CN1257134A - Anti-impringement protective layer for tuyere of blast furnace and making method thereof - Google Patents
Anti-impringement protective layer for tuyere of blast furnace and making method thereof Download PDFInfo
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- CN1257134A CN1257134A CN98123337A CN98123337A CN1257134A CN 1257134 A CN1257134 A CN 1257134A CN 98123337 A CN98123337 A CN 98123337A CN 98123337 A CN98123337 A CN 98123337A CN 1257134 A CN1257134 A CN 1257134A
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Abstract
The present invention relates to an erosion-resisting protective layer for blast tuyere of blast furnace and its production method. Said protective layer material is made up by using MCrAl system alloy powder (M is Ni, Co or Ni + Co) and ceramic powder as raw material, in which MCrAl alloy is used as matrix metal, and the hard ceramic powder is used as reinforcing phase, and dispersively distributed in the matrix metal so as to form typical metal ceramic strucure, the ceramic phase is 10-95%, can be one kind of Cr3C2 and CrB2 or mixture of them. Its production method includes the following steps: machining thin wall internal lining whose size and form are identical to inner wall of blast tuyere, spraying matrix metal layer and metal ceramic coating on both faces of the lining, hot-treating the sprayed lining and in laying the eresion-resisting protective layen onto the inner wall of blast tuyere so as to implement said invention.
Description
The present invention is relevant with blast-furnace tuyere.
Blast-furnace tuyere is the necessary important technological equipment of ironmaking air-supply, and can its life-span length directly have influence on blast furnace and keep direct motion and reduce ironmaking cost.Along with the continuous increase of coal powder injection ratio, the blast-furnace tuyere inwall often washes away because of the high speed of coal dust and causes erosion attack.
Day disclosure special permission communique discloses a kind of method and coating formula that is used to protect at blast-furnace tuyere wall hot spray coating for clear 53-138905 number, adopts heat spraying method to add Al spraying Ni base self-fluxing alloy layer, Co-Ni-Mo-W-Si or Co-Ni alloy successively at the blast-furnace tuyere wall
2O
3-ZrO
2Metal-ceramic coating, Al
2O
3-ZrO
2Ceramic topcoats.Protective coating for inwall, because there is the stress that causes because of contraction in coating in spraying process, inside coating is very easy to be peeled off from matrix, so the very difficult 0.5mm that surpasses of the coat-thickness of inwall, and the anti-impact of coating erosion protection effect is restricted under the air port long term operation condition.
The enforcement period of the ninth five-year plan, China's iron and steel metallurgical industry, for reducing ironmaking cost, just wideling popularize furnace coal spraying technology, coal powder injection will progressively be brought up to 150Kg/tFe than also, and a large amount of coal injection, more serious to the erosion attack that the air port inwall causes, therefore be badly in need of developing a kind of service-strong anti-impringement protective layer under the normal running conditions of air port that satisfies, for overcoming the limitation of prior art, special proposition the present invention.
The present invention proposes anti-impringement protective layer for tuyere of blast furnace material and manufacture method thereof, the anti-impringement protective layer material is that (M refers to Ni by the MCrAl series alloy powder, Co or Ni+Co) and ceramic powder be raw material, wherein MCrAl is that (M refers to Ni to alloy, Co or Ni+Co) as matrix metal, its composition is (weight %): Cr8-40, Al3-20, surplus is Ni or Co, hard ceramic particles is formed as wild phase, and the ceramic phase disperse is distributed in the matrix metal, constitutes typical sintering metal structure, the shared volume percent of ceramic phase is in the 10-95% scope, and ceramic powder is Cr
3C
2, CrB
2In one or both mixture.Blast-furnace tuyere inwall anti-impringement protective layer is to make like this, at first machining and air port inwall size, the thin-walled technology inner tube of a tyre that shape is similar, then at the cylindrical wall thermospray bond coating of the inner tube of a tyre, cermet coating constitutes anti-impringement protective layer with being connected to the air port inwall after the prefabricated component thermal treatment after the spraying.
(M refers to Ni to MCrAl in the protection coating materials prescription that the present invention proposes, Co or Ni+Co) be to realize one of base substance of the present invention, further improve the anti-oxidant of this series alloy, hot corrosion resistance can be to wherein adding Y, Ta, Si, elements such as Hf, typical alloying constituent is as follows: Ni17Cr6Al0.4Y, Ni22Cr10Al1.0Y, Ni25Cr6Al0.4Y, Ni31Cr11Al0.6Y, Ni23Co20Cr8.5Al4Ta0.6Y etc. suitably adjust Cr wherein, Al, Co, Ta, the content of elements such as Y is without prejudice to aim of the present invention.The granularity of MCrAl series alloy powder is-80 orders.Ceramic powder is Cr
3C
2, CrB
2In one or both mixture, its granularity is-140 orders, for the flowability that improves dusty spray with the oxidation when reducing the ceramic powder thermospray, can carry out Electroless Plating Ni or the Co rete is handled to ceramic powder.Earlier metal-powder and ceramic powder are mixed before the thermospray.
