Smelting method of titanium-silver alloy
By mixing sponge titanium and silver particles to prepare titanium-silver electrode blocks, and using a vacuum consumable melting method, the problem of silver volatilization during the melting of large-size titanium-silver alloy ingots was solved, achieving high silver content and high-efficiency production.
Patent Information
- Application Number
- CN202511132009.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-13
- Publication Date
- 2025-11-07
AI Technical Summary
In traditional methods, during the smelting of large-sized titanium-silver alloy ingots, the volatilization of silver causes abnormal gas pressure in the arc zone, resulting in arc climbing, which hinders smelting and reduces the silver content.
Titanium-silver electrode blocks are prepared by mixing sponge titanium and silver particles. The titanium-silver intermediate alloy ingot is formed by vacuum consumable melting. The ingot is then cut into chips, mixed with sponge titanium, and melted again. The silver exists in alloy form, which reduces volatilization.
Stable melting of large-size titanium-silver alloy ingots has been achieved, with high silver content, which reduces production costs and improves production efficiency, making it suitable for large-scale mass production.
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Figure CN120905550A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application belongs to the technical field of titanium-silver alloy smelting, and particularly relates to a smelting method of titanium-silver alloy. BACKGROUND
[0002] Titanium-silver alloy is a new type of material, which has good antibacterial function. Titanium has high specific strength and good biocompatibility, and silver has excellent antibacterial performance. After the combination of the two, effective sterilization and antibacterial function can be realized in the field of medical health. At the same time, titanium and silver both have good corrosion resistance, so the titanium-silver metal antibacterial protective material is not easily eroded by the external environment. In addition, the titanium-silver metal antibacterial protective material has good compatibility with human tissues and will not cause rejection reaction of the human body. The titanium-silver metal antibacterial protective material still has stability and antibacterial protection performance under high temperature conditions, and can effectively prevent and control the spread and infection of microorganisms. Moreover, the silver element is added in the form of alloying, compared with the antibacterial material prepared by using antibacterial coating, there is no problem of antibacterial coating falling off due to long-term use or physical factors, thereby losing the antibacterial effect. The titanium-silver alloy has stable and durable antibacterial effect. Based on the above excellent performance, the market demand for titanium-silver metal antibacterial protective material is increasing. In the future, the titanium-silver metal antibacterial protective material is expected to be more widely used in the fields of medical treatment, environmental protection, food safety and other fields, and play an active role in epidemic prevention and public health. At the same time, the research and development of titanium-silver metal antibacterial protective material will continue to advance, and gradually realize comprehensive application in multiple fields.
[0003] In order to meet the above market demand, it is the key to realize large-scale batch production of titanium-silver alloy, but the current preparation method of titanium-silver alloy faces the following problems: In the traditional method, when silver particles are directly pressed with titanium sponge to smelt large-size ingot electrodes, such as ingots with a diameter of more than 300 mm, due to the fact that the titanium-silver alloy contains silver element which is extremely volatile, the silver vapor pressure continuously rises with the temperature rising, and a large amount of silver vapor will cause the gas pressure in the arc area to be abnormal, resulting in arc climbing phenomenon, and the arc cannot be concentrated in the central area of the lower end of the consumable electrode, thereby blocking the smelting and unable to smelt normally. In addition, due to the volatilization of silver element, the content of silver element in the titanium-silver alloy is reduced. SUMMARY
[0004] In order to solve the above technical problems, the application provides a smelting method of titanium-silver alloy, which can realize the smelting of large ingot TiAg, and the content of Ag element in the ingot can reach a high level.
[0005] The application is implemented by the following technical solutions.
[0006] The application provides a smelting method of titanium-silver alloy, which comprises the following steps: Mixing the titanium sponge and silver particles to obtain titanium-silver particles, pressing the titanium-silver particles into multiple titanium-silver electrode blocks, welding the multiple titanium-silver electrode blocks in sequence to obtain a titanium-silver electrode strip, and vacuum consumable melting the titanium-silver electrode strip to obtain a titanium-silver intermediate alloy ingot.
