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Electrochemical making process and apparatus of super-miniature thermocouple

An electrochemical and thermocouple technology, applied in the field of electrochemical preparation of ultra-miniature thermocouples, can solve the problems of high price, difficulty, loss, etc., and achieve the effects of simple manufacturing process, improved response speed, and convenient holding

Inactive Publication Date: 2004-06-23
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Finer filaments are not readily available and are expensive
Because the diameter of the pair wire is too small, it is difficult to observe directly with the naked eye. A little carelessness in operation can easily lead to the breakage of the fine pair wire, or even loss.
If it needs to be connected with extension wires, it will further increase the difficulty of operation

Method used

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  • Electrochemical making process and apparatus of super-miniature thermocouple
  • Electrochemical making process and apparatus of super-miniature thermocouple
  • Electrochemical making process and apparatus of super-miniature thermocouple

Examples

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Embodiment 1

[0044] see Figure 4a with Figure 4b , put thermocouple wire 7 as anode and cathode graphite 33 in parallel on a platform 10, one end of thermocouple wire 7 is connected to power supply 4 anode, one end of cathode graphite rod 33 is connected to power supply 4 cathode, from thermocouple wire 7 and cathode graphite 33 Electrolyte drop 9 is dripped on the top of the middle part, and the closed circuit is connected to the power supply 53 through the wire 54, and the opening and closing of the circuit is realized by a switch; the diameter of the thermocouple wire 7 is in the range of tens of microns, such as 80 microns, 100 microns or 200 microns etc. Figure 4b It is a schematic diagram of ultra-fine thermocouple wire 72 obtained by etching thermocouple wire 7 in the electrolyte in the present invention, thereby obtaining thermocouple wire 72 whose size is significantly reduced. The same method can be used to etch the constantan wire 82, Figure 4c It is a schematic diagram o...

Embodiment 2

[0053] Example 2 is quite successful in processing miniature thermocouples with a slightly larger size, such as from several microns to tens of microns, but when the size of the thermocouple wire obtained by corrosion is quite small, such as tens of nanometers or less, its welding is quite difficult. But at this time, the ultra-miniature thermocouples can also be made under the basic point of the present invention to find other new processing procedures. The embodiment described below is an effective simplified solution, which can make the manufacturing process easier. The basic steps of this scheme are to firstly fabricate the thermocouple junction 88 of common size, and then use electrochemical method to etch the junction until a very small ultra-micro thermocouple junction is obtained. In this case, the welding procedure is carried out at the initial stage, and the welding of large-size thermocouples is quite easy. Just use ordinary electric sparks to weld the joints, avoid...

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Abstract

During the electrochemical making process of super-miniature thermocouple, one pair of thermocouple wire in 1-100 mm length are taken as anode set in flowing electrolyte for electrochemical etching to the thermometric section diameter of 0.00001-0.05mm before or after the ends of the thermocouple wire pair are hot bonded to form thermometric junction. The making apparatus includes one glass seat with transverse flow channel for the electrolyte to flow and crossed vertical channel, cathode graphite rod connected to the cathode of the power supply and adhered to the inner wall of the transverse flow channel, with some interval being left between the cathode graphite rod and the upper surface of the transverse flow channel. The present invention can make super-miniature thermocouple with nano level to micron level diameter.

Description

technical field [0001] The invention belongs to the manufacturing method and device of thermocouples in the field of thermal testing, and particularly relates to a kind of electrolytic etching of ordinary thermocouple wires by electrochemical method to process a thermocouple whose diameter is in the range of tens of microns to several nanometers and can quickly respond to temperature changes in small areas. The electrochemical preparation method and preparation device of the micro / nano-scale ultra-miniature thermocouple. Background technique [0002] An important trend in the current development of natural science and engineering technology is to move towards miniaturization, in which the measurement of temperature in ultra-micro regions or ultra-fast processes is a large class of important problems, such as: extremely challenging in micro-scale heat transfer experiments One of the topics is to measure the temperature and related information of materials in nanometer space a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F1/00G01K7/02H10N10/01
Inventor 周一欣刘静
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI