CN1224764A - Surface protecting layer for tuyere of blast furnace and its making process - Google Patents
Surface protecting layer for tuyere of blast furnace and its making process Download PDFInfo
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- CN1224764A CN1224764A CN 97121998 CN97121998A CN1224764A CN 1224764 A CN1224764 A CN 1224764A CN 97121998 CN97121998 CN 97121998 CN 97121998 A CN97121998 A CN 97121998A CN 1224764 A CN1224764 A CN 1224764A
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- surface protecting
- sintering
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Abstract
The present invention relates to tuyere of blast furnace. The inner and outer walls of the front end of the tuyere is always damaged by the high-temperature ablation of coal powder, slag iron, etc. Prefabricated ceramit part with high thermal shock and ablation resistance and no crack is first produced through powder metallurgical process including mixing MCrAlY system alloy powder and hard ceramic powder and sintering, and then connected to the tuyere to form firm high-temperature ablation resisting protective layer. The said method can prolong the service life of tuyere of blast furnace by over one time.
Description
The present invention is relevant with blast-furnace tuyere.
Blast-furnace tuyere is the blast furnace ironmaking necessary important technological equipment of blowing, and can its life-span length directly have influence on blast furnace and keep direct motion, obtains high yield and reduce ironmaking cost.The Working environment in air port is very abominable, (temperature of cupola well is just about 2000 ℃ for not only residing envrionment temperature height, the hot blast temperature of sending in the air port is up to 1000～1200 ℃), and the air port outer wall also be subjected to the thermal shocking of liquid slag iron and drop under the wearing and tearing of hot material; Blast furnace to coal injection; the air port inwall often destroys because of washing away of coal dust; often cause the air port to scrap too early, air port atmosphere of living in also often contains corrosive mediums such as S in addition, makes traditional infiltration layer or overlay cladding destroy the provide protection that loses air port Cu matrix because of thermal etching too early.Under the compound action of above factors, each the type high temp anti-impact erosion surface protecting layer real protection effect that makes present blast-furnace tuyere adopt is unsatisfactory.
The method of clear 64-36175 number disclosed a kind of inlet front end inside and outside wall surface build-up welding boronation system wearing layer of day disclosure special permission communique, this method with the mixture of metal-powder (Ni base self-fluxing alloy) and boride ceramic powders surfacing together to surface, air port formation overlay cladding, overlay cladding and mother metal bonding strength that this method forms are higher, be difficult for peeling off, with in the past merely built-up welding Ni base self-fluxing alloy surface protecting layer compare, because the overlay cladding that this method forms contains the hard ceramic phase of comparatively large vol percentage ratio, wearability can make moderate progress.But owing to have welding stress in the weld deposit process, overlay cladding is difficult to avoid welding crack, the resistance to high temperature oxidation and the hot corrosion resistance of the base of the Ni in overlay cladding self-fluxing alloy are not good in addition, in the use very soon hot-short phenomenon can appear, its reason is that S easily forms low melting point fragility NiS-Ni cocrystalization compound at Ni base self-fluxing alloy crystal boundary, when work cold cycling and the thermal shocking of high temperature sludge iron under, the upper layer inefficacy of easily chapping, even the piece phenomenon occurs falling.
Shoudu Iron and Steel Co was once tested the scheme of the ceramic embedded lining of air port inwall, and this lining is Si
3N
4, ceramic post sintering such as SiC makes, inlay the air port inwall then, in actual the use ceramic chamber lining very easy to crack, fall piece, peel off, major cause is that the temperature field is inhomogeneous in the air port, there is thermal stresses in the ceramic chamber lining, add that stupalith is more crisp, the ability of opposing crack propagation is relatively poor, therefore is prone to big and dangerous crackle, under coal dust washes away additive effect, crackle is easily expansion also, produces piece, and in fact ceramic chamber lining is unsatisfactory at high temperature occasion anti-erosion property; Pottery be difficult to form metallurgical binding with the Cu air port in addition, and the two bonding strength is lower, adds that the two coefficient of expansion differs bigger, and lining easily peels off during cold cycling like this.
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, and a large amount of coal injections, more serious to the erosion attack that cause in the air port, therefore be badly in need of developing a kind of reliable surface protecting layer that satisfies under the normal running conditions of air port, this surface protecting layer should have higher high-temperature oxidation resistant, corrosion and heat resistant, anti-thermal shock, anti-impact erosion, antistrip performance.In order to overcome the above-mentioned defective of prior art, special proposition the present invention.
The present invention proposes the material and the manufacture method thereof of surface protecting layer for tuyere of blast furnace.Surface protecting layer is to be alloy (M refers to Ni or Co or Ni+Co) and high-hardness ceramic granulometric composition by high-temperature oxidation resistant, hot corrosion resistance, the higher MCrAlY of thermal fatigue resistance, its weave construction is typical sintering metal structure, ceramic particle dispersion is distributed in the metal bonding body, the shared volume percent of ceramic phase is in the 20-80% scope, and pottery is the Al of high rigidity
2O
3, TiB
2, ZrB
2, Si
3N
4, one or more the mixture among the Sialon; Surface protecting layer is to make like this, at first adopts powder metallurgical technique that the mixture sintering of MCrAlY series alloy powder and ceramic powder is become prefabricated component, and prefabricated component after will processing then and air port Cu matrix are joined together to form.
