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Al2O3-MgO-SiAlON common steel heat treatment anti-oxidation coating and use method thereof

A technology for anti-oxidation coatings and ordinary steel, applied in the direction of fire-proof coatings, coatings, etc., can solve the problems of poor chemical stability, easy cracking and falling off, etc., achieve low thermal expansion rate, not easy cracking and falling off, and reduce oxidation burning.

Inactive Publication Date: 2017-05-10
长兴天晟能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the problems of poor chemical stability and easy cracking and falling off of existing common steel heat treatment anti-oxidation coatings, and provide a kind of Al coating with good high temperature resistance and cohesiveness. 2 o 3 -MgO-SiAlON ordinary steel heat treatment anti-oxidation coating

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] a kind of Al2 o 3 - MgO-SiAlON common steel heat treatment anti-oxidation coating, is made up of the raw material of following weight part: Al 2 o 3 -MgO-SiAlON powder 30 parts, Cr 2 o 3 3 parts, 20 parts of composite binder, 0.5 parts of potassium fluoroborate, 0.5 parts of boron carbide, and the particle size of the above components is 300 mesh.

[0033] where Al 2 o 3 -MgO-SiAlON powder is prepared by the following method:

[0034] (1) The weight parts are respectively 20 parts of corundum, 14 parts of MgO powder, 10 parts of pinnacle and 6 parts of β-SiAlON powder. The mass ratio of base material and dehydrated alcohol is 1.5: 1;

[0035] (2) Dry the mixture after ball milling in step (1) at 50°C, and then dry mix for 30 minutes;

[0036] (3) The dry-blended mixture was pressed into shape with a pressure of 50 MPa, firstly baked at 150°C for 4 hours, then placed in a microwave high-temperature atmosphere furnace, kept at 1400°C for 3 hours under the conditio...

Embodiment 2

[0045] a kind of Al 2 o 3 - MgO-SiAlON common steel heat treatment anti-oxidation coating, is made up of the raw material of following weight part: Al 2 o 3 -MgO-SiAlON powder 40 parts, Cr 2 o 3 4 parts, 25 parts of composite binder, 1 part of potassium fluoroborate, 1 part of boron carbide, the particle size of each of the above components is 400 mesh.

[0046] where Al 2 o 3 -MgO-SiAlON powder is prepared by the following method:

[0047] (1) The base material which is uniformly mixed with 25 parts of corundum, 17 parts of MgO powder, 15 parts of pinnacle and 10 parts of β-SiAlON powder in parts by weight is placed in a ball mill jar and ball milled for 4 hours with absolute ethanol as the medium, wherein The mass ratio of base material and dehydrated alcohol is 1.7: 1;

[0048] (2) Dry the mixture after ball milling in step (1) at 600°C, and then dry mix for 35 minutes;

[0049] (3) The dry-blended mixture was pressed into shape with a pressure of 50MPa, firstly ba...

Embodiment 3

[0058] a kind of Al 2 o 3 - MgO-SiAlON common steel heat treatment anti-oxidation coating, is made up of the raw material of following weight part: Al 2 o 3 -50 parts of MgO-SiAlON powder, Cr 2 o 3 5 parts, 30 parts of composite binder, 1.5 parts of potassium fluoroborate, 1.5 parts of boron carbide, and the particle size of the above components is 500 mesh.

[0059] where Al 2 o 3 -MgO-SiAlON powder is prepared by the following method:

[0060] (1) 30 parts by weight of corundum, 20 parts of MgO powder, 20 parts of pinnacle and 12 parts of β-SiAlON are mixed uniformly. The powder is placed in a ball mill jar and ball milled for 5 hours with absolute ethanol as the medium. The mass ratio of base material and dehydrated alcohol is 2: 1;

[0061] (2) Dry the mixture after ball milling in step (1) at 80°C, and then dry mix for 40 minutes;

[0062] (3) The dry-blended mixture was pressed into shape with a pressure of 60MPa, firstly baked at 180°C for 6h, then placed in a ...

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Abstract

The invention discloses an Al2O3-MgO-SiAlON common steel heat treatment anti-oxidation coating and a use method thereof. The coating comprises, by weight, 30-50 parts of Al2O3-MgO-SiAlON powder, 3-5 parts of Cr2O3, 20-30 parts of compound binders, 0.5-1.5 parts of potassium fluoborate and 0.5-1.5 parts of boron carbide. The Al2O3-MgO-SiAlON powder serves as a filler of the coating, high-temperature resistance and chemical stability of the coating are improved, high-temperature stability and viscosity of the compound binders prepared from phthalocyanine resin prepolymer are enhanced, the coating does not easily crack or fall off, and high-temperature oxidation resistance of the coating is enhanced. The coating can be sprayed or brushed on the surface of a steel billet at the temperature ranging from room temperature to 500 DEG C, the coating can naturally fall off in the cooling process after hot processing, and phosphorus removal difficulty is reduced.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to an Al 2 o 3 -MgO-SiAlON common steel heat treatment anti-oxidation coating and its application method. Background technique [0002] In the current steel rolling process, whether it is ordinary steel or special steel, during heat treatment processes such as rolling, forging, quenching, annealing, and normalizing, surface oxidation is prone to occur under high temperature, and it will also be accompanied by alloy elements. depletion and decarbonization. This phenomenon directly restricts the improvement of rolled steel yield and affects the surface quality of finished steel. At present, there are high-temperature coating method, vacuum method and protective atmosphere method to prevent iron and steel products from oxidation and burning. The vacuum method and the protective atmosphere method are to place the steel products in a vacuum environment or an inert gas protection env...

Claims

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Application Information

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IPC IPC(8): C09D179/04C09D7/12C08G73/06
CPCC08G73/0672C08K3/00C08K3/22C08K3/34C08K2003/222C08K2003/2227C09D5/18C09D7/61C09D179/04
Inventor 佘海中
Owner 长兴天晟能源科技有限公司
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