Method for preparing Ti-Pd alloy by fully returning furnace charge

Abstract

The invention relates to a method for preparing a Ti-Pd alloy by fully returning furnace charge, which comprises the following steps: selecting a corresponding type of Ti-Pd alloy residual material to prepare the regenerated Ti-Pd alloy according to the type of the regenerated Ti-Pd alloy to be prepared; in the preparation process, selected Ti-Pd alloy residues are bundled into electrodes; in the electrode bundling process, a plurality of titanium-oxygen bags are evenly added at intervals, the titanium-oxygen bags are located at different positions in the electrodes respectively, the prepared and formed titanium-oxygen bags and adjacent defective materials are fixed together in a spot welding mode, and the titanium-oxygen bags are prevented from moving, scattering and stacking; according to the invention, a plurality of titanium oxygen bags are uniformly arranged in the electrode, so that the addition amount of TiO2 can be effectively and accurately controlled, the situation that the oxygen bags are not broken and scattered in the binding and transporting process of the electrode can be effectively ensured, meanwhile, the situation that the oxygen is gathered and the oxygen is not uniformly distributed in the VAR smelting process can also be ensured, and the two are effectively combined to realize '1 + 1gt; 2, the content of oxygen in the Ti-Pd alloy can be further controlled more accurately, and it is guaranteed that chemical components of the regenerated Ti-Pd alloy are consistent with design expectation.

Description

Technical Field

[0001] The invention relates to the technical field of titanium alloys, and in particular to a method for preparing a Ti-Pd alloy using full return furnace charge. Technical Background

[0002] Ti-Pd titanium alloy belongs to ɑ-type titanium alloy, which is formed by adding a small amount of metal palladium to industrial pure titanium. The addition of palladium not only improves the corrosion resistance of Ti-Pd alloy in reducing media, but also improves its corrosion resistance in oxidizing media. Compared with titanium, Ti-Pd alloy has better resistance to crevice corrosion. The Pd element exhibits a cathodic effect to a certain extent, which can change the anodizing characteristics of Ti and is an excellent alloying element for titanium.

[0003] Palladium is soft, easily deformed, and has good ductility and plasticity. Palladium is an indispensable material in high-tech fields such as aerospace, deep-sea diving, and weapons. Since palladium is a non-renewable resource and is expensive, the recycling and reuse of Ti-Pd alloy is particularly important, which is also the focus and difficulty in the field of engineering applications.

[0004] In the field of waste recycling to create green production capacity, it has always been a focus and difficulty that has attracted much attention. The classification of waste is rich and varied, including chip-shaped waste and block-shaped waste such as risers and side strips. The processing procedures of titanium and titanium alloys are numerous and complex, and the product yield rate is low. Recycling and reusing block-shaped waste such as risers and side strips can save more space resources, create more economic benefits, and realize the re-output of green production capacity.

[0005] Ti-Pd alloys can be divided into two types of titanium alloys, TA8 and TA9, according to the different amounts of metal palladium added. Further subdivided according to the oxygen content, there are four types of titanium alloys, TA8, TA8-1, TA9, and TA9-1. In the design process of recycled Ti-Pd alloys, how to accurately control the oxygen content is not only a difficult point in component design, but also a focal point of recycled materials. Summary of the invention

[0006] The purpose of the present invention is to provide a method for preparing Ti-Pd alloy with full return charge, by placing titanium oxide bags at different positions in the electrode, so as to achieve the purpose of accurately controlling the oxygen content, thereby making the chemical composition of the recycled titanium-palladium alloy meet relevant standards and be uniform.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] The present invention provides a method for preparing a Ti-Pd alloy by fully returning the charge, comprising the following steps:

[0009] S1. Classify and recycle Ti-Pd alloy residues, wherein the Ti-Pd alloy residues include two types of titanium alloys, Ti-0.05Pd and Ti-0.2Pd. According to the different oxygen contents, the Ti-0.05Pd titanium alloy residues are classified into two types of titanium alloys, TA8 and TA8-1. The Ti-0.2Pd titanium alloy residues are classified into two types of titanium alloys, TA9 and TA9-1. Finally, the TA8, TA8-1, TA9 and TA9-1 titanium alloy residues are pretreated respectively.

