A preparation method and application of a combined package and powder high-temperature alloy part

Abstract

The present invention relates to the technical field of hot isostatic pressing products, and in particular, to a method for preparing and applying a combined sleeve and a powder high-temperature alloy part. The combined sleeve comprises a sleeve body and at least one supplementary sleeve located above the sleeve body; the supplementary sleeve comprises an upper wall and a first side wall and a second side wall respectively connected to both ends of the upper wall, and the upper wall, the first side wall and the second side wall together form a material storage space; the sleeve body has a cavity structure, and the top of the sleeve body has an opening; the bottom end of the first side wall and the bottom end of the second side wall are respectively connected to the top of the sleeve body, and the material storage space and the cavity structure are connected through the opening; the angles between the upper wall and the first side wall and the second side wall are less than 90°. The combined sleeve provided by the present invention can reduce the shrinkage of the sleeve body, make the shrinkage of the sleeve body more regular, and can improve the utilization rate of high-temperature alloy powder, reduce the processing allowance of the blank after hot isostatic pressing, and reduce the production cost of alloy parts.

Description

Technical Field

[0001] The invention relates to the technical field of hot isostatic pressing products, and in particular to a preparation method and application of a combined package and powder high-temperature alloy part. Background Art

[0002] FGH4095 alloy is the first generation of powder high temperature alloy developed in my country that can be used for a long time at 650℃. It has high yield strength and excellent low-cycle fatigue performance. It is mainly used to manufacture key components such as compressor discs, turbine discs, and baffles of advanced aircraft engines. FGH4095 alloy turbine disc baffle material has passed bench test, flight assessment and material development and identification in the new aircraft engine under development, and has been mass-produced. FGH4095 alloy baffle is the first powder high temperature alloy part used in aircraft engines in my country. The FGH4095 alloy turbine disc and guide disc formed by direct hot isostatic pressing have also passed the disc structure test and installation assessment, and have been successfully used in advanced turboshaft engines.

[0003] At present, FGH4095 alloy baffle ring parts are mainly prepared by vacuum induction melting (VIM) technology to prepare master alloy rods + plasma rotating electrode atomization powder making (PREP) + direct hot isostatic pressing (HIP) near-net forming + heat treatment process. Among them, direct hot isostatic pressing near-net forming is a cost-effective preparation process for powder high-temperature alloy discs. The reason for its high cost-effectiveness is that it is easy to achieve near-net forming of discs, high material utilization rate, low cost, and the pressed discs have the outstanding advantages of uniform organization and good performance consistency. The structure of engine hot upper wall parts such as powder high-temperature alloy discs, shafts, and rings is very complex, and the machining is difficult, costly, and the material utilization rate is low. The hot isostatic pressing near-net forming process can increase the material utilization rate by 50% while ensuring the excellent mechanical properties of the parts, and the manufacturing cost can be reduced by 50%~80%. It has shown strong technical and economic advantages in the manufacturing of complex parts of nickel-based powder high-temperature alloys.

[0004] However, there is still much room for improvement in the near-net-shape powder high-temperature alloy baffle ring parts produced by direct hot isostatic pressing (HIP). Even if a steel core tooling is added in the middle of the baffle ring sleeve during the hot isostatic pressing process, after high temperature and high pressure hot isostatic pressing, the upper and lower end faces of the sleeve and the center of the outer cylindrical side will still shrink and deform greatly. The volume shrinkage of the sleeve is large, about 30%, and the shrinkage of various parts of the sleeve is uneven, resulting in the need to machine the alloy blanks at the places where the shrinkage deformation of the sleeve is large, resulting in a decrease in the number of finished products and an increase in product production costs. Figure 1 , which is a schematic diagram of the shrinkage deformation of the baffle-type annular parts after hot isostatic pressing (the rear half of the overall longitudinal section).

[0005] The technical difficulty of near-net forming by hot isostatic pressing lies mainly in the design of the can. The density, size and performance of the final formed part are mainly guaranteed by the preparation design of the can and the process parameters. For complex parts, the production cost of the can is high and the cycle is long. In addition, during the hot isostatic pressing process of the powder particles, the powder shrinks significantly and is accompanied by irregular deformation, which makes it difficult to control the shape. The hot isostatic pressing process is a complex thermal-mechanical coupling, large deformation and nonlinear process. The problem of part shape control is difficult to be solved well. When using the traditional trial and error method, the design of the powder high-temperature alloy can relies more on experience, the powder utilization rate is low, and the production cost of the disc is increased. In addition, the design needs to be repeatedly revised according to the test results, which makes it difficult to ensure the quality of the product. The development cycle is long and it is difficult to meet the rapid development requirements of the modern aviation manufacturing industry.

[0006] In addition, in terms of production cost control of powder high-temperature alloy parts, due to unclear understanding of the shrinkage law of powder during hot isostatic pressing, the designed powder packaging amount is too high, the blank processing allowance is large, and the production cost of alloy parts is increased.

[0007] Therefore, optimizing the design of the can can achieve near-net forming of nickel-based powder high-temperature alloy parts by hot isostatic pressing, which will provide a new solution for the manufacture of key parts in the aerospace and other fields, and has important practical significance.

[0008] In view of this, the present invention is proposed. Summary of the invention

[0009] The first purpose of the present invention is to provide an optimized design scheme for a combined sleeve. By setting a supplementary sleeve, the shrinkage process of the sleeve during the near-net forming process of direct hot isostatic pressing can be controlled. When the sleeve body shrinks and deforms during the hot isostatic pressing process, the high-temperature alloy powder in the supplementary sleeve will flow into the sleeve body under the action of gravity to reduce abnormal deformations such as pits and warping during the shrinkage of the sleeve body, thereby reducing the shrinkage of the sleeve body and making the shrinkage of the sleeve body more regular. At the same time, by setting a supplementary sleeve, the present invention can improve the utilization rate of high-temperature alloy powder, reduce the processing allowance of the blank after hot isostatic pressing, and reduce the production cost of alloy parts. It solves the problems of large volume shrinkage of traditional sleeves after high-temperature and high-pressure hot isostatic pressing, uneven shrinkage of various parts, difficulty in shape control, high powder content in the sleeve, large blank processing allowance, and high production cost of alloy parts.

[0010] The second purpose of the present invention is to provide a method for preparing powder high-temperature alloy parts, which uses a combined sleeve with a supplementary sleeve to improve the utilization rate of high-temperature alloy powder, reduce the processing allowance of the blank after hot isostatic pressing, and reduce the production cost of powder high-temperature alloy parts.

[0011] The third object of the present invention is to provide a method for preparing a combined casing or a powder high-temperature alloy part for use in the aerospace field.