[0007] Cutting the titanium-silver intermediate alloy ingot into shavings, mixing the shavings with titanium sponge, pressing into multiple electrode blocks, welding the multiple electrode blocks to prepare an electrode strip, and vacuum consumable melting the electrode strip to obtain a titanium-silver alloy finished ingot.
[0008] Preferably, the mass percentage of silver in the titanium-silver particles is 20% to 30%.
[0009] Preferably, when preparing the titanium-silver particles, the silver content is increased by 2wt% based on the theoretical content of silver.
[0010] Preferably, the diameter of the titanium-silver intermediate alloy ingot is not more than 200mm.
[0011] Preferably, after mixing the titanium sponge and silver particles, the materials are layered and then pressed into multiple titanium-silver electrode blocks; when layering, the materials are arranged from top to bottom as titanium sponge, titanium-silver particles, and titanium sponge.
[0012] Preferably, when pressing the titanium-silver electrode blocks, the electrode block pressure is 10MPa to 60MPa, and the pressure holding time is 10s to 30s.
[0013] Preferably, when mixing the shavings and titanium sponge to press the electrode blocks, the electrode block pressure is 10MPa to 60MPa, and the pressure holding time is 10s to 30s.
[0014] Preferably, when vacuum consumable melting the titanium-silver electrode strip, the melting current is 3.0KA to 20.0KA, and the arc voltage is 28V to 35V.
[0015] Preferably, when vacuum consumable melting the electrode strip to obtain a titanium-silver alloy finished ingot, the vacuum consumable melting parameters are: the melting current is 3.0KA to 20.0KA, and the arc voltage is 28V to 35V.
[0016] Preferably, when preparing the shavings, the titanium-silver intermediate alloy ingot is first peeled and sawed to obtain a titanium-silver intermediate alloy light ingot, and the titanium-silver intermediate alloy light ingot is cut into shavings; the diameter of the shavings is 6mm to 20mm.
[0017] Preferably, the titanium sponge is OA-grade high-quality titanium sponge, and the silver particles are high-purity silver with an Ag content of greater than 99.99%; the particle size of the silver particles is 6mm to 8mm.
[0018] Compared with the prior art, the present application has the following beneficial effects: The present application first prepares a titanium-silver electrode block by mixing sponge titanium and high-purity silver particles, then melts the titanium-silver electrode block in a vacuum self-consumption arc furnace to obtain a titanium-silver intermediate alloy ingot, and then cuts the titanium-silver intermediate alloy ingot into shavings to prepare an electrode with sponge titanium, and then melts the electrode. Since silver and part of titanium are first prepared into an alloy, when preparing a large-size ingot, the silver exists in the form of an alloy rather than in the form of elemental silver, thereby reducing the volatilization of silver. This method can realize the melting of a large ingot of TiAg, and the content of Ag element in the ingot can reach a high level. The present application aims at batch application and can meet the needs of melting titanium-silver ingots with a diameter of 300 mm or more, and has good popularization value. BRIEF DESCRIPTION OF DRAWINGS
[0019] Figure 1 A physical diagram of a titanium-silver alloy ingot prepared for Example 1.
[0020] Figure 2 A physical diagram of a titanium-silver alloy ingot prepared for Example 2.
[0021] Figure 3 A physical diagram of a titanium-silver alloy ingot prepared for Comparative Example 1. DETAILED DESCRIPTION
[0022] In order to enable those skilled in the art to better understand the technical solutions of the present application and to implement them, the present application will be further described below in conjunction with specific examples and drawings, but the examples are not limiting of the present application. In each of the following examples, the experimental methods and detection methods are conventional methods unless otherwise specified, and the reagents and materials can be purchased on the market unless otherwise specified.
[0023] The present application provides a melting method of titanium-silver alloy, comprising the following steps: Step 101: fully mixing sponge titanium and high-purity silver particles to obtain titanium-silver particle material.
