CN110014207A - A kind of nano-scale rare earth doping improves gear roll of vertical furnace high temperature resistance technique and its bead welding wire - Google Patents
A kind of nano-scale rare earth doping improves gear roll of vertical furnace high temperature resistance technique and its bead welding wire Download PDFInfo
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- CN110014207A CN110014207A CN201910256296.6A CN201910256296A CN110014207A CN 110014207 A CN110014207 A CN 110014207A CN 201910256296 A CN201910256296 A CN 201910256296A CN 110014207 A CN110014207 A CN 110014207A
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- vertical furnace
- ceo
- nano
- gear roll
- rare earth
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/32—Selection of soldering or welding materials proper with the principal constituent melting at more than 1550 degrees C
- B23K35/325—Ti as the principal constituent
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/40—Making wire or rods for soldering or welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/04—Welding for other purposes than joining, e.g. built-up welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/235—Preliminary treatment
Abstract
The present invention relates to a kind of nano-scale rare earth dopings to improve gear roll of vertical furnace high temperature resistance technique, using doped with CeO2Nano particle H08MnA bead welding wire is 1-5 layers in gear roll of vertical furnace surface overlaying, welding current 120-140A, weldingvoltage 24-30V, the number of plies of built-up welding.Welding wire core wire uses H08MnA, and coating is bonded in core wire surface through waterglass, compositions of surfacing metal be high-carbon chromium iron, molybdenum-iron, vanadium iron, ferro-boron, fluorite, titanium dioxide, feldspar, graphite, remaining be CeO2Nano particle.Rare earths CeO_2 nano particle, Lai Tigao gear roll of vertical furnace heat resistance technique and its bead welding wire are added, the heat resistance of discaling roll can be significantly improved, and prolong the service life.
Description
Technical field
The present invention relates to gear roll of vertical furnace field, specifically a kind of nano-scale rare earth doping improves gear roll of vertical furnace heat-resisting quantity
It can technique and its bead welding wire.
Background technique
As the main charging appliance of shaft furnace, gear roll of vertical furnace has the effect of retainer and broken discharging, operation conditions meeting concurrently
Directly influence the production of shaft furnace.Due in certain special industries, such as steel mill, discaling roll can be made under the high temperature conditions for a long time
Situations such as industry, body of roll craze and transfiguration easy to form, bending, leak, seriously affect the service life of discaling roll.Cause this problem
The reason is that, the one side discaling roll body of roll easily occurs in casting, wall unevenness is even, has the defects of stomata or slag inclusion, on the other hand then
It is poor with the heat resistance of rolling body material itself.Traditional way can be adjusted body of roll structure, and select it is carbon containing and
The body of roll is cast containing the higher steel of manganese.But effect and not fully up to expectations.
The prior art generallys use built-up welding mode and increases thermal barrier coating in the body of roll to improve the heat resistance of the welding body of roll to increase
Add its service life.However, technique for overlaying can still have the deficiencies of built-up welding thickness and welding stabilization, quality, directly affect
To the performance of final gear roll of vertical furnace.
Summary of the invention
The problems such as in order to solve in hot environment operation, gear roll of vertical furnace is thermo-labile, perishable, service life is short, this hair
Bright to propose a kind of by adding rare earths CeO_2 nano particle in the surface covering of the gear roll of vertical furnace body of roll, Lai Tigao gear roll of vertical furnace is resistance to
Warm nature energy technique and its bead welding wire, can significantly improve the heat resistance of discaling roll, and prolong the service life.
The technical solution adopted by the present invention is that: a kind of nano-scale rare earth doping raising gear roll of vertical furnace high temperature resistance technique,
It is characterized by: using doped with CeO2Nano particle H08MnA bead welding wire is in gear roll of vertical furnace surface overlaying, welding current
120-140A, weldingvoltage 24-30V, the number of plies of built-up welding are 1-5 layers.
