Thermocouple insulating material moisture-absorption-preventing high-temperature sealing material and preparation method thereof

A technology of insulating materials and sealing materials, which is used in thermometers, thermometers, and heat measurement of electrical/magnetic components that are directly sensitive to heat, which can solve problems such as large limitations, moisture absorption failure, and poor temperature resistance.

Pending Publication Date: 2021-11-26
常州精瓷仪器科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since epoxy resin is a high molecular polymer, its temperature resistance is poor, and its working temperature ranges from -40 to 245 °C, which leads to a narrow working temperature range of thermocouples and great limitations.
In addition, when epoxy resin is used to encapsulate the end of the thermocouple probe, air leakage is prone to occur, resulting in the failure of the filling material magnesium oxide to absorb moisture, resulting in product scrap or rework, and reducing product yield

Method used

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  • Thermocouple insulating material moisture-absorption-preventing high-temperature sealing material and preparation method thereof
  • Thermocouple insulating material moisture-absorption-preventing high-temperature sealing material and preparation method thereof
  • Thermocouple insulating material moisture-absorption-preventing high-temperature sealing material and preparation method thereof

Examples

Experimental program
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preparation example Construction

[0031] The preparation method of the high-temperature sealing material for preventing moisture absorption of the thermocouple insulating material comprises:

[0032] Step 1, mixing the glass micropowder and terpineol evenly according to a certain mass ratio;

[0033] Step 2, using an agate mortar to grind the mixed powder in step 1 finer;

[0034] Step 3: Weighing the medium-weight mixed powders of Step 2 and placing them in a tablet press for press molding respectively to prepare a sealing material block.

[0035] Step 4: Thread the thermocouple wire into the block sealing material obtained in Step 3, then thread the combination of the thermocouple wire and the block sealing material into the stainless steel casing, connect it to the compensation wire at the end of the probe, and then heat it at high temperature. After the high-temperature glass sealing work is completed, it can be moderately crystallized through the glass heat treatment process in the later stage to form a ...

Embodiment

[0038] figure 1 It is a structural schematic diagram of an armored thermocouple, which shows the shapes and relative positions of the glass sealing material, the metal couple wire and the ferritic stainless steel casing in the present invention. The armored thermocouple is a thermocouple metal couple wire, a ceramic filling material, a glass sealing material and an alloy sleeve, and the glass sealing material of the present invention is used for sealing between the magnesium oxide powder and the ferritic stainless steel sleeve, and then applied Appropriate heat treatment process is used to draw and produce armored thermocouples of different specifications. Using glass powder as the sealing material can ensure the reliable insulation of the magnesium oxide powder in the armored thermocouple.

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Abstract

The invention relates to the technical field of thermocouples, in particular to a thermocouple insulating material moisture-absorption-preventing high-temperature sealing material and a preparation method of the thermocouple insulating material moisture-absorption-preventing high-temperature sealing material. The thermocouple insulating material moisture-absorption-preventing high-temperature sealing material comprises glass micro-powder of a mixed bond system in which ionic bonds and covalent bonds coexist, and a binder material. The softening temperature and viscous flow temperature of the high-temperature glass sealing material are both higher than the reliable working temperature of the existing epoxy resin, so that the insulation resistance value reduction caused by moisture absorption of magnesium oxide in a high-temperature state can be effectively improved. The high-temperature glass sealing material works at the temperature of 600 DEG C or above, the crystal state is partially analyzed, so that a uniformly dispersed ceramic phase is formed in the high-temperature glass sealing material so as to provide supporting force for the sealing material, and the low-viscosity glass is arranged outside the high-temperature glass sealing material so that the high-temperature glass sealing material is tightly combined with other materials of the thermocouple, such as filling material magnesium oxide powder and a stainless steel sleeve; and the wettability and the sealing performance between the interface and the interface are improved. The high-temperature glass sealing material can be properly crystallized through a later heat treatment process to form a glass-ceramic composite material, so that the strength and reliability of the glass-ceramic sealing material are further improved.

Description

technical field [0001] The invention relates to a sealing material, in particular to a high-temperature sealing material capable of preventing moisture absorption of a thermocouple insulating material and a preparation method thereof. Background technique [0002] A thermocouple is a sensor device that directly converts heat energy into an electrical signal and outputs a DC voltage signal to quickly display, record and transmit temperature data. Its working principle is to calculate the electromotive force generated by the temperature difference between the thermocouple wire normal temperature environment (referred to as the cold end) and the temperature measurement port (referred to as the hot end) of the test object environment through the linear relationship of the thermoelectric effect, and then obtain the temperature value of the detected object . Due to the characteristics of simple assembly, convenient replacement, good shock resistance, high measurement accuracy, fa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C8/24C03C12/00G01K7/06
CPCC03C8/24C03C12/00G01K7/06
Inventor 王晓春蒲健冯江涛池波
Owner 常州精瓷仪器科技有限公司
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