[0024] It should be noted that the content of silver element in the above titanium-silver particle material is between 20% and 30% (all percentages are by mass), and since silver is high-temperature burned during the melting process of the titanium-silver electrode block, the content of silver element needs to be increased by 2% on the basis of the theoretical content to ensure the antibacterial effect of the titanium-silver alloy antibacterial material.
[0025] In the preferred embodiments of the present application, the sponge titanium is selected to be OA grade high-quality sponge titanium with a particle size of 3 mm to 12.7 mm, an oxygen content of ≤0.02%, and an iron content of ≤0.01%; the high-purity silver particles have a particle size of 6 mm to 8 mm and are uniform in size, and the purity is 99.99%.
[0026] Step 102: pressing the titanium-silver particle material prepared in step 101 into a titanium-silver electrode block.
[0027] It should be noted that in step 101, the sponge titanium batching weighing accuracy is 1g, and the high-purity silver particle weighing accuracy is 0.1g. The accurately weighed sponge titanium and high-purity silver particles are fully stirred and mixed in the mixing system to ensure that the silver element in the prepared titanium-silver intermediate alloy is uniformly distributed, and then the mixed titanium-silver particles are pressed into square titanium-silver alloy electrode blocks by using a 6000-ton press. In the preferred embodiment of the present application, the mixing number is ≥20 circles, the mixing time is ≥300s, the electrode block pressure is set to 10MPa~60MPa, and the pressure holding time is 10s~30s.
[0028] Step 103: sequentially welding the plurality of titanium-silver electrode blocks prepared in step 102 to obtain a titanium-silver electrode strip.
[0029] In the preferred embodiment of the present application, a vacuum plasma welding box is used for welding to ensure that the electrode is not oxidized before melting, and to avoid tungsten inclusions caused by argon arc welding.
[0030] Step 104: vacuum consumable melting of the titanium-silver electrode strip prepared in step 103 to obtain a titanium-silver intermediate alloy ingot.
[0031] In the preferred embodiment of the present application, the following steps are included: The titanium-silver electrode strip is placed in the vacuum consumable furnace, and the vacuum is extracted to below 1Pa, the air leakage rate of the vacuum consumable furnace is controlled to be within 0.6Pa / min, and the titanium-silver alloy electrode strip is once melted to obtain a titanium-silver intermediate alloy ingot, the melting current is between 3.0KA~20.0KA, and the arc voltage is between 28V~35V. The prepared titanium-silver intermediate alloy ingot should not be too large, and the diameter is generally not more than 200mm.
[0032] Step 105: peeling, sawing and removing the titanium-silver alloy ingot head and tail of the titanium-silver intermediate alloy ingot prepared in step 104, and removing the composition uneven part and skin impurities caused by rapid solidification.
[0033] Step 106: turning the titanium-silver intermediate alloy ingot peeled in step 105 into a diameter of 6mm~20mm, and then acid washing, cleaning and drying the turnings to obtain clean titanium-silver intermediate alloy turnings.
[0034] Step 107: according to the silver element content required by the finished titanium-silver alloy, calculating the addition amount of the titanium-silver intermediate alloy turnings prepared in step 106, and appropriately increasing the loss compensation. The calculated titanium-silver intermediate alloy turnings and the calculated sponge titanium are mixed and pressed into electrode blocks. Then the electrode blocks are welded according to step 103 to prepare electrode strips, and finally the electrode strips are vacuum consumable melted according to step 104 to obtain the final titanium-silver alloy finished ingot.
[0035] In summary, the titanium-silver alloy smelting method is as follows: a certain proportion of titanium sponge and high-purity silver particles are mixed thoroughly, and then pressed into titanium-silver electrode blocks; then a plurality of titanium-silver alloy electrode blocks are sequentially welded to obtain titanium-silver electrode strips; then the titanium-silver electrode strips are subjected to vacuum consumable smelting to obtain titanium-silver intermediate alloy ingots; then the titanium-silver intermediate alloy ingots are turned into 6mm-20mm turnings; then the turned titanium-silver intermediate alloy turnings are mixed with high-quality titanium sponge, and then pressed into blocks; finally, the electrode strips obtained by mixing and pressing the titanium sponge and the titanium-silver intermediate alloy turnings are loaded into a vacuum consumable furnace for smelting to obtain finished titanium-silver alloy ingots.
