CN110625127A - Preparation method of cobalt-chromium-nickel-tungsten alloy brazing filler metal powder - Google Patents
Preparation method of cobalt-chromium-nickel-tungsten alloy brazing filler metal powder Download PDFInfo
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- CN110625127A CN110625127A CN201911068880.5A CN201911068880A CN110625127A CN 110625127 A CN110625127 A CN 110625127A CN 201911068880 A CN201911068880 A CN 201911068880A CN 110625127 A CN110625127 A CN 110625127A
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- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
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- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
- B22F2009/0824—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid with a specific atomising fluid
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
- B22F2009/0844—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid in controlled atmosphere
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- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
- B22F2009/0848—Melting process before atomisation
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Abstract
The invention discloses a preparation method of cobalt-chromium-nickel-tungsten alloy brazing filler metal powder, which comprises the following steps: firstly, filling joints of a magnesium oxide crucible and heating for dehumidifying; secondly, uniformly mixing the raw materials, adding the mixture into a heated and dehumidified magnesium oxide crucible, and then putting the crucible into a smelting furnace of a vacuum induction smelting gas atomization powder making device for heating and smelting to obtain alloy liquid; and thirdly, flowing the alloy liquid out of a tundish of the vacuum induction melting gas atomization powder making device to an atomization chamber for atomization and dispersion, and cooling to obtain cobalt-chromium-nickel-tungsten alloy brazing filler metal powder. According to the invention, by virtue of crucible tamping process, raw material limitation and gas atomization process control, the cobalt-chromium-nickel-tungsten alloy brazing filler metal powder which is uniform and stable in chemical composition, low in impurity content, excellent in process performance, high in yield and suitable for batch production is obtained, and the requirements of various application fields on high-quality cobalt-chromium-nickel-tungsten alloy brazing filler metal powder are met.
Description
Technical Field
The invention belongs to the technical field of brazing material preparation, and particularly relates to a preparation method of cobalt-chromium-nickel-tungsten alloy brazing filler metal powder.
Background
The cobalt-based high-temperature alloy has good high-temperature mechanical property and oxidation resistance, and is an important raw material for manufacturing engine parts. In the manufacturing process of various parts, welding technology is required. The cobalt-chromium-nickel-tungsten alloy solder contains more than seven elements, has large difference of properties of the elements, particularly has high content of silicon and boron, has high content of formed intermediate brittle phase, and has high brittleness and no plasticity required by calendaring processing. When the alloy is used in the field of brazing filler metal, the alloy cannot be prepared into welding wires and welding strips for use, so that the preparation of brazing filler metal powder for use is an important way for the high-temperature alloy welding.
Generally, alloy brazing filler metal powder is often prepared by a centrifugal atomization powder preparation method or a special gas atomization powder preparation method. For example, the powder raw material used by the cobalt-based high-temperature alloy powder metallurgy material produced by Russia is prepared by adopting a centrifugal atomization method, but the centrifugal atomization method has high requirements on equipment precision, long process flow and the like, and no processing equipment of the type is available at home at present. Special gas atomization methods (e.g., crucible-free induction heating gas atomization) require that a round rod of a certain diameter and a suitable length is prepared, then induction heating is performed to obtain molten metal, and then the molten metal continuously flows into a nozzle without any contact, and inert gas is atomized to obtain powder. However, the method is complex in process, and the preparation of alloy bars with high brittleness is difficult, so that the method is not suitable for industrial large-scale production.
The vacuum induction melting gas atomization powder preparation has the characteristics of short process flow, wide adaptability, easy batch production and the like, and is the most commonly used method for preparing alloy powder. However, due to the differences of the properties of the alloys, the differences of the component requirements, the requirements of oxygen content control, impurity component control and particle size and yield, the key process technology and method are greatly different, no specific rule can be followed, and the preparation of the cobalt-chromium-nickel-tungsten alloy solder cannot be met.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a preparation method of cobalt-chromium-nickel-tungsten alloy solder powder aiming at the defects of the prior art. The method reduces the oxygen content and impurity content in the cobalt-chromium-nickel-tungsten alloy brazing filler metal powder by limiting the crucible tamping process and raw materials, improves the uniformity and stability of each component, improves the yield of the cobalt-chromium-nickel-tungsten alloy brazing filler metal powder by controlling the vacuum induction melting gas atomization process, obtains the cobalt-chromium-nickel-tungsten alloy brazing filler metal powder which has uniform and stable chemical components, low impurity content, excellent process performance, high yield and is suitable for batch production, and meets the requirements of various application fields on high-quality cobalt-chromium-nickel-tungsten alloy brazing filler metal powder.
