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BaCrO4-containing wear-resistant self-lubricating composite powder for plasma spray coating as well as preparation method and application of BaCrO4-containing wear-resistant self-lubricating composite powder

A composite powder and plasma technology, applied in coating, fusion spraying, metal material coating technology and other directions, can solve the problems of short life, in-depth mechanism research, low reliability, etc., to improve self-lubricating performance, reduce Small thermal residual stress, improved incompatibility effect

Active Publication Date: 2021-05-25
GUANGDONG INST OF NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Domestic research on brush seals is mainly concentrated in the field of aero-engines. However, due to the immature design of brush seal structures, the lack of in-depth mechanism research, and the lack of research on the matching between brush wire and runway, the technical level of domestic engine brush seals has been reduced. still in its infancy
For the wear-resistant self-lubricating coating on the rotor raceway, there are still problems such as single material system, high price, low reliability and short service life.

Method used

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  • BaCrO4-containing wear-resistant self-lubricating composite powder for plasma spray coating as well as preparation method and application of BaCrO4-containing wear-resistant self-lubricating composite powder
  • BaCrO4-containing wear-resistant self-lubricating composite powder for plasma spray coating as well as preparation method and application of BaCrO4-containing wear-resistant self-lubricating composite powder
  • BaCrO4-containing wear-resistant self-lubricating composite powder for plasma spray coating as well as preparation method and application of BaCrO4-containing wear-resistant self-lubricating composite powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Al in this example 2 o 3 -5wt.%BaCrO 4 The preparation method of composite powder, comprises the following steps:

[0038] S1. BaCrO 4 The nano-agglomerated powder was placed in an oven at 80°C for 4 hours;

[0039] S2. Use a 150-mesh screen to dry BaCrO at an ultrasonic frequency of 1200Hz 4 The nano-agglomerated powder was vibrated and sieved for 2 hours, and then the above-mentioned sieved powder was vibrated and sieved at an ultrasonic frequency of 1200 Hz for 4 hours by using a 300-mesh sieve;

[0040] S3. BaCrO after sieving 4 Powder and Al with particle size 5-22μm 2 o 3 The original powders were mixed at a weight ratio of 5:95, and mixed by drum machine for 12 hours.

[0041] The Al obtained in this example 2 o 3 -5wt.%BaCrO 4 The SEM morphology and XRD patterns of the composite powder are as follows: figure 1 and Figure 4 As shown, the results show that there are dispersed nano BaCrO 4 Particles adsorbed on Al 2 o 3 Particle surface, nano BaCrO...

Embodiment 2

[0043] Cr in this example 2 o 3 -10wt.%BaCrO 4 The preparation method of composite powder, comprises the following steps:

[0044] S1. BaCrO 4 The nano-agglomerated powder was dried in an oven at 120°C for 6 hours.

[0045] S2. Use a 150-mesh screen to dry BaCrO at an ultrasonic frequency of 1200Hz 4 The nano-agglomerated powder was vibrated and sieved for 2 hours, and then the above-mentioned sieved powder was vibrated and sieved at an ultrasonic frequency of 1200 Hz for 4 hours by using a 300-mesh sieve;

[0046] S3. BaCrO after sieving 4 Powder and Cr with particle size 5-30μm 2 o 3 The raw powders were mixed at a weight ratio of 10:90, and mixed mechanically by drum for 24 hours.

[0047] The resulting Cr 2 o 3 -10wt.%BaCrO 4 The SEM morphology and XRD patterns of the composite powder are as follows: figure 2 , Figure 4 As shown, the results show that the nanoagglomerated BaCrO 4 The powder is significantly dispersed, nano-scale BaCrO 4 Particles surrounde...

Embodiment 3

[0049] The ZrO of this embodiment 2 -15wt.%BaCrO 4 The preparation method of composite powder, comprises the following steps:

[0050] S1. BaCrO 4 The nano-agglomerated powder was dried in an oven at 100°C for 5 hours.

[0051] S2. Use a 150-mesh screen to dry BaCrO at an ultrasonic frequency of 1200Hz 4 The nano-agglomerated powder was vibratingly sieved for 2 hours, and then the above-mentioned sieved powder was vibrated and sieved at an ultrasonic frequency of 1200 Hz for 3 hours using a 300-mesh sieve;

[0052] S3. BaCrO after sieving 4 Powder and ZrO with a particle size of 15-45 μm 2 The raw powders were mixed at a weight ratio of 15:85, and mixed mechanically by drum for 18 hours.

[0053] The resulting ZrO 2 -15wt.%BaCrO 4 The SEM morphology and XRD patterns of the composite powder are as follows: image 3 , Figure 4 As shown, the results show that the nanoagglomerated BaCrO 4 The powder is significantly dispersed, nano-scale BaCrO 4 Most of the particles ...

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Abstract

The invention discloses BaCrO4-containing wear-resistant self-lubricating composite powder for plasma spray coating as well as a preparation method and application of the BaCrO4-containing wear-resistant self-lubricating composite powder. The wear-resistant self-lubricating composite powder comprises the following components in percentage by weight: 85-95% of a wear-resistant phase and 5-15% of a lubricating phase, wherein the wear-resistant phase is Al2O3, Cr2O3 or ZrO2, and the lubricating phase is BaCrO4. The wear-resistant self-lubricating composite powder is obtained through screening and mechanical mixing, and can be applied to a brush type sealing rotor runway coating. The brush type sealing rotor runway coating is a double-layer coating which is prepared on the surface of a rotor runway by adopting a plasma spray coating method and comprises a NiAl, NiCr or MCrAlY (M is Ni or Co) intermediate layer and a BaCrO4-containing wear-resistant self-lubricating surface layer. The preparation method of the composite powder and the coating is low in cost, simple and easy to operate, and beneficial to obtaining the brush type sealing runway coating with uniform tissue and good performance.

Description

technical field [0001] The invention relates to the technical field of material surface treatment, in particular to a BaCrO-containing 4 Wear-resistant self-lubricating composite powder and its preparation method and application. Background technique [0002] The brush seal is a contact type high-speed dynamic flexible seal, its leakage is only 20% of the leakage of the traditional grate seal, and has excellent sealing performance. The greater advantage of the brush seal is reflected in the dynamic sealing condition, because the contact surface between the brush seal and the rotor is composed of many small brush filaments, and there is a certain inclination angle between the brush filament and the rotor, so that the brush filament Thanks to the action of countless small springs, it can effectively overcome the problem of permanent increase in the sealing gap between the seal and the rotor caused by directly rubbing against the rotor for a long time. In addition, based on t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/10C23C4/134C23C4/02C04B35/10C04B35/12C04B35/48C04B35/626
CPCC23C4/10C23C4/134C23C4/02C04B35/10C04B35/12C04B35/48C04B35/62605C04B2235/3243C04B2235/3215
Inventor 牛少鹏杨焜王超黄益聪苏威铭张吉阜刘敏戴红亮曾威邓畅光邓春明宋进兵黄科徐丽萍邓子谦张小锋
Owner GUANGDONG INST OF NEW MATERIALS
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