[0012] In order to achieve the above-mentioned purpose of the present invention, the following technical solutions are particularly adopted:

[0013] The present invention first provides a combined bag, which is used for hot isostatic pressing, and comprises a bag body and at least one supplementary bag located above the bag body;

[0014] The supplementary package comprises an upper wall and a first side wall and a second side wall respectively connected to both ends of the upper wall, wherein the upper wall, the first side wall and the second side wall together form a material holding space;

[0015] The package body has a cavity structure, and the top end of the package body has an opening;

[0016] The bottom end of the first side wall and the bottom end of the second side wall are respectively connected to the top end of the package body, and the material holding space and the cavity structure are connected through the opening;

[0017] An included angle between the upper wall and the first side wall is less than 90°, and an included angle between the upper wall and the second side wall is less than 90°.

[0018] Furthermore, an angle between the upper wall and the first side wall is 75° to 85°.

[0019] Furthermore, an angle between the upper wall and the second side wall is 75° to 85°.

[0020] Furthermore, the wall thickness T of the first side wall is 第一侧壁 and the package body T 本体 The wall thickness satisfies the following relationship: 第一侧壁 =3.5~4T 本体 .

[0021] Furthermore, the wall thickness T of the second side wall is 第二侧壁 and the package body T 本体 The wall thickness satisfies the following relationship: 第二侧壁 =3.5~4T 本体 .

[0022] Furthermore, the thickness T of the upper wall 上壁 and the package body T 本体 The wall thickness satisfies the following relationship: 上壁 =0.5~1T 本体 .

[0023] Furthermore, the number of the supplementary packages is at least eight.

[0024] Furthermore, the number N of the supplementary packages 补充 Satisfies the following relationship: N 补充 =K×S 本体上 ×V 本体 ; Where K is the correlation coefficient, K=1×10 -12 ~5×10 -12 ; S 本体上 is the upper surface area of ​​the package body or the equivalent upper surface area, in mm 2 ; V 本体 is the volume of the package body, in mm 3 .

[0025] Furthermore, the total volume V of the supplementary package is 补充 Satisfies the following relationship: V 补充 =h×V 本体 ; Where h is the supplementary coefficient, h=0.02~0.2; V 本体 is the volume of the package body, in mm 3 .

[0026] Furthermore, the strength of the material of the supplementary sheath at the hot isostatic pressing temperature is higher than the strength of the material of the sheath body at the hot isostatic pressing temperature.

[0027] Furthermore, the material of the sheath body includes at least one of aluminum alloy, low carbon steel, rubber, glass and ceramic.

[0028] Furthermore, when the material of the sheath body is low carbon steel, the material of the supplementary sheath includes S310S stainless steel.

[0029] Furthermore, when the material of the sheath body is aluminum alloy, the material of the supplementary sheath includes titanium alloy.

[0030] Furthermore, the inner surface of the supplementary package is provided with a high temperature resistant coating.

[0031] Furthermore, a ceramic bushing is provided on the inner surface of the supplementary sleeve.

[0032] Furthermore, high-temperature alloy powder is disposed inside the sheath body and the supplementary sheath, and the first side wall and the second side wall are connected to the sheath body by welding, respectively.

[0033] The present invention further provides a method for preparing a powder high-temperature alloy part, comprising the following steps: respectively loading high-temperature alloy powder into a sheath body and a supplementary sheath of the combined sheath, and performing hot isostatic pressing treatment, and then removing the combined sheath to obtain a blank; and heat treating and processing the blank to obtain the powder high-temperature alloy part.

[0034] Furthermore, the machining allowance of the blank is 3-7 mm.

[0035] Furthermore, the volume of the high temperature alloy powder in the supplementary package is Σ 补充粉末 Satisfies the following relationship: 补充粉末 =N 补充 ×V 补充 ; Among them, N 补充 is the number of the supplementary packages; V 补充 is the volume of the supplementary package, in mm 3 .

[0036] Furthermore, the method for preparing the high-temperature alloy powder includes: preparing a master alloy rod by using vacuum horizontal continuous casting technology, and then powdering the master alloy rod and performing powder processing to obtain the high-temperature alloy powder; wherein the sum of the oxygen and nitrogen contents in the master alloy rod is ≤15ppm; and / or the number of inclusions in the high-temperature alloy powder is ≤10 particles / kg.

[0037] Furthermore, the high temperature alloy powder includes nickel-based high temperature alloy powder.

[0038] Furthermore, the powder high temperature alloy part includes at least one of a powder high temperature alloy annular part, a powder high temperature alloy cylindrical part and a powder high temperature alloy square part.

[0039] The present invention also provides application of the combined casing or the method for preparing the powder high-temperature alloy part in the field of aerospace.

[0040] Compared with the prior art, the present invention has the following beneficial effects:

[0041] (1) The combined sleeve provided by the present invention can control the shrinkage process of the sleeve during the near-net forming process of direct hot isostatic pressing by providing a supplementary sleeve. When the sleeve body shrinks and deforms during the hot isostatic pressing process, the high-temperature alloy powder in the supplementary sleeve will flow into the interior of the sleeve body under the action of gravity to reduce abnormal deformations such as pits and warping during the shrinkage of the sleeve body, thereby reducing the shrinkage of the sleeve body, making the shrinkage of the sleeve body more regular, increasing the number of finished products, and reducing the production cost of the product.

[0042] (2) The combined package provided by the present invention can improve the utilization rate of high-temperature alloy powder, reduce the processing allowance of the blank after hot isostatic pressing, and reduce the production cost of powder high-temperature alloy parts.

[0043] (3) The method for preparing the powder high-temperature alloy parts provided by the present invention can improve the utilization rate of the high-temperature alloy powder, reduce the processing allowance of the blank after hot isostatic pressing, and reduce the production cost of the powder high-temperature alloy parts.

[0044] (4) The ultra-clean, low-cost method for preparing powder high-temperature alloy parts provided by the present invention adopts vacuum horizontal continuous casting technology (VHCC) to prepare master alloy rods, which can reduce the number of inclusions in the ingot and improve the cleanliness of the powder high-temperature alloy parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] 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.

[0046] Figure 1 It is a schematic diagram of the shrinkage deformation of the sheath of the near-net-shape powder high-temperature alloy baffle ring parts using direct hot isostatic pressing in the prior art;

[0047] Figure 2 A schematic diagram of the structure of the combined package provided by the present invention;

[0048] Figure 3 A schematic diagram of the shrinkage deformation of the combined package after hot isostatic pressing provided by the present invention;

[0049] Figure 4 for Figure 3 A partial enlarged schematic diagram of

[0050] Figure 5 A schematic flow chart of the method for preparing a powder high-temperature alloy part provided by the present invention.

[0051] Reference numerals:

[0052] 1-package body; 11-cavity structure; 12-opening; 2-supplementary package; 21-upper wall; 22-first side wall; 23-second side wall; 24-material storage space. DETAILED DESCRIPTION

[0053] 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.