In the manufacture method that the present invention proposes, hot-spraying techniques refers to plasma spray coating process or hypersonic flame spraying technology.Bond coating adopts Ni/Al or NiCr/Al composite powder or MCrAlY powder spraying, and underlayer thickness is 0.08-0.25mm; Metal-ceramic coating thickness is 0.6-2.5mm, after the spray prefabricated component is put into High Temperature Furnaces Heating Apparatus and heat-treats, and standard is: 400-1150 ℃ is incubated 0.5-12 hour, to reduce the unrelieved stress of coating.Prefabricated component is connected to the air port inwall and adopts heat edge technology to finish.
Adopting prescription of the present invention and manufacture method to form blast-furnace tuyere inwall anti-impringement protective layer has the following advantages:
1. same material, forming coating in the outer wall thermospray can be than obtain bigger thickness at inwall, therefore behind technology inner tube of a tyre outer wall hot spray coating, prefabricated component heat edge to air port inwall can be formed thicker anti-impringement protective layer, enough anti-impact erosion protection effects are arranged under air port long term operation condition;
2. the metal and the stupalith that adopt of the present invention has approaching thermal expansivity, and the sintering metal thermal shock resistance is better, and the coating internal stress is less, and under thermal stresses and mechanical stress influence, coating cracking, the possibility of falling piece reduce.
Embodiment: at soft steel inner tube of a tyre cylindrical wall plasma spraying nickel alclad bond coating at first, its composition is Ni90Al10, and powder size is-the 140+325 order that coat-thickness is 0.1-0.2mm; Plasma spraying Ni25Cr6Al0.4Y and Cr then
3C
2Metal ceramic powder after the mechanically mixing, Cr in the mixed powder
3C
2Account for 50wt.%, its granularity is-the 200+400 order that the Ni25Cr6Al0.4Y powder size is-the 140+400 order that adopting Ar during plasma spraying is main gas, H
2Be assist gas, powder feeding gas is an Ar gas, and metal-ceramic coating thickness is 2.0mm.After the spraying with prefabricated component in common high-temperature electric resistance furnace in 950 ± 20 ℃ of thermal treatments 4 hours.When prefabricated component heat was inlayed the air port inwall, the air port preheating temperature was 600-800 ℃.
Claims (9)
1. anti-impringement protective layer for tuyere of blast furnace and manufacture method thereof, protection coating materials is that (M refers to Ni by the MCrAl series alloy powder, Co or Ni+Co) and ceramic powder be raw material, wherein the MCrAl alloy is as matrix metal, hard ceramic particles is formed as wild phase, and the ceramic phase disperse is distributed in the matrix metal, constitutes typical sintering metal structure, the shared volume percent of ceramic phase is in the 10-95% scope, and ceramic powder is Cr
3C
2, CrB
2In one or both mixture; Blast-furnace tuyere inwall anti-impringement protective layer is to make like this, at first machining and air port inwall size, the similar thin-walled technology inner tube of a tyre of shape, at the cylindrical wall thermospray bond coating and the metal-ceramic coating of the inner tube of a tyre, the prefabricated component thermal treatment after heat after will spraying is at last inlayed the air port inwall and is constituted anti-impringement protective layer then.
2. MCrAl according to claim 1 is an alloy, it is characterized in that this alloy is that NiCrAl is an alloy, and its composition is (weight %): Cr8-40, Al3-20, surplus is Ni, is high-temperature oxidation resistant and the hot corrosion resistance that improves this alloy, to wherein adding a spot of Y, Si, Ta, Co alloying element are without prejudice to aim of the present invention, and typical alloying constituent is as follows: Ni17Cr6Al0.4Y, Ni22Cr10Al1.0Y, Ni25Cr6Al0.4Y, Ni31Cr11Al0.6Y, Ni23Co20Cr8.5Al4Ta0.6Y etc., suitably adjust Cr wherein, Al, Co, Ta, the content of elements such as Y is without prejudice to aim of the present invention, and the granularity of MCrAl series alloy powder is-140 orders.
3. metal-ceramic coating according to claim 1 is characterized in that coating is by MCrAl series alloy powder and Cr
3C
2Ceramic powder mixes the back and adopts hot-spraying techniques to form, and the ceramic powder granularity is-140 orders.。
4. metal-ceramic coating according to claim 1 is characterized in that coating is by MCrAl series alloy powder and CrB
2Ceramic powder mixes the back and adopts hot-spraying techniques to form, and the ceramic powder granularity is-140 orders.
5. prefabricated component thermal treatment according to claim 1 is characterized in that thermal treatment temp is 400-1150 ℃, and soaking time is 0.5-12 hour.
6. ceramic powder according to claim 3 is characterized in that Cr
3C
2Ceramic powder adopts Electroless Plating Ni to handle.
7. ceramic powder according to claim 3 is characterized in that CrB
2Ceramic powder adopts Electroless Plating Ni to handle.
