Novel high-temperature erosion-resistant thermocouple protection sleeve and production method thereof
A technology for protective sleeves and thermocouples, applied in thermometers, measuring heat, and parts of thermometers, etc., can solve the loss of material 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
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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 substrate 1, and this intermetallic compound coating 2 is directional growth Characteristic columnar B2-FeAl intermetallic compound coating. from Figure 2a with 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 ≥ 99.0% and a particle size of about 70 μm (approximately atomic ratio 3:1:1), and put them into a ball mill for 20 minutes. The rotational spee...
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