In order to solve the technical problems, the invention adopts the technical scheme that: a preparation method of cobalt-chromium-nickel-tungsten alloy brazing filler metal powder is characterized by comprising the following steps:
step one, placing a magnesium oxide crucible in an induction melting coil, filling joints of the magnesium oxide crucible by adopting magnesia sand and water glass, and then heating the filled magnesium oxide crucible to remove moisture;
step two, uniformly mixing raw materials of an electrodeposited cobalt plate, an electrolytic nickel plate, electrolytic chromium, a sintered tungsten bar, high-purity silicon particles, a nickel-boron intermediate alloy and high-purity carbon, adding the mixture into the magnesium oxide crucible heated and dehumidified in the step one, then putting the mixture into a smelting furnace of vacuum induction smelting gas atomization powder making equipment, closing a furnace door, vacuumizing the smelting furnace until the vacuum degree is 1-10 Pa, and then heating and smelting to completely melt the raw materials into an alloy liquid; the specific process of heating and smelting is as follows: heating to raise the temperature until the raw materials begin to melt, filling argon to the vacuum degree of-0.04 MPa to-0.02 MPa, then heating to raise the temperature until the raw materials are completely melted, raising the temperature to 1600-1700 ℃ and preserving the heat for 10-15 min;
and step three, pouring the alloy liquid obtained in the step two into a tundish of a vacuum induction melting gas atomization powder making device, enabling the alloy liquid to flow out to an atomization chamber along a guide pipe at the bottom of the tundish, introducing high-pressure argon gas into the atomization chamber, atomizing the alloy liquid flowing out of the guide pipe in the atomization chamber under the action of high-pressure argon gas flow to disperse into tiny liquid drops, then enabling the tiny liquid drops to fall down and be cooled to form alloy powder, and carrying out grading screening on the alloy powder to obtain the cobalt-chromium-nickel-tungsten alloy brazing filler metal powder.
The invention adopts a vacuum induction melting gas atomization method to prepare cobalt-chromium-nickel-tungsten alloy solder powder, firstly reduces the oxygen content and the impurity content in the cobalt-chromium-nickel-tungsten alloy solder powder by the crucible tamping process and the raw material limitation, improves the uniformity and the stability of each component, then ensures that the raw material is not splashed in the melting and smelting process by controlling the raw material melting process and the atomization process of the vacuum induction melting gas atomization method, realizes the stable control of each component in alloy liquid, avoids the oxidation and burning loss of the raw material, realizes the complete alloying of each raw material, further improves the uniformity and the stability of chemical components in the cobalt-chromium-nickel-tungsten alloy solder powder, simultaneously improves the yield of the cobalt-chromium-nickel-tungsten alloy solder powder, and realizes the mass production.
The preparation method of the cobalt-chromium-nickel-tungsten alloy brazing filler metal powder is characterized in that the temperature for heating and dehumidifying in the step one is 900-1000 ℃, and the time is 8-10 hours. The preferred temperature and time facilitate sufficient removal of moisture and adsorbed oxygen from the surface of the magnesia crucible, ensuring low impurity levels and low oxygen content of the magnesia crucible.
The preparation method of the cobalt-chromium-nickel-tungsten alloy brazing filler metal powder is characterized in that in the second step, the mark of the electrodeposited cobalt plate is Co998, the mark of the electrolytic nickel plate is Ni9996, the mark of the electrolytic chromium is JCr99-A, the mark of the sintered tungsten bar is W-1, the mark of the high-purity silicon particles is Si-2, and the high-purity carbon is a carbon spectrum electrode. The preferred raw materials have high purity, and cobalt-chromium-nickel-tungsten alloy brazing filler metal powder with low impurity content is obtained.