[0036] The titanium-silver alloy smelting method of the present application first smelts a certain amount of silver elements together with titanium sponge into titanium-silver intermediate alloy, and then turns the prepared titanium-silver intermediate alloy into turnings, and finally smelts the titanium-silver intermediate alloy turnings together with titanium sponge into titanium-silver alloy ingots with a certain silver content. Since silver is first prepared into an alloy with a part of titanium, when a large-size ingot is prepared, the silver exists in the form of alloying rather than in the form of silver element, thereby reducing the volatilization of silver elements. This smelting method can effectively solve the problem that, when a titanium-silver alloy is smelted into a large ingot, the added silver elements volatilize in large quantities into silver vapor at high temperature, greatly increasing the vapor pressure of silver, thereby blocking the electric arc and causing the smelting to fail to proceed.
[0037] Compared with general smelting of titanium-silver alloy, the smelting method can realize smelting of a larger ingot, improve production efficiency, and greatly reduce the formation of silver vapor during smelting and the volatilization of silver. Since silver is a noble metal, the cost can be greatly reduced.
[0038] The titanium-silver alloy smelting method of the present application is simple and efficient, has low production cost, and can obtain titanium-silver alloy with uniform distribution of silver elements, so that the titanium-silver alloy does not have the problem that silver elements are distributed only on the surface of the titanium-silver alloy due to volatilization of silver, and the titanium-silver alloy ingot exhibits good antibacterial properties after being made into a material.
[0039] The present application provides a titanium-silver alloy smelting method.
[0040] The present application will be further described in detail through specific examples and comparative examples.
[0041] Example 1 (1) Preparation of materials: 47.9kg of high-quality titanium sponge with OA grade and a Brinell hardness of ≤85(HBW10 / 1500 / 30) was selected for standby. The composition of the titanium sponge was as follows: O element w%<0.03, Fe element w%<0.02, C element w%<0.01, N element w%<0.003, and H element w%<0.001. 23.3kg of high-purity silver particles with a particle size of 6mm-8mm and a purity of 99.99% were selected for standby.
[0042] (2) Take 4.7 kg of titanium sponge and 2.3 kg of high-purity silver particles and mix them for 300 s to obtain titanium-silver particle material, and then layer the material, with 2 kg of titanium sponge at the bottom, the mixed titanium-silver particle material in the middle, and 2 kg of titanium sponge at the top, with silver in the middle to reduce volatilization.
[0043] (3) Use a 6000-ton press to press the layered titanium-silver particle material from step (2) at a pressure of 60 MPa for 20 s to obtain a φ100 mm x 350 mm titanium-silver electrode block.
[0044] (4) Weld multiple titanium-silver electrode blocks in a vacuum welding box to obtain a titanium-silver electrode strip, with a vacuum degree of 4 Pa and a leakage rate of 3 Pa / min before welding, and then dry the electrode at 120°C.
[0045] (5) Put the titanium-silver electrode strip into a vacuum consumable furnace for vacuum consumable smelting to obtain a titanium-silver intermediate alloy ingot. The auxiliary electrode is pure titanium TA1, the vacuum degree before melting is 0.9 Pa, the leakage rate is 0.5 Pa / min, the stable current is 3.0 kA, and the stable voltage is 31 V.
[0046] (6) Perform skinning treatment on the smelted titanium-silver intermediate alloy ingot with a size of φ200 mm x 398 mm, with a skinning depth of 0.8 mm, to obtain a titanium-silver intermediate alloy bright ingot with a size of φ199 mm x 398 mm.
[0047] (7) Turn the titanium-silver intermediate alloy bright ingot into a titanium-silver intermediate alloy scrap material with a diameter of 8 mm to 15 mm on a lathe.