[0010] S2. According to the type of the regenerated Ti-Pd alloy to be prepared, select the corresponding type of pretreated Ti-Pd alloy residue, and prepare the regenerated Ti-Pd alloy through the selected Ti-Pd alloy residue.

[0011] Preferably, in S2, when the type of the regenerated Ti-Pd alloy is TA8 titanium alloy, the pretreated TA8-1 scrap is selected as the raw material for the regenerated Ti-Pd alloy, or the pretreated TA8 scrap and TA8-1 scrap are selected as the raw materials for the regenerated Ti-Pd alloy;

[0012] When the type of the regenerated Ti-Pd alloy is TA9, the pretreated TA9-1 scrap is selected as the raw material for the regenerated Ti-Pd alloy, or the pretreated TA9 scrap and TA9-1 scrap are selected as the raw materials for the regenerated Ti-Pd alloy.

[0013] Preferably, the step of preparing the regenerated Ti-Pd alloy in S2 comprises:

[0014] S201, weighing the selected pretreated Ti-Pd alloy residue according to the amount;

[0015] S202, weighing TiO2 powder according to amount, and preparing the TiO2 powder into a plurality of titanium oxide bags;

[0016] S203, bundling the weighed Ti-Pd alloy scraps into electrodes; in the process of bundling the electrodes, adding a plurality of prepared titanium oxide packages at even intervals, so that the plurality of prepared titanium oxide packages are respectively located at different positions in the electrode, and spot welding the prepared titanium oxide packages to the adjacent scraps to fix them together to prevent the titanium oxide packages from moving, scattering and accumulating.

[0017] S204, subjecting the bundled electrodes to vacuum self-smelting twice to form a regenerated Ti-Pd alloy.

[0018] Preferably, in S202, the preparation method of the titanium oxide bag is: the weighed TiO2 powder is divided into multiple portions, each portion of the TiO2 powder is first sealed and wrapped with special TiO2 paper to make a preform, and then each preform is sealed and wrapped with titanium tape.

[0019] Preferably, in S203, during the electrode bundling process, the titanium oxide package is laid in three layers in the electrode, and the three layers of titanium oxide package are respectively placed at 1 / 4 depth, 1 / 2 depth and 3 / 4 depth of the electrode, and each layer is evenly placed in 2 to 4 rows, and each row has 8 to 12 evenly spaced packages along the length direction of the electrode.

[0020] Preferably, the process of pretreating each type of Ti-Pd alloy residue in S1 is:

[0021] Clean the oil and impurities on the surface of Ti-Pd alloy residue;

[0022] Separately store the risers, plate head and tail edges, and edge strips in each type of Ti-Pd alloy residue;

[0023] Cut the risers, head and tail edge materials, and edge strip materials;

[0024] Preferably, the titanium strip used is made of one of TA1 or TA2 pure titanium, the thickness of the titanium strip is 0.1-1 mm, and the TiO2 special paper is tracing paper.

[0025] Preferably, the electrode is cylindrical, with a diameter of 500-550 mm, a length of 3000-5600 mm, and a mass of 2-4 t.

[0026] Preferably, the material of the strap used for bundling the electrodes is Ti-Pd alloy or pure titanium.

[0027] Preferably, during the vacuum consumable smelting process, during the second smelting, the electrode is turned around and smelted in reverse direction.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] (1) Pd metal is a non-renewable metal and is expensive. The present invention can recycle various risers and various edge strips of Ti-Pd alloy, thereby achieving green benefits of recycled Ti-Pd alloy.

[0030] (2) The present invention prepares TiO2 powder into a plurality of "titanium oxide bags" that are not easy to break, and evenly arranges the plurality of titanium oxide bags inside the electrode, which can effectively and accurately control the amount of TiO2 added, and effectively ensure that the oxygen bags will not break or scatter during the electrode bundling and transportation process, and at the same time ensure that oxygen aggregation and uneven oxygen distribution will not occur during the VAR smelting process. The effective combination of the two realizes "1+1>2", which can further and more accurately control the oxygen content in the Ti-Pd alloy and ensure that the chemical composition of the regenerated Ti-Pd alloy is consistent with the design expectations.