[0054] If there is no special explanation, in the present invention, "the first aspect", "the second aspect", "the third aspect", "the fourth aspect", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or quantity, nor can they be understood as implicitly indicating the importance or quantity of the indicated technical features. Moreover, "the first", "the second", "the third", "the fourth", etc. only serve the purpose of non-exhaustive enumeration and description, and it should be understood that they do not constitute a closed limitation on quantity.

[0055] If there is no special explanation, the "include" and "comprising" mentioned in the present invention represent open-ended or closed-ended expressions. For example, the "include" and "comprising" may represent that other components not listed may also be included or only the listed components may be included or only the listed components may be included.

[0056] If there is no special explanation, in the present invention, "one or more" or "at least one" refers to any one, any two or more of the listed items. Among them, "several" refers to any two or more of the listed items.

[0057] In a first aspect, the present invention provides a combined sleeve, which is used for preparing alloy parts by hot isostatic pressing. The structural schematic diagram of the combined sleeve is as follows: Figure 2 The combined package comprises a package body 1 and at least one supplementary package 2 located above the package body 1 .

[0058] The supplementary sheath 2 is arranged above the sheath body 1 to facilitate the high-temperature alloy powder to flow into the sheath body 1 under the action of gravity, thereby playing a role in supplementing shrinkage.

[0059] The number of the supplementary packages 2 can be one, two, three, four, five, six, eight, ten, twelve, fifteen, eighteen, twenty, twenty-five, thirty or more.

[0060] See also Figure 1The supplementary package 2 includes an upper wall 21 and a first side wall 22 and a second side wall 23 respectively connected to both ends of the upper wall 21. The upper wall 21, the first side wall 22 and the second side wall 23 together form a material storage space 24, which is used to fill high-temperature alloy powder.

[0061] The sheath body 1 has a cavity structure 11 for filling high-temperature alloy powder, and the top of the sheath body 1 has an opening 12 . The opening 12 allows the high-temperature alloy powder in the supplementary sheath 2 to enter the sheath body 1 .

[0062] The bottom end of the first side wall 22 (i.e., the end away from the upper wall 21) and the bottom end of the second side wall 23 (i.e., the end away from the upper wall 21) are respectively connected to the top of the sheath body 1 to form a whole. The material storage space 24 and the cavity structure 11 are connected through the opening 12, so that the high-temperature alloy powder in the supplementary sheath 2 can enter the sheath body 1.

[0063] The angle formed between the upper wall 21 and the first side wall 22 is less than 90°, and the angle formed between the upper wall 21 and the second side wall 23 is less than 90°. That is, the upper wall 21 and the first side wall 22 are not perpendicular to each other, and the upper wall 21 and the second side wall 23 are not perpendicular to each other, wherein the angles formed between the upper wall 21 and the first side wall 22 and the second side wall 23 respectively can be the same or different. The first side wall 22 and the second side wall 23 inclined inwardly facilitate the flow of the high-temperature alloy powder. The upper wall 21 shrinks semi-freely during the hot pressing process, and the high-temperature alloy powder can be squeezed from the supplementary sleeve 2 into the sleeve body 1.

[0064] Based on the shrinkage behavior and organizational evolution of high-temperature alloy powder during hot isostatic pressing densification, the present invention provides a supplementary sleeve 2 to make the sleeve shrinkage process controllable during direct hot isostatic pressing near-net forming. When the sleeve body 1 shrinks and deforms during hot isostatic pressing, the high-temperature alloy powder in the supplementary sleeve 2 will flow into the sleeve body 1 under the action of gravity to reduce abnormal deformations such as pits and warping during the shrinkage of the sleeve body 1. That is, by providing the supplementary sleeve 2, the present invention can reduce the shrinkage of the sleeve body 1 and make the shrinkage of the sleeve body 1 more regular. Thereby increasing the number of finished product parts and reducing the production cost of the product.

[0065] The schematic diagram of the combined package shrinkage deformation after hot isostatic pressing is as follows Figure 3 shown. Figure 4 for Figure 3 A partial enlarged schematic diagram of Figure 3 and Figure 4It can be seen that after the supplementary sleeve 2 is provided, the shrinkage of the sleeve body 1 is reduced, the powder inside the supplementary sleeve 2 naturally flows into the interior of the sleeve under the action of gravity, and the shrinkage of the sleeve is obviously more regular.

[0066] Furthermore, the present invention can improve the utilization rate of high-temperature alloy powder, reduce the processing allowance of the blank after hot isostatic pressing, and reduce the production cost of alloy parts by providing the supplementary sleeve 2.

[0067] In some specific embodiments, the angle between the upper wall 21 and the first side wall 22 is 75° to 85°, including but not limited to any point value of 75°, 76°, 77°, 78°, 79°, 80°, 81°, 82°, 83°, 84°, 85° or any range value between two thereof. This facilitates the high-temperature alloy powder to enter the interior of the sheath body 1 from the supplementary sheath 2.

[0068] In some specific embodiments, the angle between the upper wall 21 and the second side wall 23 is 75° to 85°, including but not limited to any point value of 75°, 76°, 77°, 78°, 79°, 80°, 81°, 82°, 83°, 84°, and 85°, or a range of values ​​between any two of them. This facilitates the high-temperature alloy powder to enter the interior of the sheath body 1 from the supplementary sheath 2.

[0069] The inclination angle between the first side wall 22 and the second side wall 23 of the supplementary sleeve 2 is related to the fluidity of the high-temperature alloy powder, and a specific angle can be set according to the fluidity of the high-temperature alloy powder. For example, when the fluidity of the high-temperature alloy powder is relatively low, a larger angle (such as 75°) can be set, and when the fluidity of the high-temperature alloy powder is relatively high, a smaller angle (such as 85°) can be set.

[0070] In some specific embodiments, the wall thickness T of the first side wall 22 is 第一侧壁 and the wall thickness T of the sheath body 1 本体 Satisfies the following relationship: T 第一侧壁 =3.5~4T 本体 ; For example, T 第一侧壁 =3.5T 本体 , T 第一侧壁 =3.6T 本体 , T 第一侧壁 =3.7T 本体 , T 第一侧壁 =3.8T 本体 , T 第一侧壁 =3.9T 本体 or T 第一侧壁 =4T 本体 .

[0071] In some specific embodiments, the wall thickness T of the second side wall 23 is第二侧壁 and the wall thickness T of the sheath body 1 本体 Satisfies the following relationship: T 第二侧壁 =3.5~4T 本体 ; For example, T 第二侧壁 =3.5T 本体 , T 第二侧壁 =3.6T 本体 , T 第二侧壁 =3.7T 本体 , T 第二侧壁 =3.8T 本体 , T 第二侧壁 =3.9T 本体 or T 第二侧壁 =4T 本体 .

