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: 2013-02-20
BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA
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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
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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 relates to a toughening-type high-temperature iridium rhodium thermocouple for temperature measurement below 2400K, and belongs to the field of temperature testing. The toughening-type high-temperature iridium rhodium thermocouple comprises a thermocouple wire, an insulation procelain tube and a protective outer shell; the thermocouple wire is arranged in the insulation procelain tube; the protective outer shell is wrapped on the outer part of the insulation procelain tube; and high-temperature binders are filled between the thermocouple and the insulation procelain tube and between the insulation procelain tube and the protective outer shell, and are used for fixing and sealing. The toughening-type high-temperature iridium rhodium thermocouple is characterized in that the positive electrode of the thermocouple is made of an IrRh alloy, and the weight percentages of Ir and Rh are respectively 40%-60% and 60%-40%; and the negative electrode of the thermocouple is made of an IrRh alloy, the weight percentages of Ir and Rh are respectively 80%-90% and 20%-10%; the positive electrode and the negative electrode are welded into thermal joint points, and stress relief annealing is required to be carried out after the welding of the thermal joint points and before the assembling of the thermocouple. The problems that traditional thermocouple is high in brittlenss and has a catalytic effect are solved; the negative electrode is prevented from cracking; and the measurement accuracy 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...
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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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