MCrAlY series alloy powder (M refers to Ni or Co or Ni+Co) in the material prescription of the surface protecting layer that the present invention proposes is 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 Ta, Co, Si, elements such as Hf, typical alloying constituent following (weight %): Ni17Cr6Al0.5Y, Ni22Cr10Al1.0Y, Ni25Cr6Al0.4Y, Ni31Cr11Al0.6Y, Ni23Co20Cr8.5Al4Ta0.6Y etc., appropriate change is Cr wherein, Al, Co, Ta, the content of elements such as Y is without prejudice to aim of the present invention.MCrAlY series alloy powder granularity below 20 orders, with-the 80+400 order is good.
Ceramic powder granularity in the surface protecting layer that the present invention proposes is-20 orders, with-the 35+60 order is good, for reducing the protective layer surface temperature, ceramic powder is from the high ZrB of thermal conductivity
2, TiB
2, Si
3N
4In be chosen as good.
The sintering metal prefabricated component is to adopt powder metallurgical technique to make, and generally adopts the be easy to get prefabricated component of higher-density of hot pressed sintering, and the prefabricated component density is not less than 85%, more preferably greater than 95%; For avoiding the oxidation of metal, sintering is preferably under vacuum or the protection of inert gas and carries out in the sintering.
The sintering metal prefabricated component also can adopt liquid sintering technology to carry out, and at this moment, should contain a kind of low melting point metal powder in the metal-powder at least, as Ni base self-fluxing alloy, and Ni base high-temp solder; Processing such as Electroless Plating Ni, Co, Cu can be adopted for improving wettability in ceramic powder surface, but also retes such as PVD Al, Ti, Cr.
The sintering metal prefabricated component is connected to the surface, air port and can adopts technologies such as hot edge, castingin, diffusion welding, soldering to finish, and wherein is best with the vacuum diffusion welding, and metal in the sintering metal prefabricated component and Cu or Cu alloy substrate can form metallurgical binding like this.
The surface protecting layer for tuyere of blast furnace that adopts prescription of the present invention and manufacture method to form has the following advantages:
1. slowly carry out in High Temperature Furnaces Heating Apparatus owing to sintering, the welding stress that does not exist bead-welding technology weld seam rapid heat cycle to cause, there is the manufacturing crackle hardly in the sintering metal prefabricated component that sinters into; 2. selected MCrAlY is that alloy has been compared high-temperature oxidation resistant, hot corrosion resistance preferably with the Ni base self-fluxing alloy that bead-welding technology is used always, can not occur the hot-short problem that overlay cladding often has during work, cause the not enough erosion attack that produces of ceramic particle grip strength because of the matrix metal premature failure with regard to not occurring like this; 3. compare with pure ceramic chamber lining, in the sintering metal lining ceramic particle degree less (＜1mm), in so little scope, the envrionment temperature field is uniform substantially, so so little ceramic particle itself can not ftracture in thermal shock, matrix metal toughness is better in addition, and the sintering metal structure thermal shock resistance of formation is more much higher than pure ceramic structure; 4. selected ceramic hardness all Mohs more than 7 grades than coal dust in hardness (the Mohs 5-6 level) height of quartz sand and pyrite impurity, so anti-erosion property is preferable; 5. the MCrAlY of sintering metal prefabricated component is that alloy can adopt when being connected with air port Cu matrix DIFFUSION TREATMENT to form metallurgical binding, and be difficult to form metallurgical binding between pure ceramic chamber lining and the Cu air port, so the surface protecting layer bonding strength that adopts the present invention to form is higher; Sintering metal thermal expansivity and Cu matrix are more approaching, so the thermal stresses that forms because of thermal dilation difference between the two is also lower, in sum, high temperature anti-impact erosion surface protecting layer and matrix bond that the present invention forms are more firm, the air port life-span can be enhanced about more than once.
Description of drawings
This figure is a kind of metallograph of surface protecting layer for tuyere of blast furnace, and white portion is the Ni25Cr6Al0.4Y matrix metal among the figure, and black part is divided into Al
2O
3Ceramic particle.
Example: metal-powder is business-like AMDRY963 type powder, and its composition is (weight %): Ni25Cr6Al0.4Y, and granularity is-the 140+400 order, takes by weighing 40g; Ceramic powder is white fused alumina, wherein Al
2O
3Content＞99%, granularity are-the 35+60 order to take by weighing 20g, with the evenly back hot pressing of two kinds of powder mixes; The hot pressing standard is: 1200 ℃ * 25MPa * 1h, all under the Ar gas shiled, the sintering metal structure of formation as shown in drawings for hot pressing whole process sample.Sintering metal piece after the hot pressing and T2 copper sheet are carried out vacuum diffusion welding, and welding condition are: 900 ℃ * 14MPa * 30min.
