Method for preparing erosion resistive and high-temperature abradable seal coating based on hot spraying

A sealing coating, erosion-resistant technology, applied in the direction of coating, metal material coating process, fusion spraying, etc., can solve the problem of unable to meet the requirements of engine use, to eliminate the phase change affecting the life or performance of the coating Even failure, superior erosion resistance, significant erosion resistance effect

Inactive Publication Date: 2013-05-15
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the working temperature of the compressor has reached above 1000°C. Since most of the previous coatings were used at a temperature lower than 850°C, it is obvious that they cannot meet the requireme

Method used

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  • Method for preparing erosion resistive and high-temperature abradable seal coating based on hot spraying
  • Method for preparing erosion resistive and high-temperature abradable seal coating based on hot spraying
  • Method for preparing erosion resistive and high-temperature abradable seal coating based on hot spraying

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Al by flame spraying 2 o 3 Take powder as an example, part of the powder is hollow, and the particle size of the powder is 40~50μm, such as figure 1 shown. The flame gun is operated by the manipulator, and the speed of the gun is 30mm / s. Spraying uses oxygen for powder feeding, the flow rate of acetylene is 300L / h, the spraying distance is 20mm, the flame is a micro-oxidizing flame, and the flow rate of compressed air is 1500L / h. Will Al 2 o 3 The substrate sheet (compressed and sintered by spraying powder) was preheated to 1200°C for spraying, and the temperature in front of the substrate was monitored with an infrared thermometer (RAYRPM30L3U, Raytek, USA). The obtained surface and cross-sectional morphology are as figure 2 As shown, the formation of α-Al 2 o 3 This stable phase structure.

Embodiment 2

[0045] Al by flame spraying 2 o 3 Take powder as an example, part of the powder is hollow, and the particle size of the powder is 40~50μm, such as figure 1 shown. The flame gun is operated by the manipulator, and the speed of the gun is 30mm / s. Spraying uses oxygen for powder feeding, acetylene flow rate is 200L / h, 300L / h, 400L / h respectively, spraying distance is 40mm, flame is micro-oxidation flame, and compressed air flow rate is 1500L / h. The cross-sectional shape is as image 3 shown. It can be seen from the figure that with the increase of the acetylene flow rate, the open pores of the coating gradually decrease, and the closed pores that meet the requirements increase, and with the increase of the flow rate, the size of the closed pores decreases. It can be seen that by adjusting the flow rate of acetylene, a sealing coating with good performance required by the required porosity can be obtained.

Embodiment 3

[0047] Al by flame spraying 2 o 3 Take powder as an example, part of the powder is hollow, and the particle size of the powder is 40~50μm, such as figure 1 shown. The flame gun is operated by the manipulator, and the speed of the gun is 30mm / s. Spraying uses oxygen for powder feeding, the acetylene flow rate is 400L / h, the spraying distance is 20mm, 30mm, 40mm, 60mm respectively, the flame is a micro-oxidation flame, and the compressed air flow rate is 1500L / h. The obtained surface morphology and cross-sectional morphology are as follows Figure 4 shown. Figure 4 (g) with Figure 4 The coating particles shown in (h) are completely melted, the coating has low porosity and is too dense, which does not meet the actual requirements of the sealing coating. It can be seen from the figure that the sealing coatings with different surface morphology and internal porosity can be obtained by adjusting the spraying distance. If the deposition surface temperature is controlled abov...

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Abstract

The invention discloses a method for preparing an erosion resistive and high-temperature abradable seal coating based on hot spraying. The method comprises the following steps: liquid-solid two-phase particles with molten surfaces are collided and deposited on the surface of a substrate; the temperature of the surface of the substrate is controlled in order to form a phase structure with high hot stability when the liquid states of the liquid-solid two-phase particles are partially condensed; the surface of the substrate is effectively combined with the solid-phase particle in the liquid-solid two-phase particles; the follow-up liquid-solid two-phase particles are deposited on the surfaces of the deposited particles and gradually accumulated to form a depositional layer with a pore structure; and the filling powder with the particle size less than that of the pore structure of the depositional layer or the precursor of the filling powder is filled into communication pores in the depositional layer in form of solid phase or suspension liquid, thus obtaining the erosion resistive and high-temperature abradable seal coating. The seal coating prepared by the method disclosed by the invention is wide in selective scope, holes are uniformly distributed in a coating, the cost is lower, and the method is simple and convenient.

Description

technical field [0001] The invention belongs to the technical field of sealing coating preparation, and relates to a method for preparing an erosion-resistant, high-temperature, wearable sealing coating based on thermal spraying. Background technique [0002] With the continuous development and progress of the aerospace industry, reducing the gap between moving and static parts has become one of the important means to obtain high thrust, high efficiency and low fuel consumption when designing and manufacturing high-performance engines. However, in the use of blades, thermal deformation and vibration will cause the overall displacement of the parts, the high-speed rotation of the engine rotor will cause the blades to elongate, and certain tolerances and assembly deviations must be reserved during the processing of parts. Leave some space. Therefore, the simple and effective method of sealing coating must be used to reduce the gap. [0003] Foreign research on abradable seal...

Claims

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Application Information

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IPC IPC(8): C23C4/12C23C4/10C23C4/073C23C4/11C23C4/129
Inventor 李长久杨冠军李成新
Owner XI AN JIAOTONG UNIV
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