pa or a range value between any two of them.

[0072] Furthermore, the temperature of the heating and heat preservation treatment is 200-600°C, including but not limited to any point value of 200°C, 250°C, 300°C, 350°C, 400°C, 450°C, 500°C, 550°C or 600°C or a range value between any two of them.

[0073] Furthermore, the heating and insulation treatment time is 4 to 24 hours, including but not limited to any one of 4 hours, 6 hours, 8 hours, 10 hours, 12 hours, 14 hours, 16 hours, 18 hours, 20 hours, 22 hours or 24 hours or a range between any two of them.

[0074] Limiting the temperature and time of the heating and heat-insulating treatment within a certain range can effectively remove impurities adsorbed on the surface of the alloy powder and reduce the oxygen and nitrogen content of the alloy powder.

[0075] Furthermore, the heating rate of the heating and heat preservation treatment is 10 to 20°C / min, including but not limited to any point value of 10°C / min, 12°C / min, 14°C / min, 16°C / min, 18°C / min or 20°C / min or a range value between any two of them.

[0076] Furthermore, the vacuum degree of the heating and heat preservation treatment is 0.001-0.1Pa, including but not limited to any point value of 0.001Pa, 0.005Pa, 0.01Pa, 0.015Pa, 0.035Pa, 0.055Pa, 0.075Pa, 0.095Pa or 0.1Pa or the range value between any two of them.

[0077] Furthermore, when the heating chamber 4 is subjected to the temperature reduction treatment, the vibrating state and the vacuum state are maintained, and the vacuum degree is maintained within the range of 0.001 to 0.1 Pa.

[0078] The embodiments of the present invention will be described in detail below in conjunction with the examples, but it will be appreciated by those skilled in the art that the following examples are only used to illustrate the present invention and should not be considered as limiting the scope of the present invention. If no specific conditions are specified in the examples, the conditions are carried out according to normal conditions or the conditions recommended by the manufacturer. If the manufacturer of the reagents or instruments used is not specified, they are all conventional products that can be obtained commercially.

[0079] Example 1

[0080] This embodiment takes FGH97 alloy powder waste as an example for detection.

[0081] The specific surface area of ​​FGH97 alloy waste powder is large, and more impurity elements are adsorbed on the surface. The amount of impurity adsorption increases with the storage time. Figure 4 shown.

[0082] The surface element composition and chemical valence state of FGH97 alloy powder waste were analyzed by XPS. Figure 5This is the narrow energy scanning XPS spectrum of O1s, Al2p, Ni2p, and Cr2p on the surface of FGH97 waste high-temperature alloy powder. From the spectrum of O1s in the figure, it can be seen that there are spectral peaks corresponding to the binding energy of metal oxides on the surface of FGH97 waste high-temperature alloy, indicating that metal oxides must exist on the surface of waste high-temperature alloy. 2 O 3 The peak of the spectrum proves that there is Al on the surface of the high-temperature alloy 2 O 3 . Ni(OH) exists in the spectrum of Ni2p 2 In the spectrum of Cr2p, we can get Cr 2 O 3 In summary, the oxide layer on the surface of FGH97 waste high-temperature alloy powder is a composite oxide layer of metal oxides and hydroxides, and its main component is Al 2 O 3 Cr 2 O 3 and Ni(OH) 2 wait.

[0083] Example 2

[0084] The alloy powder degassing device provided in this embodiment includes: a mechanical vacuum obtaining component 2, a Roots vacuum obtaining component 3, a heating chamber 4, an alloy powder storage barrel, a sun wheel tray, a connecting rod pulley and a cam mechanism 10;

[0085] Wherein, the mechanical vacuum obtaining component 2 and the Roots vacuum obtaining component 3 are connected to the heating chamber 4 in sequence;

[0086] The sun wheel tray is inside the heating chamber 4; an alloy powder storage barrel is placed above the sun wheel tray; the bottom of the sun wheel tray is connected to the cam mechanism 10 through a connecting rod pulley;

[0087] The stroke amplitude of the cam mechanism 10 is 80 mm, the distal repose angle is 40°, the thrust angle is 70°, the return angle is 70°, and the proximal repose angle is 180°;

[0088] A heat-insulating layer 5 is arranged on the inner wall of the heating chamber 4 ; a heating component 6 is arranged in the heating chamber 4 .

