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Alloy coating resistant to high temperature oxidation and sulfur and chlorine corrosion and preparation method thereof

A technology of high temperature oxidation resistance and alloy coating, which is applied in the direction of metal material coating process, coating, molten spraying, etc., can solve the problem of large difference in thermal expansion coefficient, unfavorable combination, and difficulty in achieving satisfactory high temperature oxidation resistance and corrosion resistance and other problems, to achieve the effect of increasing the density, improving the bonding performance, and improving the anti-coking performance

Active Publication Date: 2020-05-19
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the thermal expansion coefficient of the ceramic material and the metal base material of the riser is quite different, and stress is easily generated at the contact interface during the heating and cooling process, which is not conducive to the combination of the two
It is also difficult to achieve satisfactory high temperature oxidation resistance and corrosion resistance with NiAl, NiCr, CoNiCrAlY and other alloy coatings.

Method used

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  • Alloy coating resistant to high temperature oxidation and sulfur and chlorine corrosion and preparation method thereof
  • Alloy coating resistant to high temperature oxidation and sulfur and chlorine corrosion and preparation method thereof
  • Alloy coating resistant to high temperature oxidation and sulfur and chlorine corrosion and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] (1) The substrate is a superalloy. Pretreatment of the surface of the metal substrate to be sprayed: sandblasting, ultrasonic cleaning, compressed air drying.

[0053] (2) The CoNiMoCrAlSiY alloy powder is deposited on the surface of the metal substrate by atmospheric plasma process. The composition of the alloy powder is Ni: 25wt%, Mo: 10wt%, Cr: 15wt%, Al: 6wt%, Si: 2wt%, Y: 0.5wt%, Co: balance. Spraying parameters are: argon flow rate 40slpm, hydrogen flow rate 9slpm, current 600A, power 45kW, powder delivery carrier gas flow rate 3.0slpm, powder delivery rate 35g / min, spraying distance 120mm.

[0054] figure 1 The digital photos and cross-sectional SEM images of the obtained samples show that the thickness of the coating is about 110 μm, and the coating is tightly combined with the substrate. The bond strength test was carried out on the sample, and the test value was 61.2±1.5MPa. The thermal conductivity of the coating is 19.4W / (m K) (600°C), indicating that th...

Embodiment 2

[0056] The preparation method is the same as in Example 1, and the resulting sample is thermally shocked 50 times (900° C. to room temperature). figure 2 Digital photos and cross-sectional SEM images of coating samples after thermal shock. After thermal shock, the coating is intact without cracks or peeling off. The bond strength test was carried out on the sample after thermal shock, and the test value was 52.9±4.2MPa.

Embodiment 3

[0058] (1) The base material is the solid part of the rising pipe used in the raw gas sensible heat recovery project.

[0059] (2) The CoNiMoCrAlSiY alloy powder is deposited on the inner wall of the riser pipe for the sensible heat recovery project of the treated crude gas by using the atmospheric plasma process. The composition of the alloy powder is Ni: 25wt%, Mo: 10wt%, Cr: 15wt%, Al: 6wt%, Si: 2wt%, Y: 0.5wt%, Co: balance. Spraying parameters are: argon flow rate 35 slpm, hydrogen flow rate 5 slpm, current 400A, power 32kW, powder delivery carrier gas flow rate 3.0 slpm, powder delivery rate 35g / min.

[0060] (3) Service the riser with inner wall coating for 1 year under the actual working condition. An anatomical analysis of the riser was carried out after service, and the SEM image of the section of the coating sample intercepted is as follows: image 3 shown. After service, the coating is intact and still tightly bonded to the substrate.

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Abstract

The invention relates to a high-temperature oxidation resisting and sulfur and chlorine corrosion resisting alloy coating and a preparation method thereof. The component of the alloy coating is CoNiMoCrAlSiY, namely including 25wt% to 35wt% of Ni, 10wt% to 30wt% of Mo, 15wt% to 25wt% of Cr, 3wt% to 9wt% of Al, 1wt% to 4wt% of Si, 0.1wt% to 0.5wt% of Y and the balance of Co.

Description

technical field [0001] The invention relates to an alloy coating resistant to high temperature oxidation and sulfur and chlorine corrosion and a preparation method thereof, belonging to the technical field of thermal spraying alloy coatings. Background technique [0002] The coke oven is a thermal furnace with high efficiency in the energy conversion device. The heat loss of the coke oven is composed of four parts: the heat brought out by red coke accounts for about 37% of the heat loss of the coke oven, which has been recycled through CDQ technology The heat brought out by coke oven flue gas accounts for about 17%, which has been recycled through coal humidity control or heat pipe technology; the heat loss on the surface of the furnace body accounts for about 10%, which is reduced by furnace insulation; only the heat taken out accounts for about 36% The raw coal gas (unpurified gas) with heat loss, and the remaining heat has not been fully recovered. Raw coal gas is the ga...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/134C23C4/073
CPCC23C4/06C23C4/134
Inventor 邵芳赵华玉倪金星陶顺衍庄寅杨加胜钟兴华杨凯盛靖
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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