CN101574761B - Powder-cored welding wire used for surface cladding of high-temperature thermocouple protection tube and preparation method thereof - Google Patents
Powder-cored welding wire used for surface cladding of high-temperature thermocouple protection tube and preparation method thereof Download PDFInfo
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- CN101574761B CN101574761B CN2009100861743A CN200910086174A CN101574761B CN 101574761 B CN101574761 B CN 101574761B CN 2009100861743 A CN2009100861743 A CN 2009100861743A CN 200910086174 A CN200910086174 A CN 200910086174A CN 101574761 B CN101574761 B CN 101574761B
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Abstract
A power-cored welding wire used for surface cladding of a high-temperature thermocouple protection tube and a preparation method thereof belong to the field of surface engineering technology. The mixed powder of the powder-cored welding wire is prepared by Mo, Si, Al, ZrO2 and Ni, in which consists of 30-44.1 of Mo, 17.6-26 of Si, 14.5-22 of Al, 0-2 of ZrO2 and the balance of Ni by weight percentage; the weight ratio of the Mo and the Si is within 1.69-1.71; and the powder-cored wire is formed by wrapping the composite powders with a nickel foil. The composite powder occupies 85-86% of the weight of the powder-cored wire and the powder-cored welding wire is fused on the external surface of the protection tube substrate material by an arc welding gun. The powder-cored welding wire and the preparation method have the advantages of avoiding the shortages of bad heat-shock resistance of the ceramic material, good heat conductivity, strong heat-shock resistance, heat resistance, wearabilityand the like. The anti-oxidation temperature of the prepared cladding can achieve 1300 DEG C to the highest extent and the room temperature hardness can achieve 900-1100 HV.
Description
Technical field
The invention belongs to field of surface engineering technique, particularly a kind of powder-cored welding wire and preparation method who is used for surface cladding of high-temperature thermocouple protection tube is suitable for preparing the flux cored wire that Mo-Si-Ni-A1 is a cladding layer.
Technical field
The cement production enterprise production line all will carry out temperature survey to dore furnace middle part, kiln tail cigarette, kiln hood cover etc., and the claimed pipe of some measuring points was worked 1000-1300 ℃ range of temperature and erosion following long-life of condition.The thermocouple protective casing material of having used on cement industry at present mainly contains high temperature alloy protection tube and ceramic protecting pipe two big classes.The advantage of high temperature alloy protection tube is intensity height, decay resistance and good heat conductivity.But under 1000 ℃ and above temperature, intensity, the wearability of high temperature alloy protection tube sharply descend, and this makes that the life-span of high temperature alloy pipes is short, needs the frequent protection tube of changing, and can't satisfy the requirement of cement production enterprise ordinary production.
The common used material of ceramic protecting pipe has quartz, refractory ceramics, magnesia, aluminium oxide, MoSi
2(molybdenum disilicide) etc.Though ceramic protecting pipe has high high temperature abrasion resistance, shortcoming such as with the metal material ratio, ceramic protecting pipe exists that heat conduction rate variance, machinability are poor, thermal response sensitiveness difference and thermal shock resistance difference.Because the ceramic protecting pipe thermal shock resistance is poor, in use there is the problem that causes protection tube embrittlement because of impact and thermal shock.
In the candidate material of ceramic protecting pipe, MoSi
2Material has high high-temperature oxidation and receives much concern.MoSi
2Fusing point up to 2030 ℃, its atom combination is a covalent bond and the mixing of metallic bond, it has the combination property of pottery and metal, has excellent oxidation-resistance property, have corrosion resistant function (except oxidizing acid and the salt) under ambient conditions such as most acid, alkali, salt, also have good electrical conductivity, high heat endurance and resist the ability of molten metal bath etches such as sodium, tin, lead, lithium, bismuth.But MoSi
2Parts often adopt powder metallurgy process production, and this method makes MoSi
2Product size and shape are very restricted.As adopt powder metallurgy process to produce MoSi
2Also there is following shortcoming in protection tube: (1) protection tube at room temperature has the fragility of pottery and is difficult to processing or welding; (2) MoSi in 400～700 ℃ of temperature ranges
2Can produce serious efflorescence Problem of Failure; (3) the production cost height makes MoSi
2Protection tube is difficult to apply on a large scale.
