Nanometer mixed powder, high-temperature antioxidant coating and application of nanometer mixed powder and high-temperature antioxidant coating

A high-temperature anti-oxidation and mixed powder technology, which is applied in the field of nano-mixed powder and high-temperature anti-oxidation coatings, can solve the problems of single protection mechanism of anti-oxidation coatings, unsatisfactory anti-oxidation protection effect, narrow applicable temperature range, etc., and achieve excellent Oxidation resistance, excellent thermal stability and crack resistance, effect of lowering sintering temperature

Active Publication Date: 2015-06-10
MAANSHAN XINGDA METALLURGICAL NEW MATERIAL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The purpose of the present invention is to overcome the heat treatment process of domestic existing commonly used iron and steel materials in order to silicate or glass frit (SiO 2 )-based anti-oxidation coatings have a single protection mechanism, and the anti-oxidation protection effect is not ideal. However, due to the large environmental pollution and other shortcomings, a nano-mixed powder, high-temperature anti-oxidation coating and its application are provided.

Method used

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Embodiment 1

[0051] A high-temperature anti-oxidation coating in this embodiment is composed of nano-mixed powder, binder, dispersant and solvent. Among them, the nano-mixed powder is composed of the following components by weight percentage: 75% of silicon nitride nano-powder, 10% of activated carbide, 10% of accelerator, 5% of sintering agent, Si in the above-mentioned silicon nitride nano-powder 3 N 4 The mass fraction of ≧99%, the average particle size is 30nm; the activated carbide is SiC powder and B 4 The combination of C powder, the particle size is 400-500 mesh, wherein, SiC powder and B 4 The mass ratio of C powder is 2:1, and the mass fraction of SiC in SiC powder is ≧80%, B 4 B in C powder 4 The mass fraction of C≧40%; the accelerator powder includes SiO 2 、Al 2 o 3 and K 2 O+Na 2 O, whose particle size is greater than 400 mesh, and SiO 2 、Al 2 o 3 、K 2 O+Na 2 The content of O is respectively 50%, 35% and 15% of the total mass of the accelerator powder; the sinteri...

Embodiment 2

[0070] A high-temperature anti-oxidation coating in this embodiment is composed of nano-mixed powder, silica sol, sodium polyacrylate, bentonite, and deionized water. Among them, the nano-mixed powder is composed of the following components by weight percentage: 60% of silicon nitride nano-powder, 15% of activated carbide, 15% of accelerator, 10% of sintering agent, Si in the above-mentioned silicon nitride nano-powder 3 N 4 The mass fraction of ≧99%, the average particle size is 30nm; the activated carbide is SiC powder and B 4 The combination of C powder, the particle size is 400-500 mesh, wherein, SiC powder and B 4 The mass ratio of C powder is 3:1, and the mass fraction of SiC in SiC powder is ≧80%, B 4 B in C powder 4 The mass fraction of C≧40%; the accelerator powder includes SiO 2 、Al 2 o 3 and K 2 O+Na 2 O, whose particle size is greater than 400 mesh, and SiO 2 、Al 2 o 3 、K 2 O+Na 2 The content of O is respectively 50%, 30% and 20% of the total mass of t...

Embodiment 3

[0082] A high-temperature anti-oxidation coating in this embodiment is composed of nano-mixed powder, silica sol, sodium polyacrylate, bentonite, and deionized water. Among them, the nano-mixed powder is composed of the following components by weight percentage: 50% of silicon nitride nano-powder, 25% of activated carbide, 15% of accelerator, 10% of sintering agent, Si in the above-mentioned silicon nitride nano-powder 3 N 4 The mass fraction of SiC in SiC powder is ≧99%, and the average particle size is 30nm; the activated carbide is SiC powder, and its particle size is 400-500 mesh, wherein, the mass fraction of SiC in SiC powder is ≧80%; the accelerator powder includes SiO 2 、Al 2 o 3 and K 2 O+Na 2 O, whose particle size is greater than 400 mesh, and SiO 2 、Al 2 o 3 、K 2 O+Na 2 The content of O is 55%, 35% and 10% of the total mass of the accelerator powder respectively; the sintering agent is Fe with a mass fraction ≧80% 3 o 4 , and its particle size is greater...

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Abstract

The invention discloses nanometer mixed powder, a high-temperature antioxidant coating and application of the nanometer mixed powder and the high-temperature antioxidant coating, and belongs to the technical field of steel heat treatment antioxidant protection. The high-temperature antioxidant coating comprises the nanometer mixed powder, and the nanometer mixed powder comprises, by weight, 50%-75% of silicon nitride nano-powder, 10%-25% of active carbide, 10%-15% of an accelerant and 5%-10% of an agglutinant, wherein the active carbide is selected from SiC powder, B4C powder and Al4C3 powder, the accelerant comprises SiO2, Al2O3 and K2O+Na2O, and the agglutinant comprises Fe3O4. By means of the high-temperature antioxidant coating, steel metal has the good antioxidant performance during high-temperature heat treatment, the application scope is wider, and the pollution to the environment is small, and the cost is low.

Description

technical field [0001] The invention relates to the technical field of anti-oxidation protection for iron and steel heat treatment, and more specifically relates to a nano-mixed powder, a high-temperature anti-oxidation coating and applications thereof. Background technique [0002] When steel products undergo heat treatment processes such as rolling, forging, quenching, annealing, and normalizing, under normal atmospheric conditions, surface oxidation is prone to occur under high temperature, and it will also be accompanied by the depletion of alloy elements. This phenomenon will have adverse effects on the processing of steel products, such as reduced metal yield, increased energy consumption, increased production costs, and in serious cases, it will also affect the surface quality of processed products. According to statistics, in the thermal processing of iron and steel products in the world, the average loss of iron and steel oxidation is 10%, resulting in a huge waste ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 李国安王建国李寿全
Owner MAANSHAN XINGDA METALLURGICAL NEW MATERIAL
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