CN113832364A - Smelting method of platinum-rhodium couple wire - Google Patents

Smelting method of platinum-rhodium couple wire Download PDF

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CN113832364A
CN113832364A CN202111027218.2A CN202111027218A CN113832364A CN 113832364 A CN113832364 A CN 113832364A CN 202111027218 A CN202111027218 A CN 202111027218A CN 113832364 A CN113832364 A CN 113832364A
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rhodium
platinum
sintering
temperature
alloy
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CN113832364B (en
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王志江
施卫锋
耿怀亮
周佳磊
李雪娇
冯永强
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Intel Platinum Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/02—Making non-ferrous alloys by melting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/04—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of bars or wire
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D7/00—Casting ingots, e.g. from ferrous metals
    • B22D7/005—Casting ingots, e.g. from ferrous metals from non-ferrous metals
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C5/00—Alloys based on noble metals
    • C22C5/04—Alloys based on a platinum group metal
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

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Abstract

The invention provides a smelting method of a platinum-rhodium thermocouple wire, which comprises the following steps: step 1, sintering: sintering rhodium, controlling the sintering temperature and time, and introducing oxygen in the sintering process; step 2, melting: stopping introducing oxygen, adding platinum, and raising the temperature to completely melt the materials; and step 3, exhausting: gradually reducing the temperature after the materials are completely melted to slowly cool and solidify the alloy solution, keeping the solidification state for 30-60 s, raising the temperature to re-melt, repeating the process for at least 3 times, and introducing oxygen and argon in the exhaust process; and 4, refining: stopping introducing oxygen and argon, and adding a refining agent for refining; step 5, casting: reducing the temperature of the alloy solution, and then casting the alloy solution into a water-cooled copper mold to prepare a platinum-rhodium alloy cast ingot; and step 6, processing the platinum-rhodium alloy ingot into a platinum-rhodium coupling wire, wherein the prepared platinum-rhodium ingot has smooth surface, shallow shrinkage cavity, no shrinkage porosity basically in the interior, uniform components, high finished product rate and accurate temperature measurement.

Description

Smelting method of platinum-rhodium couple wire
Technical Field
The invention belongs to the technical field of metal materials, and particularly relates to a smelting method of a platinum-rhodium coupling wire.
Background
Due to the excellent high-temperature performance and thermoelectric performance of the platinum-rhodium alloy, the platinum-rhodium alloy is used for manufacturing various temperature measuring elements, including thermocouple wires, thermal resistors and the like, and is widely applied to temperature measurement in the fields of steel, glass, special metal, aerospace and the like, wherein the thermocouple wires are the most common type.
As the price of noble metal is continuously increased, the wire diameter of the platinum-rhodium thermocouple wire is required to be thinner and thinner, so that the rhodium element in the platinum-rhodium alloy ingot is segregated and shrunk to have greater influence on the processing and thermoelectric performance of the thermocouple wire, the yield is reduced, and the temperature measurement is inaccurate.
Disclosure of Invention
The present invention has been made to solve the above problems, and an object of the present invention is to provide a method for melting a platinum-rhodium thermocouple wire. The platinum-rhodium cast ingot prepared by the method has smooth surface, shallow shrinkage cavity, basically no shrinkage porosity in the platinum-rhodium cast ingot, uniform components, high finished product rate of the prepared platinum-rhodium coupling wire and accurate temperature measurement.
The invention provides a smelting method of a platinum-rhodium couple wire, which is characterized by comprising the following steps of:
step 1, sintering: sintering rhodium with the purity of more than 99.95 percent at the sintering temperature of 1000-1300 ℃ for 20-60 min, and introducing oxygen in the sintering process;
step 2, melting: stopping introducing oxygen after sintering, adding platinum with the purity of more than 99.99%, raising the temperature to 1900-2300 ℃, and completely melting the materials into an alloy solution, wherein the mass percentages of the platinum and the rhodium in the materials are as follows: 0 to 30 percent of rhodium and 70 to 100 percent of platinum;
and step 3, exhausting: after the materials are completely melted, gradually reducing the temperature to 1300-1600 ℃, slowly cooling and solidifying the alloy solution, keeping the solidification state for 30-60 s, then increasing the temperature to 1900-2300 ℃ for remelting, repeating the process for at least 3 times, and introducing oxygen and argon in the exhaust process;
and 4, refining: after the exhaust is finished, stopping introducing oxygen and argon, adding a refining agent into the alloy solution, and refining for 1-2 min;
step 5, casting: after refining, reducing the temperature of the alloy solution to 1800-2100 ℃, and then casting the alloy solution into a water-cooled copper mold to prepare a platinum-rhodium alloy cast ingot at the casting speed of 150-170 g/s;
and 6, processing the platinum-rhodium alloy ingot into a platinum-rhodium coupling wire.