As select the matrix material of high temperature alloy for use, and on matrix material, prepare MoSi as protection tube
2The high temperature resistant coat of class just can be avoided above-mentioned shortcoming, makes protection tube have the toughness of matrix material in room temperature-middle temperature; When high temperature, the elevated temperature strength of protection tube is determined by selected matrix material, and MoSi
2Coat is born resistance to high temperature oxidation, wear-resisting function.
As only adopting MoSi
2As resistance to high temperature oxidation, wear-resisting coat material, have following shortcoming: (1) is because MoSi
2Do not match with matrix alloy material coefficient of thermal expansion coefficient, in the process of rapid solidification, produce very big thermal stress and structural stress, the process that coating is shunk in cooling produces a large amount of transversal cracks, and this will have a strong impact on resistance to high temperature oxidation, the anti-wear performance of coat; (2) in 400～700 ℃ between warm area, MoSi
2The surface also can't form the SiO of even compact
2Diaphragm causes O along the crystal boundary rapid diffusion, and catastrophic " efflorescence " phenomenon takes place.
Summary of the invention
The object of the present invention is to provide a kind of powder-cored welding wire and preparation method who is used for surface cladding of high-temperature thermocouple protection tube; having proposed a kind of Mo-Si-Ni-Al of formation is the method for high temperature oxidation resisting, wear-resisting cladding layer and the powder-cored welding wire that is used for surface cladding of high-temperature thermocouple protection tube, and utilizing argon arc cladding method to prepare Mo-Si-Ni-Al on high-temperature alloy protection tube matrix is high temperature resistant, wear-resisting cladding layer.This protection tube has been taken into account the advantage of metal and pottery, has advantages such as thermal conductivity is good, thermal shock resistance is strong, heat-resisting, wear-resisting.
Mixed-powder in the flux cored wire of the present invention is by Mo, Si, Al, Ni, ZrO
2Form, the scope of each component weight is: Mo:30-44.1wt.%, Si:17.6-26%, Al:14.5-22%, ZrO
2: 0-2%, Ni: surplus; In the above powder, the weight ratio of Mo and Si is in the 1.69-1.71 scope; Utilize nickel foil to wrap up above-mentioned composite powder and form powder core silk.
Composite powder shared percentage by weight in powder core silk is 85-86%, utilize argon-arc welding gun with the flux cored wire cladding at protection tube matrix material outer surface.
Preparation technology of the present invention may further comprise the steps:
1, selects for use at the protection tube outer surface and prepare the flux cored wire that the high-temperature wearable cladding layer is used.
(1) takes by weighing dusty material by following proportioning: Mo (purity 99-99.9%, granularity 200-300 order): 30-44.1wt.%, Si (purity 99-99.9%, granularity 100-300 order): 17.6-26wt.%, Al (purity 99-99.9%, granularity 200-300 order): 14.5-22wt.%, ZrO
2(purity 99-99.9%, granularity 200-300 order): 0-2wt.%, Ni (purity 99-99.9%, granularity 100-200 order): surplus.In the above powder, the weight ratio of Mo and Si is in the 1.69-1.71 scope.Above-mentioned powder is placed drying box, descended dry 2-3 hour, in ball mill, carried out then ball mill mixing 3-5 hour, obtain mixed-powder at 90-110 ℃.In the mixed-powder, the purpose that contains Mo, Si is to make to generate high temperature oxidation resisting, wear-resisting molybdenum-silicon compound (MoSi in the cladding layer
2, Mo
5Si
3).Add ZrO in the mixed-powder
2Purpose be crystal grain thinning, improve cladding layer toughness.In addition, a spot of Al atom also will be replaced MoSi in the process of argon arc cladding
2Middle Si atom formation Mo (Ai, Si)
2Phase, thus MoSi further improved
2The resistance to high temperature oxidation temperature, improve mechanical behavior under high temperature and suppress MoSi
2In warm efflorescence.Under the high temperature, the Si in the cladding layer, Al element generation selective oxidation preferentially combine with oxygen, form complete, fine and close, stable SiO at clad surface
2, Al
2O
3Protective layer stops the further diffusion of oxygen, thereby makes cladding layer possess excellent oxidation-resistance property.