Further, gear roll of vertical furnace body of roll material ZG40-45CrMn steel, roller head material 45# steel carry out built-up welding using to welding machine
Operation, 800-850 DEG C of preheating temperature, then it is warming up to 850-870 DEG C, it is cooled to 600 DEG C within 3-6 hours, comes out of the stove air-cooled；Using doping
There is CeO2Nano particle H08MnA bead welding wire is in gear roll of vertical furnace surface overlaying, welding current 120-140A, weldingvoltage
24-30V, the number of plies of built-up welding are 4 layers, and heap postwelding is tempered in SX2-8-10 type chamber type electric resistance furnace, and tempering temperature is
650 DEG C, time 4h.
A kind of nano-scale rare earth doping raising gear roll of vertical furnace high temperature resistance bead welding wire, core wire use H08MnA, coating
Core wire surface, the mass component of compositions of surfacing metal are bonded in through waterglass are as follows: 5-8 parts of high-carbon chromium iron, 4-6 parts of molybdenum-iron, vanadium iron 5-8
Part, 4-7 parts of ferro-boron, 7-9 parts of fluorite, 25-30 parts of titanium dioxide, 11-15 parts of feldspar, 7-9 parts of graphite, remaining is CeO2Nanometer
Grain, CeO2The mass parts of nano particle account for coating gross mass part 0.5-1%.
Further, the mass component of the compositions of surfacing metal are as follows: 8 grams of high-carbon chromium iron, 6 grams of molybdenum-iron, 8 grams of vanadium iron, ferro-boron 6
Gram, 9 grams of fluorite, 30 grams of titanium dioxide, 15 grams of feldspar, 9 grams of graphite, CeO20.9 gram of nano particle, the binder of coating is water glass
Glass.
Further, the CeO2Nano particle diameter is 10-25nm.
Further, the CeO2Nano particle, by CeO2Powder and carbon black are according to mass ratio 1:4 in periodical stirring ball mill
In be made, drum's speed of rotation 800r/min, the time be 4 hours.
The preparation of bead welding wire is prepared using general conventional manufacturing process in industry using following techniques: with powder,
Steel band slitting, wire drawing, twines axis, packaging process to get this welding wire is arrived at rolling.
The beneficial effects of the present invention are: the CeO2 particle of nanostructure have be unlikely to deform, hardness is higher, wear-resisting and corrosion resistant
The characteristic of erosion, furthermore CeO2 particle also has both the double effects of nano effect and active effect.CeO2 nano particle be not added
When, wlding poor fluidity in cladding process, so that the cooling velocity close to surfacing equipment side is slower than internal cooling velocity, meeting
Equiax crystal is formed in cladding layer.And be added after CeO2 nano particle, rare earth particle can accelerate the mobility of cladding layer, make
It obtains internal heat to be evenly distributed, coating forms inside and outside consistent consolidated structure.In the high temperature environment, oxygen can rapidly occur for coating
Change, under normal circumstances, oxidation film can constantly volatilize and form defect, these defects can become oxygen element or other corrosivity member
The channel that element is inwardly spread.Be added CeO2 nano particle after, the nano particle being distributed between lattice can block oxygen element and
Infiltration of other corrosive elements into film, CeO2 nano particle can also prevent the outside diffusion of Cr element, reduce in coating
The reduction in element vacancy.In addition, nanoscale CeO2 rare earth particle can improve the connection machine between coating and matrix in thermal shock
System can greatly improve coating and matrix junction to the resistivity of thermal shock.Therefore, using nano rare earth particle as changing
Property ingredient is added in thermal barrier coating, can effectively improve coating texture, also may make the anti-oxidant and corrosion resistant of coating
Corrosion is significantly improved.