[0089] Example 3

[0090] The only difference between this embodiment and embodiment 2 is that the stroke amplitude of the cam mechanism 10 is 75 mm, the distal repose angle is 38°, the thrust angle is 68°, the return angle is 68°, and the proximal repose angle is 186°.

[0091] Example 4

[0092] The only difference between this embodiment and embodiment 2 is that the stroke amplitude of the cam mechanism 10 is 85 mm, the distal repose angle is 42°, the thrust stroke angle is 72°, the return stroke angle is 72°, and the proximal repose angle is 174°.

[0093] Example 5

[0094] The alloy powder degassing method provided in this embodiment is to degas the waste powder of the high-temperature alloy FGH97 mentioned in Example 1, using the alloy powder degassing device of Example 2, with a single powder addition amount of 50 kg, comprising the following steps:

[0095] (1) Powder loading: 50 kg of waste powder is evenly divided into three stainless steel barrels with an inner diameter of 50 cm and a height of 60 cm;

[0096] (2) Powder barrel fixation: The powder barrel is fixed on the sun wheel tray at equal angles and the center of the barrel is located at half the radius of the sun wheel tray, ensuring that the center of the wheel tray and the center of gravity basically coincide;

[0097] (3) Vacuuming and vibration: Close the furnace door, start the mechanical pump to evacuate, turn on the motor, and the motor drives the cam at a speed of 800r / min to keep the waste powder vibrating in the barrel. When the vacuum degree reaches 200Pa, turn on the Roots pump to continue evacuating;

[0098] (4) Vibration heating degassing: When the vacuum degree reaches 12 Pa, the furnace body begins to heat up at a heating rate of 15 °C / min. After reaching the predetermined temperature, the vacuum degree is below 0.1 Pa and the temperature is kept for a long time as required. The predetermined temperature and the temperature holding time are shown in Table 1.

[0099] (5) Cooling: Stop heating, let the furnace cool to room temperature, and maintain vibration and furnace vacuum;

[0100] (6) Stop: The furnace body is cooled to room temperature, the vibration is stopped, the furnace body is vacuumed, and the powder is quickly taken out for high-purity smelting.

[0101] The chemical analysis method was used to detect the O and N contents of the powder after vacuum vibration degassing, and a comparative study was conducted. The results are shown in Table 1. As can be seen from Table 1, with the increase of temperature, the O content of the waste powder first decreases and then increases, and the N content changes less, indicating that the vibration degassing process between 400 and 600 °C has a good effect on removing impurities in the waste powder.

[0102] Table 1 O and N contents of FGH97 waste powder at different temperatures and insulation time in Example 5

[0103]

[0104] Example 6

[0105] The difference between this embodiment and embodiment 5 is that the degassing device of embodiment 3 is used, and in step (3), when the vacuum degree reaches 300 Pa, the Roots pump is turned on to continue evacuating; in step (4), when the vacuum degree reaches 5 Pa, the furnace body begins to heat up at a heating rate of 10°C / min, the predetermined temperature is 350°C, and the insulation time is 10 h.

[0106] Example 7

[0107] The difference between this embodiment and embodiment 5 is that the degassing device of embodiment 4 is used. The difference between this embodiment and embodiment 5 is that in step (3), when the vacuum degree reaches 100 Pa, the Roots pump is turned on to continue evacuating; in step (4), when the vacuum degree reaches 20 Pa, the furnace body begins to heat up at a heating rate of 10°C / min, the predetermined temperature is 450°C, and the insulation time is 18h.

[0108] Comparative Example 1

[0109] The difference between this comparative example and Example 5 is that the cam mechanism 10 of the alloy powder degassing device used is different. The stroke amplitude of the cam mechanism 10 is 90 mm, the far repose angle is 36°, the push angle is 66°, the return angle is 66°, the near repose angle is 192°, the predetermined temperature is 500°C, and the insulation time is 24 hours.

