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Fe-Al intermetallic compound/AL2O3ceramic composite coating and method of producing the same

An intermetallic compound, ceramic composite technology, applied in the direction of metal material coating process, coating, anodizing, etc., can solve the problems of limited application scope, brittleness, and difficult processing.

Inactive Publication Date: 2008-09-24
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with steel materials, ceramic materials are wear-resistant and corrosion-resistant, but brittle and difficult to process
The plasma spraying method can evenly distribute a certain thickness of ceramic material on the steel surface, which can improve the wear resistance and corrosion resistance of the steel material, but the sprayed ceramic layer is mechanically combined with the substrate, and the bonding strength is low, so it cannot withstand large impacts. force, the range of application is very limited

Method used

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  • Fe-Al intermetallic compound/AL2O3ceramic composite coating and method of producing the same
  • Fe-Al intermetallic compound/AL2O3ceramic composite coating and method of producing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Base material: 3Cr2W8V steel.

[0025] Flame spraying process parameters: the spraying distance is 100mm, the spraying angle is 80°~90°, the moving speed of the spray gun is 15cm / s, the thickness of each spraying is less than 0.10mm, and the coating thickness is 0.50mm.

[0026] Heat treatment process parameters: heating temperature: 600°C, holding time: 40min, cooling method: cooling with the furnace.

[0027] Micro-arc oxidation process parameters: current density at 10A / dm 2 , the solution temperature is 50°C, and the reaction time is 40min.

[0028] Composition of electrolyte: sodium hexametaphosphate 10g / L, sodium silicate 5g / L, sodium tungstate 5g / L, sodium carbonate 5g / L, sodium hydroxide 2g / L.

Embodiment 2

[0030] Base material: H13 steel.

[0031] Flame spraying process parameters: the spraying distance is 150mm, the spraying angle is 80°~90°, the moving speed of the spray gun is 15cm / s, the thickness of each spraying is less than 0.10mm, and the coating thickness is 1.0mm.

[0032] Heat treatment process parameters: heating temperature: 600°C, holding time: 60min, cooling method: cooling with the furnace.

[0033] Micro-arc oxidation process parameters: current density at 10A / dm 2 , the solution temperature is 50°C, and the reaction time is 60min.

[0034] Composition of electrolyte: sodium hexametaphosphate 15g / L, sodium silicate 10g / L, sodium tungstate 10g / L, sodium carbonate 10g / L, sodium hydroxide 5g / L.

Embodiment 3

[0036] Base material: 3Cr2W8V steel.

[0037] Flame spraying process parameters: the spraying distance is 180mm, the spraying angle is 80°~90°, the moving speed of the spray gun is 15cm / s, the thickness of each spraying is less than 0.10mm, and the coating thickness is 0.50mm.

[0038] Heat treatment process parameters: heating temperature: 540°C, holding time: 120min, cooling method: cooling with the furnace.

[0039] Micro-arc oxidation process parameters: current density at 15A / dm 2 , the solution temperature is 30°C, and the reaction time is 60min.

[0040] Composition of electrolyte: sodium hexametaphosphate 12g / L, sodium silicate 8g / L, sodium tungstate 8g / L, sodium carbonate 8g / L, sodium hydroxide 5g / L.

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Abstract

The invention relates to a Fe-Al inter-metallic compound Al2O3 ceramic complex coating and the preparation method thereof, which is characterized in that the Fe-Al inter-metallic compound Al2O3 ceramic complex coating is arranged on a steel base material surface, the total thickness of the coating is between 0.1 mm to 2 mm, the thickness of a micro-arc oxidation Al2O3 ceramic coating is between 50 to 200 Mum. A hot spray method is adopted, an aluminized coating is obtained in the steel base material (electrode) surface, FeAl2 and FeAl phases are formed by reacting in the interface between the aluminized coating and a die cavity surface as well as in the aluminized coating after heat treatment, and a metallurgical bonding is generated between the coating and the die cavity; after the micro-arc oxidation treatment, a Al2O3 ceramic film layer is obtained on the coating surface. The hardness of the ceramic complex coating can reach more than 1200 HV, and the bonding strength between the complex coating and the die cavity reaches more than 250 MPa, and the abrasive resistance is three times of the W18 Cr 4 V steel (64 HRC), and the heat fatigue life is raised more than twice than H 13 steel (47 HRC). The Fe-Al inter-metallic compound Al2O3 ceramic complex coating and the preparation method thereof can be widely used for the surface treatment of die cast dies and the restoration of failure moulds in the die cavity because of abrasive oversize, and can prolong the service life of the die cast dies.

Description

technical field [0001] The present invention relates to a kind of Fe-Al intermetallic compound / Al 2 o 3 Ceramic composite coating and preparation method thereof, the coating which can be obtained on the surface of steel-based material (electrode) has higher bonding strength and hardness, and can greatly improve the wear resistance, corrosion resistance and The thermal fatigue resistance can be widely used in the surface treatment of die-casting molds and the repair of molds that fail due to excessive wear and tear in the cavity, so as to prolong the service life of die-casting molds. Background technique [0002] Wear, corrosion and thermal fatigue are the main failure modes of die-casting molds. In order to improve their service life, surface engineering technology is used to modify the surface of materials. It is one of the most active frontier fields of material science and has become an important link to improve economic benefits. Compared with steel materials, ceramic...

Claims

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Application Information

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IPC IPC(8): B32B33/00B32B9/00C23F17/00C23C4/08C23C4/10C23C4/02C23C4/18C25D11/04C25D11/06C23C4/129C23C4/131
Inventor 周小平胡心彬王立世闫锋
Owner HUBEI UNIV OF TECH
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