Thermo-couple composite protective sleeve and making method thereof

A technology for protecting sleeves and thermocouples, used in thermometers that use electrical/magnetic components directly sensitive to heat, measuring heat, and using electrical devices, etc., can solve the problem of corrosion resistance, thermal shock resistance and mechanical properties. Strength problems, affecting the stable control of the production process, unable to meet the actual needs and other problems, to achieve the effect of excellent high temperature oxidation resistance and liquid metal corrosion resistance, anti-stripping performance, and good Zn-Al corrosion resistance

Inactive Publication Date: 2007-03-07
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The thermocouple is immersed in the high-temperature zinc-aluminum liquid for a long time. Due to the strong corrosion effect of the zinc-aluminum liquid, the iron-based material will react with the plating solution in the zinc pot and mainly generate Fe 2 Al 5 The service life of thermocouples is usually 3 to 5 days, and the shortest time is only 12 hours. Not only the consumption of thermocouples is large, but also the process of thermocouple damage is easy to cause large fluctuations in temperature and affect to stable control of the production process
The commonly used non-metallic thermocouple protection sleeves such as Al 2 o 3 Although its corrosion resistance is good, its thermal shock resistance is poor and it is prone to rupture and damage. Due to its low mechanical strength, graphite material casings are prone to collision damage during the manual extraction of zinc slag.
Chinese patent CN 1062972 also applies pyrolytic boron nitride coating or directly makes pyrolytic boron nitride casing on C / C composite material or high-strength graphite substrate under high temperature conditions, which also has the problem of mechanical strength
Therefore, the existing thermocouple protection sleeve cannot meet the actual needs when used in zinc-aluminum liquid because it cannot solve the problems of corrosion resistance, thermal shock resistance and mechanical strength at the same time.

Method used

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  • Thermo-couple composite protective sleeve and making method thereof

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Embodiment 1

[0028] 316L stainless steel material is used to process and make a thermocouple protection sleeve cylinder with a diameter of 22×450mm and a wall thickness of ≥5mm. Before spraying, use an organic cleaning agent to remove possible oil stains on the surface of the substrate to be sprayed, and use 20 mesh brown corundum sand on the metal cylinder. The body is roughened to make the surface reach an appropriate roughness, and then spray Cr with a thickness of about 0.10mm 3 C 2 -NiCr and 0.15mm MoB / CrCo metal bonded underlayer and 0.20mm composite (MoB / CrCo-Al 2 o 3 ) gradient transition layer, and finally spray 0.15mm of Al 2 o 3 Protective coating.

Embodiment 2

[0030] Use corrosion-resistant gray cast iron alloy material to process and make thermocouple protection casing cylinder body with φ28×450mm and wall thickness ≥8mm. Before spraying, use organic cleaning agent to remove the surface of the substrate to be sprayed, and roughen the metal cylinder body with brown corundum sand. chemical treatment, followed by spraying a MoB / CrCo metal bonding primer with a thickness of about 0.20mm and a composite (MoB / CrCo-Al 2 o 3 ) gradient transition layer, and finally spray 0.20mm Al 2 o 3 Protective coating.

[0031] The above-mentioned thermocouple composite protective sleeve is actually applied to the hot-dip galvanized aluminum production line, and the continuous service life exceeds one month, or even more than two months, which greatly exceeds the 5-day service life of the original thermocouple.

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Abstract

This invention relates to heat couple protection tube and its process method. The heat couple compound protection tube comprises basic tube cylinder and coating, which is characterized by processing the end of the cylinder into arc surface, wherein, the basic cylinder is made of metal and the coating layer is composed of metal combination layer, middle transmission layer and surface work layer; the metal combination layer is of metal ceramics materials or alloy materials similar to the basic cylinder metal property; the surface coating is of oxidation ceramics materials and the middle coating is of metal ceramics materials and oxidation mixture.

Description

(1) Technical field [0001] The invention relates to a thermocouple protection sleeve and a manufacturing method thereof. (2) Background technology [0002] In the hot-dip galvanized aluminum production line, the zinc pot is used for liquid metal heating and heat preservation. The continuous temperature measurement and temperature control method of thermocouple is one of the key factors to ensure the quality of hot-dip products and reduce the consumption of energy, resources and materials. The commonly used thermocouple protection sleeve is made of stainless steel pipe material, and one end is welded and machined. The thermocouple is immersed in the high-temperature zinc-aluminum liquid for a long time. Due to the strong corrosion effect of the zinc-aluminum liquid, the iron-based material will react with the plating solution in the zinc pot and mainly generate Fe 2 Al 5 The service life of thermocouples is usually 3 to 5 days, and the shortest time is only 12 hours. Not o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K7/02
Inventor 徐建明史良权
Owner BAOSHAN IRON & STEEL CO LTD
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