CN1045635C - Cermet coating preventing liquid sludge-removing furnace from iron-separating corrosion - Google Patents
Cermet coating preventing liquid sludge-removing furnace from iron-separating corrosion Download PDFInfo
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- CN1045635C CN1045635C CN96118693A CN96118693A CN1045635C CN 1045635 C CN1045635 C CN 1045635C CN 96118693 A CN96118693 A CN 96118693A CN 96118693 A CN96118693 A CN 96118693A CN 1045635 C CN1045635 C CN 1045635C
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- layer
- iron
- coating
- boiler
- nicraly
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Abstract
The present invention relates to a metallic ceramic coating for preventing liquid slag discharging boilers from being eroded by separated iron, which comprises a bottom layer formed by NiCrAlY alloy, wherein a two-layer transition layer is arranged on the bottom layer. One layer of the two layers contains 60% of NiCrAlY alloy and 40% of ZrO2 ceramic. A surface work layer containing 20% of NiCrAlY and 80% of ZrO2 ceramic is arranged on the transition layer. The metallic ceramic coating is sprayed on the surface of a boiler pipe of a slag discharging mouth of a liquid slag discharging boiler to form a coating which can effectively isolate liquid separated iron from the steel pipe of the boiler and prevent the steel pipe from being eroded by the separated iron. Thereby, the problem of tube burst caused by separated iron of liquid slag discharging boilers is solved.
Description
The present invention relates to a kind of metal-ceramic coating, particularly a kind of plasma spraying metal-ceramic coating of defending the slag tapping boiler iron-separating corrosion.
Analyse iron and be the very high pig iron of a kind of foreign matter content that the slag tap D-type boilerD separates out in the slag by furnace bottom in operational process (sulphur: 6～9%, phosphorus: 4～6%), its fusing point is about 1100～1400 ℃.Fused is analysed the iron cinder notch tube-surface of in a single day flowing through, and boiler tube " is scratched " in very fast meeting, causes pipe explosion accident, forces whole boiler to shut down repairing.Have a strong impact on power plant safety, stable electric generation, and caused the tremendous economic loss.
Zirconia ceramics (ZrO
2) fusing point up to 2900 ℃, and have very high stability at elevated temperature and a low thermal conductivity, successfully be applied at present the surface of some key components and partss in Aeronautics and Astronautics and iron and steel and the automotive industry, play well heat insulation, anticorrosion and wear-resisting effect as thermal barrier coating.But because ceramic coating itself is more crisp, differing of coefficient of thermal expansion and metallic matrix is bigger, in spraying process and in on-the-spot the military service under the operating mode of rapid heat cycle, is easy to generate and ftractures and peel off.In addition, zirconia ceramics can produce the phase transformation of monoclinic form → cubic about 1000～1200 ℃, and the volume effect of phase transformation also can cause coating cracking.For development and application zirconia ceramics coating better, in recent years, Zirconium oxide heat barrier coating has been made number of research projects both at home and abroad.The result proves, adopts 8%～20% Y
2O
3Oxide compound is to ZrO
2Ceramic coating carries out the Y-ZrO that " semi-stabilityization " toughness reinforcing processing obtains
2The thermostability of coating is best." semi-stabilityization " guaranteed to exist in the coating part tiny crack and certain porosity (about 8%～12%), and these are all favourable to reducing the coating internal stress and improving the thermal boundary performance.But for gas phase or liquid phase corrosive atmosphere, corrosive medium might infiltrate matrix by these holes, therefore for anticorrosion be disadvantageous.
The objective of the invention is to develop a kind of cermet composite coating, it is sprayed at slag tapping boiler slag-drip opening boiler tube surface, forming one deck can effectively isolate liquid state about 1400 ℃ and analyse iron and directly act on the seamless steel tube for boiler surface, the corrode of iron to steel pipe analysed in the defence fusion, thereby solves the iron booster problem of analysing of slag tapping boiler.