[0031] (4) The present invention uses VAR for two U-turn smeltings, which further promotes the homogenization of the recycled Ti-Pd alloy, so that its chemical composition conforms to GB / T3620 "Titanium and Titanium Alloy Grades and Chemical Compositions". The performance of the plate produced by the present invention conforms to GB / T3621 "Titanium and Titanium Alloy Plates" and has good plasticity and toughness, which can meet the practical application of large-scale engineering. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 Schematic diagram of the electrode structure of the present invention;

[0033] Figure 2 Schematic diagram of titanium oxide cloth in the electrode bundling process of the present invention;

[0034] Figure 3 A schematic diagram of sampling chemical components at three points on the cross section of the electrode of the present invention;

[0035] Figure numerals: 1, cable tie, 2, 1 / 4 depth, 3, 1 / 2 depth, 4, 3 / 4 depth. Specific embodiments

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] The present invention provides a method for preparing a Ti-Pd alloy by fully returning furnace charge, wherein Ti-Pd alloy residues are first classified and recycled, and the corresponding type of pretreated Ti-Pd alloy residues are selected according to the type of the regenerated Ti-Pd alloy to be prepared, and the regenerated Ti-Pd alloy is prepared by the selected Ti-Pd alloy residues, so as to realize the recycling of various risers and various edge strips of the Ti-Pd alloy, and realize the green creation of the regenerated Ti-Pd alloy, wherein the Ti-Pd alloy residues can be divided into two types of titanium alloys, Ti-0.05Pd and Ti-0.2Pd, according to different amounts of metal palladium added, and the Ti-0.05Pd titanium alloy residues can be further divided into two types of titanium alloys, TA8 and TA8-1, according to different oxygen contents, and the Ti-0.2Pd titanium alloy residues can be further divided into two types of titanium alloys, TA9 and TA9-1, and finally the TA8, TA8-1, TA9 and TA9-1 titanium alloy residues are pretreated respectively;

[0038] When preparing a regenerated Ti-Pd alloy with a high oxygen content from a Ti-Pd alloy residue with a low oxygen content, TiO2 needs to be added so that the oxygen content of the regenerated Ti-Pd alloy is consistent with the design expectation, for example:

[0039] When the type of the recycled Ti-Pd alloy is TA8 titanium alloy, when the pretreated TA8-1 scrap is selected as the raw material for the recycled Ti-Pd alloy or when the pretreated TA8 scrap and TA8-1 scrap are selected as the raw materials for the recycled Ti-Pd alloy, TiO2 needs to be added during the smelting process;

[0040] When the type of the recycled Ti-Pd alloy is TA9 titanium alloy, the pretreated TA9-1 scrap is selected as the raw material for the recycled Ti-Pd alloy, or the pretreated TA9 scrap and TA9-1 scrap are selected as the raw materials for the recycled Ti-Pd alloy. TiO2 also needs to be added during the smelting process.

[0041] Example 1

[0042] This embodiment proposes a method for preparing Ti-Pd alloy with full return charge, the design goal of which is to prepare 2.3t recycled TA8 titanium alloy ingot, comprising the following steps:

[0043] S1. Ti-Pd alloy residues are classified and recycled according to four types of titanium alloys: TA8, TA8-1, TA9, and TA9-1, and each type of Ti-Pd alloy residue is pretreated;

[0044] S2, using TA8-1 scrap as raw material to prepare recycled TA8 titanium alloy, the specific steps are:

[0045] S201, weighing 2295 kg of pretreated TA8-1 residue;

[0046] S202. Weigh 5 kg of TiO2 powder, divide the weighed TiO2 powder into 48 equal portions, first seal and wrap each portion of TiO2 powder with special TiO2 paper to make a preform, and then seal and wrap each preform with a 0.1 mm thick titanium tape to make 48 titanium oxide bags.

[0047] S203, reference Figure 1 and Figure 2 , the weighed TA8-1 waste material is bundled into an electrode; in the process of bundling the electrode, 48 titanium oxide packages are added to the inside of the electrode at intervals, so that the titanium oxide packages are laid in three layers in the electrode, and the three layers of titanium oxide packages are placed at 1 / 4 depth 2, 1 / 2 depth 3 and 3 / 4 depth 4 of the electrode respectively, and each layer is evenly placed in 2 rows, and each row has 8 evenly spaced packages along the length direction of the electrode. The bundled electrode is cylindrical, with a diameter of about 520 mm and a length of about 3600 mm. The material of the strap 1 used for bundling the electrode is Ti-Pd alloy;

[0048] S204, subjecting the bundled electrodes to vacuum self-smelting twice to form recycled TA8 titanium alloy ingots.