8. hot-spraying techniques according to claim 3 is characterized in that thermospray refers to plasma spraying.
9. hot-spraying techniques according to claim 3 is characterized in that thermospray refers to hypersonic flame spraying.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN98123337A CN1257134A (en) | 1998-12-14 | 1998-12-14 | Anti-impringement protective layer for tuyere of blast furnace and making method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN98123337A CN1257134A (en) | 1998-12-14 | 1998-12-14 | Anti-impringement protective layer for tuyere of blast furnace and making method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1257134A true CN1257134A (en) | 2000-06-21 |
Family
ID=5228154
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN98123337A Pending CN1257134A (en) | 1998-12-14 | 1998-12-14 | Anti-impringement protective layer for tuyere of blast furnace and making method thereof |
Country Status (1)
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|---|---|
| CN (1) | CN1257134A (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1789433B (en) * | 2004-12-16 | 2010-04-07 | 鞍钢股份有限公司 | Long-life energy-saving blast furnace tuyere and manufacturing method thereof |
| CN101492749B (en) * | 2008-01-24 | 2010-09-08 | 宝山钢铁股份有限公司 | Surface coating for tuyeres of blast furnace and method for preparing the same |
| CN101952481B (en) * | 2008-02-11 | 2013-10-16 | 通用电气公司 | Anti fouling coatings for components exposed to slag, ash and/or char |
| CN106282895A (en) * | 2016-11-17 | 2017-01-04 | 无锡明盛纺织机械有限公司 | A kind of flow passage component of slurry pump surface air plasma spraying repair technology |
| CN106282897A (en) * | 2016-11-17 | 2017-01-04 | 无锡明盛纺织机械有限公司 | A kind of flow passage component of slurry pump surface plasma spraying repair technology |
| CN107236331A (en) * | 2017-06-16 | 2017-10-10 | 国电科学技术研究院武汉电力技术分院 | High-temperature corrosion resistance coating and preparation method thereof and high-temperature corrosion resistance coating and preparation method thereof |
| CN107419213A (en) * | 2017-07-27 | 2017-12-01 | 广东电网有限责任公司电力科学研究院 | A kind of surface anticorrosion method of metallic matrix |
| CN109868444A (en) * | 2019-04-09 | 2019-06-11 | 安徽工业大学 | A kind of high nichrome based ceramic metal protective coating, preparation method and application |
| CN111363966A (en) * | 2020-04-09 | 2020-07-03 | 莆田学院 | Zinc liquid corrosion wear resistant high-boron alloy material and preparation method thereof |
| CN112063955A (en) * | 2020-09-15 | 2020-12-11 | 昆明理工大学 | Method for improving high-temperature mechanical property of zirconium alloy surface |
-
1998
- 1998-12-14 CN CN98123337A patent/CN1257134A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1789433B (en) * | 2004-12-16 | 2010-04-07 | 鞍钢股份有限公司 | Long-life energy-saving blast furnace tuyere and manufacturing method thereof |
| CN101492749B (en) * | 2008-01-24 | 2010-09-08 | 宝山钢铁股份有限公司 | Surface coating for tuyeres of blast furnace and method for preparing the same |
| CN101952481B (en) * | 2008-02-11 | 2013-10-16 | 通用电气公司 | Anti fouling coatings for components exposed to slag, ash and/or char |
| CN106282895A (en) * | 2016-11-17 | 2017-01-04 | 无锡明盛纺织机械有限公司 | A kind of flow passage component of slurry pump surface air plasma spraying repair technology |
| CN106282897A (en) * | 2016-11-17 | 2017-01-04 | 无锡明盛纺织机械有限公司 | A kind of flow passage component of slurry pump surface plasma spraying repair technology |
| CN107236331A (en) * | 2017-06-16 | 2017-10-10 | 国电科学技术研究院武汉电力技术分院 | High-temperature corrosion resistance coating and preparation method thereof and high-temperature corrosion resistance coating and preparation method thereof |
| CN107236331B (en) * | 2017-06-16 | 2019-07-16 | 国电科学技术研究院武汉电力技术分院 | High-temperature corrosion resistance coating and preparation method thereof and high-temperature corrosion resistance coating and preparation method thereof |
| CN107419213A (en) * | 2017-07-27 | 2017-12-01 | 广东电网有限责任公司电力科学研究院 | A kind of surface anticorrosion method of metallic matrix |
| CN109868444A (en) * | 2019-04-09 | 2019-06-11 | 安徽工业大学 | A kind of high nichrome based ceramic metal protective coating, preparation method and application |
| CN111363966A (en) * | 2020-04-09 | 2020-07-03 | 莆田学院 | Zinc liquid corrosion wear resistant high-boron alloy material and preparation method thereof |
| CN112063955A (en) * | 2020-09-15 | 2020-12-11 | 昆明理工大学 | Method for improving high-temperature mechanical property of zirconium alloy surface |
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