Fail fine solution slag tapping boiler according to power plant in the past and analyse the experience and lessons of iron problem, the contriver is at first by simulation test and theoretical analysis, proof analyse iron to the mechanism of action of boi1er tube be because analyse high-sulfur in the iron, phosphorus impurities reduces boiler tube surface fusing point, cause that iron atom continually from the analyse mass transfer process that fusant spread of tube surfaces to the surface of flowing through, academicly is called corrode.In order to resist corrode, have only and adopt the ceramic based material that has stable high-temperature performance as protective coating.
The present invention includes the tack coat (bottom) between pottery and the metallic matrix, configuration is two-layer on the tack coat is intended to improve the do not match tie coat of situation of pottery and thermal expansion metal coefficient, configuration surface working lining on the transition layer.
Tack coat is by the NiCrAlY alloy composition, and wherein Cr content is 18～20%, aluminium content 5～6%, Y
2O
3Content is about 2%, and all the other are Ni.Coat-thickness 0.09～0.12mm.
Transition layer is made up of two-layer, and the one deck near tack coat contains 60% NiCrAlY alloy and 40%ZrO
2Pottery.Wherein the NiCrAlY alloy ingredient is the same with the tack coat composition.Near one deck of work layer on surface, its NiCrAlY alloy content (composition is the same) is 20%, ZrO
2Ceramic content is 80%, and two layers of thickness is 0.20～0.25mm.
Work layer on surface all is ZrO
2Ceramic coating, thickness are 0.25～0.30mm,
Above ZrO
2Ceramic coating 8-12%Y
2O
3As the coating stablizer.
Technological process of the present invention is as follows:
At first select for use 20 orders～40 purpose silicon carbide that metallic matrix is carried out sandblast, remove surface oxide layer and pollutent, make surfaceness reach 15～25 μ m, spray the NiCrAlY tack coat then, then spray transition layer, spray working lining at last.
Embodiment:
Spraying equipment adopts 9M system of U.S. METCO company high energy plasma spraying machine.Plasma gun selects the 9MB bi-functional spray gun, and 4MP twin-bucket automatic powder feeding device is selected in powder feeding for use, and spraying parameter is following, and (plasma gas is Ar-H
2);
| Coating | Electric current (A) | Voltage (V) |
| Tack coat | 480～490 | 65～68 |
| Transition layer | 495～505 | 68～72 |
| Work layer on surface | 510～530 | 73～75 |
The metal-ceramic coating of the present invention's preparation carries out the simulation comparison test in the laboratory, its anti-iron-separating corrosion performance is better than the 20G seamless steel tube for boiler more than 20 times.Coating is quenched after 800 ℃ of heating and is pined for hitting test in 20 ℃ the water, cracking occurs 30 times and peels off.
Adopt this coating formula and technology, coating cinder notch pipe for power plant's preparation, be installed on slag tapping boiler through operation in 2 years, analysing in a large number under the excessive situation of iron, iron-separating corrosion takes place, breaks (according to power plant's 92 year statistics in none, former not band coating cinder notch pipe every year is because of iron-separating corrosion booster average out to more than 6 times), the on-site assessment result is good.
This coat system also is applicable to the resistance to high temperature corrosion and the wearing and tearing of equipment component under the similar operating modes of large-lot producer such as iron and steel, petrochemical complex.