[0072] In some specific embodiments, the thickness T of the upper wall 21 is 上壁 and the wall thickness T of the sheath body 1 本体 Satisfies the following relationship: T 上壁 =0.5~1T 本体 For example, T 上壁 =0.5T 本体 , T 上壁 =0.6T 本体 , T 上壁 =0.7T 本体 , T 上壁 =0.8T 本体 , T 上壁 =0.9T 本体 or T 上壁 =T 本体 .

[0073] In the above three wall thickness relationship equations, 3.5~4 and 0.5~1 are correlation coefficients, which are related to the strength difference between the material of the supplementary sheath 2 and the material of the sheath body 1. The specific coefficient can be selected according to the specific situation. For example, when the strength difference between the material of the supplementary sheath 2 and the material of the sheath body 1 is large, a larger coefficient (such as 3.9 or 4) can be selected; when the strength difference between the material of the supplementary sheath 2 and the material of the sheath body 1 is small, a smaller coefficient (such as 3.5 or 3.6) can be selected.

[0074] In some specific embodiments, the number of the supplementary packages 2 is at least eight.

[0075] In some specific implementations, when there are multiple supplementary packages 2, the supplementary packages 2 are evenly distributed, or are arranged regularly.

[0076] In some specific embodiments, the number N of the supplementary packages 2 is 补充 Satisfies the following relationship: N补充 =K×S 本体上 ×V 本体 . Where K is the correlation coefficient, and K=1×10 -12 ~5×10 -12 Among them, S 本体上 is the upper surface area of ​​the package body 1 or the equivalent upper surface area, in mm 2 . V 本体 is the volume of the package body 1, in mm 3 It is understandable that K can be selected based on the shape characteristics and volume of the package body 1, or based on actual experience. K can be, for example, 1×10 -12 , 2×10 -12 , 3×10 -12 , 4×10 -12 or 5×10 -12 .

[0077] Through the above relationship, the number of supplementary sleeves 2 can be accurately predicted, which is beneficial to reducing the shrinkage of the sleeve body 1, making the shrinkage of the sleeve body 1 more regular, reducing the processing allowance of the blank after hot isostatic pressing, and reducing the production cost of powder high-temperature alloy parts.

[0078] It is understandable that the number of supplementary packages 2 can be determined by the above relationship, or can be set according to actual needs.

[0079] In some specific embodiments, the total volume of the supplementary package 2 (i.e., the sum of the volumes of several supplementary packages 2) V 补充 Satisfies the following relationship: V 补充 =h×V 本体 . Where h is the supplementary coefficient, h=0.02~0.2. V 本体 is the volume of the package body 1, in mm 3 It is understood that h can be selected based on the shape characteristics and volume of the package body 1, or can be selected based on actual experience. h can be, for example, 0.02, 0.03, 0.05, 0.08, 0.1, 0.12, 0.13, 0.15, 0.17 or 0.2.

[0080] Through the above relationship, the volume of the supplementary sleeve 2, that is, the amount of high-temperature alloy powder in the supplementary sleeve 2, can be determined, which is beneficial to reducing the shrinkage of the sleeve body 1, making the shrinkage of the sleeve body 1 more regular, reducing the processing allowance of the blank after hot isostatic pressing, reducing the production cost of powder high-temperature alloy parts, and improving the utilization rate of high-temperature alloy powder.

[0081] As an example, for an annular part with a diameter of 300~700mm and a height of 150~250mm, the maximum diameter of the supplementary sleeve 2 can be 48~52mm, the minimum diameter can be 37~42mm, and the height can be 28~32mm. The powder loading amount of the supplementary sleeve 2 (i.e., the mass of the high-temperature alloy powder in the supplementary sleeve 2) can be 0.3kg / piece~0.6kg / piece, the number of supplementary sleeves 2 can be 8~20, and the distribution of several supplementary sleeves 2 is uniformly distributed in the circumferential direction, but is not limited to this.

[0082] In some specific embodiments, the material of the supplementary sheath 2 has a higher strength at the hot isostatic pressing temperature than the material of the sheath body 1. This ensures that under high temperature and high pressure conditions, the strength of the supplementary sheath 2 is much greater than the strength of the sheath body 1 and maintains a good shape.

[0083] The specific material of the supplementary package 2 can be determined according to the material of the package body 1 .

[0084] In some specific implementations, the sheath body 1 is made of a material with good plasticity and easy processing. For example, the material of the sheath body 1 includes at least one of aluminum alloy, low carbon steel, rubber, glass and ceramic.

[0085] The supplementary sheath 2 is made of a material having a higher strength than the sheath body 1 at the hot isostatic pressing temperature.

[0086] In some specific implementations, when the material of the sheath body 1 is low carbon steel, the material of the supplementary sheath 2 includes S310S stainless steel.

[0087] In some specific implementations, when the material of the sheath body 1 is aluminum alloy, the material of the supplementary sheath 2 includes titanium alloy.

[0088] In some specific implementations, the inner surface of the supplementary sleeve 2 has a high temperature resistant coating; this can prevent the high temperature alloy powder from adhering to the supplementary sleeve 2 at high temperatures.

[0089] The high temperature resistant coating includes any coating commonly used in the art, such as silicate coating, phosphate coating, etc., but is not limited thereto.

[0090] The thickness of the high temperature resistant coating may be 150-250 μm, for example, 180 μm, 200 μm or 230 μm, but is not limited thereto.

[0091] In some specific embodiments, the inner surface of the supplementary sleeve 2 has a ceramic lining, such as alumina, zirconium oxide, silicon nitride, boron nitride or a mixture thereof; this can prevent the high-temperature alloy powder from adhering to the supplementary sleeve 2 at high temperatures.

[0092] The ceramic bushing is suitable for use when the thickness of the supplementary sleeve 2 is relatively large, and the thickness may be 0.2-2 mm.

[0093] In some specific implementations, during the hot isostatic pressing process, an iron core tooling is arranged in the middle of the baffle-like annular component sheath.

[0094] In some specific embodiments, high-temperature alloy powder is provided inside the sheath body 1 and the supplementary sheath 2, that is, the material holding space 24 and the cavity structure 11 contain high-temperature alloy powder, and the first side wall 22 and the second side wall 23 are respectively connected to the sheath body 1 by welding.

[0095] Before welding, a welding step is reserved between the supplementary sheath 2 and the sheath body 1 .

[0096] In some specific implementations, the welding method includes TIG welding, but is not limited thereto.