[0048] (8) Mix 93.75 kg of titanium-silver intermediate alloy scrap material with 906.25 kg of high-quality titanium sponge, and then press it at a pressure of 60 MPa for 20 s to obtain a φ100 mm x 350 mm electrode block. Weld the electrode block into an electrode strip, with a vacuum degree of 4 Pa and a leakage rate of 3 Pa / min before welding, and then dry the electrode at 120°C.
[0049] (9) Put the new electrode strip into a vacuum consumable furnace for vacuum consumable smelting to obtain a titanium-silver alloy finished ingot. The auxiliary electrode is pure titanium TA1, the vacuum degree before melting is 0.9 Pa, the leakage rate is 0.5 Pa / min, the stable current is 3.0 kA, and the stable voltage is 31 V.
[0050] The titanium-silver alloy finished ingot prepared by the above steps has a size of φ447 mm x 1390 mm, as shown in the physical diagram. Figure 1 The content of silver element is 2.6%, the theoretical content is 3.0%, and the loss of silver element is small.
[0051] Example 2 (1) Preparation: select 50 kg of high-quality titanium sponge for standby, titanium sponge grade OA, Brinell hardness ≤85 (HBW10 / 1500 / 30). Composition: O element w% <0.03, Fe element w% <0.02, C element w% <0.01, N element w% <0.003, H element w% <0.001. Select 20 kg of high-purity silver particles with a particle size of 6 mm~8 mm and a purity of 99.99% for standby.
[0052] (2) Mix 5 kg of titanium sponge and 2 kg of high-purity silver particles for 300 s to obtain titanium-silver particle material, then adopt layered distribution, the bottom layer is 2 kg of titanium sponge, the middle layer is the obtained titanium-silver particle material, and the top layer is 2 kg of titanium sponge, with silver in the middle to reduce volatilization.
[0053] (3) Adopt a 6000 ton press to press the layered distributed titanium-silver particle material in step (2) into a φ100 mm×350 mm titanium-silver electrode block under a pressure of 60 MPa and a pressure holding time of 20 s.
[0054] (4) Weld multiple titanium-silver electrode blocks in a vacuum welding box to obtain a titanium-silver electrode strip, with a vacuum degree of 3 Pa and a leakage rate of 2 Pa / min before welding, and then dry the electrode at 120°C.
[0055] (5) Load the titanium-silver electrode strip into a vacuum consumable furnace for vacuum consumable smelting to obtain a titanium-silver intermediate alloy ingot. The auxiliary electrode is pure titanium TA1, with a vacuum degree of 0.7 Pa and a leakage rate of 0.5 Pa / min before melting, a stable current of 3.2 kA, and a stable voltage of 34 V.
[0056] (6) Perform skinning treatment on the smelted titanium-silver intermediate alloy ingot with a size of φ198 mm×400 mm, with a skinning depth of 0.8 mm, to obtain a titanium-silver intermediate alloy bloom with a size of φ197 mm×400 mm.
[0057] (7) Turn the titanium-silver intermediate alloy bloom into a titanium-silver intermediate alloy scrap with a diameter of 8 mm~15 mm on a lathe.
[0058] (8) Mix 95 kg of titanium-silver intermediate alloy scrap with 905 kg of high-quality titanium sponge, then press into a φ100 mm×350 mm electrode block under a pressure of 60 MPa and a pressure holding time of 20 s, weld the electrode block into an electrode strip, with a vacuum degree of 3 Pa and a leakage rate of 2 Pa / min before welding, and then dry the electrode strip at 120°C.
[0059] (9) Load the new electrode strip into a vacuum consumable furnace for vacuum consumable smelting to obtain a titanium-silver alloy finished ingot. The auxiliary electrode is pure titanium TA1, with a vacuum degree of 0.7 Pa and a leakage rate of 0.5 Pa / min before melting, a stable current of 3.2 kA, and a stable voltage of 34 V.