[0110] Comparative Example 2

[0111] The difference between this comparative example and Example 5 is that the vacuum degree of the vacuum treatment is 2 Pa, the predetermined temperature is 500° C., and the insulation time is 24 h.

[0112] Table 2 O and N contents of FGH97 waste powder in Examples 6 to 7 and Comparative Example

[0113] Degassing temperature / ℃ Insulation time / h O / ppm N / ppm Original powder - 67 7 Example 6 10 33 3 Example 7 18 37 4 Comparative Example 1 24 34 4 Comparative Example 2 24 36 4

[0114] Experimental example

[0115] The waste powder after degassing in Example 5 was added at a ratio of 30% to prepare FGH97 vacuum horizontal continuous casting master alloy, and the cleanliness test was compared with 100% vacuum horizontal continuous casting new material master alloy and vacuum die casting new material master alloy, as shown in Table 3. It shows that the waste powder treatment process is suitable for the recycling treatment of waste powder, and the master alloy with added waste powder can reach the cleanliness level of the new material master alloy.

[0116] Table 3 Comparison of O and N content between FGH97 waste powder return material and new material master alloy

[0117]

[0118] Although the present invention has been illustrated and described with specific embodiments, it should be appreciated that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Those skilled in the art should understand that the technical solutions described in the above embodiments may be modified, or some or all of the technical features thereof may be replaced by equivalents without departing from the spirit and scope of the present invention. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention. Therefore, this means that all such replacements and modifications within the scope of the present invention are included in the appended claims.

Claims

1. An alloy powder degassing device, characterized in that: include: Vacuum obtaining components, heating chamber, alloy powder storage components, supporting components, connecting transmission components and cam mechanisms; Wherein, the vacuum obtaining port of the heating chamber is connected to the vacuum obtaining component; The supporting component is inside the heating chamber; the alloy powder storage component is placed above the supporting component; and the supporting component is connected to the cam mechanism through the connecting transmission component.

2. The alloy powder degassing device according to claim 1, characterized in that: The cam mechanism has a stroke amplitude of 75 to 85 mm, a distal repose angle of 38 to 42 degrees, a thrust angle of 68 to 72 degrees, a return angle of 68 to 72 degrees, and a proximal repose angle of 174 to 186 degrees.

3. The alloy powder degassing device according to claim 1, characterized in that: The supporting components include: a sun wheel tray and / or an integral tray; And / or, the connecting transmission component includes: a connecting rod pulley.

4. The alloy powder degassing device according to claim 1, characterized in that: A heat-insulating layer is provided on the inner wall of the heating chamber; And / or, a heating component is provided in the heating chamber.

5. The alloy powder degassing device according to claim 1, characterized in that: The vacuum obtaining component includes: a mechanical vacuum obtaining component and a Roots vacuum obtaining component; The mechanical vacuum obtaining component and the Roots vacuum obtaining component are connected to the heating chamber in sequence.

6. A method for degassing alloy powder, applicable to the alloy powder degassing device as claimed in any one of claims 1 to 5, characterized in that: The following steps are involved: (a) placing alloy powder to be processed into an alloy powder storage component; fixing the alloy powder storage device on a supporting component; (b) turning on the vacuum obtaining component to evacuate the heating chamber; the cam mechanism starts to rotate; and the heating chamber is heated and kept warm; (c) stopping the heating and heat preservation treatment, and performing a temperature reduction treatment in the heating chamber; (d) The cam mechanism stops rotating, and the heating chamber is relieved of vacuum.

7. The alloy powder degassing method according to claim 6, characterized in that: The cam mechanism is driven to rotate by a motor, and the rotation speed of the motor is 500-1000 r / min.

8. The alloy powder degassing method according to claim 6, characterized in that: The vacuum degree of the vacuum treatment is 5-20Pa.

9. The alloy powder degassing method according to claim 6, characterized in that: The temperature of the heating and heat preservation treatment is 200-600°C; And / or, the heating and heat preservation treatment time is 4 to 24 hours.

10. The alloy powder degassing method according to claim 6, characterized in that: The heating rate of the heating and heat preservation treatment is 10 to 20°C / min; And / or, the vacuum degree of the heating and heat preservation treatment is 0.001-0.1Pa.

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