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A cobalt-based alloy used for sheathed thermocouple cables

An armored thermocouple, cobalt-based alloy technology, applied in the field of alloys, can solve the problems of inability to make armored thermocouple deep-processed products, reduce the strength and plasticity of alloys, and limit the scope of application, so as to solve technical defects and use restrictions, improve The effect of stability and improvement of anti-oxidation

Inactive Publication Date: 2015-07-08
绍兴市上虞神舟仪表有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing cobalt-based alloys cannot meet the requirements for the use of armored thermocouple cables at high temperatures above 950°C, because the existing cobalt-based alloys are prone to form CoO·CoCr2O4 fish scales in high temperature environments. The combination with the matrix is ​​poor, and it is easy to melt at high temperature; and the alloy is easy to form acicular and flaky TCP-σ and flaky (CrFe) 2N phases after long-term use above 950 ° C, which will seriously reduce the strength and plasticity of the alloy and cannot be fabricated Armored thermocouple deep processing products, which limits its scope of application

Method used

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  • A cobalt-based alloy used for sheathed thermocouple cables
  • A cobalt-based alloy used for sheathed thermocouple cables
  • A cobalt-based alloy used for sheathed thermocouple cables

Examples

Experimental program
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Effect test

Embodiment 1

[0015] Embodiment 1 In the present invention, the positive and negative thermocouple wires of the N-type armored thermocouple cable: the metal sleeve 4 prepared by nickel-chromium-silicon-nickel-silicon-magnesium and cobalt-based alloys are cleaned, and the positive poles of the thermocouple wires are cleaned. 1 and the negative electrode 2 are penetrated into the insulator material 3, and then penetrated into the cobalt-based alloy metal sleeve, and are prepared through drawing, diameter reduction, and heat treatment processes. The prepared armored thermocouple cable has an outer diameter of Φ12.7mm and a service temperature of 1100°C. After testing, the thermal stability of the armored thermocouple at this temperature is <1.0°C / 250h, and the working frequency withstand voltage is 500VAC / min without breakdown. .

Embodiment 2

[0016] Embodiment 2 In the present invention, the positive and negative thermocouple wires of the K-type armored thermocouple cable are cleaned from the metal sleeve 4 prepared by nickel-chromium-nickel-aluminum and cobalt-based alloys, and the positive electrodes 1 and 1 of the thermocouple wires are cleaned. The negative electrode 2 is penetrated into the insulator material 3, and then penetrated into the cobalt-based alloy metal sleeve, and is prepared through drawing, diameter reduction, and heat treatment processes. The outer diameter of the prepared armored thermocouple cable is Φ0.5mm, and the operating temperature is 1200°C. After testing, the thermal stability of the armored thermocouple at this temperature is <2.0°C / 250h, and the working frequency withstand voltage is 500VAC / min without breakdown. .

Embodiment 3

[0017] Embodiment 3 In the present invention, the positive and negative thermocouple wires of the K-type armored thermocouple cable are cleaned from the metal sleeve 4 prepared by nickel-chromium-nickel-silicon and cobalt-based alloys, and the positive electrodes 1 and 1 of the thermocouple wires are cleaned. The negative electrode 2 is penetrated into the insulator material 3, and then penetrated into the cobalt-based alloy metal sleeve, and is prepared through drawing, diameter reduction, and heat treatment processes. The outer diameter of the prepared armored thermocouple cable is Φ1.5mm, and the operating temperature is 1150°C. After testing, the thermal stability of the armored thermocouple at this temperature is <1.5°C / 250h, and the working frequency withstand voltage is 500VAC / min without breakdown. .

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Abstract

A cobalt-based alloy used for sheathed thermocouple cables is disclosed. The cobalt-based alloy comprises following components by mass: 0-0.0042% of C, 22-25% of Cr, 0.3-0.8% of Nb, 0.2-0.5% of Co, 0.1-0.3% of Mo, 0.2-0.8% of Fe, 0.01-0.02% of Mg, 1-1.5% of Si, 0-0.02% of P and 0-0.01% of S, with the balance being Ni. The cobalt-based alloy facilitates processing of sheathed thermocouple cables under a condition of ensuring plasticity, can be used for high-temperature environments, overcomes a plurality of technical defects and use restrictions in practical application, and prolongs the service lifetime of a sheathed thermocouple.

Description

technical field [0001] The invention belongs to the technical field of alloys, in particular to a cobalt-based alloy for armored thermocouple cables. Background technique [0002] One of the temperature sensors, armored thermocouple products, is drawn from armored thermocouple cables. Among them, the armored thermocouple cable is a flexible and solid combination made of insulators, thermocouple wires and outer protective sleeves (metal sleeves) repeatedly pressed. It has small size, high temperature sensitivity, and pressure resistance. , shock resistance, corrosion resistance, free bending and other characteristics, therefore, it can respond quickly to small temperature changes, especially the open end type, the fastest response speed can reach 0.01S, its flexibility is good, easy to install and use , It is irreplaceable for ordinary assembly thermocouples. Mainly used in high temperature, anti-oxidation, anti-corrosion occasions, widely used in metallurgy, petroleum, avi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/05G01K7/04H01B1/02
Inventor 蒋坚王魁汉王进峰
Owner 绍兴市上虞神舟仪表有限公司
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