[0060] The titanium-silver alloy finished ingot prepared by the above steps has a size of φ452 mm x 1375 mm, and a physical diagram is shown in Figure 2 The content of silver element is 2.7%, the theoretical content is 3.0%, and the loss of silver element is small.
[0061] Example 3 (1) Preparation of raw materials: 46.7 kg of high-quality titanium sponge was selected for standby, the grade of the titanium sponge was OA grade, and the Brinell hardness was ≤85 (HBW10 / 1500 / 30). The composition was: O element w% <0.03, Fe element w% <0.02, C element w% <0.01, N element w% <0.003, and H element w% <0.001. 23.5 kg of high-purity silver particles with a particle size of 6 mm~8 mm and a purity of 99.99% were selected for standby.
[0062] (2) 4.8 kg of titanium sponge and 2.2 kg of high-purity silver particles were mixed for 300 s to obtain titanium-silver particle material, and then the material was layered and distributed, with 2 kg of titanium sponge at the bottom, the titanium-silver particle material obtained by mixing in the middle, and 2 kg of titanium sponge at the top. The silver was placed in the middle to reduce volatilization.
[0063] (3) The titanium-silver particle material layered and distributed in step (2) was pressed into a φ100 mm x 350 mm titanium-silver electrode block under a pressure of 60 MPa for 20 s using a 6000 ton press.
[0064] (4) A plurality of titanium-silver electrode blocks were sequentially welded in a vacuum welding box to obtain a titanium-silver electrode strip. The vacuum degree before welding was 4 Pa, the air leakage rate was 3 Pa / min, and then the electrode was dried at 120°C.
[0065] (5) The titanium-silver electrode strip was loaded into a vacuum consumable furnace for vacuum consumable smelting to obtain a titanium-silver intermediate alloy ingot. A pure titanium TA1 was used as an auxiliary electrode. The vacuum degree before melting was 0.9 Pa, the air leakage rate was 0.5 Pa / min, the stable current was 3.5 kA, and the stable voltage was 30 V.
[0066] (6) The smelted titanium-silver intermediate alloy ingot with a size of φ200 mm x 400 mm was subjected to skinning treatment with a skinning depth of 0.8 mm to obtain a titanium-silver intermediate alloy bright ingot with a size of φ199 mm x 400 mm.
[0067] (7) The titanium-silver intermediate alloy bright ingot was turned into a titanium-silver intermediate alloy scrap material with a diameter of 8 mm~15 mm on a lathe.
[0068] (8) Mix 94.15 kg of titanium-silver intermediate alloy scrap and 905.3 kg of high-quality sponge titanium, press into φ100 mm x 350 mm electrode blocks under 60 MPa pressure for 20 s, weld the electrode blocks into electrode strips, vacuum degree before welding is 4 Pa, air leakage rate is 3 Pa / min, then dry the electrode at 120°C.
[0069] (9) Put the new electrode strip into a vacuum consumable furnace for vacuum consumable smelting to obtain titanium-silver alloy finished ingot. The auxiliary electrode uses pure titanium TA1, the vacuum degree before smelting is 0.9 Pa, the air leakage rate is 0.5 Pa / min, the stable current is 3.5 kA, and the stable voltage is 30 V.
[0070] The loss of silver element in the titanium-silver alloy finished ingot prepared in the above steps is 1.2%.
[0071] Example 4 (1) Prepare materials: select 50 kg of high-quality sponge titanium for standby, the sponge titanium grade is OA grade, and the Brinell hardness is ≤85 (HBW10 / 1500 / 30). The composition is: O element w% <0.03, Fe element w% <0.02, C element w% <0.01, N element w% <0.003, and H element w% <0.001. Select 25 kg of high-purity silver particles with a particle size of 6 mm-8 mm and a purity of 99.99% for standby.
[0072] (2) Weigh 5.0 kg of sponge titanium and 2.5 kg of high-purity silver particles, mix for 300 s to obtain titanium-silver particle material, then adopt layered distribution, the bottom layer is 2 kg of sponge titanium, the middle layer is the obtained titanium-silver particle material, and the top layer is 2 kg of sponge titanium, with silver in the middle to reduce volatilization.