Nano-scale rare earth particle has nano effect and active effect, is added to thermal barrier coating as altered contents
In, it can not only improve coating structure, the anti-oxidant of coating, high temperature resistant, corrosion resistant performance can also be made to get a promotion.In order to
The service life for further promoting gear roll of vertical furnace, increases CeO2 nano particle in the resurfacing welding material of the body of roll, can effectively be promoted
The uniformity of thermal barrier coating improves the heat resistance of the body of roll, improves the service life of gear roll of vertical furnace.
Detailed description of the invention
Fig. 1 is the layer scanning electron microscope (SEM) photograph of embodiment 1；
Fig. 2 is the layer scanning electron microscope (SEM) photograph that CeO2 nano particle is not added.
Specific embodiment
Below in conjunction with drawings and examples, the invention will be further described.
Embodiment 1
A kind of nano-scale rare earth doping raising gear roll of vertical furnace high temperature resistance technique, using doped with CeO2Nano particle H08MnA
Bead welding wire is in gear roll of vertical furnace surface overlaying, gear roll of vertical furnace body of roll material ZG40-45CrMn steel, roller head material 45# steel, using pair
Welding machine progress overlay-operation, 840 DEG C of preheating temperature, then 860 DEG C are warming up to, it is cooled to 600 DEG C within 5 hours, comes out of the stove air-cooled；Using mixing
It is miscellaneous to have CeO2Nano particle H08MnA bead welding wire is in gear roll of vertical furnace surface overlaying, welding current 130A, weldingvoltage
26V, the number of plies of built-up welding are 4 layers, and heap postwelding is tempered, tempering temperature 650 in SX2-8-10 type chamber type electric resistance furnace
DEG C, time 4h.
Above-mentioned bead welding wire, core wire use H08MnA, and coating is bonded in core wire surface, the quality of compositions of surfacing metal through waterglass
Component are as follows: 8 grams of high-carbon chromium iron, 6 grams of molybdenum-iron, 8 grams of vanadium iron, 6 grams of ferro-boron, 9 grams of fluorite, 30 grams of titanium dioxide, 15 grams of feldspar, graphite
9 grams, CeO20.9 gram of nano particle, the binder of coating is waterglass；CeO2Nano particle diameter is 10-25nm, CeO2Nanometer
Particle is by CeO2Powder and carbon black are made in periodical stirring ball mill according to mass ratio 1:4, drum's speed of rotation 800r/min,
Time is 4 hours.
Using chamber type electric resistance furnace in 1000 degrees Celsius of progress thermal shock experiments, the layer section Electronic Speculum of Fig. 1 the present embodiment is observed
Scanning figure compares un-added attached drawing 2, and overlay cladding is more evenly.Comparison is not added with the sample of ceria nanopowder doping, doped with CeO2
Nano particle have less thermal shock crackle, compared to have preferable high temperature resistance.
Embodiment 2
A kind of nano-scale rare earth doping raising gear roll of vertical furnace high temperature resistance technique, using doped with CeO2Nano particle H08MnA
Bead welding wire is in gear roll of vertical furnace surface overlaying, gear roll of vertical furnace body of roll material ZG40-45CrMn steel, roller head material 45# steel, using pair
Welding machine progress overlay-operation, 800 DEG C of preheating temperature, then 850 DEG C are warming up to, it is cooled to 600 DEG C within 3 hours, comes out of the stove air-cooled；Using mixing
It is miscellaneous to have CeO2Nano particle H08MnA bead welding wire is in gear roll of vertical furnace surface overlaying, welding current 120A, weldingvoltage
24V, the number of plies of built-up welding are 4 layers, and heap postwelding is tempered, tempering temperature 650 in SX2-8-10 type chamber type electric resistance furnace
DEG C, time 4h.
Above-mentioned bead welding wire, core wire use H08MnA, and coating is bonded in core wire surface, the quality of compositions of surfacing metal through waterglass
Component are as follows: 8 parts of high-carbon chromium iron, 4 parts of molybdenum-iron, 8 parts of vanadium iron, 7 parts of ferro-boron, 7 parts of fluorite, 25 parts of titanium dioxide, 15 parts of feldspar, graphite
9 parts, remaining is CeO2Nano particle 0.84g, the binder of coating are waterglass；CeO2Nano particle diameter is 10-25nm,
CeO2Nano particle is by CeO2Powder and carbon black are made in periodical stirring ball mill according to mass ratio 1:4, and drum's speed of rotation is
800r/min, time are 4 hours.
