Device and method for preparing high-performance platinum and platinum-rhodium thermocouple wire

A technology for thermocouple wires and preparation devices, which is applied in the field of preparation devices for platinum and platinum-rhodium thermocouple wires and high-performance platinum and platinum-rhodium thermocouple wires. Problems such as high broken wire rate, achieve good room temperature plasticity, good high temperature plasticity, and simplify processing procedures

Pending Publication Date: 2022-03-15
英特派铂业股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At the same time of these changes, many new technical problems have also been brought: ① high rate of broken wires in drawing; ② poor mechanical properties in fully annealed state; ③ low detection rate of thermocouples
The high broken wire rate is related to the poor plasticity under extremely fine wire diameter, while the poor mechanical properties in the fully annealed state and the low thermocouple detection rate are all related to the low high temperature strength
[0004] In the prior art, the method of improving material strength often adopts dispersion strengthening or solid solution, interstitial strengthening, but these methods will reduce the plasticity of the material while increasing the strength, and will affect the purity of the material, thereby affecting the thermoelectric potential

Method used

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  • Device and method for preparing high-performance platinum and platinum-rhodium thermocouple wire
  • Device and method for preparing high-performance platinum and platinum-rhodium thermocouple wire
  • Device and method for preparing high-performance platinum and platinum-rhodium thermocouple wire

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preparation example Construction

[0045] A preparation method of high-performance platinum and platinum-rhodium thermocouple wire, comprising the steps of:

[0046] Step 1, plugging the bottom of the crucible 14 with a stopper rod 8, and then placing the platinum-rhodium alloy material in the crucible 14, the weight of the platinum-rhodium alloy is controlled at 1-4Kg;

[0047] Step 2, close the furnace cover of the reaction furnace 1, open the water cooler 10, increase the power of the induction coil 13 to melt the alloy material in the crucible 14, and simultaneously energize the heating wire 17 to heat the crystallizer 3 to the melting point of the alloy;

[0048] Step 3: Reduce the power of the induction coil 13 to keep the alloy melt in a heat preservation state to ensure uniform composition, and at the same time turn on the vacuum pump 11 to evacuate the inner cavity of the reaction furnace 1 to 1×10 -6 Pa, and then filled with protective gas (argon, helium or nitrogen) to make the internal pressure the ...

Embodiment

[0055] 1) Block the bottom of the zirconia crucible with a zirconia stopper, then place 3kg of prepared pure platinum in the zirconia crucible;

[0056] 2) Close the lid of the reaction furnace, turn on the water cooler, increase the power of the induction coil to 21KW to melt the pure platinum in the crucible, and at the same time energize the tungsten heating wire to raise the temperature of the crystallizer to 1769°C;

[0057] 3) Reduce the power of the induction coil to 16KW to keep the pure platinum melt in a state of heat preservation, and at the same time turn on the vacuum pump to evacuate the inner cavity of the reaction furnace to 1×10 -6 Pa, then filled with protective gas argon to 1.01×10 5 Pa;

[0058] 4) Insert the pure platinum dummy rod into the crystallizer, install the cooling device 20mm away from the lower outlet of the crystallizer, and turn on the cooling device to spray cooling water towards the pure platinum dummy rod, then pull up the pull rod to pull...

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Abstract

The invention relates to a device and a method for preparing high-performance platinum and platinum-rhodium thermocouple wires. A smelting device is used for smelting a platinum-rhodium alloy material; the crystallizer is used for controlling the solid-liquid interface position; the dummy bar is used for pulling the cast ingot and pulling the cast ingot out of the crystallizer at a preset speed through the drawing device; and the cooling device rapidly cools the cast ingot by spraying cooling water. One-dimensional gradient heat transfer is realized in a mode of combining crystallizer heating and cooling water chilling, a dummy bar and a drawing device are ingeniously combined, directional solidification of platinum-rhodium alloy is realized, and the prepared platinum and platinum-rhodium thermocouple wire has good room-temperature plasticity, good high-temperature plasticity and relatively high high-temperature strength at the same time, and has no influence on the purity of the thermocouple wire; the cast ingot manufactured through the device is in a round rod shape, the surface is smooth, machining such as forging and strip rolling is not needed, direct die passing and drawing can be achieved, the machining procedure is simplified, and machining loss is reduced.

Description

technical field [0001] The present invention relates to a preparation device and method of high-performance platinum and platinum-rhodium thermocouple wires, in particular to a preparation of platinum and platinum-rhodium thermocouple wires that improve the stability, plasticity and high-temperature strength of platinum-rhodium thermocouple wires The device and method belong to the technical field of metal smelting. Background technique [0002] Platinum rhodium thermocouple wire is widely used in aerospace, iron and steel metallurgy and other industries because of its excellent thermoelectric properties. Due to the soaring price of raw materials, in order to save costs, platinum-rhodium thermocouple wires are forced to become thinner and thinner, from 0.07mm to 0.08mm filaments before 2005 to 0.04mm to 0.06mm fine wires from 2006 to 2020, and then Up to 2021, the diameter of thermocouple wire has undergone earth-shaking changes for ultra-fine wires <0.04mm. [0003] At...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/14B22D11/18B22D11/08B22D11/124
CPCB22D11/14B22D11/18B22D11/124B22D11/081
Inventor 周佳磊金英杰耿怀亮冯永强李雪娇
Owner 英特派铂业股份有限公司
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