[0049] refer to Figure 3 The recycled TA8 titanium alloy ingot of this embodiment is sampled and tested at intervals along the radial direction. For example, the first sampling point D1 is on the central axis of the recycled TA8 titanium alloy ingot, the vertical distance between the second sampling point D2 and the central axis is half of the radius of the TA8 titanium alloy ingot, and the third sampling point D3 is on the side of the TA8 titanium alloy ingot. The oxygen chemical composition test results of the samples at points D1, D2, and D3 are 0.128%, 0.130%, and 0.126%, respectively.

[0050] Example 2

[0051] This embodiment proposes a method for preparing a Ti-Pd alloy with full return charge, the design goal of which is to prepare a 4t recycled TA8 titanium alloy ingot, comprising the following steps:

[0052] S1. Ti-Pd alloy residues are classified and recycled according to four types of titanium alloys: TA8, TA8-1, TA9, and TA9-1, and each type of Ti-Pd alloy residue is pretreated;

[0053] S2, using TA8 and TA8-1 waste as raw materials to prepare regenerated TA8, the specific steps are:

[0054] S201, weighing 1994 kg of pretreated TA8-1 residue and 2000 kg of pretreated TA8 residue respectively;

[0055] S202, weighing 6.0 kg TiO2 powder, the weighed TiO2 powder was evenly divided into 90 portions, each portion of TiO2 powder was sealed and wrapped with TiO2 special paper to make a preform, and then each preform was sealed and wrapped with a 0.3 mm thick titanium strip to make 90 titanium oxide bags;

[0056] S203, the weighed TA8-1 scraps and TA8 scraps are bundled into electrodes; in the process of bundling the electrodes, 90 titanium oxide bags are added to the inside of the electrodes at intervals, so that the titanium oxide bags are laid in three layers in the electrodes, and the three layers of titanium oxide bags are placed at 1 / 4, 1 / 2 and 3 / 4 of the height of the electrodes respectively, and each layer is evenly placed in 3 rows, and each row has 10 uniformly spaced bags along the length direction of the electrodes. The bundled electrodes are cylindrical, with a diameter of about 550 mm and a length of about 5600 mm. The material of the tie 1 used for bundling the electrodes is pure titanium;

[0057] S204, subjecting the bundled electrodes to vacuum self-smelting twice to form recycled TA8 titanium alloy ingots.

[0058] In this embodiment, the oxygen chemical composition detection results of the samples at points D1, D2, and D3 are 0.147%, 0.150%, and 0.149%, respectively.

[0059] Example 3

[0060] This embodiment proposes a method for preparing a Ti-Pd alloy with full return charge, the design goal of which is to prepare a 4t recycled TA9 titanium alloy ingot, comprising the following steps:

[0061] S1. Ti-Pd alloy residues are classified and recycled according to four types of titanium alloys: TA8, TA8-1, TA9, and TA9-1, and each type of Ti-Pd alloy residue is pretreated;

[0062] S2, using TA9-1 residue as raw material to prepare regenerated TA9, the specific steps are:

[0063] S201, weighing 3989 kg of pre-treated TA9-1 residue;

[0064] S202, weighing 11kg TiO2 powder, the weighed TiO2 powder was evenly divided into 30 portions, each portion of TiO2 powder was sealed and wrapped with TiO2 special paper to make a preform, and then each preform was sealed and wrapped with a 0.6mm thick titanium strip to make 30 titanium oxide bags;

[0065] S203, the weighed TA9-1 waste material is bundled into an electrode; in the process of bundling the electrode, 30 titanium oxide packages are added to the inside of the electrode at intervals, so that the titanium oxide packages are laid as a layer in the electrode and located at 1 / 2 of the height of the electrode, and the titanium oxide packages are evenly placed in 2 rows, with 15 titanium oxide packages evenly placed in each row along the length direction of the electrode. The bundled electrode is cylindrical, with a diameter of about 550 mm and a length of about 5600 mm. The material of the tie 1 used for bundling the electrode is pure titanium;

[0066] S204, subjecting the bundled electrodes to vacuum self-smelting twice; forming recycled TA9.