[0097] In the second aspect, the present invention provides a method for preparing a powder high-temperature alloy part, comprising the following steps: preparing a combined sleeve and performing a leak detection and cleaning process for the sleeve, respectively loading the high-temperature alloy powder into a sleeve body 1 and a supplementary sleeve 2 such as the combined sleeve, welding the combined sleeve (i.e., welding the sleeve body 1 and the supplementary sleeve 2) and detecting leaks, and performing hot isostatic pressing, and then removing the combined sleeve to obtain a blank. The blank is heat treated and blank processed, and the finished blank is then non-destructively tested to obtain the powder high-temperature alloy part. For a flow chart of the method for preparing a powder high-temperature alloy part, see Figure 5 The powder high temperature alloy part may be a powder high temperature alloy ring part, but is not limited thereto.

[0098] The method for preparing a powder high-temperature alloy part provided by the present invention can improve the utilization rate of the high-temperature alloy powder, reduce the blank processing allowance after hot isostatic pressing, and reduce the production cost of the powder high-temperature alloy part.

[0099] In terms of product production cost control, according to the current original package powder quantity of about 250kg, the original package price of about 12,000 yuan, and the high-temperature alloy powder price of about 300 yuan / kg, the total production cost of the original package plus powder is about 87,000 yuan. The optimized combined package of the present invention includes a package body 1 and a supplementary package 2, wherein the package body 1 is priced at about 10,000 yuan, the number of supplementary packages 2 is about 20, and each supplementary package 2 is filled with 0.5kg of powder, the total powder quantity of the supplementary package 2 is about 10kg, and the unit price of the supplementary package 2 is about 300 yuan. The production cost of the optimized combined package plus powder is about 83,800 yuan. The comprehensive calculation and comparison of the product production cost before and after the package optimization can save 3,200 yuan. It can be seen that the economic benefits achieved by the present invention are significant.

[0100] In addition, the above-mentioned preparation method adopts direct hot isostatic pressing (HIP) near-net forming, which has the advantages of high cost performance and the ability to realize the manufacturing of complex parts.

[0101] In some specific embodiments, the processing allowance of the blank is 3-7 mm, including but not limited to any point value of 3 mm, 4 mm, 5 mm, 6 mm, 7 mm or any range value between two of them. The preparation method provided by the present invention has a small blank processing allowance, which can be controlled within 3-7 mm, thereby significantly reducing the production cost of the alloy parts.

[0102] In some specific embodiments, the volume of the high temperature alloy powder in the supplementary package 2 is Σ 补充粉末 Satisfies the following relationship: 补充粉末 =N 补充 ×V 补充 Among them, N 补充 is the number of the supplementary packages 2. 补充 is the volume of the supplementary package 2, in mm 3 .

[0103] In some specific implementations, the method for preparing the high-temperature alloy powder includes: preparing a master alloy rod by using a vacuum horizontal continuous casting technology, and then powdering the master alloy rod and performing powder treatment to obtain the high-temperature alloy powder.

[0104] The traditional vacuum induction melting technology (VIM) for directly casting electrode rods has the following disadvantages: shrinkage defects are prone to occur in the center of the electrode, and due to the top casting method, large-sized inclusions floating on the surface during the smelting process inevitably enter the electrode, resulting in low cleanliness. The present invention adopts vacuum horizontal continuous casting technology (VHCC) to prepare master alloy rods. VHCC adopts bottom steel tapping and water-cooled copper crystallizer, avoiding secondary pollution caused by non-metallic materials such as pouring troughs, filters, and insulation cotton required by traditional die casting processes, which can significantly reduce the number of inclusions in the ingot and improve the cleanliness of powder high-temperature alloy baffle ring parts from the source. In addition, the use of vacuum horizontal continuous casting technology can avoid the problem of shrinkage defects in the center of the electrode in vacuum induction melting.

[0105] The present invention has achieved remarkable results in terms of cleanliness control. The O+N content (i.e., the sum of the oxygen content and the nitrogen content) in the master alloy rod prepared by the vacuum horizontal continuous casting technology can be controlled within 15ppm, and the inclusion content is reduced by more than 50% compared with the vacuum induction melting die casting rod. After the VHCC master alloy rod is pulverized, the number of inclusions in the finished powder is ≤10 particles / kg.

[0106] In some specific embodiments, the powder making method includes at least one of plasma rotating electrode atomization powder making and argon gas atomization powder making.

[0107] In some specific embodiments, the powder processing method includes at least one of electrostatics, screening and powder mixing.

[0108] In some specific implementations, there is no order between the steps of preparing the combined casing and the steps of preparing the high-temperature alloy powder, and they can be arranged accordingly.

[0109] In some specific embodiments, the sum of the oxygen and nitrogen contents in the master alloy bar is ≤15ppm, including but not limited to any one of 15ppm, 13ppm, 12ppm, 10ppm, 8ppm, 5ppm or a range between any two of them.

[0110] In some specific embodiments, the number of inclusions in the high-temperature alloy powder is ≤10 particles / kg, including but not limited to any point value of 10 particles / kg, 10 particles / kg, 8 particles / kg, 5 particles / kg, or a range value between any two of them.

[0111] In some specific implementations, the method for removing the combined package includes at least one of a mechanical processing method and a chemical etching method; the present invention is not limited to this.

[0112] In some specific embodiments, the high temperature alloy powder includes nickel-based high temperature alloy powder. The preparation method provided by the present invention can produce nickel-based powder high temperature alloy complex parts.

[0113] In some specific embodiments, the nickel-based high-temperature alloy powder includes at least one of FGH4095, FGH4096, FGH4097, FGH4098, FGH4099 and FGH4091, but is not limited thereto.

[0114] In some specific implementations, the powder high temperature alloy part includes at least one of a powder high temperature alloy ring part, a powder high temperature alloy cylindrical part, and a powder high temperature alloy square part.

[0115] That is, the combined package sleeve provided by the present invention is not only suitable for annular parts, but also suitable for cylindrical parts, square parts, etc.

[0116] In some specific embodiments, the powder high-temperature alloy annular parts include but are not limited to baffles (front baffles and rear baffles) for aircraft engines, sealing plates, baffle rings, etc.

[0117] The present invention generally adopts vacuum horizontal continuous casting technology (VHCC) + plasma rotating electrode atomization powder making (PREP) or argon atomization powder making (AA) + hot isostatic pressing (HIP) near-net forming + heat treatment process (HT) to prepare powder high-temperature alloy baffle-type ring parts.

[0118] In some specific embodiments, the heat treatment process includes solution treatment and aging treatment. The solution treatment system is to heat the steel at 1130-1170°C for 1-2 hours, followed by air cooling, salt quenching or oil quenching. The aging system can be selected as primary aging, secondary aging or tertiary aging according to the needs. For example, the aging treatment system is to heat the steel at 860-880°C for 1-2 hours, followed by air cooling; and heat the steel at 640-660°C for 24 hours, followed by air cooling.