(2) select the skin material of Ni paper tinsel (purity 〉=99%, thickness are 50-200 μ m, and width is 25-50mm, length 300-400mm) for use as the above-mentioned mixed-powder of parcel.Utilize construction materials contract mechanical device manual or preparation powder core silk that mixed-powder is wrapped in the Ni paper tinsel, form flux cored wire with sub-circular cross section.Mixed-powder shared percentage by weight in flux cored wire is 85-86wt.%.
2, with Ni-based or iron-base superalloy as matrix tubing, the internal diameter of matrix tubing is in the 6-15mm scope, pipe thickness is in the 4-10mm scope, pipe length is in the 200-1500mm scope.In order to prevent that tubing from taking place in cladding process that tube wall subsides or the thermal flexure problem, implementing needs fill graphite carbon rod before the melting and coating process in tubing.If pipe internal diameter is d
0Mm, then the graphite carbon rod diameter is (d
0-0.5) mm.
3, treat cladding matrix outer pipe wall and carry out oil removing, abatement processes and derusting by sandblasting processing.
4, utilize the cladding workbench to implement melting and coating process.To treat that cladding tubing one end is fixed on the scroll chuck by the buncher driven rotary, and add V-arrangement bracing frame (when pipe length does not need bracing frame during less than 620mm) at the pipeline section that tubing need not prepare cladding layer.Arrangements for speed regulation control scroll chuck by workbench rotates, thereby realizes rotatablely moving of tubing; Argon-arc welding gun is fixed on the wig-wag, and the wig-wag base is fixed on by leading screw and drives on the flat board of moving linearly.Adopt manual feeding method to prepare cladding layer, come into effect melting and coating process from tubing free end outer surface.By control tubing rotary speed, by the dull and stereotyped translational speed of leading screw driving, manual wire feed rate, thereby realize relative screw and the continuous overlap joint cladding of argon-arc welding gun, obtain the cladding layer that thickness is 1.5-3mm at pipe outer surface at pipe outer surface.The melting and coating process parameter is as follows: argon-arc welding gun cladding electric current is 150-300A, wig-wag amplitude of oscillation value is that 1-4mm, hunting frequency are 0.3-0.8Hz, the rotating speed of tubing is 2-6rpm, and driving dull and stereotyped translational speed by leading screw is 0.5-1.5mm/s, and manually the average wire feed rate of wire feed is 1.5-4mm/s.By individual layer, overlap joint cladding, obtain the cladding layer that thickness is 1.5-3mm by above-mentioned technological parameter at outer pipe wall.Length with cladding layer tubing is 280-400mm.After finishing cladding layer preparation technology, the tubing that will have cladding layer unloads from workbench.Cladding workbench photo in kind is seen Fig. 5.
5, selecting diameter for use is the material of the nickel base superalloy bar (as GH3039) of 6-15mm as the sealing pipe end, and establishing pipe internal diameter is d, and then bar being processed into diameter is that d+0.5mm, length are the plug of 12mm; Utilize manual knocking that plug is pressed into the open-ended place of the tubing with cladding interval, make the end sealing of tubing; At the described flux cored wire of tubing blind end manual build up welding step 1, end face cladding layer thickness is 4-8mm then.
6, the tubing with cladding layer is carried out grinding, make external diameter, length and the end size of tubing reach designing requirement, and utilize manual vibrations hammering method to remove the inner graphite carbon rod of filling of protection tube.