[0073] (3) Use a 6000-ton press to press the layered titanium-silver particle material in step (2) into φ100 mm x 350 mm titanium-silver electrode blocks under 60 MPa pressure for 20 s.
[0074] (4) Weld multiple titanium-silver electrode blocks in a vacuum welding box to obtain titanium-silver electrode strips, the vacuum degree before welding is 4 Pa, the air leakage rate is 3 Pa / min, and then dry the electrode at 120°C.
[0075] (5) Put the titanium-silver electrode strip into a vacuum consumable furnace for vacuum consumable smelting to obtain a titanium-silver intermediate alloy ingot. The auxiliary electrode uses pure titanium TA1, the vacuum degree before smelting is 0.9 Pa, the air leakage rate is 0.5 Pa / min, the stable current is 3.0 kA, and the stable voltage is 29 V.
[0076] (6) Perform skinning treatment on the smelted titanium-silver intermediate alloy ingot with a size of φ200 mm x 399 mm, the skinning depth is 0.8 mm, to obtain a titanium-silver intermediate alloy light ingot with a size of φ199 mm x 399 mm.
[0077] (7) The titanium-silver intermediate alloy ingot is turned into a titanium-silver intermediate alloy scrap with a diameter of 8 mm to 15 mm on a lathe.
[0078] (8) 93.5 kg of the titanium-silver intermediate alloy scrap and 907.3 kg of high-quality titanium sponge are mixed, and pressed into a φ100 mm*350 mm electrode block under a pressure of 60 MPa for 20 s, and the electrode block is welded into an electrode strip, and the vacuum degree before welding is 4 Pa, the air leakage rate is 3 Pa / min, and then the electrode is dried at 120°C.
[0079] (9) The new electrode strip is loaded into a vacuum consumable furnace for vacuum consumable smelting to obtain a titanium-silver alloy finished ingot. The auxiliary electrode is pure titanium TA1, the vacuum degree before melting is 0.9 Pa, the air leakage rate is 0.5 Pa / min, the stable current is 3.0 kA, and the stable voltage is 29 V.
[0080] The loss of silver element in the titanium-silver alloy finished ingot prepared by the above steps is 1.1%.
[0081] Comparative Example 1 The silver particles and the titanium sponge are directly pressed into an electrode for smelting and casting an ingot with a diameter of 300 mm or more by using a traditional preparation process, and the specific steps are as follows: (1) Material preparation: high-quality titanium sponge is selected for standby, and the titanium sponge is OA grade, and the Brinell hardness is ≤85 (HBW10 / 1500 / 30). The composition is: O element w% <0.03, Fe element w% <0.02, C element w% <0.01, N element w% <0.003, and H element w% <0.001. High-purity silver particles with a particle size of 6 mm to 8 mm and a purity of 99.99% are selected for standby.
[0082] (2) The silver particles and the titanium sponge are mixed according to a proportion of 3% of the mass fraction of silver element, and the titanium-silver particles are obtained by mixing the titanium sponge and the high-purity silver particles for 150 s.
[0083] (3) The titanium-silver particles are pressed into titanium-silver electrode blocks by using a press under a pressure of 60 MPa for 20 s.
[0084] (4) A plurality of titanium-silver electrode blocks are sequentially welded in a vacuum welding box to obtain a titanium-silver electrode strip, and the vacuum degree before welding is 4 Pa, the air leakage rate is 3 Pa / min, and then the electrode is dried at 120°C.
[0085] (5) The titanium-silver electrode strip is loaded into a vacuum consumable furnace for one-time vacuum consumable smelting, and the auxiliary electrode is pure titanium TA1, the vacuum degree before melting is 0.9 Pa, the air leakage rate is 0.5 Pa / min, the stable current is 3.5 kA, and the stable voltage is 28 V.
