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Method for preparing platinum-aluminum coating

A technology of aluminum coating and aluminizing, which is applied in the direction of coating, metal material coating process, solid diffusion coating, etc., can solve the problem that the aluminized coating cannot be used for a long time, and achieve the potential of prolonging the life of the engine and increasing the adhesion Sexuality, anti-diffusion effect

Active Publication Date: 2021-02-02
CHINA HANGFA SOUTH IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a method for preparing a platinum-aluminum coating to solve the technical problem that the aluminized coating prepared in the prior art cannot be used for a long time above 950°C

Method used

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  • Method for preparing platinum-aluminum coating
  • Method for preparing platinum-aluminum coating
  • Method for preparing platinum-aluminum coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The method for preparing the platinum-aluminum coating of the present embodiment specifically comprises the following steps:

[0048] (1) Platinum electroplating: Platinum electroplating with a thickness of 6 μm is applied to parts of DD412 single crystal alloy materials that require platinum-aluminum coatings;

[0049] It is required that the electroplating platinum layer has no defects such as peeling, wrinkles and peeling;

[0050] (2) Cleaning: Clean up the oil and other dirt on the surface of the parts;

[0051] In step (2), corundum sand with a particle size of less than or equal to 200 meshes is used at a pressure of 1 × 10 5 Dry sand blowing under the condition of Pa to remove surface dirt.

[0052] (3) Pre-diffusion treatment: put the parts under vacuum pressure ≤ 1.33×10 -1 Pa, heat preservation in a vacuum furnace at a temperature of 1000°C for 2 hours;

[0053] In this step, the role of pre-diffusion is to allow the platinum-coated layer to interdiffuse ...

Embodiment 2

[0067] The method for preparing a platinum-aluminum coating of the present invention specifically comprises the following steps:

[0068] (1) Platinum electroplating: Platinum electroplating with a thickness of 4 μm is applied to the parts of DD412 single crystal alloy material parts that need to be prepared with platinum-aluminum coating;

[0069] It is required that the electroplating platinum layer has no defects such as peeling, wrinkles and peeling;

[0070] (2) Cleaning: Clean up the oil and other dirt on the surface of the parts;

[0071] In step (2), corundum sand with a particle size less than or equal to 200 meshes can be used under a pressure of 1.5×10 5 Dry sand blowing under the condition of Pa to remove surface dirt.

[0072] (3) Pre-diffusion treatment: put the parts under vacuum pressure ≤ 1.33×10 -1 Pa, the temperature is 950 ° C for 2.5 hours;

[0073] In step (3), pre-diffusion treatment is performed in a vacuum furnace.

[0074] In this step, the role ...

Embodiment 3

[0091] The method for preparing a platinum-aluminum coating of the present invention specifically comprises the following steps:

[0092] (1) Platinum electroplating: Platinum electroplating with a thickness of 8 μm is applied to parts of single crystal alloy materials that need to be prepared with a platinum-aluminum coating;

[0093] It is required that the electroplating platinum layer has no defects such as peeling, wrinkles and peeling;

[0094] (2) Cleaning: Clean up the oil and other dirt on the surface of the parts;

[0095] In step (2), corundum sand with particle size less than or equal to 200 meshes can be used, and the pressure is 1×10 5 Dry sand blowing under the condition of Pa to remove surface dirt.

[0096] (3) Pre-diffusion treatment: put the parts under vacuum pressure ≤ 1.33×10 -1 Pa, the temperature is 1050 ℃ and kept for 1.5h;

[0097] In step (3), pre-diffusion treatment is performed in a vacuum furnace.

[0098] In this step, the role of pre-diffus...

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Abstract

The invention discloses a method for preparing a platinum-aluminum coating. The method comprises the following steps of (1) platinum electroplating; (2) part surface dirt clearing; (3) pre-diffusion treatment; (4) penetrating agent preparation; (5) high-temperature gas-phase aluminizing, wherein a part and an aluminizing permeating agent are subjected to heat preservation for 5-7 hours at the temperature of 1,000-1,100 DEG C for high-temperature gas-phase aluminizing to obtain an aluminized part; and (6) sand blasting cleaning to obtain the part with the platinum-aluminum coating. The platinum-aluminum coating can be applied to a turbine part of a new-generation turboprop / turboshaft engine, so that the use temperature is increased, and the service life is prolonged; and due to modificationof the Pt element, the service temperature of the coating can be increased to 1,100 DEG C, and the coating can be used for a long time at the temperature of 950 DEG C or above.

Description

technical field [0001] The invention relates to a method for preparing a platinum-aluminum coating, in particular to a method for preparing a platinum-aluminum coating by using high-temperature gas-phase aluminizing. Background technique [0002] Engine turbine blades usually adopt aluminized coating to improve their resistance to high temperature oxidation and gas corrosion. During the use of the coating, changes occur at the two interfaces of the coating-medium and the coating-matrix alloy. The general trend of the change is The concentration of elements on which the protective oxide film is formed decreases gradually, so that the protective oxide film cannot be formed in the end, so the coating fails. The single aluminized coating has good resistance to high temperature oxidation and gas corrosion at 900 ° C. Its use The time can reach more than 1000 hours, but above 950°C, the coating-substrate interface interaction is significantly accelerated, which limits the long-ter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/50C25D5/48C23C10/08
CPCC25D3/50C25D5/48C23C10/08
Inventor 张正义张晓锋王国奇魏九高寻丹彭敬
Owner CHINA HANGFA SOUTH IND CO LTD
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