CN103374693A - Nano thermal barrier coating on surface of high-temperature furnace roller and preparation method thereof - Google Patents
Nano thermal barrier coating on surface of high-temperature furnace roller and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a nano thermal barrier coating on the surface of a high-temperature furnace roller and a preparation method thereof, namely, the coating comprises a CoNiCrAlY bonding layer and a nano-ZrO2 nano ceramic operating layer, wherein 6-8% of Y2O3 is added in the nano-ZrO2 nano ceramic operating layer, the powder particle size of the bonding layer is 20-45mu m, the original particle size of nano ZrO2 is 50-100nm, and after the Y2O3 is added in the nano ZrO2, the secondary granulation is performed on the obtained mixture, the particle size of a obtained product is 45-106mu m. The preparation method comprises the following steps: firstly, cleaning the furnace roller, preheating, drying, and carrying out sandblasting treatment on the furnace roller by using an automatic sandblasting machine; then, preparing a middle bonding layer and a nano ceramic operating layer by using a plasma spraying device according to certain process requirements; finally, carrying out hole sealing on the surface of the nano ceramic operating layer through coating by using a hole sealing agent. According to the thermal barrier coating and the preparation method thereof disclosed by the invention, the oxidation resistance, wear resistance, corrosion resistance and scaffolding resistance of the high-temperature furnace roller are effectively enhanced, the service life of the high-temperature furnace roller is prolonged, and the replacement cost and the maintenance cost of the high-temperature furnace roller are reduced.
Description
Technical field
The present invention relates to nanostructured thermal barrier coating and the preparation method on a kind of high-temperature furnace roller surface.
Background technology
In steel industry, continuous furnace is the heat treated visual plants of steel, furnace bottom roll is the key part of roller bottom type continuous furnace, this furnace bottom roll is high-temperature furnace roller, it bears the erosion of high temperature oxidation, combustion gas and various media and steel heavy duty, bump, friction etc. for a long time, and Working environment is very abominable.The high chromium nickel heat-resistance stainless steel of high-temperature furnace roller normal operation material adopts the centrifugal casting technique preparation at present, involves great expense.But in severe environment, the furnace roller life-span is low, and the annual expense that is used for replacing furnace roller and maintenance is huge, and the aspect such as therefore reduce the furnace roller manufacturing cost how, increase the service life is generally paid much attention to.
The reason that causes high-temperature furnace roller to damage mainly contains: the sulfide in high temperature oxidation and the high-temperature fuel gas etc. are corrosional to be peeled off or the wearing and tearing of pitting corrosion, surface cord, thermal treatment steel pair roller face etc.Therefore, raising furnace roller key in work-ing life is to improve anti-oxidant, heat-resisting, anti-corrosion, wear-resisting, the anti-nodulation ability under the furnace roller condition of high temperature.The potentiality that improve the furnace roller use properties by material improvement are little, and can effectively improve the furnace roller performance by surface strengthening, increase the service life, and wherein hot-spraying techniques is the most frequently used, the most effective surface strengthening means.
Now with hot-spraying techniques high-temperature furnace roller is carried out surface strengthening and mainly contain two kinds: a kind of is flame plating high alloy refractory coating, and another kind is plasma spraying conventional ceramic protective layer.Two kinds of methods can both improve the high-temperature furnace roller performance to a certain extent, increase the service life, but all come with some shortcomings.Flame plating high alloy refractory coating, coating and furnace roller base material bonding strength are high, and shock resistance is good, but the high temperature over-all properties such as heat-resisting, wear-resisting, anti-corrosion has certain limitation; The plasma sprayed ceramic protective layer, coating is heat-resisting, wear-resisting, corrosion resisting property is good, but relatively poor with furnace roller base material bonding strength, thermal expansivity is less, in the use easily cracking, peel off etc.
Application publication number is that the application for a patent for invention of CN 102094164 A has provided " a kind of nanometer zirconia heat barrier coating and preparation method ", namely adopts hypersonic flame spraying to combine with plasma spraying, prepares NiCrAlY tack coat and nanometer ZrO in the metallic surface
2The pottery working lining, coating and metallic matrix bonding strength are higher, and thermal shock resistance and heat-proof quality all are better than common ZrO
2Thermal barrier coating.But because the nanostructured thermal barrier coating of preparation exists certain hole and tiny crack, if do not carry out any aftertreatment, process such as sealing of hole, in hot environment, easily cause burn into oxidation etc., cause coating dross, spalling failure; And the method that adopts hypersonic flame spraying to combine with plasma spraying requires to possess simultaneously two kinds of equipment in same spray painting room, and operation is loaded down with trivial details, is unfavorable for suitability for industrialized production.
Summary of the invention
Technical problem to be solved by this invention provides nanostructured thermal barrier coating and the preparation method on a kind of high-temperature furnace roller surface, this thermal barrier coating and preparation method have effectively strengthened anti-oxidant, wear-resisting, anti-corrosion, the anti-nodulation ability of high-temperature furnace roller, prolong the work-ing life of high-temperature furnace roller, reduced the cost that high-temperature furnace roller is changed and safeguarded.