[0119] In some specific implementations, the temperature of the hot isostatic pressing treatment is 1160-1210° C., the pressure is not less than 120 MPa, and the heat preservation and pressure holding time is not less than 2 hours.

[0120] In the present invention, the volume of the original sheath is V, the volume of the optimized sheath body is about (0.7-0.8)V, and the total volume of the supplementary sheath 2 is about (0.1-0.2)V. The present invention can save about (0.1-0.2)V of metal powder.

[0121] In a third aspect, the present invention provides an application of the method for preparing the combined casing or the powder high-temperature alloy part in the aerospace field.

[0122] The combined sleeve and the method for preparing the powder high-temperature alloy parts provided by the present invention significantly improve the utilization rate of the powder, reduce the production cost of parts such as baffle ring parts, and provide an ultra-clean, low-cost, process-controllable and high-reliability (reliable quality) solution for the manufacture of parts such as baffle ring parts of aircraft engines, which can meet the mass production needs of more models of aircraft engines or other parts, and can also be promoted and applied in more other fields such as gas turbines.

[0123] 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.

[0124] Example 1

[0125] The purpose of this embodiment 1 is to obtain a circular ring-shaped product with an inner diameter of 525 mm, an outer diameter of 660 mm, and a height of 234 mm.

[0126] The method for preparing the powder high-temperature alloy ring provided in this embodiment includes the following steps:

[0127] (1) The master alloy rods were prepared by vacuum horizontal continuous casting (VHCC), and the master alloy rods were atomized and pulverized by plasma rotating electrode method (PREP), and then powdered by electrostatic, screening and powder mixing processes to obtain FGH4095 nickel-based high temperature alloy powder. The process parameters for preparing FGH4095 master alloy by VHCC are as follows: the casting speed in the initial casting stage is 1m / min, the cooling rate is 4℃ / mm, and the initial casting temperature is 100℃ higher than the melting point.

[0128] (2) Make a combined package and perform leak detection and cleaning procedures on the package.

[0129] The combined package includes a package body 1 and a plurality of supplementary packages 2, all of which are located above the package body 1 and are evenly distributed. The supplementary package 2 includes an upper wall 21, a first side wall 22 and a second side wall 23 (the two have the same thickness, collectively referred to as side walls), and the upper wall 21 and the side walls together form a material storage space 24. The package body 1 has a cavity structure 11, and the top of the package body 1 has an opening 12. The bottom end of the side wall is connected to the top of the package body 1, and the material storage space 24 and the cavity structure 11 are connected through the opening 12.

[0130] The included angle between the upper wall 21 and the side wall is 80°.

[0131] The wall thickness T of the package body 1 本体 The side wall thickness is 10 mm. 侧壁 and the wall thickness T of the sheath body 1 本体 Meet T 侧壁 =3.5T 本体 =35mm; thickness T of upper wall 21 上壁 and the wall thickness T of the sheath body 1 本体 Meet T 上壁 =0.5T 本体 =5mm.

[0132] The upper surface area S of the package body 1 本体上 2.0×10 5 mm 2 , the volume V of the package body 1 本体 5.9×10 7 mm 3 . Number of refill sets 2 N 补充 Satisfy N 补充 =K×S 本体上 ×V 本体 =20, where K is 1.6×10 -12 The total volume V of the supplementary package 2 补充 Meet V 补充 =h×V 本体 / N 补充 =6×10 6mm 3 , where h is 0.11.

[0133] The material of the package body 1 is low carbon steel, and the material of the supplementary package 2 is S310S stainless steel.

[0134] (3) The high-temperature alloy powder is loaded into the package body 1 and the supplementary package 2 of the combined package respectively, and the combined package is welded and leak-checked. The side wall is connected to the package body 1 by TIG welding. The volume of the high-temperature alloy powder in the supplementary package 2 is Σ 补充粉末 Satisfy Σ 补充粉末 =N 补充 ×V 补充 =6×10 6 mm 3 . Then hot isostatic pressing is carried out, the hot isostatic pressing temperature is 1180℃, the pressure is 140MPa, and the heat preservation and pressure holding time is 2h. The central hole gap of the sleeve is matched with an iron core, and the iron core is solid. After the hot isostatic pressing treatment is completed, the combined sleeve is removed by mechanical processing to obtain the blank. The blank is heat treated and the finished blank of the baffle ring is processed to obtain the FGH4095 alloy front baffle ring. The heat treatment process includes solution treatment and aging treatment. The solution treatment system is to heat treat at 1150℃ for 2h, and then quench in salt or oil. The aging treatment system is: heat treat at 870℃ for 1.5h, and then air cool; then heat treat at 650℃ for 24h, and then air cool.

[0135] Example 2

[0136] This embodiment is to obtain a cylindrical product with a diameter of 328 mm and a height of 237 mm.

[0137] The method for preparing a powder high-temperature alloy part provided in this embodiment comprises the following steps:

[0138] (1) A master alloy rod is prepared by vacuum horizontal continuous casting technology (VHCC), and the master alloy rod is powdered by argon atomization method (AA), and then powdered by electrostatic, screening and powder mixing steps to obtain FGH4095 nickel-based high temperature alloy powder. The VHCC process parameters are the same as those in Example 1.

[0139] (2) Make a combined package and perform leak detection and cleaning procedures on the package.

[0140] The combined package includes a package body 1 and a plurality of supplementary packages 2, all of which are located above the package body 1 and are evenly distributed. The supplementary package 2 includes an upper wall 21 and a first side wall 22 and a second side wall 23 connected to the upper wall 21 (the two have the same thickness and are collectively referred to as side walls), and the upper wall 21 and the side walls together form a material storage space 24. The package body 1 has a cavity structure 11, and the top of the package body 1 has an opening 12. The bottom end of the side wall is connected to the top of the package body 1, and the material storage space 24 and the cavity structure 11 are connected through the opening 12.

[0141] The angle between the upper wall 21 and the side wall is 85°; the angle design can be selected according to the different fluidity of the powder. The fluidity of AA powder is slightly lower than that of PREP powder. Therefore, the angle of this embodiment is increased, and the relative wall thickness of the supplementary sleeve 2 is increased.

[0142] The wall thickness T of the package body 1 本体 The side wall thickness is 6mm. 侧壁 and the wall thickness T of the sheath body 1 本体 Meet T 侧壁 =4T 本体 =24mm; the wall thickness T of the upper wall 21 上壁 and the wall thickness T of the sheath body 1 本体 Meet T 上壁 =T 本体 =6mm.

[0143] The upper surface area S of the package body 1 本体上 1.4×10 5 mm 2 , the volume V of the package body 1 本体 4.2×10 7 mm 3 . Number of refill sets 2 N 补充 Satisfy N 补充 =K×S 本体上 ×V 本体 =13, where K is 2×10 -12 The total volume V of the supplementary package 2 补充 Meet V 补充 =h×V 本体 / N 补充 =4×10 6 mm 3 , where h is 0.1.

