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Method for prolonging service life of high-temperature coating on nickel-based alloy

A coating life, nickel-based alloy technology, applied in metal material coating process, coating, solid-state diffusion coating, etc. It is easy to produce cracks and other problems, and achieve the effects of improving oxidation resistance and corrosion resistance, reducing growth stress, and uniform distribution of Pt elements.

Inactive Publication Date: 2019-08-27
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, during the high-temperature oxidation process, the growth of the oxide layer and the interdiffusion between the coating and the substrate will lead to the loss of a large amount of Al, and the interface between the coating and the oxide layer is prone to deformation, forming undulations.
This undulation will increase the internal stress in the oxide layer, making it easy to generate cracks in the oxide layer, and eventually lead to the failure of the coating

Method used

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  • Method for prolonging service life of high-temperature coating on nickel-based alloy
  • Method for prolonging service life of high-temperature coating on nickel-based alloy
  • Method for prolonging service life of high-temperature coating on nickel-based alloy

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Embodiment 1

[0027] A method for improving the service life of a high-temperature coating on a nickel-based alloy, specifically comprising the following steps:

[0028] (1) The sample was polished and cleaned, and then electroplated with Pt; the temperature of the Pt solution during electroplating was 50°C, and the current density was 0.01 A / cm 2 , the deposition time was 1 h, and the thickness of the electroplated Pt was 1 μm; the electroplated samples were cleaned with deionized water and dried.

[0029] (2) The sample after electroplating is embedded and aluminized, and the infiltration agent is composed of aluminum silicon powder and NH 4 F composition, NH in osmotic agent 4 The mass percentage of Cl is 2%; the aluminizing temperature is 1000°C, the temperature is kept for 10h, and the sample is cooled with the furnace.

[0030] (3) Pre-oxidize the sample after aluminizing; the oxidation temperature is 1050 °C, and the oxidation time is 48 h.

[0031] (4) The sample after pre-oxidat...

Embodiment 2

[0035] A method for improving the service life of a high-temperature coating on a nickel-based alloy, specifically comprising the following steps:

[0036] (1) The sample is polished and cleaned, and then electroplated with Pt. The temperature of the Pt solution during electroplating is 45°C, and the current density is 0.05A / cm 2 , the deposition time was 1.5h, and the thickness of the electroplated Pt was 1.5 μm; the electroplated samples were cleaned and dried with deionized water.

[0037] (2) The sample after electroplating is embedded and aluminized, and the infiltration agent is composed of aluminum silicon powder and NH 4 Cl composition, NH in osmotic agent 4 The mass percentage of Cl is 2.5%; the aluminizing temperature is 800°C, the temperature is kept for 6 hours, and the sample is cooled with the furnace.

[0038] (3) Pre-oxidize the sample after aluminizing. The oxidation temperature is 900°C and the oxidation time is 50h.

[0039] (4) The pre-oxidized sample ...

Embodiment 3

[0042] A method for improving the service life of a high-temperature coating on a nickel-based alloy, specifically comprising the following steps:

[0043] (1) The sample is polished and cleaned, and then electroplated with Pt. The temperature of the Pt solution during electroplating is 40°C, and the current density is 0.03A / cm 2, the deposition time was 2 h, and the thickness of the electroplated Pt was 2 μm; the electroplated samples were cleaned with deionized water and dried.

[0044] (2) The sample after electroplating is embedded and aluminized, and the infiltration agent is composed of aluminum silicon powder and NH 4 Cl composition, NH in osmotic agent 4 The mass percentage of Cl is 3%; the aluminizing temperature is 900°C, the temperature is kept for 4 hours, and the sample is cooled with the furnace.

[0045] (3) Pre-oxidize the sample after aluminizing, the oxidation temperature is 100°C, and the oxidation time is 40h.

[0046] (4) The samples after pre-oxidatio...

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Abstract

The invention discloses a method for prolonging the service life of a high-temperature coating on a nickel-based alloy, and belongs to the field of high-temperature protection coatings. The method comprises the following steps of depositing Pt on the surface of a nickel-based high-temperature alloy by using an electroplating method; depositing an aluminide coating on the substrate by virtue of theembedding aluminizing treatment; carrying out pre-oxidation treatment on a sample coated with the modified aluminide coating; and carrying out a cyclic oxidation experiment on the pre-oxidized sampleto obtain the high-temperature coating. According to the method, the high-temperature coating comprises a Pt modified aluminide coating, a HfO2 layer and a dense thermal growth oxidation (TGO) layer,the Pt in the Pt modified coating influences outward diffusion of Hf, so that a continuous HfO2 layer is formed at the interface of the oxidation layer and the coating, the growth rate of the oxidation layer is reduced due to the existence of the continuous HfO2 layer, the bonding performance of the oxidation layer is improved, and the service life of the high-temperature protection coating is prolonged.

Description

technical field [0001] The invention relates to a method for increasing the service life of a high-temperature coating on a nickel-based alloy, belonging to the field of high-temperature protective coatings. Background technique [0002] Nickel-based superalloys are widely used in aero-engines. However, the content of Al and Cr in nickel-based superalloys is relatively low, which leads to poor oxidation resistance and corrosion resistance of nickel-based superalloys. Coating protective coatings (thermal barrier coatings are widely used) on nickel-based alloys is very effective for improving oxidation resistance and corrosion resistance. A protective oxide layer develops between the junction layer and the ceramic layer. The thermal stress and growth stress of the oxide layer will cause crack stress. Once the crack stress is greater than the bond strength of the oxide layer, the oxide layer will fall off. The thermal stress is caused by the mismatch of thermal expansion coe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F17/00C25D3/50C23C10/48C23C10/60C23C8/16C23C8/10
CPCC23F17/00C25D3/50C23C10/48C23C10/60C23C8/16C23C8/10
Inventor 宋鹏吕凯月黄太红陆建生
Owner KUNMING UNIV OF SCI & TECH
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