RU2699037C1 - Method of increasing reliability of temperature sensor attachment to surface of ceramic materials - Google Patents

Method of increasing reliability of temperature sensor attachment to surface of ceramic materials Download PDF

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Publication number
RU2699037C1
RU2699037C1 RU2018145486A RU2018145486A RU2699037C1 RU 2699037 C1 RU2699037 C1 RU 2699037C1 RU 2018145486 A RU2018145486 A RU 2018145486A RU 2018145486 A RU2018145486 A RU 2018145486A RU 2699037 C1 RU2699037 C1 RU 2699037C1
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Russia
Prior art keywords
temperature sensor
ceramic material
thermoelectrodes
heat
resistant adhesive
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RU2018145486A
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Russian (ru)
Inventor
Михаил Юрьевич Русин
Павел Викторович Просунцов
Максим Олегович Забежайлов
Сергей Александрович Анучин
Мария Николаевна Кордо
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Акционерное общество "Обнинское научно-производственное предприятие "Технология" им. А.Г. Ромашина"
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K11/00—Resistance welding; Severing by resistance heating
    • B23K11/04—Flash butt welding
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
    • G01K1/14—Supports; Fastening devices; Arrangements for mounting thermometers in particular locations
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
    • G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Investigating Or Analyzing Materials Using Thermal Means (AREA)

Abstract

FIELD: test equipment.SUBSTANCE: invention relates to test equipment, mainly to technique of thermal testing of ceramic fairings of missiles during radiation heating. Disclosed is a method of improving the reliability of mounting a temperature sensor to the surface of a ceramic material, including mounting thermoelectrodes soldered without beads using a heat-resistant adhesive. Thermoelectrodes are placed in quartz tubes having thermal expansion coefficient close to that of ceramic material and glued to surface by heat-resistant adhesive. At that, quartz tubes are removed from work junction point at distance equal to 20 diameters of thermoelectrode.EFFECT: high reliability of attaching the temperature sensor to the surface of the ceramic material compared to the prototype by more than 5 times.1 cl, 1 dwg

Description

Изобретение относится к испытательной технике, преимущественно к технике проведения тепловых испытаний образцов и изделий из керамических материалов при радиационном нагреве.The invention relates to a testing technique, mainly to a technique for conducting thermal tests of samples and products of ceramic materials by radiation heating.

При наземной отработке конструкции теплонагруженных элементов летательных аппаратов проводят тепловые испытания материалов, которые воспроизводят эксплуатационный тепловой режим посредством радиационного нагрева. В процессе испытаний температура контролируется датчиками температуры (термопарами), закрепленными на поверхности образцов и изделий так, чтобы не нарушалась целостность конструкции и прочностные свойства изделия.During surface testing of the design of heat-loaded elements of aircraft, thermal tests of materials that reproduce the operational thermal regime by means of radiation heating are carried out. During testing, the temperature is controlled by temperature sensors (thermocouples), mounted on the surface of the samples and products so that the integrity of the structure and the strength properties of the product are not violated.

Известен способ крепления термопары на поверхности керамического материала термостойким клеем (Температурные измерения: Справочник / Отв. ред. Геращенко О.А. Киев: Наук. Думка, 1989. 704 с.), выбранный в качестве прототипа. При этом термопара приклеивается по всей длине термоэлектродов термостойким клеем. Недостатком этого способа является ненадежность крепления термопары при измерении температуры поверхности изделий из керамических материалов вследствие различия температурных коэффициентов расширения керамики и материала термоэлектродов. В зоне рабочего спая возникают температурные напряжения, приводящие к разрыву термопары при остывании. Таким образом повторный нагрев возможен только при демонтаже и повторной наклейке термопары.There is a method of mounting a thermocouple on the surface of a ceramic material with heat-resistant adhesive (Temperature measurements: Reference / Ed. Edited by Gerashchenko OA Kiev: Science. Dumka, 1989. 704 S.), selected as a prototype. In this case, the thermocouple is glued along the entire length of the thermoelectrodes with heat-resistant adhesive. The disadvantage of this method is the unreliability of mounting the thermocouple when measuring the surface temperature of products made of ceramic materials due to the difference in temperature expansion coefficients of the ceramic and the material of the thermoelectrodes. In the area of the working junction, thermal stresses occur, leading to the rupture of the thermocouple during cooling. Thus, reheating is only possible with the dismantling and re-labeling of the thermocouple.

Задачей данного изобретения является повышение надежности крепления термопары на поверхности керамического материала при интенсивном радиационном нагреве.The objective of the invention is to increase the reliability of mounting a thermocouple on the surface of a ceramic material with intense radiation heating.

