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Smelting method of platinum-rhodium thermocouple wire

A technology of dual wire and platinum-rhodium, which is applied in the field of smelting platinum-rhodium dual wire, can solve problems such as inaccurate temperature measurement and decreased yield, and achieve the effects of high yield, uniform composition, and accurate temperature measurement

Active Publication Date: 2021-12-24
英特派铂业股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to the continuous rise of the precious metal market, the wire diameter of platinum-rhodium thermocouple wire is becoming thinner and thinner, which leads to the segregation and shrinkage of rhodium in the platinum-rhodium alloy ingot, which will have a greater impact on the processing and thermoelectric performance of the thermocouple wire. Influence, making yield drop and temperature measurement inaccurate

Method used

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  • Smelting method of platinum-rhodium thermocouple wire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The smelting method of platinum-rhodium 6 thermocouple wire comprises the following steps:

[0027] Step 1, sintering: put 120g of rhodium sponge with a purity greater than 99.95% into a calcia-stabilized zirconia crucible of a high-frequency induction melting furnace for sintering, the sintering temperature is 1100°C, the sintering time is 20min, and the sintering process is 2L / min flow into the oxygen.

[0028] Step 2, melting: after the sintering, stop the supply of oxygen, add 1880g of platinum block with a purity greater than 99.99%, raise the temperature to 2000°C, and melt all the materials into an alloy solution.

[0029] Step 3, Exhaust: After all the materials are melted, gradually lower the temperature to 1400°C, let the alloy solution slowly cool and solidify, keep the solidified state for 40s, then raise the temperature to 2000°C to re-melt, this process is repeated 6 times, during the exhaust process 0.01L / min of pure oxygen and 4L / min of argon are introd...

Embodiment 2

[0036] The smelting method of platinum-rhodium 10 thermocouple wire comprises the following steps:

[0037] Step 1, sintering: put 200g of rhodium sponge with a purity greater than 99.95% into a calcia-stabilized zirconia crucible of a high-frequency induction melting furnace for sintering, the sintering temperature is 1000°C, the sintering time is 30min, and 2.5L / Oxygen is introduced at a flow rate of min.

[0038] Step 2, melting: after the sintering, stop the supply of oxygen, add 1800g of platinum block with a purity greater than 99.99%, raise the temperature to 1900°C, and melt all the materials into an alloy solution.

[0039] Step 3, Exhaust: After all the materials are melted, gradually lower the temperature to 1300°C, let the alloy solution slowly cool and solidify, keep the solidified state for 40s, then raise the temperature to 1900°C to re-melt, this process is repeated 5 times, during the exhaust process 0.05L / min of pure oxygen and 4L / min of argon are introduce...

Embodiment 3

[0046] Step 1, sintering: Put 260g of rhodium sponge with a purity greater than 99.95% into a high-frequency induction melting furnace yttria-stabilized zirconia crucible for sintering, the sintering temperature is 1300°C, the sintering time is 30min, and the sintering process is 3L / min flow into the oxygen.

[0047] Step 2, melting: after the sintering, stop the supply of oxygen, add 1740g of platinum ingot with a purity greater than 99.99%, raise the temperature to 2300°C, and melt all the materials into an alloy solution.

[0048] Step 3, Exhaust: After all the materials are melted, gradually lower the temperature to 1400°C, let the alloy solution slowly cool and solidify, keep the solidified state for 40s, then raise the temperature to 2300°C to re-melt, repeat this process 3 times, during the exhaust process 0.1L / min of pure oxygen and 4.5L / min of argon are introduced throughout the process;

[0049] Step 4, refining: after exhausting, stop the supply of oxygen and argon...

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Abstract

The invention provides a smelting method of a platinum-rhodium thermocouple wire. The smelting method comprises the following steps: 1, sintering, wherein rhodium is sintered, the sintering temperature and time are controlled, and oxygen is introduced in the sintering process; 2, melting, wherein the oxygen stops being introduced, platinum is added, and the temperature is raised to completely melt materials; 3, exhausting, wherein after the materials are completely melted, the temperature is gradually reduced to slowly cool and solidify an alloy solution, the solidification state is kept for 30-60 s, then the temperature is raised for re-melting, the process is repeated at least three times, and oxygen and argon are introduced in the exhausting process; 4, refining, wherein the oxygen and the argon stop being introduced, and a refining agent is added for refining; 5, casting, wherein the temperature of the alloy solution is reduced, and then the alloy solution is cast into a water-cooling copper mold to prepare a platinum-rhodium alloy cast ingot; and 6, machining the platinum-rhodium alloy ingot into the platinum-rhodium thermocouple wire. The platinum-rhodium ingot prepared through the method is smooth in surface, shallower in shrinkage cavity, basically free of shrinkage porosity inside and uniform in component, and the prepared platinum-rhodium thermocouple wire is high in yield and accurate in temperature measurement.

Description

technical field [0001] The invention belongs to the technical field of metal materials, and in particular relates to a method for smelting platinum-rhodium even wires. Background technique [0002] Due to its excellent high-temperature performance and thermoelectric performance, platinum-rhodium alloy is used to make various temperature measuring elements, including thermocouple wire and thermal resistance, etc., and is widely used in temperature measurement in steel, glass, special metals, aerospace and other fields, among which Thermocouple wire is the most common type. [0003] Due to the continuous rise of the precious metal market, the wire diameter of platinum-rhodium thermocouple wire is becoming thinner and thinner, which leads to the segregation and shrinkage of rhodium in the platinum-rhodium alloy ingot, which will have a greater impact on the processing and thermoelectric performance of the thermocouple wire. The influence makes the yield decrease and the temper...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/02C22C1/06C22C5/04B22D7/00B21C37/04
CPCC22C1/02C22C1/06C22C5/04B22D7/005B21C37/04Y02P10/25
Inventor 王志江施卫锋耿怀亮周佳磊李雪娇冯永强
Owner 英特派铂业股份有限公司
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