The invention has the advantages that, avoided the shortcoming of shaking property of ceramic material heat resistanceheat resistant difference, have advantages such as thermal conductivity is good, thermal shock resistance is strong, heat-resisting, wear-resisting.The oxidation resistance temperature of the prepared cladding layer of the present invention reaches as high as 1300 ℃, and its room temperature hardness can reach 900-1100HV.
Description of drawings
Fig. 1 is the XRD result of cladding layer, NiAl phase 1, Mo (Si, Al)
2Phase 2, Mo
5Si
3Phase 3.
Fig. 2 is a cladding layer profile scanning electromicroscopic photograph.
Fig. 3 is the stereoscan photograph of 1100 ℃ of high-temperature oxydations cladding layer oxide on surface after 100 hours, Al
2O
3-SiO
2Composite oxides 4.
Fig. 4 be protection tube along the axis direction sectional view, tubing matrix 5, cladding layer 6, plug 7, blind end cladding layer 8.
Fig. 5 is cladding workbench photo in kind.
The specific embodiment
Embodiment
1, preparation flux cored wire.
(1) takes by weighing dusty material by following proportioning: Mo (purity 99.9%, granularity-200 order): 36wt.%, Si (purity 99.9%, granularity-200 order): 21.2wt.%, Al (purity 99.9%, granularity-200 order): 18.4wt.%, ZrO
2(purity 99-99.9%, granularity-250 order): 2wt.%, Ni (purity 99.9%, granularity-100 order): surplus.Above-mentioned powder is placed drying box, and drying is 3 hours under 110 ℃, carries out ball mill mixing 5 hours in ball mill then, obtains mixed-powder.
(2) select the skin material of Ni paper tinsel (purity 〉=99%, thickness are 80 μ m, and width is 40mm, and length is 350mm) for use as the above-mentioned mixed-powder of parcel.Utilize manual construction materials contract method that mixed-powder is wrapped in the Ni paper tinsel, mixed-powder shared percentage by weight in flux cored wire is 85%.
2, selected GH3039 nickel base superalloy pipe is as matrix tubing, and its internal diameter is that 8mm, pipe thickness are that 6mm, pipe length are 600mm.Implement to fill graphite carbon rod before the melting and coating process in tubing, the graphite carbon rod diameter is 7.5mm.
3, treat cladding matrix outer pipe wall and carry out oil removing, abatement processes and derusting by sandblasting processing.
4, the end that will treat cladding tubing is fixed on the rotatable chuck of cladding workbench its other end freedom.Arrangements for speed regulation control chuck by workbench rotates, thereby realizes rotatablely moving of tubing; Argon-arc welding gun is fixed on the wig-wag, and the wig-wag base is fixed on by leading screw and drives on the flat board of moving linearly.Come into effect melting and coating process from tubing free end outer surface.By control tubing rotary speed, by the dull and stereotyped translational speed of leading screw driving, manual wire feed rate, thereby realize that argon-arc welding gun is in the relative screw of pipe outer surface and overlap joint cladding continuously, obtain the cladding layer that average thickness is 2.5mm at pipe outer surface, the length with cladding layer tubing is 300mm.The melting and coating process parameter is as follows: argon-arc welding gun cladding electric current is 260A, wig-wag amplitude of oscillation value is that 2.5mm, hunting frequency are 0.5Hz, the rotating speed of tubing is 3rpm, and driving dull and stereotyped translational speed by leading screw is 0.75mm/s, and manually the average wire feed rate of wire feed is about 3mm/s.After finishing cladding layer preparation technology, tubing is unloaded from workbench.
5, selecting diameter for use is the material of the GH3039 bar of 10mm as the sealing pipe end, and it is that 8.05mm, length are the plug of 12mm that bar is processed into diameter; Utilize manual knocking that plug is pressed into the open-ended place of the tubing with cladding interval, make the end sealing of tubing; At the described flux cored wire of tubing blind end built-up welding step 1, end face cladding layer thickness is 6mm then.