For solving the problems of the technologies described above, the nanostructured thermal barrier coating on high-temperature furnace roller of the present invention surface comprises intermediate adhesive layer and nano ceramics working lining, described intermediate adhesive layer is to be the coating of the powder preparation of CoNiCrAlY by composition, wherein Ni30-35%, Cr20-25%, Al5-10%, Y0.4-0.7%, Co surplus, powder diameter is 20-45 μ m, and described nano ceramics working lining is that initial size is the nanometer ZrO of 50-100nm
2Coating wherein adds the Y of 6-8%
2O
3And through secondary granulation, the grain graininess size is 45-106 μ m after the granulation, and above-mentioned percentage composition is weight percentage.
The preparation method of the nanostructured thermal barrier coating on above-mentioned high-temperature furnace roller surface comprises the steps:
Step 1, high-temperature furnace roller substrate pretreated, high chromium nickel heat-resistance stainless steel furnace roller surface cleaning is clean, be preheated to 90-110 ℃ and carry out drying, adopt automatic sand-blasting machine to carry out sandblasting, sand-blast material is the 46# white fused alumina, angle of gun 90 ± 5o, air pressure 6kg/cm
2, spray gun is to furnace roller surface distance 450-550mm, furnace roller surface sand-blasting rear surface roughness Ra 5-7 μ m;
The CoNiCrAlY powder of step 2, intermediate adhesive layer is in 120-150 ℃ of preheating 90-120min, adopt plasma spraying equipment to prepare intermediate adhesive layer, spraying parameter is powder feeding rate 25-35g/min, electric current 600-700A, main atmospheric pressure 45-50NLPM, auxiliary atmospheric pressure 12-15NLPM, powder feeding gas pressure 2-2.5NLPM, spray distance 100-130mm, coat-thickness 0.06-0.10mm;
Step 3, with the nanometer ZrO of preparation work layer
2Powder is in 120-150 ℃ of preheating 90-120min, adopt plasma spraying equipment to prepare the nano ceramics working lining, spraying parameter is powder feeding rate 40-50g/min, electric current 600-700A, main atmospheric pressure 35-45NLPM, auxiliary atmospheric pressure 10-12NLPM, powder feeding gas pressure 2.5-3NLPM, spray distance 100-130mm, coat-thickness 0.15-0.20mm;
Step 4, employing hole sealing agent apply sealing of hole to nano ceramics working lining surface, hole sealing agent can adopt chromate aqueous solution, the high-temperature furnace roller that is coated with the nano ceramics working lining is preheating to 85 ℃-95 ℃, adopts the brushing mode to carry out coating processing, subsequently ambient cure 30min.
Because nanostructured thermal barrier coating and the preparation method on high-temperature furnace roller of the present invention surface have adopted technique scheme, namely coating is the CoNiCrAlY tack coat and wherein adds 6-8%Y
2O
3Nanometer ZrO
2Nano ceramics working lining, the powder diameter of tack coat are 20-45 μ m, nanometer ZrO
2Initial size be 50-100nm, add Y
2O
3By secondary granulation, globule size is 45-106 μ m; Its preparation method is at first cleaning oven rod and preheating and drying, adopts automatic sand-blasting machine to carry out sandblasting; Then adopt plasma spraying equipment to prepare intermediate adhesive layer and nano ceramics working lining by certain processing requirement, adopt at last hole sealing agent that nano ceramics working lining surface is applied sealing of hole.This thermal barrier coating and preparation method have effectively strengthened anti-oxidant, wear-resisting, anti-corrosion, the anti-nodulation ability of high-temperature furnace roller, prolong the work-ing life of high-temperature furnace roller, have reduced the cost that high-temperature furnace roller is changed and safeguarded.
Embodiment
The nanostructured thermal barrier coating on high-temperature furnace roller of the present invention surface comprises intermediate adhesive layer and nano ceramics working lining, described intermediate adhesive layer is that composition is the powder coating of CoNiCrAlY, wherein Ni32%, Cr21%, Al8%, Y0.5%, Co surplus, powder diameter is 20-45 μ m, and described nano ceramics working lining is that initial size is the nanometer ZrO of 50-100nm
2Coating wherein adds 8% Y
2O
3And through secondary granulation, the grain graininess size is 45-106 μ m after the granulation, and above-mentioned percentage composition is weight percentage.