Further, in the method for smelting the platinum-rhodium couple wire provided by the invention, the method can also have the following characteristics: the rhodium is sponge rhodium, and the platinum is a platinum block.
Further, in the method for smelting the platinum-rhodium couple wire provided by the invention, the method can also have the following characteristics: in the step 1, rhodium is placed into a crucible of a high-frequency induction smelting furnace for sintering, and the flow of pure oxygen introduced in the sintering process is 2L/min-3L/min.
Further, in the method for smelting the platinum-rhodium couple wire provided by the invention, the method can also have the following characteristics: the crucible is an yttria-stabilized zirconia crucible or a calcia-stabilized zirconia crucible.
Further, in the method for smelting the platinum-rhodium couple wire provided by the invention, the method can also have the following characteristics: in the step 3, the flow rate of oxygen is 0.01L/min-0.1L/min, and the flow rate of argon is 4L/min-5L/min.
Further, in the method for smelting the platinum-rhodium couple wire provided by the invention, the method can also have the following characteristics: the refining agent is CaB6、CaC2And one or more of SiC.
Further, in the method for smelting the platinum-rhodium couple wire provided by the invention, the method can also have the following characteristics: the water-cooling copper mould includes: the base, install overcoat on the base, install copper mould and joint in the overcoat, the copper mould with be formed with the flowing water space between the overcoat, be provided with the water inlet on the base, the water inlet with the flowing water space intercommunication, the overcoat is hollow column, the hollow structure's of overcoat both ends respectively with the flowing water space with connect the intercommunication, the copper mould is provided with the recess that is used for forming the ingot casting, be provided with the screw thread on the lateral wall of copper mould, the crest of the screw thread of copper mould with the inside wall contact of overcoat for the cooling water is followed behind the water inlet entering the flowing water space follow the bottom of copper mould is to opening direction spiral flow.
Further, in the method for smelting the platinum-rhodium couple wire provided by the invention, the method can also have the following characteristics: the thread arranged on the outer side wall of the copper mold is a rectangular thread, and the width of the tooth bottom of the rectangular thread is 6-8 mm.
Further, in the method for smelting the platinum-rhodium couple wire provided by the invention, the method can also have the following characteristics: the water inlet pressure of the joint of the water-cooling copper die is 1.5kgf/mm2～3.5kgf/mm2. The invention has the following advantages:
the smelting method of the platinum-rhodium couple wire, which is related by the invention, obtains the platinum-rhodium alloy ingot casting with smooth surface, shallow shrinkage cavity and basically no shrinkage porosity inside through the control of the smelting process and the unique water-cooling copper mold design, and has the advantage of uniform components, namely no segregation of rhodium element.
Drawings
Fig. 1 is a CT detection view of an ingot in example 1 of the present invention.
Fig. 2 is a partial cross-sectional view of a water-cooled copper mold in an embodiment of the present invention.
In the figure, arrows indicate the flow direction of the cooling water.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the following embodiments are specifically described in the melting method of the platinum-rhodium couple wire of the invention with reference to the attached drawings.
< example 1>
The smelting method of the platinum-rhodium 6 thermocouple wire comprises the following steps:
step 1, sintering: putting 120g of sponge rhodium with the purity of more than 99.95 percent into a calcium oxide stabilized zirconia crucible of a high-frequency induction smelting furnace for sintering, wherein the sintering temperature is 1100 ℃, the sintering time is 20min, and oxygen is introduced at the flow rate of 2L/min in the sintering process.
Step 2, melting: after sintering, stopping oxygen introduction, adding 1880g of platinum blocks with purity of more than 99.99%, raising the temperature to 2000 ℃, and melting all the materials into an alloy solution.
And step 3, exhausting: gradually reducing the temperature to 1400 ℃ after the materials are completely melted, slowly cooling and solidifying the alloy solution, keeping the solidification state for 40s, then increasing the temperature to 2000 ℃ for remelting, repeating the process for 6 times, and introducing 0.01L/min pure oxygen and 4L/min argon in the whole exhaust process;
and 4, refining: after the exhaust is finished, stopping introducing oxygen and argon, and adding CaB into the alloy solution6Refining for 1 min.