The preparation method of the cobalt-chromium-nickel-tungsten alloy brazing filler metal powder is characterized in that in the third step, the tundish is preheated to 1000-1100 ℃ before the alloy liquid is poured into the tundish, and the diameter of the flow guide pipe is 4-6 mm. The preheating of the tundish ensures that the high-temperature alloy liquid is introduced into the tundish and cannot be cooled to cause poor fluidity so as to solidify and block a flow guide pipe, and the efficient atomization is favorably realized; the diameter of the guide pipe is favorable for the alloy liquid to flow out to the atomizing chamber for atomizing and dispersing.
The preparation method of the cobalt-chromium-nickel-tungsten alloy brazing filler metal powder is characterized in that the introducing pressure of the high-pressure argon in the step three is 2.5-3.5 MPa. The pressure is introduced to ensure that the alloy liquid flowing out of the flow guide pipe enters the atomizing chamber to be atomized efficiently under the carrying of high-pressure argon.
The preparation method of the cobalt-chromium-nickel-tungsten alloy brazing filler metal powder is characterized in that in the third step, the mass content of cobalt in the cobalt-chromium-nickel-tungsten alloy brazing filler metal powder is 47.0-54.5%, the mass content of chromium is 18.0-20.0%, the mass content of nickel is 16.0-18.0%, the mass content of tungsten is 3.5-4.5%, the mass content of silicon is 7.0-9.0%, the mass content of boron is 0.6-1.0%, the mass content of carbon is 0.1-0.4%, the mass content of oxygen is less than 0.05%, the mass content of sulfur is less than 0.02%, the mass content of phosphorus is less than 0.02%, the mass content of aluminum is less than 0.05%, the mass content of titanium is less than 0.05%, and the mass content of other impurities is less than 0.25%. The cobalt-chromium-nickel-tungsten alloy brazing filler metal powder with the composition content has low impurity content and excellent performance, and can meet the requirements of various application fields on high-quality cobalt-chromium-nickel-tungsten alloy brazing filler metal powder.
Compared with the prior art, the invention has the following advantages:
1. according to the invention, the cobalt-chromium-nickel-tungsten alloy brazing filler metal powder is prepared by adopting a vacuum induction melting gas atomization method, the oxygen content and the impurity content in the cobalt-chromium-nickel-tungsten alloy brazing filler metal powder are reduced by the crucible tamping process and raw materials and the control of the raw material melting process and atomization process of the vacuum induction melting gas atomization method, the uniformity and stability of each chemical component are improved, the yield of the cobalt-chromium-nickel-tungsten alloy brazing filler metal powder is improved, and the mass production is realized.
2. The invention adopts vacuum induction melting gas atomization powder preparation, has simple process and easy realization, and avoids the overhigh requirements of the traditional centrifugal atomization and crucible-free induction melting process on equipment, process and the like.
3. The cobalt-chromium-nickel-tungsten alloy brazing filler metal powder prepared by the invention has uniform and stable chemical components, the total impurity content is less than 0.44%, the oxygen content is less than 0.05%, the sulfur and phosphorus impurity contents are less than 0.02%, the aluminum and titanium impurity contents are less than 0.05%, the yield of powder with 100 meshes is more than 85%, the technological properties, particularly the brazing spreadability and the joint filling property, of the cobalt-chromium-nickel-tungsten alloy brazing filler metal powder are excellent, the cobalt-chromium-nickel-tungsten alloy brazing filler metal powder is suitable for batch production, and the requirements of various application fields on high-quality cobalt-chromium-nickel-tungsten alloy brazing filler metal powder are completely met.
The technical solution of the present invention is further described in detail by the accompanying drawings and examples.
Drawings
Fig. 1 is an SEM image of a brazing filler metal powder of chromium nickel tungsten alloy prepared in example 1 of the present invention.