[0067] In this embodiment, the oxygen chemical composition detection results of the samples at points D1, D2, and D3 are 0.149%, 0.150%, and 0.151%, respectively.

[0068] Example 4

[0069] This embodiment proposes a method for preparing Ti-Pd alloy with full return charge, the design goal of which is to prepare 3.5t recycled TA9 titanium alloy ingot, comprising the following steps:

[0070] S1. Ti-Pd alloy residues are classified and recycled according to four types of titanium alloys: TA8, TA8-1, TA9, and TA9-1, and each type of Ti-Pd alloy residue is pretreated;

[0071] S2, using TA9 scrap and TA9-1 scrap as raw materials to prepare recycled TA9 titanium alloy, the specific steps are:

[0072] S201, weighing 997 kg of pretreated TA9-1 residue and 2500 kg of pretreated TA9 residue respectively;

[0073] S202, weighing 3.0 kg TiO2 powder, the weighed TiO2 powder was evenly divided into 60 portions, each portion of TiO2 powder was sealed and wrapped with TiO2 special paper to make a preform, and then each preform was sealed and wrapped with a 1 mm thick titanium strip to make 60 titanium oxide bags;

[0074] S203, the weighed TA9-1 scraps and TA9 scraps are bundled into electrodes; in the process of bundling the electrodes, 60 titanium oxide packages are added to the inside of the electrodes at intervals, so that the titanium oxide packages are laid in two layers in the electrodes, and the two layers of titanium oxide packages are placed at 1 / 4 and 3 / 4 of the height of the electrodes respectively, and each layer is evenly placed in 3 rows, and each row has 10 uniformly spaced packages along the length direction of the electrodes. The bundled electrodes are cylindrical, with a diameter of about 500 mm and a length of about 5600 mm. The material of the tie 1 used for bundling the electrodes is Ti-Pd alloy;

[0075] S204, subjecting the bundled electrodes to vacuum self-smelting twice to form recycled TA9 titanium alloy.

[0076] In this embodiment, the oxygen chemical composition detection results of the samples at points D1, D2, and D3 are 0.142%, 0.140%, and 0.139%, respectively.

[0077] In the above embodiment, the process of pre-treating each type of Ti-Pd alloy residue in S1 is:

[0078] Clean the oil and impurities on the surface of Ti-Pd alloy residues; store the risers, head and tail edge materials, and side strip materials of each type of Ti-Pd alloy residues separately; cut the risers, head and tail edge materials of the lath, and side strip materials;

[0079] The axis of the electrode is in the horizontal direction;

[0080] During the vacuum consumable melting process, the electrode needs to be turned around and melted in the second melting process;

[0081] TiO2 special paper is tracing paper;

[0082] The arrangement of the titanium oxide pack can be determined according to design requirements and is not limited to the arrangement methods listed in the above embodiments.

[0083] In order to demonstrate the beneficial effects of the present invention, the chemical composition of the outer circle of the midsole of the regenerated Ti-Pd alloy head prepared in Examples 1 to 4 was tested with reference to GB / T3620 "Titanium and Titanium Alloy Grades and Chemical Compositions". The results are shown in Table 1:

[0084] Table 1 Chemical composition test results

[0085]

[0086] Referring to GB / T3621 "Titanium and Titanium Alloy Plates", the recycled Ti-Pd alloys prepared in Examples 1 to 4 were prepared into plates, and the mechanical properties were tested. The results are shown in Table 2:

[0087] Table 2 Mechanical properties test results

[0088]

[0089] It can be seen from Table 1 and Table 2 that the recycled Ti-Pd alloy prepared by the present invention has uniform composition and complies with GB / T3620 "Titanium and Titanium Alloy Grades and Chemical Compositions". The plate performance produced by the present invention complies with GB / T3621 "Titanium and Titanium Alloy Plates" and has good plasticity and toughness, which can meet the practical application of large-scale engineering.