Step 5, casting: after refining, the temperature of the alloy solution is reduced to 1950 ℃, then the alloy solution is poured into a water-cooled copper mold by tilting the crucible at the casting speed of 161g/s to prepare a platinum-rhodium alloy cast ingot, and the water inlet pressure of a joint of the water-cooled copper mold is 1.5kgf/mm2。
As shown in fig. 2, the water-cooled copper mold includes: base 10, overcoat 20, copper mould 30, joint 40. The outer case 20 is mounted on the base 10, and the copper mold 30 is mounted in the outer case 20. A flowing water space 50 is formed between the copper mold 30 and the outer sleeve 20, a water inlet 11 is arranged on the base 10, the water inlet 11 is communicated with the flowing water space 50, the outer sleeve 20 is in a hollow column shape, and two ends of the hollow structure of the outer sleeve 20 are respectively communicated with the flowing water space 50 and the joint 40. The copper mold 30 is provided with a groove 31 for forming an ingot, the outer side wall of the copper mold 30 is provided with a thread 32, and the crest of the thread 32 of the copper mold contacts with the inner side wall of the outer sleeve 20, so that cooling water enters the flowing water space 50 from the water inlet 11 and then flows spirally from the bottom of the copper mold 30 to the opening direction. Specifically, the thread 32 arranged on the outer side wall of the copper mold 30 is a rectangular thread, and the root width of the rectangular thread is 6mm to 8 mm. When the alloy mold is used, the alloy solution is poured into the groove 31 of the copper mold 30, cooling water enters from the water inlet 11, spirally flows from the bottom of the copper mold 30 to the opening direction, enters the hollow part of the outer sleeve 20 and then flows out from the joint 40.
And 6, processing the platinum-rhodium alloy ingot into a platinum-rhodium coupling wire.
And (3) detection: detecting the cast ingot by using industrial CT, and finding that the cast ingot has a smooth surface, is compact as a whole, has no shrinkage cavity or shrinkage porosity, and the CT detection image of the cast ingot is shown in figure 1; processing the cast ingot into a wire with phi of 0.5mm, and detecting that the inhomogeneous thermal electromotive force is less than or equal to 4 mu V according to GB/T18034-2000; and continuously processing the wire with the diameter of phi 0.5mm to the diameter of phi 0.030mm, counting that the yield is more than or equal to 80 percent, and proving that the inner part of the ingot casting does not have the defects of shrinkage porosity and the like.
< example 2>
The smelting method of the platinum rhodium 10 thermocouple wire comprises the following steps:
step 1, sintering: 200g of sponge rhodium with the purity of more than 99.95 percent is put into a calcium oxide stabilized zirconia crucible of a high-frequency induction smelting furnace for sintering, the sintering temperature is 1000 ℃, the sintering time is 30min, and oxygen is introduced at the flow rate of 2.5L/min in the sintering process.
Step 2, melting: and stopping introducing oxygen after sintering is finished, adding 1800g of platinum blocks with the purity of more than 99.99 percent, raising the temperature to 1900 ℃, and completely melting the materials into an alloy solution.
And step 3, exhausting: gradually reducing the temperature to 1300 ℃ after the materials are completely melted, slowly cooling and solidifying the alloy solution, keeping the solidification state for 40s, then increasing the temperature to 1900 ℃ for remelting, repeating the process for 5 times, and introducing 0.05L/min pure oxygen and 4L/min argon in the whole exhaust process;
and 4, refining: after the exhaust is finished, stopping introducing oxygen and argon, and adding CaC into the alloy solution2Refining for 1.5 min.
Step 5, casting: after refining, the temperature of the alloy solution is reduced to 1800 ℃, then the alloy solution is poured into a water-cooled copper mold by tilting the crucible at the casting speed of 150g/s to prepare a platinum-rhodium alloy cast ingot, and the water inlet pressure of a joint of the water-cooled copper mold is 2.1kgf/mm2。
As shown in fig. 2, the water-cooled copper mold includes: base 10, overcoat 20, copper mould 30, joint 40. The outer case 20 is mounted on the base 10, and the copper mold 30 is mounted in the outer case 20. A flowing water space 50 is formed between the copper mold 30 and the outer sleeve 20, a water inlet 11 is arranged on the base 10, the water inlet 11 is communicated with the flowing water space 50, the outer sleeve 20 is in a hollow column shape, and two ends of the hollow structure of the outer sleeve 20 are respectively communicated with the flowing water space 50 and the joint 40. The copper mold 30 is provided with a groove 31 for forming an ingot, the outer side wall of the copper mold 30 is provided with a thread 32, and the crest of the thread 32 of the copper mold contacts with the inner side wall of the outer sleeve 20, so that cooling water enters the flowing water space 50 from the water inlet 11 and then flows spirally from the bottom of the copper mold 30 to the opening direction. Specifically, the thread 32 arranged on the outer side wall of the copper mold 30 is a rectangular thread, and the root width of the rectangular thread is 6mm to 8 mm. When the alloy mold is used, the alloy solution is poured into the groove 31 of the copper mold 30, cooling water enters from the water inlet 11, spirally flows from the bottom of the copper mold 30 to the opening direction, enters the hollow part of the outer sleeve 20 and then flows out from the joint 40.