Detailed Description
Example 1
The embodiment comprises the following steps:
step one, placing a magnesium oxide crucible in an induction melting coil, filling joints of the magnesium oxide crucible by adopting magnesia sand and water glass, and then heating the filled magnesium oxide crucible to remove moisture; the temperature of the heating dehumidification is 900 ℃, and the time is 8 hours;
step two, uniformly mixing 52.9kg of Co998 electrodeposited cobalt plate, 10.2kg of Ni9996 electrolytic nickel plate, 18.5kg of JCr99-A electrolytic chromium, 3.8kg of W-1 sintered tungsten bar, 7.5kg of Si-2 silicon particles, 7kg of nickel-boron intermediate alloy and 0.1kg of carbon spectrum electrode, adding the mixture into the magnesium oxide crucible heated and dehumidified in the step one, then putting the magnesium oxide crucible into a smelting furnace of vacuum induction smelting gas atomization powder making equipment, closing a furnace door, vacuumizing the smelting furnace until the vacuum degree in the smelting furnace is 1 Pa-10 Pa, and heating and smelting the mixture to completely melt the raw materials into alloy liquid; the mass content of boron in the nickel-boron intermediate alloy is 10%; the specific process of heating and smelting is as follows: heating to raise the temperature until the raw materials begin to melt, filling argon to the vacuum degree of-0.04 MPa to-0.02 MPa, then heating to raise the temperature until the raw materials are completely melted, and raising the temperature to 1600 ℃ for heat preservation for 10 min;
pouring the alloy liquid obtained in the step two into a tundish of a vacuum induction melting gas atomization powder making device, which is preheated to 1000 ℃, and flowing out to an atomizing chamber along a guide pipe at the bottom of the tundish, then introducing high-pressure argon gas into the atomizing chamber, atomizing and dispersing the alloy liquid flowing out of the guide pipe into tiny droplets in the atomizing chamber under the action of high-pressure argon gas flow, then falling and cooling to form alloy powder, and carrying out grading screening on the alloy powder to obtain cobalt-chromium-nickel-tungsten alloy brazing filler metal powder with the chemical composition of Co-18.5Cr-16.5Ni-3.8W-7.5 Si-0.7B-0.1C; the diameter of the flow guide pipe is 4 mm; the introducing pressure of the argon is 2.5 MPa; the yield of the powder with the particle size of-100 meshes in the cobalt-chromium-nickel-tungsten alloy brazing filler metal powder is 87%.
Through detection, the mass content of oxygen, sulfur, phosphorus, aluminum, titanium and other impurities in the brazing filler metal powder prepared in the embodiment is 0.045%, 0.015%, 0.017%, 0.021%, 0.022% and 0.24%, which indicates that the brazing filler metal powder is uniform and consistent in quality, low in impurity total amount and oxygen content and excellent in technological performance, and completely meets the technical requirements of various application fields on high-quality cobalt-chromium-nickel-tungsten alloy brazing filler metal powder.
Fig. 1 is an SEM image of the brazing filler metal powder of cr-ni-w alloy prepared in this example, and it can be seen from fig. 1 that the brazing filler metal powder of cr-ni-w alloy prepared in this example is mostly spherical, uniform in particle size distribution, and low in satellite powder content.
Example 2
The embodiment comprises the following steps:
step one, placing a magnesium oxide crucible in an induction melting coil, filling joints of the magnesium oxide crucible by adopting magnesia sand and water glass, and then heating the filled magnesium oxide crucible to remove moisture; the temperature of the heating dehumidification is 950 ℃, and the time is 9 hours;
step two, uniformly mixing 51kg of Co998 electrodeposited cobalt plate, 12.1kg of Ni9996 electrolytic nickel plate, 19kg of JCr99-A electrolytic chromium, 4kg of W-1 sintered tungsten bar, 8kg of Si-2 silicon particles, 5.7kg of nickel-boron intermediate alloy and 0.2kg of carbon spectrum electrode, adding the mixture into the magnesium oxide crucible heated and dehumidified in the step one, then putting the magnesium oxide crucible into a smelting furnace of vacuum induction smelting gas atomization powder making equipment, closing a furnace door, vacuumizing the smelting furnace until the vacuum degree in the smelting furnace is 1 Pa-10 Pa, and heating and smelting to completely melt the raw materials into alloy liquid; the mass content of boron in the nickel-boron intermediate alloy is 14%; the specific process of heating and smelting is as follows: heating to raise the temperature until the raw materials begin to melt, introducing argon to the vacuum degree of-0.04 MPa to-0.02 MPa, then heating to raise the temperature until the raw materials are completely melted, and raising the temperature to 1650 ℃ and preserving the heat for 15 min;
pouring the alloy liquid obtained in the step two into a tundish of a vacuum induction melting gas atomization powder making device, which is preheated to 1050 ℃, and flowing out to an atomization chamber along a guide pipe at the bottom of the tundish, then introducing high-pressure argon gas into the atomization chamber, atomizing and dispersing the alloy liquid flowing out of the guide pipe into tiny droplets in the atomization chamber under the action of high-pressure argon gas flow, then falling and cooling to form alloy powder, and carrying out grading screening on the alloy powder to obtain cobalt-chromium-nickel-tungsten alloy brazing filler metal powder with the chemical composition of Co-19Cr-17Ni-4W-8 Si-0.8B-0.2C; the diameter of the flow guide pipe is 5 mm; the introducing pressure of the argon is 3 MPa; the yield of the powder with the particle size of-100 meshes in the cobalt-chromium-nickel-tungsten alloy brazing filler metal powder is 89%.