Embodiment 3
A kind of nano-scale rare earth doping raising gear roll of vertical furnace high temperature resistance technique, using doped with CeO2Nano particle H08MnA
Bead welding wire is in gear roll of vertical furnace surface overlaying, gear roll of vertical furnace body of roll material ZG40-45CrMn steel, roller head material 45# steel, using pair
Welding machine progress overlay-operation, 850 DEG C of preheating temperature, then 870 DEG C are warming up to, it is cooled to 600 DEG C within 6 hours, comes out of the stove air-cooled；Using mixing
It is miscellaneous to have CeO2Nano particle H08MnA bead welding wire is in gear roll of vertical furnace surface overlaying, welding current 140A, weldingvoltage
30V, the number of plies of built-up welding are 4 layers, and heap postwelding is tempered, tempering temperature 650 in SX2-8-10 type chamber type electric resistance furnace
DEG C, time 4h.
Above-mentioned bead welding wire, core wire use H08MnA, and coating is bonded in core wire surface, the quality of compositions of surfacing metal through waterglass
Component are as follows: 5 parts of high-carbon chromium iron, 6 parts of molybdenum-iron, 5 parts of vanadium iron, 4 parts of ferro-boron, 9 parts of fluorite, 30 parts of titanium dioxide, 11 parts of feldspar, graphite
7 parts, CeO2Nano particle 0.39g, the binder of coating are waterglass；CeO2Nano particle diameter is 10-25nm, CeO2Nanometer
Particle is by CeO2Powder and carbon black are made in periodical stirring ball mill according to mass ratio 1:4, drum's speed of rotation 800r/min,
Time is 4 hours.
Claims (6)
1. a kind of nano-scale rare earth doping improves gear roll of vertical furnace high temperature resistance technique, it is characterised in that: using doped with CeO2It receives
Rice grain H08MnA bead welding wire is in gear roll of vertical furnace surface overlaying, welding current 120-140A, weldingvoltage 24-30V, heap
The number of plies of weldering is 1-5 layers.
2. a kind of nano-scale rare earth doping according to claim 1 improves gear roll of vertical furnace high temperature resistance technique, feature
Be: gear roll of vertical furnace body of roll material ZG40-45CrMn steel, roller head material 45# steel carry out overlay-operation, preheating using to welding machine
800-850 DEG C of temperature, then it is warming up to 850-870 DEG C, it is cooled to 600 DEG C within 3-6 hours, comes out of the stove air-cooled；Using doped with CeO2It receives
Rice grain H08MnA bead welding wire is in gear roll of vertical furnace surface overlaying, welding current 120-140A, weldingvoltage 24-30V, heap
The number of plies of weldering is 4 layers, and heap postwelding is tempered in SX2-8-10 type chamber type electric resistance furnace, and tempering temperature is 650 DEG C, the time
For 4h.
3. a kind of a kind of nano-scale rare earth doping raising gear roll of vertical furnace high temperature resistance bead welding wire described in claim 1,
Be characterized in that: core wire uses H08MnA, and coating is bonded in core wire surface, the mass component of compositions of surfacing metal are as follows: high-carbon through waterglass
5-8 parts of ferrochrome powder, 4-6 parts of molybdenum-iron, 5-8 parts of vanadium iron, 4-7 parts of ferro-boron, 7-9 parts of fluorite, 25-30 parts of titanium dioxide, feldspar 11-15
Part, 7-9 parts of graphite, remaining is CeO2Nano particle, CeO2The mass parts of nano particle account for coating gross mass part 0.5-1%.