And 6, processing the platinum-rhodium alloy ingot into a platinum-rhodium coupling wire.
And (3) detection: detecting the cast ingot by using industrial CT, and finding that the cast ingot has a smooth surface, is compact as a whole, and has no shrinkage cavity or shrinkage porosity; processing the cast ingot into a wire with phi of 0.5mm, and detecting that the inhomogeneous thermal electromotive force is less than or equal to 4 mu V according to GB/T18034-2000; and continuously processing the wire with the diameter of phi 0.5mm to the diameter of phi 0.030mm, counting that the yield is more than or equal to 81 percent, and proving that the interior of the ingot does not have the defects of shrinkage porosity and the like.
< example 3>
Step 1, sintering: putting 260g of sponge rhodium with the purity of more than 99.95 percent into an yttria-stabilized zirconia crucible of a high-frequency induction smelting furnace for sintering, wherein the sintering temperature is 1300 ℃, the sintering time is 30min, and oxygen is introduced at the flow rate of 3L/min in the sintering process.
Step 2, melting: after sintering, stopping oxygen introduction, adding 1740g of platinum blocks with purity of more than 99.99%, raising the temperature to 2300 ℃, and completely melting the materials into an alloy solution.
And step 3, exhausting: gradually reducing the temperature to 1400 ℃ after the materials are completely melted, slowly cooling and solidifying the alloy solution, keeping the solidification state for 40s, then increasing the temperature to 2300 ℃ for remelting, repeating the process for 3 times, and introducing 0.1L/min pure oxygen and 4.5L/min argon in the whole exhaust process;
and 4, refining: and after the exhaust is finished, stopping introducing oxygen and argon, adding SiC into the alloy solution, and refining for 1 min.
Step 5, casting: after refining, the temperature of the alloy solution is reduced to 2100 ℃, then the alloy solution is poured into a water-cooled copper mold by tilting the crucible at the casting speed of 162g/s to prepare a platinum-rhodium alloy cast ingot, and the water inlet pressure of a joint of the water-cooled copper mold is 3.5kgf/mm2。
As shown in fig. 2, the water-cooled copper mold includes: base 10, overcoat 20, copper mould 30, joint 40. The outer case 20 is mounted on the base 10, and the copper mold 30 is mounted in the outer case 20. A flowing water space 50 is formed between the copper mold 30 and the outer sleeve 20, a water inlet 11 is arranged on the base 10, the water inlet 11 is communicated with the flowing water space 50, the outer sleeve 20 is in a hollow column shape, and two ends of the hollow structure of the outer sleeve 20 are respectively communicated with the flowing water space 50 and the joint 40. The copper mold 30 is provided with a groove 31 for forming an ingot, the outer side wall of the copper mold 30 is provided with a thread 32, and the crest of the thread 32 of the copper mold contacts with the inner side wall of the outer sleeve 20, so that cooling water enters the flowing water space 50 from the water inlet 11 and then flows spirally from the bottom of the copper mold 30 to the opening direction. Specifically, the thread 32 arranged on the outer side wall of the copper mold 30 is a rectangular thread, and the root width of the rectangular thread is 6mm to 8 mm. When the alloy mold is used, the alloy solution is poured into the groove 31 of the copper mold 30, cooling water enters from the water inlet 11, spirally flows from the bottom of the copper mold 30 to the opening direction, enters the hollow part of the outer sleeve 20 and then flows out from the joint 40.
And 6, processing the platinum-rhodium alloy ingot into a platinum-rhodium coupling wire.
