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Oxygen lance nozzle end face high-temperature protection coating and preparation method thereof

A technology of oxygen lance spray head and protective coating, which is applied in coating, metal material coating process, fusion spraying, etc., can solve the problems of large difference, coating peeling and failure, etc., achieve high density, reduce surface temperature, The effect of simple preparation method

Inactive Publication Date: 2021-04-02
NO 59 RES INST OF CHINA ORDNANCE IND +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the average linear expansion coefficient of boron nitride α=4.92×10 -6 / ℃, the average linear expansion coefficient of oxygen-free copper α=17.9×10 -6 / °C, the difference between the two is large, and the coating is likely to cause the coating to fall off and fail during the thermal fatigue damage process of the working thermal cycle

Method used

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  • Oxygen lance nozzle end face high-temperature protection coating and preparation method thereof
  • Oxygen lance nozzle end face high-temperature protection coating and preparation method thereof
  • Oxygen lance nozzle end face high-temperature protection coating and preparation method thereof

Examples

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Effect test

Embodiment 1

[0039] A high-temperature protective coating on the end face of an oxygen lance nozzle, which is composed of a bonding layer and a ceramic anti-sticking layer. ZrO 2 -24MgO layer. Among them, the mass percentages of Ni, Co, Cr, Al and Y in the NiCoCrAlY layer are 28:35:26:10:0.5, ZrO 2In the -24MgO layer, the mass percentage of MgO is 23%, and the rest is ZrO 2 .

[0040] The preparation method for preparing the high-temperature protective (composite) coating on the end face of the converter oxygen lance nozzle provided by this embodiment, the steps are as follows:

[0041] Step 1. Use metallographic sandpaper to polish the end face of the converter oxygen lance nozzle to remove surface oxides and pollutants. Clean the sample ultrasonically with alcohol for 10 minutes and dry it for later use;

[0042] Step 2, the sample needs to be sandblasted before spraying, and the sandblasting particle size is 30 mesh;

[0043] Step 3, the metal bonding layer material NiCoCrAlY is sp...

Embodiment 2

[0069] A high-temperature protective coating on the end face of an oxygen lance nozzle, which is composed of a bonding layer and a ceramic anti-sticking layer. ZrO 2 -24MgO layer. Among them, the mass percentages of Ni, Co, Cr, Al and Y in the NiCoCrAlY layer are 27:34:25:8:0.3, ZrO 2 In the -24MgO layer, the mass percentage of MgO is 15%, and the rest is ZrO 2 .

[0070] The preparation method for preparing the high-temperature protective (composite) coating on the end face of the converter oxygen lance nozzle provided by this embodiment, the steps are as follows:

[0071] Step 1. Use metallographic sandpaper to polish the end face of the converter oxygen lance nozzle to remove surface oxides and pollutants. Clean the sample ultrasonically with alcohol for 12 minutes and dry it for later use;

[0072] Step 2, the sample needs to be sandblasted before spraying, and the sandblasting particle size is 20 mesh;

[0073] Step 3, the metal bonding layer material NiCoCrAlY is sp...

Embodiment 3

[0076] A high-temperature protective coating on the end face of an oxygen lance nozzle, which is composed of a bonding layer and a ceramic anti-sticking layer. ZrO 2 -24MgO layer. Among them, the mass percentages of Ni, Co, Cr, Al and Y in the NiCoCrAlY layer are 29:37:28:12:0.8, ZrO 2 In the -24MgO layer, the mass percentage of MgO is 30%, and the rest is ZrO 2 .

[0077] The preparation method for preparing the high-temperature protective (composite) coating on the end face of the converter oxygen lance nozzle provided by this embodiment, the steps are as follows:

[0078] Step 1. Use metallographic sandpaper to polish the end face of the converter oxygen lance nozzle to remove surface oxides and pollutants. Clean the sample ultrasonically with alcohol for 15 minutes and dry it for later use;

[0079] Step 2, the sample needs to be sandblasted before spraying, and the sandblasting particle size is 20-30 mesh;

[0080] Step 3, the metal bonding layer material NiCoCrAlY i...

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Abstract

The invention discloses an oxygen lance nozzle end face high-temperature protection composite coating and a preparation method thereof. The coating is composed of a bonding layer and a ceramic anti-sticking layer, the bonding layer is a NiCoCrAlY layer sprayed on an oxygen lance nozzle end face base body, and the ceramic anti-sticking layer is a ZrO2-24MgO layer sprayed on the surface of the bonding layer. The preparation method comprises the following steps of grinding and polishing the end surface of an oxygen lance nozzle, conducting ultrasonic cleaning, and conducting drying for later use;conducting sand blasting on the end face of the oxygen lance nozzle, wherein the sand blasting granularity is not larger than 30 meshes; and spraying the NiCoCrAlY layer and the ZrO2-24MgO layer on the end surface of the oxygen lance nozzle by adopting an atmospheric plasma thermal spraying process. According to the preparation method, the oxygen lance nozzle end face high-temperature protection(composite) coating can be successfully constructed through the atmospheric plasma thermal spraying technology, the obtained coating is smooth and flat in surface, high in density and high in bondingstrength with a base body, the service life of the oxygen lance nozzle is remarkably prolonged, and environmental pollution is avoided; and the preparation method of the oxygen lance nozzle end face high-temperature protection (composite) coating is simple, economical and practical, and can be used for industrial production.

Description

technical field [0001] The invention belongs to the technical field of oxygen lance surface modification, and in particular relates to a high-temperature protective composite coating on the end face of an oxygen lance nozzle and a preparation method thereof. Background technique [0002] In the field of iron and steel metallurgy, oxygen lance injection converter steelmaking has become the main iron and steel smelting method. Oxygen lance, as the key equipment for oxygen-injected converter steelmaking, is the main tool for supplying oxygen to the converter. It is generally welded by oxygen lance nozzles and several sections of ordinary 20# steel pipes. The oxygen lance nozzle is mainly made of oxygen-free copper rod through forging and warm extrusion. Under the condition of water cooling and low temperature, this material has good wettability and easy bonding with the liquid steel slag blown and sprayed during the converter smelting process. The oxygen lance nozzle Slag stic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/46C23C4/134C23C4/11C23C4/073
CPCC21C5/4613C23C4/134C23C4/11C23C4/073
Inventor 吴护林解志文向林刘健高旭宁海青陈永君郭锋苏艳高诗情邢志辉刘鹏
Owner NO 59 RES INST OF CHINA ORDNANCE IND
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