Novel high-temperature erosion-resistant thermocouple protection sleeve and production method thereof
A technology for protective sleeves and thermocouples, applied to thermometers, measuring heat, and parts of thermometers, etc., can solve the problem of material loss on the surface of thermocouple protective sleeves, the impact of long-term safe operation of boilers, and insufficient high-temperature erosion resistance, etc. Problems, to achieve excellent high temperature salt corrosion resistance, excellent electrochemical corrosion resistance, excellent high temperature erosion resistance effect
Active Publication Date: 2013-04-03
SHANDONG UNIV OF SCI & TECH
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Problems solved by technology
Because the temperature of the measurement point in the furnace is too high and contains a large amount of corrosive gas, a large number of fuel particles in the furnace have the effect of scouring, wearing and corroding the thermocouple, the surface material loss of the thermocouple protection sleeve is serious, and the service life is short
Traditional stainless steel protective sleeves, such as 1Cr18Ni9Ti, 0Cr25Ni20 sleeves, etc., have low manufacturing cost and high temperature resistance can meet the requirements, but the high temperature erosion resistance is insufficient
Applied to circulating fluidized bed boilers, the service life is only 30-90 days, which has a great impact on the long-term safe operation of the boiler
Method used
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[0026] Such as figure 1 As shown, the protection sleeve of the present invention is a FeAl intermetallic compound single-phase coating 2 with a B2 structure on the surface of the austenitic stainless steel thermocouple protection sleeve base 1, and this intermetallic compound coating 2 is directional growth Characteristic columnar B2-FeAl intermetallic compound coating. From Figure 2a and Figure 2b It can be seen that coating 2 has a typical columnar crystal structure, and the coating structure is relatively uniform.
[0027] The preparation method of the present invention will be described in detail below with a specific example, which is not intended to limit the protection scope of the present invention.
[0028] The first step is to select 1.6kg of pure Al powder, 1.1kg of Fe powder and 1.2kg of Ni powder with a purity of ≥99.0% and a particle size of about 70μm (approximately atomic ratio 3:1:1), and put them into a ball mill for 20 minutes. The rotational speed of ...
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The invention discloses a novel high-temperature erosion-resistant thermocouple protection sleeve and a production method thereof. The production method is characterized in that austenitic stainless steel is adopted as a base body, an AlFeNi composite coating layer with atomic ratio to be 3:1:1 is sprayed on the workpiece surface, heat preservation is carried out in a temperature range of 670-700 DEG C for 0.5-1h, then the temperature rises to 950-1000 DEG C and is kept for 3-4h, the workpiece surface is cooled to be at 300 DEG C along with a furnace and taken out for air cooling, and accordingly a FeAl intermetallic compound one-phase coating of a B2 structure and attached onto the surface of the base body of the austenitic stainless steel thermocouple protection sleeve is obtained. The B2-FeAl intermetallic compound coating with orientated growth characteristic columnar crystals is obtained on the surface of the austenitic stainless steel thermocouple protection sleeve so that the high temperature performance, wear resistance and corrosion resistance of the thermocouple protection sleeve are greatly improved, and the thermocouple protection sleeve is especially applicable to surface protection of the temperature measuring thermocouple used by a circulating fluidized bed boiler.
Description
technical field [0001] The invention relates to a preparation technology of a novel high-temperature anti-erosion thermocouple protective casing, which is mainly aimed at the thermocouple protective casing used in high-temperature erosive atmospheres such as circulating fluidized bed boilers. Background technique [0002] In the power industry, thermocouples for temperature measurement are widely used in circulating fluidized bed boilers. Due to the complex working environment in the furnace, special requirements are put forward for the thermocouple protection sleeve, namely wear resistance, high temperature resistance, erosion resistance and corrosion resistance. Due to the high temperature of the measurement point in the furnace and the large amount of corrosive gas, a large number of fuel particles in the furnace have the effect of scouring, wearing and corroding the thermocouple, the surface material of the thermocouple protection sleeve is seriously lost, and the servic...
Claims
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Login to view more IPC IPC(8): G01K1/08C23C4/06C23C4/18C23C4/08C23C4/129C23C4/134G01K7/02
Inventor 王灿明孙宏飞崔洪芝
Owner SHANDONG UNIV OF SCI & TECH
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