And (3) detection: detecting the cast ingot by using industrial CT, and finding that the cast ingot has a smooth surface, is compact as a whole, and has no shrinkage cavity or shrinkage porosity; processing the cast ingot into a wire with phi of 0.5mm, and detecting that the inhomogeneous thermal electromotive force is less than or equal to 4 mu V according to GB/T18034-2000; and continuously processing the wire with the diameter of phi 0.5mm to the diameter of phi 0.030mm, counting that the yield is more than or equal to 81 percent, and proving that the interior of the ingot does not have the defects of shrinkage porosity and the like.
< example 4>
Step 1, sintering: 600g of sponge rhodium with the purity of more than 99.95 percent is put into an yttria-stabilized zirconia crucible of a high-frequency induction smelting furnace for sintering, the sintering temperature is 1200 ℃, the sintering time is 60min, and oxygen is introduced at the flow rate of 2L/min in the sintering process.
Step 2, melting: and stopping introducing oxygen after sintering is finished, adding 1400g of platinum blocks with the purity of more than 99.99%, raising the temperature to 2150 ℃, and melting all the materials into an alloy solution.
And step 3, exhausting: gradually reducing the temperature to 1600 ℃ after the materials are completely melted, slowly cooling and solidifying the alloy solution, keeping the solidification state for 60s, then increasing the temperature to 2150 ℃ for remelting, repeating the process for 6 times, and introducing 0.1L/min pure oxygen and 5L/min argon in the whole exhaust process;
and 4, refining: after the exhaust is finished, stopping introducing the argon and the oxygen, and adding CaB into the alloy solution6Refining for 2 min.
Step 5, casting: after refining, the temperature of the alloy solution is reduced to 1980 ℃, then the alloy solution is poured into a water-cooled copper mold by tilting a crucible at the casting speed of 170g/s to prepare a platinum-rhodium alloy cast ingot, and the water inlet pressure of a joint of the water-cooled copper mold is 3.0kgf/mm2。
And 6, processing the platinum-rhodium alloy ingot into a platinum-rhodium coupling wire.
As shown in fig. 2, the water-cooled copper mold includes: base 10, overcoat 20, copper mould 30, joint 40. The outer case 20 is mounted on the base 10, and the copper mold 30 is mounted in the outer case 20. A flowing water space 50 is formed between the copper mold 30 and the outer sleeve 20, a water inlet 11 is arranged on the base 10, the water inlet 11 is communicated with the flowing water space 50, the outer sleeve 20 is in a hollow column shape, and two ends of the hollow structure of the outer sleeve 20 are respectively communicated with the flowing water space 50 and the joint 40. The copper mold 30 is provided with a groove 31 for forming an ingot, the outer side wall of the copper mold 30 is provided with a thread 32, and the crest of the thread 32 of the copper mold contacts with the inner side wall of the outer sleeve 20, so that cooling water enters the flowing water space 50 from the water inlet 11 and then flows spirally from the bottom of the copper mold 30 to the opening direction. Specifically, the thread 32 arranged on the outer side wall of the copper mold 30 is a rectangular thread, and the root width of the rectangular thread is 6mm to 8 mm. When the alloy mold is used, the alloy solution is poured into the groove 31 of the copper mold 30, cooling water enters from the water inlet 11, spirally flows from the bottom of the copper mold 30 to the opening direction, enters the hollow part of the outer sleeve 20 and then flows out from the joint 40.
And (3) detection: detecting the cast ingot by using industrial CT, and finding that the cast ingot has a smooth surface, is compact as a whole, and has no shrinkage cavity or shrinkage porosity; processing the cast ingot into a wire with phi of 0.5mm, and detecting that the inhomogeneous thermal electromotive force is less than or equal to 4 mu V according to GB/T18034-2000; and continuously processing the wire with the diameter of phi 0.5mm to the diameter of phi 0.030mm, counting that the yield is more than or equal to 78 percent, and proving that the inner part of the ingot does not have the defects of shrinkage porosity and the like.
The above embodiments are preferred examples of the present invention, and are not intended to limit the scope of the present invention.

