Preparation method of NiCr/Al2O3 composite coating

A composite coating and composite powder technology, applied in the coating, metal material coating process, melt spraying and other directions, can solve the problems of high cost, complex process, thick coating, etc., to increase corrosion resistance, bonding strength High, the effect of overcoming the loss of corrosion resistance

Active Publication Date: 2018-08-03
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The structure of the coating obtained by this method is dense, but the process is complicated. It is too expensive to obtain a thicker coating, and the cost is high, so it is not suitable for preparing a thicker coating.

Method used

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  • Preparation method of NiCr/Al2O3 composite coating
  • Preparation method of NiCr/Al2O3 composite coating
  • Preparation method of NiCr/Al2O3 composite coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Step 1: Formulating NiCr / Al for Plasma Spraying 2 o 3 compound powder;

[0040] NiCr20 powder with a particle size range of 5 microns to 15 microns, Al with a particle size range of 0.07 microns to 1 micron 2 o 3 Mix the powder evenly into a powder mixture. Wherein, NiCr20 alloy powder accounts for 10% by weight of the total mass of raw material powder, Al 2 o 3 Powder accounted for 90% by weight of the total mass of raw material powder, NiCr20 and Al 2 o 3 The weight ratio between them is 10:90, and then evenly mixed into the binder with a weight ratio of powder: polyvinyl alcohol = 100:1, ultrasonically vibrated for 20 minutes, and then stirred by mechanical mixing for 90 minutes, thus preparing into NiCr / Al for plasma spraying 2 o 3 compound powder;

[0041] The second step, metal matrix material pretreatment:

[0042] Sandblasting is carried out on the surface of 45# steel to be coated, and then the NiAl bottom layer is sprayed on the surface of the metal...

Embodiment 2

[0046] Step 1: Formulating NiCr / Al for Plasma Spraying 2 o 3 compound powder;

[0047] NiCr20 powder with a particle size range of 5 microns to 15 microns, Al with a particle size range of 0.07 microns to 1 micron 2 o 3 Mix the powder evenly into a powder mixture. Wherein, NiCr20 alloy powder accounts for 15% by weight of the total mass of raw material powder, Al 2 o 3 Powder accounted for 85% by weight of the total mass of raw material powder, NiCr20 and Al 2 o 3 The weight ratio between them is 15:85, and then evenly mixed into the binder with a weight ratio of powder: polyvinyl alcohol = 100:1, ultrasonically vibrated for 20 minutes, and then stirred by mechanical mixing for 90 minutes, thus preparing into NiCr / Al for plasma spraying 2 o 3 compound powder;

[0048] The second step, metal matrix material pretreatment:

[0049] Sand blast the surface of 45# steel to be coated, and then spray the NiAl bottom layer on the surface of the metal base material after sand...

Embodiment 3

[0057] Step 1: Formulating NiCr / Al for Plasma Spraying 2 o 3 compound powder;

[0058] NiCr20 powder with a particle size range of 5 microns to 15 microns, Al with a particle size range of 0.07 microns to 1 micron 2 o 3 Mix the powder evenly into a powder mixture. Wherein, NiCr20 alloy powder accounts for 15% by weight of the total mass of raw material powder, Al 2 o 3 Powder accounted for 85% by weight of the total mass of raw material powder, NiCr20 and Al 2 o 3 The weight ratio between them is 15:85, and then evenly mixed into the binder with a weight ratio of powder: polyvinyl alcohol = 100:1, ultrasonically vibrated for 20 minutes, and then stirred by mechanical mixing for 90 minutes, thus preparing into NiCr / Al for plasma spraying 2 o 3 compound powder;

[0059] The second step, metal matrix material pretreatment:

[0060] Sand blast the surface of 45# steel to be coated, and then spray the NiAl bottom layer on the surface of the metal base material after sand...

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Abstract

The invention discloses a preparation method of a NiCr / Al2O3 composite coating. The preparation method comprises the steps of firstly, mechanically mixing Ni-Cr alloy powder with Al2O3 powder, and conducting ultrasonic oscillation, so that NiCr / Al2O3 composite powder is obtained; and then, conducting plasma spraying, so that the NiCr / Al2O3 composite coating with the NiCr content ranging from 10% to 30% is synthesized. By means of the preparation method, bonding strength of an Al2O3 coating is improved, and the defect that corrosion resistance of an aluminum oxide coating is lost in a strong acid environment is overcome.

Description

technical field [0001] Technical scheme of the present invention relates to using NiCr / Al 2 o 3 Plating of metallic materials, specifically NiCr / Al 2 o 3 Preparation method of composite coating. Background technique [0002] The wear and corrosion of metal materials are issues that cannot be ignored in the field of material science and engineering today. Research on the failure of metal materials caused by wear and corrosion shows that most of these failures occur on the surface of the material, which seriously affects the service life of the material. Therefore, improving the wear resistance and corrosion resistance of metal materials is mainly to improve the surface properties of metal materials. al 2 o 3 Ceramic coating has the performance characteristics of wear resistance, corrosion resistance and high temperature oxidation resistance, and is widely used in aerospace, mechanization, chemical industry, iron and steel metallurgy and other fields. However, its corr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/134C23C4/11C23C4/08C23C4/02
CPCC23C4/02C23C4/08C23C4/11C23C4/134
Inventor 董天顺王冉李国禄底月兰刘利
Owner HEBEI UNIV OF TECH
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