Claims (8)
1. surface protecting layer for tuyere of blast furnace and manufacture method thereof, surface protecting layer by high-temperature oxidation resistant, hot corrosion resistance preferably MCrAlY be alloy (M refers to Ni or Co or Ni+Co) and high-hardness ceramic granulometric composition, its weave construction is typical sintering metal structure, ceramic particle dispersion is distributed in the metal bonding body, the shared volume percent of ceramic phase is in the 20-80% scope, and pottery is Al
2O
3, TiB
2, ZrB
2, Si
3N
4, one or more the mixture among the Sialon; Surface protecting layer is to make like this, adopt powder metallurgical technique that the MCrAlY series alloy powder is become prefabricated component with the mixture sintering of ceramic powder, the prefabricated component after will processing then and air port Cu or Cu alloy substrate inwall or outer wall are joined together to form and combine firm surface protecting layer.
2. MCrAlY series alloy powder according to claim 1, it is characterized in that this powdered alloy is that NiCrAlY is a powder, each element percentage (weight %): Cr16-32 wherein, Al6-1l, Y0.1-1.0, surplus is Ni, typical alloying constituent is (weight %): Ni17Cr6Al0.5Y, Ni22Cr10Al1.0Y, Ni25Cr6Al0.4Y, Ni31Cr11Al0.6Y, based on above-mentioned alloy, to wherein adding Co, Ta, Si, Hf, elements such as Re are without prejudice to aim of the present invention, as the Ni23Co20Cr8.5Al4Ta0.6Y alloy, the powdered alloy granularity below-20 orders, with-the 80+400 order is good.
3. ceramic powder according to claim 1 is characterized in that its granularity is-20 orders, with-the 35+60 order is good.
4. method according to claim 1 is characterized in that surface protecting layer is to adopt hot-pressing sintering technique to make the sintering metal prefabricated component, and the prefabricated component after will processing then is connected to and forms on the matrix of air port.
5. method according to claim 1 is characterized in that prefabricated component adopts liquid phase sintering to make.
6. method according to claim 5 before the liquid phase sintering, adopts coating film treatment to ceramic powder, and plated film is Electroless Plating Ni, Co, Cu, or in PVDTi, Cr, the Al film one or both, wherein is best with the Electroless Plating Ni.
7. method according to claim 5, have a kind of low melting point Co-based alloy powder in the metal-powder raw material this moment.
8. method according to claim 1 is characterized in that being connected to a kind of in hot edge, diffusion welding, castingin, the soldering, wherein is best with diffusion welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97121998 CN1224764A (en) | 1997-12-24 | 1997-12-24 | Surface protecting layer for tuyere of blast furnace and its making process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97121998 CN1224764A (en) | 1997-12-24 | 1997-12-24 | Surface protecting layer for tuyere of blast furnace and its making process |
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| Publication Number | Publication Date |
|---|---|
| CN1224764A true CN1224764A (en) | 1999-08-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97121998 Pending CN1224764A (en) | 1997-12-24 | 1997-12-24 | Surface protecting layer for tuyere of blast furnace and its making process |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN102660727A (en) * | 2012-04-10 | 2012-09-12 | 闽东宏宇冶金备件有限公司 | Multi-component alloy co-impregnated impregnant |
| CN103060794A (en) * | 2013-01-22 | 2013-04-24 | 广东新劲刚新材料科技股份有限公司 | Nickel and titanium diboride mixed material and method for preparing coating on metal matrix |
| CN105970140A (en) * | 2016-06-22 | 2016-09-28 | 广东正德材料表面科技有限公司 | Nanometer composite structure feed and preparing method thereof |
-
1997
- 1997-12-24 CN CN 97121998 patent/CN1224764A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN102660727A (en) * | 2012-04-10 | 2012-09-12 | 闽东宏宇冶金备件有限公司 | Multi-component alloy co-impregnated impregnant |
| CN103060794A (en) * | 2013-01-22 | 2013-04-24 | 广东新劲刚新材料科技股份有限公司 | Nickel and titanium diboride mixed material and method for preparing coating on metal matrix |
| CN103060794B (en) * | 2013-01-22 | 2015-09-16 | 广东新劲刚新材料科技股份有限公司 | Nickel and TiB2 compound and on metallic matrix, make the method for coating |
| CN105970140A (en) * | 2016-06-22 | 2016-09-28 | 广东正德材料表面科技有限公司 | Nanometer composite structure feed and preparing method thereof |
| CN105970140B (en) * | 2016-06-22 | 2019-04-30 | 广东正德材料表面科技有限公司 | A kind of nano composite structure feeding and preparation method thereof |
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