[0086] (6) The titanium-silver alloy ingot after the first melting is put into a vacuum consumable furnace for the second melting, and a pure titanium TA1 is used as the auxiliary electrode. The vacuum degree before melting is 0.9 Pa, the air leakage rate is 0.5 Pa / min, the stable current is 3.5 kA, and the stable voltage is 28 V, so as to obtain the titanium-silver alloy finished ingot.
[0087] The titanium-silver alloy finished ingot prepared by the above steps has a size of φ210x275, and a physical diagram is shown in Figure 3 The content of silver element is 0.93%, and the theoretical content is 3%, so the loss of silver element is serious.
[0088] By comparing the above examples and the comparative examples, it can be found that the present application first melts a certain amount of silver element with titanium sponge to form a titanium-silver intermediate alloy, then turns the prepared titanium-silver intermediate alloy into chips, and finally melts the titanium-silver intermediate alloy chips with titanium sponge to form a titanium-silver alloy ingot with a certain silver content. This method successfully melts and prepares a large-size titanium-silver alloy ingot, and the content of Ag element in the ingot can reach a high level. The preparation process of the present application is simple, the cost is low, and it is very suitable for large-scale batch production.
[0089] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application belong to the scope of the claims of the present application and their equivalent technologies, these modifications and variations are also intended to be included.
Claims
1. A method of smelting a titanium-silver alloy, characterized by, The method comprises the following steps: Titanium sponge and silver particles are mixed to obtain titanium-silver particles, the titanium-silver particles are pressed into multiple titanium-silver electrode blocks, the multiple titanium-silver electrode blocks are sequentially welded to obtain a titanium-silver electrode strip, and the titanium-silver electrode strip is subjected to vacuum consumable melting to obtain a titanium-silver intermediate alloy ingot; The titanium-silver intermediate alloy ingot is cut into shavings, the shavings are mixed with titanium sponge, pressed into multiple electrode blocks, and the multiple electrode blocks are welded into an electrode strip, and the electrode strip is subjected to vacuum consumable melting to obtain a titanium-silver alloy finished ingot.
2. The melting method of a titanium-silver alloy according to claim 1, characterized by, In the titanium-silver particles, the mass percentage of silver is 20% to 30%.
3. The method of melting a titanium-silver alloy according to claim 1, characterized in that, When the titanium-silver particles are prepared, the silver content is increased by 2wt% based on the theoretical content of silver.
4. The method of melting a titanium-silver alloy according to claim 1, characterized in that, After the titanium sponge and the silver particles are mixed, they are layered and then pressed into multiple titanium-silver electrode blocks; during the layering, the titanium sponge, the titanium-silver particles, and the titanium sponge are sequentially arranged from top to bottom.
5. The method of melting a titanium-silver alloy according to claim 1, characterized in that, The diameter of the titanium-silver intermediate alloy ingot is not more than 200 mm.
6. The method of melting a titanium-silver alloy according to claim 1, characterized in that, When the titanium-silver electrode blocks are pressed, the electrode block pressure is 10 MPa to 60 MPa, and the pressure holding time is 10 s to 30 s. When the shavings are mixed with the titanium sponge to press the electrode blocks, the electrode block pressure is 10 MPa to 60 MPa, and the pressure holding time is 10 s to 30 s.
7. The method of melting a titanium-silver alloy according to claim 1, characterized in that, When the titanium-silver electrode strip is subjected to vacuum consumable melting, the melting current is 3.0 KA to 20.0 KA, and the arc voltage is 28 V to 35 V. When the electrode strip is subjected to vacuum consumable melting to obtain a titanium-silver alloy finished ingot, the vacuum consumable melting parameters are as follows: the melting current is 3.0 KA to 20.0 KA, and the arc voltage is 28 V to 35 V.
8. The method of melting a titanium-silver alloy according to claim 1, characterized in that, The diameter of the shavings is 6 mm to 20 mm.
9. The method of melting a titanium-silver alloy according to claim 1, wherein The titanium sponge is OA-grade titanium sponge, the silver content in the silver particles is greater than 99.99%, and the particle size of the silver particles is 6 mm to 8 mm.