[0144] The material of the package body 1 is low carbon steel, and the material of the supplementary package 2 is S310S stainless steel.

[0145] (3) The high-temperature alloy powder is loaded into the package body 1 and the supplementary package 2 of the combined package respectively, and the combined package is welded and leak-checked. The side wall is connected to the package body 1 by TIG welding. The volume of the high-temperature alloy powder in the supplementary package 2 is Σ 补充粉末 Satisfy Σ 补充粉末 =N 补充 ×V 补充 =4.2×10 6 mm 3 . Then hot isostatic pressing is carried out, and the hot isostatic pressing temperature is 1180°C, the pressure is 140MPa, and the heat preservation and pressure holding time is 3h. The sheath is cylindrical. After the hot isostatic pressing treatment is completed, the combined sheath is removed by mechanical processing to obtain a blank. The blank is heat treated and processed into a cylindrical finished blank to obtain a FGH4095 alloy cylindrical part. The heat treatment process includes solution treatment and aging treatment. The solution treatment system is to heat treat at 1150°C for 3h, and then quench in salt or oil. The aging treatment system is to heat treat at 870°C for 1.5h, and then air cool; then heat treat at 650°C for 24h, and then air cool.

[0146] Example 3

[0147] This embodiment is to obtain a circular ring-shaped product with an inner diameter of 525 mm, an outer diameter of 660 mm, and a height of 234 mm.

[0148] The preparation method of the powder high-temperature alloy part provided in this embodiment is basically the same as that in Embodiment 1, except that the number of the supplementary sleeves 2 is different. In this embodiment 3, the number of the supplementary sleeves 2 is 36.

[0149] That is, in this embodiment: the wall thickness T of the package body 1 is 本体 The side wall thickness is 10 mm. 侧壁 and the wall thickness T of the sheath body 1 本体 Meet T 侧壁 =4T 本体 =40mm; the wall thickness T of the upper wall 21 上壁 and the wall thickness T of the sheath body 1 本体 Meet T 上壁 =T 本体 =10mm.

[0150] The upper surface area S of the package body 1 本体上 2.0×10 5 mm 2 , the volume V of the package body 1 本体 5.9×10 7 mm 3 . Number of refill sets 2 N 补充 Satisfy N 补充 =K×S 本体上 ×V本体 =36, where K is 3×10 -12 The total volume V of the supplementary package 2 补充 Meet V 补充 =h×V 本体 / N 补充 =7.2×10 6 mm 3 , where h is 0.2.

[0151] Example 4

[0152] This embodiment is to obtain a cylindrical product with a diameter of 328 mm and a height of 237 mm.

[0153] The method for preparing the powder high-temperature alloy part provided in this embodiment is basically the same as that in Embodiment 2, except that in step (2), the number of supplementary packages 2 is 26.

[0154] That is, in this embodiment: the wall thickness T of the package body 1 is 本体 The side wall thickness is 6mm. 侧壁 and the wall thickness T of the sheath body 1 本体 Meet T 侧壁 =4T 本体 =24mm; the wall thickness T of the upper wall 21 上壁 and the wall thickness T of the sheath body 1 本体 Meet T 上壁 =T 本体 =6mm.

[0155] The upper surface area S of the package body 1 本体上 1.4×10 5 mm 2 , the volume V of the package body 1 本体 4.2×10 7 mm 3 . Number of refill sets 2 N 补充 Satisfy N 补充 =K×S 本体上 ×V 本体 =24, where K is 4×10 -12 The total volume V of the supplementary package 2 补充 Meet V 补充 =h×V 本体 / N 补充 =6×10 6 mm 3 , where h is 0.15.

[0156] Example 5

[0157] The preparation method of the powder high-temperature alloy part provided in this embodiment is basically the same as that in Example 1, except that: in step (1), FGH4097 nickel-based high-temperature alloy powder is prepared, wherein the process parameters for preparing FGH4097 master alloy by VHCC are: the casting speed in the initial casting stage is 0.8 m / min, the cooling rate is 3°C / mm, and the initial casting temperature is 150°C higher than the melting point; and in step (3), the hot isostatic pressing temperature of the FGH4097 alloy ring part is 1200°C, the solution treatment system is heat preservation treatment at 1200°C for 3 hours, followed by air cooling, and the aging treatment system is heat preservation treatment at 910°C for 3 hours, followed by air cooling; then heat preservation treatment at 750°C for 8 hours, followed by air cooling; finally heat preservation treatment at 700°C for 16 hours, followed by air cooling.

[0158] Example 6

[0159] The preparation method of the powder high-temperature alloy part provided in this embodiment is basically the same as that in Embodiment 1, except that, in step (2), the inner surface of each supplementary package 2 has a phosphate high-temperature resistant coating with a thickness of 200 μm.

[0160] Comparative Example 1

[0161] This comparative example is to obtain a circular ring-shaped product with an inner diameter of 525 mm, an outer diameter of 660 mm, and a height of 234 mm.

[0162] The preparation method of the powder high-temperature alloy part provided in this comparative example is basically the same as that of Example 1, except that in step (2), no supplementary sheath 2 is made and in step (3), no welding is performed. Instead, a circular sheath is directly used for hot isostatic pressing to obtain a part of target size.

[0163] The dimensions of the sheath body 1 of the combined sheath used in Example 1 for preparing FGH4095 alloy front baffle-like annular parts and the sheath used in Comparative Example 1 for preparing FGH4095 alloy front baffle-like annular parts before and after shrinkage (i.e. before and after hot isostatic pressing treatment) are shown in Table 1.

[0164] Table 1 Comparison of dimensions of the package body 1 of Example 1 and the package body 1 of Comparative Example 1 before and after shrinkage

[0165]

[0166] It can be seen from Table 1 that the shrinkage of the sheath body 1 of Example 1 is significantly lower than that of the sheath in Comparative Example 1. The combined sheath in Example 1 uses a smaller volume of sheath to obtain a product of the same size as that of Comparative Example 1, which significantly saves powder material.

[0167] Comparative Example 2

[0168] This comparative example is to obtain a cylindrical product with a diameter of 328 mm and a height of 237 mm.

[0169] The preparation method of the powder high-temperature alloy part provided in this comparative example is basically the same as that of Example 2, except that in step (2), no supplementary sheath 2 is made and in step (3), no welding is performed. Instead, a cylindrical sheath is directly used for hot isostatic pressing to obtain a part of target size.

[0170] The dimensions of the sheath body 1 of the combined sheath used in Example 2 for preparing FGH4095 alloy front baffle-like annular parts and the sheath used in Comparative Example 2 for preparing FGH4095 alloy front baffle-like annular parts before and after shrinkage (i.e. before and after hot isostatic pressing treatment) are shown in Table 2.

