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A high-temperature thermal shock-resistant and thermal-corrosion-resistant coating for stainless steel and heat-resistant steel and its preparation method

A technology of heat-resistant steel and stainless steel, which is applied in the field of high-temperature thermal shock-resistant and thermal-corrosion-resistant surface coatings, and can solve the problems of increasing the cost of use and low-nickel alloys that cannot achieve good thermal-corrosion resistance.

Active Publication Date: 2018-01-02
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The shortcoming of above-mentioned coating is: 1) can not play good anti-hot corrosion effect for low-nickel alloy
2) The raw materials used are not minerals, which increases the cost of use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A glass-ceramic coating with a thickness of 100 μm is coated on the surface of 201 stainless steel by pulling and dipping method. The weight percentage of glass-ceramic coating raw materials is: 10% silica microstone, 35% blast furnace slag, 4% fluorite, and Destone 26%, zircon sand 1%, borax 20%, MxOy 4%, where M is Mo, and the average particle size of raw materials is 5 μm. The three-stage high-temperature heating is to rise to 300°C within 30 minutes, rise to 900°C within 50 minutes, rise to 1100°C within 30 minutes, keep warm for 30 minutes, and then cool down in three stages. The cooling program is 40°C / s to room temperature. The coated 201 stainless steel exhibits good oxidation resistance and hot corrosion resistance at 1100°C, and no cracking and peeling of the coating is observed after oxidation / corrosion for 12 hours. Thermal shock resistance, no cracking of the coating was found in 40 cold and hot cycles; while 201 stainless steel without coating was oxidized...

Embodiment 2

[0016] A glass-ceramic coating with a thickness of 100 μm is coated on the surface of 302 stainless steel by pulling and dipping method. The weight percentage of glass-ceramic coating raw materials is: 35% silica microstone, 10% blast furnace slag, 2% fluorite, and montmorillonite 28% of stone, 3% of zircon sand, 18% of borax, 4% of MxOy, wherein M is Ni, and the average particle size of raw materials is 6μm. The three-stage high-temperature heating is to rise to 300°C within 30 minutes, to 900°C within 50 minutes, to 1100°C within 30 minutes, to keep warm for 20 minutes, and then to lower the temperature in three stages. The cooling program is 40°C / s to room temperature. The coated 302 stainless steel exhibits good oxidation resistance and thermal corrosion resistance at 1250°C, and no cracking or peeling of the enamel coating is seen after oxidation / corrosion for 15 hours. Thermal shock resistance, no cracking of the coating was found after 40 cold and hot cycles; while 302 ...

Embodiment 3

[0018] Apply a layer of glass-ceramic coating with a thickness of 100 μm on the surface of 310s steel by brushing. The weight percentage of glass-ceramic coating raw materials: 20% silica microstone, 28% blast furnace slag, 4% fluorite, montmorillonite 22% stone, 6% zircon sand, 18% borax, 2% MxOy, where M is Mo, and the average particle size of raw materials is 5 μm. The three-stage high-temperature heating is raised to 400°C within 30 minutes, raised to 1000°C within 50 minutes, raised to 1050°C within 30 minutes, kept for 30 minutes, and then the temperature is lowered in three stages. The cooling program is 50°C / s to room temperature. The 310s stainless steel after coating exhibits good oxidation resistance and hot corrosion resistance at 1250 °C, no cracking and peeling of the coating are seen after oxidation / corrosion for 12 hours, and it shows good resistance to cycling from normal temperature to 1100 °C Thermal shock resistance, no cracking of the coating was found aft...

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Abstract

The invention relates to a high-temperature thermal shock-resistant and thermal-corrosion-resistant coating for stainless steel and heat-resistant steel and a preparation method thereof, which is characterized in that a layer with a thickness of 10-200 μm is fired on the surface of the stainless steel and heat-resistant steel substrate Glass-ceramic coating, percentage by weight of raw materials for glass-ceramic coating: silica microstone 10-40%, blast furnace slag 10-35%, fluorite 2-5%, montmorillonite 10-40%, zircon sand 1 ~8%, borax 10~20%, MxOy 1~4%, wherein M is Mo or Al or Ni. This glass-ceramic raw material needs to be composed through crushing, drying, ball milling and other processes. Glass-ceramic coating raw materials can be coated on the surface of stainless steel and heat-resistant steel substrates by pulling dipping or spraying or brushing, and then undergo three-stage high-temperature heating and three-stage controlled cooling to obtain a glass-ceramic coating. The coating can effectively protect the stainless steel and heat-resistant steel substrates, greatly improve the high-temperature thermal shock resistance and thermal corrosion resistance of the stainless steel and stainless steel, improve the service life of the steel, and greatly reduce the overall cost.

Description

technical field [0001] The invention relates to metal protection technology, and in particular provides a surface coating technology for high-temperature thermal shock resistance and thermal corrosion resistance of stainless steel and heat-resistant steel. Background technique [0002] Stainless steel and heat-resistant steel are widely used in construction, machinery manufacturing, nuclear industry and other fields. Under harsh working conditions such as heating furnaces and flues with high-temperature corrosion, the surface corrosion of such steel components is severe, ranging from cracks to early lamellar oxidation and peeling of the surface of stainless steel and heat-resistant steel, which greatly limits the corrosion resistance of stainless steel. And the use of heat-resistant steel has a serious impact on the service life of the steel. Among them, thermal shock resistance is particularly important, and its quality is directly related to the degree of surface oxidatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C10/00C23D5/00C03C6/10
Inventor 魏连启单欣仉小猛叶树峰陈运法
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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