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Blade surface pitting corrosion resistant coating and preparation method thereof

A surface layer and blade technology, applied in coatings, blade support elements, metal material coating technology, etc., can solve the problems of poor bonding strength between the coating and the substrate, large internal stress of the coating, etc., and achieve good wear resistance , improved corrosion resistance, good coating and substrate bonding effect

Inactive Publication Date: 2012-03-28
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the difference in thermal physical and mechanical properties between the coating and the substrate material, the single-layer TiCN coating will cause excessive internal stress in the coating during the coating preparation and cooling process, and the bonding strength between the coating and the substrate will be poor.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] In this example, an anti-pitting coating is deposited on the surface of X12CrMoWVNbN10-1-1 heat-resistant steel blades. The specific preparation method is as follows:

[0024] Step 1: Place the X12CrMoWVNbN10-1-1 heat-resistant steel blade substrate in an ultrasonic cleaning machine filled with acetone solution for ultrasonic cleaning, where the concentration of the acetone solution is 99.99%, and the cleaning time is 20 minutes; Drying after dehydration treatment in water ethanol solution;

[0025] Step 2: Fix the X12CrMoWVNbN10-1-1 heat-resistant steel blade substrate processed in step 1 on the cylindrical workpiece rod of the furnace body of the arc ion coating machine; carry out rough vacuuming on the furnace body, and then turn on the heater to make the furnace The temperature of the body rises to 350°C, and the furnace body is evacuated synchronously during the heating process, so that the vacuum degree of the furnace body is 6.7×10 -3 Pa;

[0026] Step 3: Keep ...

Embodiment 2

[0034] This embodiment is to deposit an anti-pitting coating on the surface of a 1Cr-0.5Mo steel blade, and the specific preparation method is as follows:

[0035] Step 1: Place the blade substrate in an ultrasonic cleaning machine filled with acetone solution for ultrasonic cleaning, wherein the concentration of the acetone solution is 99.9%, and the cleaning time is 30 minutes; immerse the cleaned blade substrate in absolute ethanol solution for dehydration and then dry ;

[0036] Step 2: Fix the blade substrate treated in step 1 on the cylindrical workpiece rod of the furnace body of the arc ion coating machine; carry out rough vacuuming on the furnace body, and then turn on the heater to raise the temperature of the furnace body to 250°C and heat During the process, the furnace body is evacuated synchronously, so that the vacuum degree of the furnace body is 5×10 -3 Pa;

[0037] Step 3: Keep the temperature of the furnace body constant, feed argon gas with a purity of 99...

Embodiment 3

[0045] In this embodiment, an anti-pitting coating is deposited on the surface of a 1Cr-1Mo-0.25V steel material blade, and the specific preparation method is as follows:

[0046] Step 1: Place the blade substrate in an ultrasonic cleaning machine filled with acetone solution for ultrasonic cleaning, wherein the concentration of the acetone solution is 99.99%, and the cleaning time is 20 minutes; immerse the cleaned blade substrate in absolute ethanol solution for dehydration and then dry ;

[0047] Step 2: Fix the blade substrate treated in step 1 on the cylindrical workpiece rod of the furnace body of the arc ion coating machine; carry out rough vacuuming on the furnace body, and then turn on the heater to raise the temperature of the furnace body to 450°C and heat During the process, the furnace body is evacuated synchronously, so that the vacuum degree of the furnace body is 6×10 -3 Pa;

[0048] Step 3: Keep the temperature of the furnace body constant, feed argon gas wi...

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Abstract

The invention discloses a blade surface pitting corrosion resistant coating and preparation method thereof. The coating comprises a bonding layer, a blocking layer, and a surface layer from the inside to the outside, wherein, the bonding layer consists of pure metal Ti, the blocking layer consists of TiN and TiC from the inside to the outside, and the surface layer consists of TiCN. The preparation method is characterized by using an arc ion plating machine to successively depositing the bonding layer, the blocking layer, and the surface layer on the blade matrix. The multi-layer pitting corrosion resistant coating structure disclosed herein has low friction coefficient, high hardness, good wear resistance, good bonding force between the coating and the substrate, and excellent pitting corrosion resistance. According to the invention, in the preparation process, vacuum degree of the furnace body is at least 6.7*10<-3> Pa, the temperature of the furnace body is 250-450 DEG C, so that the marked impact on blade matrix material microstructure in the deposition process can be reduced; by using specific arc current, large particles, liquid drop and cavity on the coating surface in the deposition process can be reduced, so that the coating surface is smooth, compact, and uniform, and the corrosion resistance is improved.

Description

technical field [0001] The invention relates to the technical field of coating materials, in particular to an anti-pitting coating on the surface of a blade and a preparation method thereof. Background technique [0002] Turbine blades are the key components of gas turbine engines and the most direct components that convert thermal energy into mechanical energy. During the working process of the engine, the working environment of the turbine blades is very harsh, not only to bear the combined effect of high temperature, high pressure, high-speed airflow impact, huge centrifugal load and vibration load, but also to be corroded by high-temperature gas. In particular, the anti-pitting performance will decrease rapidly, which will greatly reduce the life of the turbine blades, so it is very important to strive to improve the anti-pitting performance of advanced steam turbine blades. [0003] Ion-plated TiN coating has become the most commonly used coating material for cemented ...

Claims

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Application Information

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IPC IPC(8): C23C14/06C23C14/34F01D5/28
Inventor 张程煜折洁乔生儒韩栋李玫
Owner NORTHWESTERN POLYTECHNICAL UNIV
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