Toughening-type high-temperature iridium rhodium thermocouple

A thermocouple and toughening technology, which is applied to thermometers, thermometers, and heat measurement of directly heat-sensitive electric/magnetic elements, can solve problems such as catalytic effect and high brittleness of iridium-rhodium thermocouples, etc., to achieve The effect of solving the catalytic effect, avoiding the fracture phenomenon and eliminating the error

Active Publication Date: 2014-07-16
BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA
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  • Abstract
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Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of high brittleness and catalytic effect of traditional iridium-rhodium series thermocouples, and the invention discloses a toughened high-temperature iridium-rhodium thermocouple

Method used

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  • Toughening-type high-temperature iridium rhodium thermocouple

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Embodiment 1

[0019] A kind of toughened high temperature iridium-rhodium thermocouple of the present invention comprises thermocouple wire, insulating porcelain tube, protective shell, such as figure 1 As shown; the connection relationship is: the thermocouple wire is placed inside the insulating porcelain tube; the insulating porcelain tube is covered with a protective shell; between the thermocouple wire and the insulating porcelain tube, and between the insulating porcelain tube and the protective shell are filled with high-temperature bonding Agent for fixing and sealing.

[0020] The positive and negative poles of the thermocouple all adopt IrRh alloy (iridium-rhodium alloy), and the weight percentage of Ir (iridium) in the positive pole is respectively 50%, and the weight percentage of Rh (rhodium) is respectively 50%; ) are 90% by weight, and Rh (rhodium) is 10% by weight respectively.

[0021] The insulating porcelain tube is high-purity double-hole magnesium oxide.

[0022] The ...

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Abstract

The invention relates to a thermocouple for high-temperature measurement, in particular to a toughened high-temperature iridium-rhodium thermocouple suitable for temperature measurement below 2400K, and belongs to the field of temperature measurement. Including thermocouple wire, insulating porcelain tube, and protective shell; thermocouple wire is placed inside the insulating porcelain tube; the outside of the insulating porcelain tube is covered with a protective shell; between the thermocouple wire and the insulating porcelain tube, and between the insulating porcelain tube and the protective shell The space is filled with high-temperature adhesive for fixing and sealing; it is characterized in that: the positive electrode of the thermocouple is made of IrRh alloy, and the weight percentages of Ir and Rh are respectively 40% to 60% and 60% to 40%; the negative electrode is made of IrRh The weight percentages of alloy, Ir and Rh are 80%-90% and 20%-10% respectively; the positive electrode and the negative electrode are welded into hot junctions; after the hot junctions are welded and the thermocouples are assembled, X needs stress relief annealing. The problem of high brittleness and catalytic effect of traditional iridium-rhodium thermocouples is solved. The breakage of the negative electrode is avoided, and the accuracy of measurement is improved.

Description

technical field [0001] The invention relates to a thermocouple for high-temperature measurement, in particular to a toughened high-temperature iridium-rhodium thermocouple, which belongs to the field of temperature measurement. Background technique [0002] At present, in various industrial fields, the problem of high temperature (generally above 1300K) measurement is often encountered. The thermocouple used to measure high temperature generally adopts noble metal wire. The maximum temperature that can be measured by the B-type thermocouple with standard graduation is about 2000K, and the platinum rhodium 40-platinum rhodium 20 (PtRh40-PtRh20) thermocouple with non-standard graduation The upper limit of the measurement temperature is about 2100K, while the upper limit of the measurement temperature of iridium-rhodium-iridium (Ir40Rh-Ir) and iridium 60 rhodium-iridium (Ir60Rh-Ir) non-standard graduation thermocouples can reach 2400K. However, since the negative electrode mat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K7/02G01K7/06G01K7/10
Inventor 杨永军赵俭
Owner BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA
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