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High-entropy alloy composite coating layer for surface protection for aluminum die-casting die

A technology of high-entropy alloy and composite coating, which is applied in the direction of metal material coating process, coating, solid-state diffusion coating, etc. Combined force and other issues to achieve the effect of preventing crack propagation, good interface bonding, and compact structure

Active Publication Date: 2020-02-28
振金镀膜(温州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the high-entropy oxide is directly coated on the aluminum die-casting mold, due to the elastic modulus of the coating on the substrate, the coefficient of expansion, and the lack of chemical affinity between the metal substrate and the high-entropy alloy oxide, it will result in poor adhesion to the film base, limiting The protective effect of high-entropy alloy oxides

Method used

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  • High-entropy alloy composite coating layer for surface protection for aluminum die-casting die

Examples

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Effect test

Embodiment 1

[0026] A method for preparing a high-entropy alloy composite coating for surface protection of an aluminum die-casting mold, comprising the following preparation steps:

[0027] Step 1: Select the aluminum alloy die-casting mold as the base material, select corundum sand with a grit size of 320 mesh, and perform sandblasting treatment on the aluminum alloy die-casting mold under the air pressure of 2 Bar to remove the passivation layer on the surface; Grind the aluminum alloy die-casting mold with 300, 400, 600, and 800 sandpaper; then use a polishing cloth wheel to mix diamond grinding powder and grinding diamond powder olive oil for grinding and fine polishing. The diamond powder has a particle size of 0.5 μm; use automatic ultrasonic cleaning , the specific process is to spray and clean the aluminum alloy die-casting mold with lye for 10 minutes, the pressure during leaching is 3kg / cm2, and then place the leached aluminum alloy die-casting mold in lye at 80°C and perform ult...

Embodiment 2

[0035] A method for preparing a high-entropy alloy composite coating for surface protection of an aluminum die-casting mold, comprising the following preparation steps:

[0036] Step 1: Select the aluminum alloy die-casting mold as the base material, select corundum sand with a grit size of 400 mesh, and perform sandblasting treatment on the aluminum alloy die-casting mold under an air pressure of 4 Bar to remove the passivation layer on the surface; 300, 400, 600, 800 sandpaper to polish the aluminum alloy die-casting mold; then use a polishing cloth wheel to mix diamond grinding powder and grinding diamond powder olive oil for grinding and fine polishing. The diamond powder has a particle size of 1 μm; use automatic ultrasonic cleaning, The specific process is to spray and clean the aluminum alloy die-casting mold with lye for 20 minutes, the pressure during rinsing is 3kg / cm2, and then place the leached aluminum alloy die-casting mold in 86°C lye and perform ultrasonic clean...

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Abstract

The invention discloses a high-entropy alloy composite coating layer for surface protection for an aluminum die-casting die. The essential of the technical scheme is as follows: the high-entropy alloycomposite coating layer for surface protection for the aluminum die-casting die comprises a Ti priming layer, a CrAlN barrier layer, a CrAlNbN-CrAlSiN support layer with a gradient structure, and a CrAlNbSiON function layer which are sequentially deposited on the surface of the aluminum alloy die-casting die, wherein the CrAlNbN-CrAlSiN support layer with the gradient structure is a multi-periodcoating layer forming a cycle period from a CrAlNb layer to a CrAlSi layer; and the content of Nb element in the CrAlNbN-CrAlSiN support layer with the gradient structure is gradually increased from the CrAlN barrier layer to the CrAlNbSiON function layer, and the content of Si element is gradually reduced. The high-entropy alloy composite coating layer is compact in structure, good in interface bonding, not liable to crack and peel off, and good in anti-crack effect; and on top of increasing the hardness of the coating layer, Nb is beneficial to compaction for the coating layer, and further improves the toughness, the high-temperature corrosion resistance, the oxidation resistance and other performance of the coating layer.

Description

technical field [0001] The invention relates to the field of die-casting mold surface protection, in particular to a high-entropy alloy composite coating applied to the surface of an aluminum alloy die-casting mold. Background technique [0002] In the aluminum alloy die-casting forming process of the automobile industry, the aluminum die-casting mold is faced with the combined effects of liquid alloy corrosion, high-temperature wear, thermal fatigue, and oxidation. It causes a series of problems such as high-temperature metal liquid pollution, material cracking and surface adhesion. [0003] High-entropy oxide coatings have outstanding advantages in high-temperature oxidation resistance and wear resistance due to their thermodynamic high-entropy effects and crystallographic slow-diffusion effects. [0004] Applying high-entropy oxide coatings to the surface protection of aluminum die-casting molds has a good application prospect. If the high-entropy oxide is directly coat...

Claims

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Application Information

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IPC IPC(8): C23C14/16C23C14/06C23C14/02C23C14/32C23C8/24C23C14/35
CPCC23C14/16C23C14/0021C23C14/0641C23C14/0036C23C14/0676C23C14/022C23C14/028C23C8/24C23C14/325C23C14/027
Inventor 黄志宏
Owner 振金镀膜(温州)有限公司
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