6, the tubing with cladding layer is carried out grinding, the external diameter that makes tubing is 22mm.Utilize manual vibrations hammering method to remove the inner graphite carbon rod of filling of protection tube.
The XRD result of Fig. 1 for pressing embodiment 1 gained cladding layer; Fig. 2 is for pressing embodiment 1 gained cladding layer profile scanning electromicroscopic photograph; Fig. 3 is for to press the field emission scanning electron microscope photo (10000 times) of embodiment 1 gained cladding layer at 1100 ℃ of following high-temperature oxydations cladding layer oxide on surface after 100 hours, and according to EDAX results, the surface has generated fine and close oxide-film, and oxide particle is mainly by Al
2O
3-SiO
2Form; Fig. 4 finishes protection tube behind the above-mentioned preparation technology along the axis direction sectional view, and Fig. 5 is cladding workbench photo in kind.
Claims (5)
1. a powder-cored welding wire that is used for surface cladding of high-temperature thermocouple protection tube is characterized in that, the mixed-powder in the powder-cored welding wire is by Mo, Si, Al, ZrO
2, Ni forms, the scope of each component weight is: Mo:30-44.1wt.%, Si:17.6-26%, Al:14.5-22%, 0＜ZrO
2≤ 2%, Ni: surplus; In the above powder, the weight ratio of Mo and Si is in the 1.69-1.71 scope; Utilize nickel foil to wrap up above-mentioned mixed-powder and form powder-cored welding wire.
2. according to the described powder-cored welding wire of claim 1, it is characterized in that mixed-powder shared percentage by weight in powder-cored welding wire is 85-86%, utilize argon-arc welding gun with the powder-cored welding wire cladding at protection tube matrix material outer surface.
3. one kind is used the described powder-cored welding wire of claim 1 to prepare the method that is used for the surface cladding of high-temperature thermocouple protection tube layer, it is characterized in that preparation technology is:
(1) select for use at the protection tube outer surface and prepare the powder-cored welding wire that the high-temperature wearable cladding layer is used:
Take by weighing dusty material by following proportioning: Mo:30-44.1wt.%, Si:17.6-26wt.%, Al:14.5-22wt.%, ZrO
2: 0＜ZrO
2≤ 2%, Ni: surplus; In the above powder, the weight ratio of Mo and Si is in the 1.69-1.71 scope; Above-mentioned powder is placed drying box, descended dry 2-3 hour, in ball mill, carried out then ball mill mixing 3-5 hour, obtain mixed-powder at 90-110 ℃; Select the skin material of Ni paper tinsel for use as the above-mentioned mixed-powder of parcel, utilize construction materials contract mechanical device manual or the preparation powder-cored welding wire that mixed-powder is wrapped in the Ni paper tinsel, formation has the powder-cored welding wire in sub-circular cross section, and mixed-powder shared percentage by weight in powder-cored welding wire is 85-86wt.%;
(2) with the Ni-based or iron-base superalloy matrix tubing as described high-temperature thermocouple protection tube, the internal diameter of the matrix tubing of described high-temperature thermocouple protection tube is in the 6-15mm scope, and pipe thickness is in the 4-10mm scope, and pipe length is in the 200-1500mm scope;
(3) utilize the cladding workbench to implement melting and coating process; Described melting and coating process is: will treat that cladding tubing one end is fixed on the scroll chuck by the buncher driven rotary, and add the V-arrangement bracing frame at the pipeline section that tubing need not prepare cladding layer, arrangements for speed regulation control scroll chuck by the cladding workbench rotates, and realizes rotatablely moving of tubing; Argon-arc welding gun is fixed on the wig-wag, and the wig-wag base is fixed on by leading screw and drives on the flat board of moving linearly; Adopt manual feeding method to prepare cladding layer, come into effect melting and coating process from tubing free end outer surface; By control tubing rotary speed, by the dull and stereotyped translational speed of leading screw driving, manual wire feed rate, thereby realize relative screw and the continuous overlap joint cladding of argon-arc welding gun, obtain the cladding layer that thickness is 1.5-3mm at pipe outer surface at pipe outer surface;
(4) selecting diameter for use is the material of the nickel base superalloy bar of 6-15mm as the sealing pipe end, and establishing pipe internal diameter is d, and then bar being processed into diameter is that d+0.5mm, length are the plug of 12mm; Utilize manual knocking that plug is pressed into the open-ended place of the tubing with cladding interval, make the end sealing of tubing; At the described powder-cored welding wire of tubing blind end manual build up welding step (1), end face cladding layer thickness is 4-8mm then;
(5) tubing with cladding layer is carried out grinding, make external diameter, length and the end size of tubing reach designing requirement.
