Antioxidant coating applied to high-temperature alloy heat treatment

A technology for anti-oxidation coatings and high-temperature alloys, which is applied in the field of high-temperature anti-oxidation coatings, can solve the problems of high price of anti-oxidation coatings, easy to fall off, and the anti-oxidation performance of coatings needs to be improved, and achieves increased strength, anti-oxidation, and adhesion. Good and good antioxidant effect

Inactive Publication Date: 2010-06-16
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] In order to solve the problems that the anti-oxidation coating is expensive in the heat treatment process of the current steel alloy slab, the anti-oxidation performance of the coa

Method used

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  • Antioxidant coating applied to high-temperature alloy heat treatment
  • Antioxidant coating applied to high-temperature alloy heat treatment
  • Antioxidant coating applied to high-temperature alloy heat treatment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Paint ratio by weight percentage: 88% mid-grade magnesia, 3.8% pigment grade Cr 2 o 3 ,; 3% industrial aluminum powder, 4% sodium tripolyphosphate, 0.2% graphite powder, 1% Fe 2 o 3 . Then add sodium polyacrylate, 4% colloidal silica, and 15% water, accounting for 4% of the mass of the above-mentioned solid powder.

[0035] Coating process: Spray the paint onto the surface of the billet with a pressure spray gun. The temperature of the billet is preferably above 100°C, so that the coating can dry quickly and form a film. The thickness of the sprayed coating is measured by a thickness gauge at 0.8-1.5mm, and the minimum thickness cannot be less than 0.5mm. The substrate does not require any pre-treatment, and there is no need to remove the oxide skin on the surface. The oxide skin on the surface can promote the formation of a protective coating at high temperatures.

[0036] Heating conditions: use a silicon molybdenum rod heating furnace, heat up to 1400°C in 2 hou...

Embodiment 2

[0038] Paint ratio: 89.9% mid-grade magnesia, 2.5% pigment grade Cr 2 o 3 ,; 2% industrial aluminum powder, 4.5% sodium tripolyphosphate, 1% Fe 2 o 3 , 0.1% graphite powder. Then add sodium polyacrylate, 5% colloidal silica, and 15% water, accounting for 4% of the mass of the above-mentioned solid powder.

[0039] Coating process: The coating is sprayed onto the surface of the steel slab with a pressure spray gun, the thickness is about 1mm, dried at room temperature or the temperature of the cast slab is above 100°C, the substrate temperature promotes drying and film formation, and the sprayed thickness is measured by a thickness gauge at 0.8 ~1.5mm, the minimum thickness cannot be less than 0.5mm.

[0040] Substrate: There is no need for any pre-treatment, and no need to remove the oxide skin on the surface.

[0041] Heating equipment: In the walking beam heating furnace, water vapor is the atomizing medium and heavy oil is the fuel.

[0042] Heating conditions: 1350℃~...

Embodiment 3

[0045] Coating ratio: 90% mid-grade magnesia, 1.5% pigment grade Cr 2 o 3 , 2.5% Pigment Grade Fe 2 o 3 , 2.5% industrial aluminum powder, 3.4% sodium tripolyphosphate, 0.1% graphite powder, then add sodium polyacrylate accounting for 4% of the above-mentioned solid powder mass, 5% colloidal silica, and 15% water.

[0046] Coating process: Coat the paint on the low-carbon alloy steel slab with a thickness of about 1mm, dry it at room temperature or the casting slab at a temperature above 100°C, spray it on the surface of the substrate, and dry it with the temperature of the substrate to form a film. The thickness of the spray coating measured by the thickness gauge is 0.8-1.5mm, and the minimum thickness cannot be less than 0.5mm.

[0047] Substrate: There is no need for any pre-treatment, and no need to remove the oxide skin on the surface.

[0048] Heating equipment: silicon molybdenum rod heating furnace, in the environment of air as the medium.

[0049] Heating condit...

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Abstract

The invention belongs to the technical field of preparing high-temperature antioxidant coating, and develops a high-temperature oxidation resistant coating on the basis of researching steel alloy plate blank heat treatment process, which is especially applicable to high-temperature long-time insulation heat treatment process of silicon steel and the like. The antioxidant coating applied to high-temperature alloy heat treatment is characterized by comprising the following components by mass ratio: solid powder ratio: 85-92% of magnesia, 0.5-5% of chromium sesquioxide, 2-5% of sodium tripolyphosphate, 1-4% of industrial aluminum powder and 0.1-1% of graphite; and sodium polyacrylate accounting for 2-4wt% of the solid powder, ludox solution accounting for 4-5wt% of the solid powder, and water accounting for 15-25wt% of the solid powder. The method has simple process, low cost and good adhesion of the prepared coating, and can further help improve protectiveness on matrix.

Description

technical field [0001] The invention belongs to the technical field of high-temperature oxidation-resistant coating preparation. Based on the research on the heat treatment process of steel alloy slabs, a high-temperature oxidation-resistant coating is developed, which is especially suitable for high-temperature and long-term thermal insulation heat treatment processes such as silicon steel. Background technique [0002] The invention relates to an anti-oxidation coating for heat treatment of steel alloy slabs (mainly silicon steel, low-carbon steel and nickel-chromium low-alloy steel). The paint is formulated with industrial magnesia as the main raw material, adding a small amount of pigment-grade chromium trioxide, silica sol, inorganic and binder. [0003] Generally, basic refractory materials are mainly composed of magnesium oxide and calcium oxide, and magnesium bricks are commonly used. Magnesia bricks containing more than 80% to 85% of magnesium oxide have good resis...

Claims

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Application Information

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IPC IPC(8): C21D1/68
Inventor 孔祥华段方苗权继锋沈奎刘虎
Owner UNIV OF SCI & TECH BEIJING
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