[0090] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A method for preparing Ti-Pd alloy by fully returning the charge, characterized in that: The following steps are involved: S1. Classify and recycle Ti-Pd alloy residues, wherein the Ti-Pd alloy residues include two types of titanium alloys, Ti-0.05Pd and Ti-0.2Pd. According to the different oxygen contents, the Ti-0.05Pd titanium alloy residues are classified into two types of titanium alloys, TA8 and TA8-1. The Ti-0.2Pd titanium alloy residues are classified into two types of titanium alloys, TA9 and TA9-1. Finally, the TA8, TA8-1, TA9 and TA9-1 titanium alloy residues are pretreated respectively. S2. According to the type of the regenerated Ti-Pd alloy to be prepared, select the corresponding type of pretreated Ti-Pd alloy residue, and prepare the regenerated Ti-Pd alloy through the selected Ti-Pd alloy residue.

2. The method for preparing Ti-Pd alloy by full return charge according to claim 1, characterized in that: In S2, when the type of the regenerated Ti-Pd alloy is TA8 titanium alloy, the pretreated TA8-1 scrap is selected as the raw material for the regenerated Ti-Pd alloy, or the pretreated TA8 scrap and TA8-1 scrap are selected as the raw materials for the regenerated Ti-Pd alloy; When the type of the regenerated Ti-Pd alloy is TA9 titanium alloy, the pretreated TA9-1 scrap is selected as the raw material for the regenerated Ti-Pd alloy, or the pretreated TA9 scrap and TA9-1 scrap are selected as the raw materials for the regenerated Ti-Pd alloy.

3. The method for preparing Ti-Pd alloy by full return charge according to claim 2, characterized in that: The steps of preparing the regenerated Ti-Pd alloy in S2 include: S201, weighing the selected pretreated Ti-Pd alloy residue according to the amount; S202, weighing TiO2 powder according to amount, and preparing the TiO2 powder into a plurality of titanium oxide bags; S203, bundling the weighed Ti-Pd alloy scraps into electrodes; in the process of bundling the electrodes, adding a plurality of prepared titanium oxide packages at even intervals, so that the plurality of prepared titanium oxide packages are respectively located at different positions in the electrode, and spot welding the prepared titanium oxide packages to the adjacent scraps to fix them together to prevent the titanium oxide packages from moving, scattering and accumulating. S204, performing vacuum self-smelting twice on the bundled electrodes to form a recycled Ti-Pd alloy.

4. The method for preparing Ti-Pd alloy by full return charge according to claim 3, characterized in that: In S202, the preparation method of the titanium oxide bag is: the weighed TiO2 powder is divided into multiple portions, each portion of the TiO2 powder is first sealed and wrapped with special TiO2 paper to make a preform, and then each preform is sealed and wrapped with titanium tape.

5. The method for preparing Ti-Pd alloy by full return charge according to claim 3, characterized in that: In S203, during the electrode bundling process, the titanium oxide package is laid in three layers in the electrode. The three layers of titanium oxide package are respectively placed at 1 / 4 depth, 1 / 2 depth and 3 / 4 depth of the electrode. Each layer is evenly placed in 2 to 4 rows, and each row has 8 to 12 evenly spaced packages along the length direction of the electrode.

6. The method for preparing Ti-Pd alloy by full return charge according to claim 1, characterized in that: The process of pre-treating each type of Ti-Pd alloy residue in S1 is as follows: Clean the oil and impurities on the surface of Ti-Pd alloy residue; Separately store the risers, plate head and tail edges, and edge strips in each type of Ti-Pd alloy residue; Cut the risers, head and tail edge materials, and edge strip materials.

7. The method for preparing Ti-Pd alloy by full return charge according to claim 4, characterized in that: The titanium strip used is made of one of TA1 and TA2, the thickness of the titanium strip is 0.1 to 1 mm, and the TiO2 special paper is tracing paper.

8. The method for preparing Ti-Pd alloy by full return charge according to claim 3, characterized in that: The electrode is cylindrical, has a diameter of 500-550 mm, a length of 3000-5600 mm, and a mass of 2-4 t.

9. The method for preparing Ti-Pd alloy by full return charge according to claim 3, characterized in that: The material of the cable tie used for bundling the electrodes is Ti-Pd alloy or pure titanium.

10. The method for preparing Ti-Pd alloy by full return charge according to claim 3, characterized in that: During the vacuum consumable melting process, during the second melting, the electrode is turned around and the melting is reversed.

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