4. method according to claim 3 is characterized in that, the purity of described Ni paper tinsel 〉=99%, thickness are 50-200 μ m, and width is 25-50mm, length 300-400mm.
5. method according to claim 3, it is characterized in that, the technological parameter of described melting and coating process is: argon-arc welding gun cladding electric current is 150-300A, wig-wag amplitude of oscillation value is that 1-4mm, hunting frequency are 0.3-0.8Hz, the rotating speed of tubing is 2-6rpm, driving dull and stereotyped translational speed by leading screw is 0.5-1.5mm/s, and manually the average wire feed rate of wire feed is 1.5-4mm/s.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100861743A CN101574761B (en) | 2009-06-12 | 2009-06-12 | Powder-cored welding wire used for surface cladding of high-temperature thermocouple protection tube and preparation method thereof |
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|---|---|---|---|
| CN2009100861743A CN101574761B (en) | 2009-06-12 | 2009-06-12 | Powder-cored welding wire used for surface cladding of high-temperature thermocouple protection tube and preparation method thereof |
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| CN102026467B (en) * | 2010-12-03 | 2012-08-29 | 华北电力大学 | Silver-hafnium alloy material for DC arc air plasma torch cathode and preparation method thereof |
| CN102151960B (en) * | 2010-12-31 | 2016-02-10 | 陕西国德电气制造有限公司 | A kind of Al-alloy casing inside weld automatic TIG remelting forming method |
| CN104174964A (en) * | 2014-08-20 | 2014-12-03 | 沧州格锐特钻头有限公司 | Twice hardening method for surface of steel drill bit |
| CN104848953A (en) * | 2015-04-16 | 2015-08-19 | 派罗特克（深圳）高温材料有限公司 | Pipe plugging bulkhead thermocouple protective sleeve and processing method |
| CN105384440B (en) * | 2015-12-18 | 2018-07-17 | 重庆材料研究院有限公司 | Prepare the material and method of molybdenum disilicide protection pipe |
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| CN1338352A (en) * | 2001-10-12 | 2002-03-06 | 安泰科技股份有限公司 | Flux-cored welding wire for downward vertically |
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| CN101113520A (en) * | 2007-08-24 | 2008-01-30 | 李粤 | Cladding device based on argon-arc welding |
| CN101195126A (en) * | 2007-12-26 | 2008-06-11 | 华北电力大学 | Ceramic-metallic composite cladding layer top head for tube inserting machine and method for producing the same |
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2009
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1405355A (en) * | 2001-08-04 | 2003-03-26 | 山东科技大学机械电子工程学院 | Method for depositing paint-coat of metal surface, especially for gradient paint-coat |
| CN1338352A (en) * | 2001-10-12 | 2002-03-06 | 安泰科技股份有限公司 | Flux-cored welding wire for downward vertically |
| CN101113520A (en) * | 2007-08-24 | 2008-01-30 | 李粤 | Cladding device based on argon-arc welding |
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Non-Patent Citations (1)
| Title |
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| JP特开平8-174271A 1996.07.09 |
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