4. a kind of nano-scale rare earth doping according to claim 2 improves gear roll of vertical furnace high temperature resistance bead welding wire,
It is characterized in that: the mass component of the compositions of surfacing metal are as follows: 8 grams of high-carbon chromium iron, 6 grams of molybdenum-iron, 8 grams of vanadium iron, 6 grams of ferro-boron, fluorite 9
Gram, 30 grams of titanium dioxide, 15 grams of feldspar, 9 grams of graphite, CeO20.9 gram of nano particle, the binder of coating is waterglass.
5. a kind of nano-scale rare earth doping according to claim 1 to 3 improves gear roll of vertical furnace high temperature resistance built-up welding weldering
Silk, it is characterised in that: the CeO2Nano particle diameter is 10-25nm.
6. a kind of nano-scale rare earth doping according to claim 1 to 3 improves gear roll of vertical furnace high temperature resistance built-up welding weldering
Silk, it is characterised in that: the CeO2Nano particle, by CeO2Powder and carbon black are according to mass ratio 1:4 in periodical stirring ball mill
It is made, drum's speed of rotation 800r/min, the time is 4 hours.
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| CN201910256296.6A CN110014207B (en) | 2019-04-01 | 2019-04-01 | Process for improving high-temperature resistance of vertical furnace gear roller by doping nano-grade rare earth |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104400259A (en) * | 2014-10-27 | 2015-03-11 | 武汉铁锚焊接材料股份有限公司 | High-hardness hardfacing electrode |
| CN105057926A (en) * | 2015-09-22 | 2015-11-18 | 山东大学 | Special flux-cored wire for hot-working die repairing surfacing |
| CN105081706A (en) * | 2015-09-18 | 2015-11-25 | 江苏盛日机械设备制造有限公司 | Nanometer shaft furnace pin roll preparing method |
| CN105149882A (en) * | 2015-09-18 | 2015-12-16 | 江苏盛日机械设备制造有限公司 | High-strength high-alloy furnace roller production equipment system |
| CN105618956A (en) * | 2016-03-09 | 2016-06-01 | 苏州新普新材料科技有限公司 | Production method for welding rod special for nuclear power 20 control chromium steel |
| CN108971800A (en) * | 2018-10-29 | 2018-12-11 | 山东大学 | A kind of antiwear heat resisting built-up welding cermet welding rod |
-
2019
- 2019-04-01 CN CN201910256296.6A patent/CN110014207B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104400259A (en) * | 2014-10-27 | 2015-03-11 | 武汉铁锚焊接材料股份有限公司 | High-hardness hardfacing electrode |
| CN105081706A (en) * | 2015-09-18 | 2015-11-25 | 江苏盛日机械设备制造有限公司 | Nanometer shaft furnace pin roll preparing method |
| CN105149882A (en) * | 2015-09-18 | 2015-12-16 | 江苏盛日机械设备制造有限公司 | High-strength high-alloy furnace roller production equipment system |
| CN105057926A (en) * | 2015-09-22 | 2015-11-18 | 山东大学 | Special flux-cored wire for hot-working die repairing surfacing |
| CN105618956A (en) * | 2016-03-09 | 2016-06-01 | 苏州新普新材料科技有限公司 | Production method for welding rod special for nuclear power 20 control chromium steel |
| CN108971800A (en) * | 2018-10-29 | 2018-12-11 | 山东大学 | A kind of antiwear heat resisting built-up welding cermet welding rod |
Non-Patent Citations (3)
| Title |
|---|
| 洪海峰等: "纳米CeO_2对铁基合金喷焊层组织和耐磨性的影响 ", 《热处理》 * |
| 王爱华等: "纳米CeO_2粉体对铁粉焊条焊缝组织和性能影响的研究 ", 《兵器材料科学与工程》 * |
| 王爱华等: "纳米稀土氧化物对铁粉焊条焊缝低温冲击韧度的影响 ", 《热加工工艺》 * |
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