Задача решается тем, что предложен способ повышения надежности крепления датчика температуры к поверхности керамического материала, включающий - крепление спаянных без королька термоэлектродов с помощью термостойкого клея, термоэлектроды помещают в кварцевые трубки, имеющие коэффициент температурного расширения, близкий по значению с керамическим материалом, и приклеивают к поверхности термостойким клеем, при этом кварцевые трубки удалены от места рабочего спая на расстоянии равном 20 диаметрам термоэлектрода.The problem is solved in that a method is proposed for improving the reliability of fixing the temperature sensor to the surface of a ceramic material, including: fixing thermoelectrodes welded without a king using heat-resistant glue, the thermoelectrodes are placed in quartz tubes having a coefficient of thermal expansion similar in value to the ceramic material and glued to surface with heat-resistant adhesive, while the quartz tubes are removed from the working junction at a distance equal to 20 diameters of the thermoelectrode.

Изобретение поясняется конкретным примером крепления датчика температуры предложенным способом.The invention is illustrated by a specific example of mounting the temperature sensor of the proposed method.

Термопара изготовлена из термоэлектродов диаметром 0,2 мм. На расстоянии 8 мм от спая термоэлектроды помещены в кварцевые трубки с наружным диаметром 1,4 мм. Проводился нагрев при плотности потока падающего излучения 35 Вт/см2 в течение 50 с. Температура поверхности керамического материала достигала 1100°С. На фиг. показана микрофотография термопары после 5 циклов нагрева - остывания. Повреждения термопары не обнаружены. Показания термопары воспроизводятся с погрешностью не более 5°С, что доказывает повышение надежности заявляемого способа по сравнению с прототипом более, чем в 5 раз.The thermocouple is made of thermoelectrodes with a diameter of 0.2 mm. Thermoelectrodes are placed in quartz tubes with an outer diameter of 1.4 mm at a distance of 8 mm from the junction. The heating was carried out at an incident radiation flux density of 35 W / cm 2 for 50 s. The surface temperature of the ceramic material reached 1100 ° C. In FIG. shows a micrograph of a thermocouple after 5 cycles of heating - cooling. Damage to the thermocouple is not detected. The thermocouple readings are reproduced with an error of not more than 5 ° C, which proves the increase in the reliability of the proposed method in comparison with the prototype by more than 5 times.

Claims (1)

Способ повышения надежности крепления датчика температуры к поверхности керамического материала, включающий изготовление датчика температуры посредством спая термоэлектродов из термоэлектродной проволоки, крепление его к керамической поверхности термостойким клеем, отличающийся тем, что термоэлектроды спаивают без образования королька и помещают в кварцевые трубки с коэффициентом температурного расширения, согласованнным с керамическим материалом, расположенные на расстоянии от спая не менее 20 диаметров термоэлектрода, и приклеивают термостойким клеем к поверхности.A method for improving the reliability of attaching a temperature sensor to the surface of a ceramic material, including manufacturing a temperature sensor by soldering thermoelectrodes from a thermoelectrode wire, attaching it to a ceramic surface with heat-resistant adhesive, characterized in that the thermoelectrodes are soldered without formation of a bead and placed in quartz tubes with a coefficient of thermal expansion that is agreed upon with ceramic material, located at a distance from the junction of at least 20 diameters of the thermoelectrode, and They are heat-resistant adhesive to the surface.
RU2018145486A 2018-12-21 2018-12-21 Method of increasing reliability of temperature sensor attachment to surface of ceramic materials RU2699037C1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU301567A1 (en) * ПАТЕНТН ЕХйН NAS LIBRARY. M. Evsyunin
SU1185117A1 (en) * 1984-06-08 1985-10-15 Предприятие П/Я А-3759 Method of producing the thermocouple hot junction
SU1278619A1 (en) * 1985-01-16 1986-12-23 Предприятие П/Я А-3759 Method for manufacturing hot joint of thermocouple
RU2114404C1 (en) * 1995-11-14 1998-06-27 Российский федеральный ядерный центр - Всероссийский научно-исследовательский институт технической физики Process of manufacture of thermocouples
CN106568520A (en) * 2016-11-07 2017-04-19 宁波精丰测控技术有限公司 High temperature sensitive ceramic armored high-temperature thermocouple and manufacture method thereof

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU301567A1 (en) * ПАТЕНТН ЕХйН NAS LIBRARY. M. Evsyunin
SU1185117A1 (en) * 1984-06-08 1985-10-15 Предприятие П/Я А-3759 Method of producing the thermocouple hot junction
SU1278619A1 (en) * 1985-01-16 1986-12-23 Предприятие П/Я А-3759 Method for manufacturing hot joint of thermocouple
RU2114404C1 (en) * 1995-11-14 1998-06-27 Российский федеральный ядерный центр - Всероссийский научно-исследовательский институт технической физики Process of manufacture of thermocouples
CN106568520A (en) * 2016-11-07 2017-04-19 宁波精丰测控技术有限公司 High temperature sensitive ceramic armored high-temperature thermocouple and manufacture method thereof

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Боровкова Т.В., Елисеев В.Н., Лопухов И.И. "Повышение точности измерения температуры при испытаниях на стенде радиационного нагрева элементов конструкций из низкотеплопроводных материалов", Вестник Московского государственного технического университета им. Н.Э. Баумана. Серия "Машиностроение", 2006, номер 3, С.51-52. *

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