Through detection, the mass content of oxygen, sulfur, phosphorus, aluminum, titanium and other impurities in the brazing filler metal powder prepared in the embodiment is 0.04%, 0.012%, 0.013%, 0.02% and 0.20%, which indicates that the brazing filler metal powder is uniform and consistent in quality, low in total impurity amount and oxygen content and excellent in technological performance, and completely meets the technical requirements of various application fields on high-quality cobalt-chromium-nickel-tungsten alloy brazing filler metal powder.
Example 3
The embodiment comprises the following steps:
step one, placing a magnesium oxide crucible in an induction melting coil, filling joints of the magnesium oxide crucible by adopting magnesia sand and water glass, and then heating the filled magnesium oxide crucible to remove moisture; the temperature of the heating dehumidification is 1000 ℃, and the time is 10 hours;
step two, mixing 47.1kg of Co998 electrodeposited cobalt plate, 13.1kg of Ni9996 electrolytic nickel plate, 20kg of JCr99-A electrolytic chromium, 4.5kg of W-1 sintered tungsten bars, 9kg of Si-2 silicon particles, 5.9kg of nickel-boron intermediate alloy and 0.4kg of carbon spectrum electrode uniformly, adding the mixture into the magnesium oxide crucible heated and dehumidified in the step one, then putting the magnesium oxide crucible into a smelting furnace of vacuum induction smelting gas atomization powder making equipment, closing a furnace door, vacuumizing the smelting furnace until the vacuum degree in the smelting furnace is 1-10 Pa, and heating and smelting the magnesium oxide crucible to completely melt the raw materials into alloy liquid; the mass content of boron in the nickel-boron intermediate alloy is 17%; the specific process of heating and smelting is as follows: heating to raise the temperature until the raw materials begin to melt, filling argon to the vacuum degree of-0.04 MPa to-0.02 MPa, then heating to raise the temperature until the raw materials are completely melted, raising the temperature to 1700 ℃ and preserving the heat for 12 min;
pouring the alloy liquid obtained in the step two into a tundish of a vacuum induction melting gas atomization powder making device, which is preheated to 1100 ℃, and flowing out to an atomization chamber along a guide pipe at the bottom of the tundish, then introducing high-pressure and high-speed argon into the atomization chamber, atomizing and dispersing the alloy liquid flowing out of the guide pipe into tiny droplets in the atomization chamber under the action of high-pressure argon gas flow, then falling and cooling to form alloy powder, and carrying out grading screening on the alloy powder to obtain cobalt-chromium-nickel-tungsten alloy brazing filler metal powder with a chemical component of Co-20Cr-18Ni-4.5W-9 Si-1.0B-0.4C; the diameter of the flow guide pipe is 6 mm; the introducing pressure of the argon is 3.5 MPa; the yield of 100-mesh powder in the cobalt-chromium-nickel-tungsten alloy solder powder is 90%.
Through detection, the mass content of oxygen, sulfur, phosphorus, aluminum, titanium and other impurities in the brazing filler metal powder prepared in the embodiment is 0.038%, 0.011%, 0.012%, 0.021% and 0.21%, which indicates that the brazing filler metal powder is uniform and consistent in quality, low in impurity total amount and oxygen content and excellent in process performance, and completely meets the technical requirements of various application fields on high-quality cobalt-chromium-nickel-tungsten alloy brazing filler metal powder.