Claims (1)
1. defend the metal-ceramic coating of slag tapping boiler iron-separating corrosion, comprise the bottom bonding with metallic matrix, dispose transition layer on the bottom, dispose work layer on surface on the transition layer, it is characterized in that said bottom is by the NiCrALY alloy composition, underlayer thickness is 0.09～0.12mm, said transition layer is made up of two-layer, contains 60% NiCrALY alloy and 40% ZrO near one deck of bottom
2Pottery contains 20% NiCrALY and 80% ZrO near one deck of work layer on surface
2Pottery, the thickness of two transition layers is 0.20～0.25mm, and said work layer on surface all is ZrO
2Ceramic coating, in the said NiCrAlY alloy, Cr content is 18～20%, aluminium content is 5～6%, Y
2O
3Content is 2%, and all the other are Ni, said ZrO
2Ceramic coating contains 18～20% Y
2O
3, above-mentioned each components contents is weight percentage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96118693A CN1045635C (en) | 1996-06-06 | 1996-06-06 | Cermet coating preventing liquid sludge-removing furnace from iron-separating corrosion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96118693A CN1045635C (en) | 1996-06-06 | 1996-06-06 | Cermet coating preventing liquid sludge-removing furnace from iron-separating corrosion |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1147563A CN1147563A (en) | 1997-04-16 |
| CN1045635C true CN1045635C (en) | 1999-10-13 |
Family
ID=5125261
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN96118693A Expired - Fee Related CN1045635C (en) | 1996-06-06 | 1996-06-06 | Cermet coating preventing liquid sludge-removing furnace from iron-separating corrosion |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1045635C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110003165A1 (en) * | 2007-12-04 | 2011-01-06 | Sulzer Metco (Us) Inc. | Multi-layer anti-corrosive coating |
| US8697251B2 (en) | 2010-01-20 | 2014-04-15 | United States Pipe And Foundry Company, Llc | Protective coating for metal surfaces |
| CN102352477A (en) * | 2011-10-19 | 2012-02-15 | 西安建筑科技大学 | Method for performing supersonic atmospheric plasma spraying of zirconium oxide on surface of crystallizer copper plate |
| CN104775087B (en) * | 2014-12-05 | 2017-08-25 | 襄阳航泰动力机器厂 | A kind of preparation method of metal composite ceramal thermal barrier coating |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61250161A (en) * | 1985-04-30 | 1986-11-07 | Riken Corp | Cylinder liner |
| JPS635349A (en) * | 1986-06-25 | 1988-01-11 | Konica Corp | Photosensitive body |
| CN1047113A (en) * | 1989-05-08 | 1990-11-21 | 上海钢铁工艺技术研究所 | Method for surface reinforced treatment of metal part |
| CN1019094B (en) * | 1989-06-15 | 1992-11-18 | 中国石油化工总公司兰州炼油化工总厂 | Method for preparing high-silicon Y zeolite |
| CN1087956A (en) * | 1992-12-05 | 1994-06-15 | 吉开俊 | Disposable metallic and ceramic compound spraying powder |
| JPH0827581A (en) * | 1994-07-19 | 1996-01-30 | Mitsubishi Heavy Ind Ltd | Ceramic coating method |
| CN1122376A (en) * | 1994-06-24 | 1996-05-15 | 普拉塞尔·S·T·技术有限公司 | A process for producing an oxide dispersed mcraly-based coating |
-
1996
- 1996-06-06 CN CN96118693A patent/CN1045635C/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61250161A (en) * | 1985-04-30 | 1986-11-07 | Riken Corp | Cylinder liner |
| JPS635349A (en) * | 1986-06-25 | 1988-01-11 | Konica Corp | Photosensitive body |
| CN1047113A (en) * | 1989-05-08 | 1990-11-21 | 上海钢铁工艺技术研究所 | Method for surface reinforced treatment of metal part |
| CN1019094B (en) * | 1989-06-15 | 1992-11-18 | 中国石油化工总公司兰州炼油化工总厂 | Method for preparing high-silicon Y zeolite |
| CN1087956A (en) * | 1992-12-05 | 1994-06-15 | 吉开俊 | Disposable metallic and ceramic compound spraying powder |
| CN1122376A (en) * | 1994-06-24 | 1996-05-15 | 普拉塞尔·S·T·技术有限公司 | A process for producing an oxide dispersed mcraly-based coating |
| JPH0827581A (en) * | 1994-07-19 | 1996-01-30 | Mitsubishi Heavy Ind Ltd | Ceramic coating method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1147563A (en) | 1997-04-16 |
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