[0171] Table 2 Comparison of dimensions of package body 1 in Example 2 and package body 2 in Comparative Example before and after shrinkage

[0172]

[0173] Furthermore, the shrinkage of the sheath body 1 or the sheath obtained in each embodiment and each comparative example, the utilization rate of the high-temperature alloy powder in each embodiment and each comparative example, the machining allowance of the blank obtained in each embodiment and each comparative example, the sum of the oxygen and nitrogen contents in the master alloy rod obtained in each embodiment and each comparative example (abbreviated as O+N content), and the number of inclusions in the high-temperature alloy powder obtained in each embodiment and each comparative example are shown in Table 3.

[0174] Table 3 Performance indicators

[0175]

[0176] It can be seen from Table 1 that, compared with the comparative examples, the shrinkage of the sheath body 1 of each embodiment is lower, the utilization rate of the high-temperature alloy powder is higher, and the processing allowance of the blank is lower. This shows that the present invention can reduce the shrinkage of the sheath body 1, reduce the processing allowance of the blank after hot isostatic pressing, and improve the utilization rate of the high-temperature alloy powder by providing a supplementary sheath 2 and optimizing parameters such as the position, quantity, and size of the supplementary sheath 2.

[0177] In addition, the sum of the oxygen and nitrogen contents in the master alloy bars prepared in each embodiment is low, and the number of inclusions in the high-temperature alloy powder is small. This shows that the preparation method of the powder high-temperature alloy part provided by the present invention can reduce the O+N content in the alloy bar, reduce the number of inclusions in the ingot, and improve the cleanliness of the powder high-temperature alloy part by adopting the vacuum horizontal continuous casting technology (VHCC). Among them, the O+N content in the master alloy bar is ≤15ppm, and the number of inclusions in the high-temperature alloy powder is ≤10 particles / kg, indicating that the material is qualified.

[0178] 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. A combination package, characterized in that: The combined sheath is used for hot isostatic pressing, and the combined sheath comprises a sheath body and at least one supplementary sheath located above the sheath body; The supplementary package comprises an upper wall and a first side wall and a second side wall respectively connected to both ends of the upper wall, wherein the upper wall, the first side wall and the second side wall together form a material holding space; The package body has a cavity structure, and the top end of the package body has an opening; The bottom end of the first side wall and the bottom end of the second side wall are respectively connected to the top end of the package body, and the material holding space and the cavity structure are connected through the opening; An included angle between the upper wall and the first side wall is less than 90°, and an included angle between the upper wall and the second side wall is less than 90°.

2. The combined package according to claim 1, characterized in that: At least one of the following conditions is met: (1) The angle between the upper wall and the first side wall is 75° to 85°; (2) The angle between the upper wall and the second side wall is 75° to 85°.

3. The combined package according to claim 1, characterized in that: At least one of the following conditions is met: (1) The thickness of the first side wall is T 第一侧壁 and the package body T 本体 The wall thickness satisfies the following relationship: 第一侧壁 =3.5~4T 本体 ; (2) The thickness of the second side wall T 第二侧壁 and the package body T 本体 The wall thickness satisfies the following relationship: 第二侧壁 =3.5~4T 本体 ; (3) The thickness of the upper wall T 上壁 and the package body T 本体 The wall thickness satisfies the following relationship: 上壁 =0.5~1T 本体 .

4. The combined package according to claim 1, characterized in that: At least one of the following conditions is met: (1) The number of the refill packages is at least eight; (2) The number of supplementary packages N 补充 Satisfies the following relationship: N 补充 =K×S 本体上 ×V 本体 ; Where K is the correlation coefficient, K=1×10 -12 ~5×10 -12 ; S 本体上 is the upper surface area of ​​the package body or the equivalent upper surface area, in mm 2 ; V 本体 is the volume of the package body, in mm 3 ; (3) The total volume V of the supplementary package 补充 Satisfies the following relationship: V 补充 =h×V 本体 ; Where h is the supplementary coefficient, h=0.02~0.2; V 本体 is the volume of the package body, in mm 3 .

5. The combined package according to claim 1, characterized in that: At least one of the following conditions is met: (1) The strength of the material of the supplementary sheath at the hot isostatic pressing temperature is higher than the strength of the material of the sheath body at the hot isostatic pressing temperature; (2) The material of the package body includes at least one of aluminum alloy, low carbon steel, rubber, glass and ceramic; (3) When the material of the sheath body is low carbon steel, the material of the supplementary sheath includes S310S stainless steel; (4) When the material of the sheath body is aluminum alloy, the material of the supplementary sheath includes titanium alloy; (5) The inner surface of the supplementary package has a high temperature resistant coating; (6) The inner surface of the supplementary sleeve has a ceramic lining; (7) High-temperature alloy powder is disposed inside the sheath body and the supplementary sheath, and the first side wall and the second side wall are connected to the sheath body by welding.

6. A method for preparing a powder high temperature alloy part, characterized in that: The steps include: The high-temperature alloy powder is respectively loaded into the sheath body and the supplementary sheath of the combined sheath as claimed in any one of claims 1 to 5, and hot isostatic pressing is performed, and then the combined sheath is removed to obtain a blank; the blank is heat-treated and processed to obtain the powder high-temperature alloy part.

7. The method for preparing a powder high temperature alloy part according to claim 6, characterized in that: At least one of the following conditions is met: (1) The machining allowance of the blank is 3-7 mm; (2) The volume of the high temperature alloy powder in the supplementary package Σ 补充粉末 Satisfies the following relationship: 补充粉末 =N 补充 ×V 补充 ; Among them, N 补充 V is the number of the supplementary packages; 补充 is the volume of the supplementary package, in mm 3 .

8. The method for preparing a powder high temperature alloy part according to claim 6, characterized in that: The method for preparing the high-temperature alloy powder comprises: preparing a master alloy rod by vacuum horizontal continuous casting technology, and then powdering the master alloy rod and performing powder treatment to obtain the high-temperature alloy powder; Wherein, the sum of the contents of oxygen and nitrogen in the master alloy bar is ≤15ppm; and / or the number of inclusions in the high-temperature alloy powder is ≤10 particles / kg.

9. The method for preparing a powder high temperature alloy part according to claim 6, characterized in that: At least one of the following conditions is met: (1) The high temperature alloy powder includes nickel-based high temperature alloy powder; (2) The powder high temperature alloy part includes at least one of a powder high temperature alloy ring part, a powder high temperature alloy cylindrical part and a powder high temperature alloy square part.

10. Application of the combined package as claimed in any one of claims 1 to 5 or the method for preparing the powder high temperature alloy part as claimed in any one of claims 6 to 9 in the field of aerospace.

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