Claims (9)

1. A smelting method of a platinum-rhodium couple wire is characterized by comprising the following steps:
step 1, sintering: sintering rhodium with the purity of more than 99.95 percent at the sintering temperature of 1000-1300 ℃ for 20-60 min, and introducing oxygen in the sintering process;
step 2, melting: stopping introducing oxygen after sintering, adding platinum with the purity of more than 99.99%, raising the temperature to 1900-2300 ℃, and completely melting the materials into an alloy solution, wherein the mass percentages of the platinum and the rhodium in the materials are as follows: 0 to 30 percent of rhodium and 70 to 100 percent of platinum;
and step 3, exhausting: after the materials are completely melted, gradually reducing the temperature to 1300-1600 ℃, slowly cooling and solidifying the alloy solution, keeping the solidification state for 30-60 s, then increasing the temperature to 1900-2300 ℃ for remelting, repeating the process for at least 3 times, and introducing oxygen and argon in the exhaust process;
and 4, refining: after the exhaust is finished, stopping introducing oxygen and argon, adding a refining agent into the alloy solution, and refining for 1-2 min;
step 5, casting: after refining, reducing the temperature of the alloy solution to 1800-2100 ℃, and then casting the alloy solution into a water-cooled copper mold to prepare a platinum-rhodium alloy cast ingot at the casting speed of 150-170 g/s;
and 6, processing the platinum-rhodium alloy ingot into a platinum-rhodium coupling wire.
2. The smelting method of the platinum-rhodium couple wire according to claim 1, characterized in that:
the rhodium is sponge rhodium, and the platinum is a platinum block.
3. The smelting method of the platinum-rhodium couple wire according to claim 1, characterized in that:
in the step 1, rhodium is placed into a crucible of a high-frequency induction smelting furnace for sintering, and the flow of pure oxygen introduced in the sintering process is 2L/min-3L/min.
4. The method for smelting the platinum-rhodium thermocouple wire according to claim 3, which is characterized in that:
the crucible is an yttria-stabilized zirconia crucible or a calcia-stabilized zirconia crucible.
5. The smelting method of the platinum-rhodium couple wire according to claim 1, characterized in that:
in the step 3, the flow rate of oxygen is 0.01L/min-0.1L/min, and the flow rate of argon is 4L/min-5L/min.
6. The smelting method of the platinum-rhodium couple wire according to claim 1, characterized in that:
the refining agent is CaB6、CaC2And one or more of SiC.
7. The smelting method of the platinum-rhodium couple wire according to claim 1, characterized in that:
the water-cooling copper mould includes: the base, install overcoat on the base, install copper mould and joint in the overcoat, the copper mould with be formed with the flowing water space between the overcoat, be provided with the water inlet on the base, the water inlet with the flowing water space intercommunication, the overcoat is hollow column, the hollow structure's of overcoat both ends respectively with the flowing water space with connect the intercommunication, the copper mould is provided with the recess that is used for forming the ingot casting, be provided with the screw thread on the lateral wall of copper mould, the crest of the screw thread of copper mould with the inside wall contact of overcoat for the cooling water is followed behind the water inlet entering the flowing water space follow the bottom of copper mould is to opening direction spiral flow.
8. The method for smelting the platinum-rhodium thermocouple wire according to claim 7, which is characterized in that:
the thread arranged on the outer side wall of the copper mold is a rectangular thread, and the width of the tooth bottom of the rectangular thread is 6-8 mm.
9. The smelting method of the platinum-rhodium couple wire according to claim 1, characterized in that:
the water inlet pressure of the joint of the water-cooling copper die is 1.5kgf/mm2～3.5kgf/mm2。
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20120105964A (en) * 2011-03-17 2012-09-26 희성금속 주식회사 Method of manufacturing an oxide dispersion strengthened platinum-rhodium alloy
CN203235915U (en) * 2013-04-23 2013-10-16 重庆材料研究院有限公司 Smelting and pouring copper-formed mould device for precious metal and alloys thereof
CN109434040A (en) * 2018-12-28 2019-03-08 无锡英特派金属制品有限公司 TFT platinum channel high-compactness platinum-rhodium alloy ingot casting preparation method
CN211218588U (en) * 2019-09-24 2020-08-11 泸州长江机械有限公司 Vertical semi-continuous casting round ingot casting crystallizer

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20120105964A (en) * 2011-03-17 2012-09-26 희성금속 주식회사 Method of manufacturing an oxide dispersion strengthened platinum-rhodium alloy
CN203235915U (en) * 2013-04-23 2013-10-16 重庆材料研究院有限公司 Smelting and pouring copper-formed mould device for precious metal and alloys thereof
CN109434040A (en) * 2018-12-28 2019-03-08 无锡英特派金属制品有限公司 TFT platinum channel high-compactness platinum-rhodium alloy ingot casting preparation method
CN211218588U (en) * 2019-09-24 2020-08-11 泸州长江机械有限公司 Vertical semi-continuous casting round ingot casting crystallizer

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