Example 4
The present embodiment is different from embodiment 3 in that: the chemical composition of the cobalt-chromium-nickel-tungsten alloy solder powder of the embodiment is Co-18Cr-16Ni-3.5W-7 Si-0.6B-0.4C.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Any simple modification, change and equivalent changes of the above embodiments according to the technical essence of the invention are still within the protection scope of the technical solution of the invention.
Claims (6)
1. A preparation method of cobalt-chromium-nickel-tungsten alloy brazing filler metal powder is characterized by comprising the following steps:
step one, placing a magnesium oxide crucible in an induction melting coil, filling joints of the magnesium oxide crucible by adopting magnesia sand and water glass, and then heating the filled magnesium oxide crucible to remove moisture;
step two, uniformly mixing raw materials of an electrodeposited cobalt plate, an electrolytic nickel plate, electrolytic chromium, a sintered tungsten bar, high-purity silicon particles, a nickel-boron intermediate alloy and high-purity carbon, adding the mixture into the magnesium oxide crucible heated and dehumidified in the step one, then putting the mixture into a smelting furnace of vacuum induction smelting gas atomization powder making equipment, closing a furnace door, vacuumizing the smelting furnace until the vacuum degree is 1-10 Pa, and then heating and smelting to completely melt the raw materials into an alloy liquid; the specific process of heating and smelting is as follows: heating to raise the temperature until the raw materials begin to melt, filling argon to the vacuum degree of-0.04 MPa to-0.02 MPa, then heating to raise the temperature until the raw materials are completely melted, raising the temperature to 1600-1700 ℃ and preserving the heat for 10-15 min;
and step three, pouring the alloy liquid obtained in the step two into a tundish of a vacuum induction melting gas atomization powder making device, enabling the alloy liquid to flow out to an atomization chamber along a guide pipe at the bottom of the tundish, introducing high-pressure argon gas into the atomization chamber, atomizing the alloy liquid flowing out of the guide pipe in the atomization chamber under the action of high-pressure argon gas flow to disperse into tiny liquid drops, then enabling the tiny liquid drops to fall down and be cooled to form alloy powder, and carrying out grading screening on the alloy powder to obtain the cobalt-chromium-nickel-tungsten alloy brazing filler metal powder.
2. The method for preparing the cobalt-chromium-nickel-tungsten alloy solder powder as claimed in claim 1, wherein the temperature for heating and dehumidifying in the step one is 900-1000 ℃ and the time is 8-10 h.
3. The method for preparing the cobalt-chromium-nickel-tungsten alloy brazing filler metal powder as claimed in claim 1, wherein in the second step, the mark of the electrodeposited cobalt plate is Co998, the mark of the electrolytic nickel plate is Ni9996, the mark of the electrolytic chromium plate is JCr99-A, the mark of the sintered tungsten bar is W-1, the mark of the high-purity silicon particles is Si-2, and the high-purity carbon is a carbon spectrum electrode.
4. The method for preparing the cobalt-chromium-nickel-tungsten alloy brazing filler metal powder according to claim 1, wherein the tundish in the third step is preheated to 1000-1100 ℃ before the alloy liquid is poured into the tundish, and the diameter of the flow guide pipe is 4-6 mm.
5. The method for preparing the cobalt-chromium-nickel-tungsten alloy brazing filler metal powder according to claim 1, wherein the introducing pressure of the high-pressure argon in the step three is 2.5MPa to 3.5 MPa.
6. The method for preparing the cobalt-chromium-nickel-tungsten alloy solder powder according to claim 1, wherein the mass content of cobalt in the cobalt-chromium-nickel-tungsten alloy solder powder in the step three is 47.0-54.5%, the mass content of chromium is 18.0-20.0%, the mass content of nickel is 16.0-18.0%, the mass content of tungsten is 3.5-4.5%, the mass content of silicon is 7.0-9.0%, the mass content of boron is 0.6-1.0%, the mass content of carbon is 0.1-0.4%, the mass content of oxygen is less than 0.05%, the mass content of sulfur is less than 0.02%, the mass content of phosphorus is less than 0.02%, the mass content of aluminum is less than 0.05%, the mass content of titanium is less than 0.05%, and the mass content of other impurities is less than 0.25%.
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Application publication date: 20191231 |