The preparation method of the nanostructured thermal barrier coating on above-mentioned high-temperature furnace roller surface comprises the steps:
Step 1, high-temperature furnace roller substrate pretreated, high chromium nickel heat-resistance stainless steel furnace roller surface cleaning is clean, be preheated to 100 ℃ and carry out drying, adopt automatic sand-blasting machine to carry out sandblasting, sand-blast material is the 46# white fused alumina, angle of gun 90o, air pressure 6kg/cm
2, spray gun is to furnace roller surface distance 500mm, furnace roller surface sand-blasting rear surface roughness Ra 5-7 μ m;
The CoNiCrAlY powder of step 2, intermediate adhesive layer is in 120 ℃ of preheating 120min, adopt plasma spraying equipment to prepare intermediate adhesive layer, spraying parameter is powder feeding rate 25g/min, electric current 600A, main atmospheric pressure 50NLPM, auxiliary atmospheric pressure 13NLPM, powder feeding gas pressure 2NLPM, spray distance 110mm, coat-thickness 0.08mm;
Step 3, with the nanometer ZrO of preparation work layer
2Powder is in 120 ℃ of preheating 120min, adopt plasma spraying equipment to prepare the nano ceramics working lining, spraying parameter is powder feeding rate 45g/min, electric current 650A, main atmospheric pressure 45NLPM, auxiliary atmospheric pressure 12NLPM, powder feeding gas pressure 2.5NLPM, spray distance 110mm, coat-thickness 0.15mm;
Step 4, because the operating mode of high-temperature furnace roller operating mode and aviation, naval vessel internal combustion turbine is completely different, and high-temperature furnace roller not only bears high temperature oxidation for a long time, but also bear for a long time the corrosion of various media and steel heavy duty, bump, friction etc., operating mode is more abominable; Therefore adopt hole sealing agent that the nano ceramics working lining surface of High Temperature Furnaces Heating Apparatus rod is applied sealing of hole.Owing to have hole and the tiny crack of some amount in the nano ceramics working lining, corrosive medium can be delivered to intermediate adhesive layer and nano ceramics working lining interface by hole and tiny crack, even arrival stove rod matrix surface, and cause burn into oxidation etc., cause disbonding, therefore the nano ceramics working lining is carried out sealing of hole and process, improve the performances such as anti-oxidant, anti-thermal shock of nano ceramics working lining, further prolong high-temperature furnace roller work-ing life.Above-mentioned hole sealing agent can adopt chromate aqueous solution, and the high-temperature furnace roller that is coated with nano ceramic coat is preheating to 90 ℃, adopts the brushing mode to carry out coating processing, subsequently ambient cure 30min.
The new type high temperature furnace roller that the present invention relates to, adopt plasma spraying CoNiCrAlY intermediate adhesive layer and nano ceramics working lining to carry out the surface strengthening of stove rod, the spraying of this preparation method ionic medium can adopt Unicoat F4 plasma spraying equipment to implement the coating spraying operation, need not multiple spraying equipment, simplify the spraying operation operation, improved the efficient of spraying operation; The CoNiCrAlY intermediate adhesive layer improves the bonding strength of coating and stove rod base material, dwindles the expansion coefficient difference of stove rod base material and nano ceramics working lining; The nano ceramics working lining adopts nanostructure Y
2O
3Powder is cooked the feeding agent, shorten the particles fuse time, at limited plasma-spray powder in the flight time, nano particle fusing better effects if, the nano coating porosity of preparation is less, and compactness improves, have better anticorrosive, resistance to wear, resistive connection knurl performance, so that prolong the work-ing life of high-temperature furnace roller more than one times, reduce the blowing out probability, reduced the cost that high-temperature furnace roller is changed and safeguarded.Nanometer ZrO in the nano ceramics working lining
2Have better stability, especially under greater than 1000 ℃ high temperature, have more obvious oxidation-resistance, heat-shock resistance, resistive connection knurl performance, can improve strip surface quality.While nanometer ZrO
2Thermal conductivity is than common ZrO
2Low, have better heat-proof quality, can greatly reduce the heat that water coolant is taken away, save energy; The furnace roller roller core can keep lower temperature, has improved roller core intensity, is difficult for deformed damaged.
Claims (3)
1. the nanostructured thermal barrier coating on a high-temperature furnace roller surface, it is characterized in that: this nanostructured thermal barrier coating comprises intermediate adhesive layer and nano ceramics working lining, described intermediate adhesive layer is to be the coating of the powder preparation of CoNiCrAlY by composition, wherein Ni30-35%, Cr20-25%, Al5-10%, Y0.4-0.7%, Co surplus, powder diameter is 20-45 μ m, and described nano ceramics working lining is that initial size is the nanometer ZrO of 50-100nm
2Coating wherein adds the Y of 6-8%
2O
3And through secondary granulation, the grain graininess size is 45-106 μ m after the granulation, and above-mentioned percentage composition is weight percentage.
2. the preparation method of the nanostructured thermal barrier coating on described high-temperature furnace roller surface according to claim 1 is characterized in that present method comprises the steps:
Step 1, high-temperature furnace roller substrate pretreated, high chromium nickel heat-resistance stainless steel furnace roller surface cleaning is clean, be preheated to 90-110 ℃ and carry out drying, adopt automatic sand-blasting machine to carry out sandblasting, sand-blast material is the 46# white fused alumina, angle of gun 90 ± 5o, air pressure 6kg/cm
2, spray gun is to furnace roller surface distance 450-550mm, furnace roller surface sand-blasting rear surface roughness Ra 5-7 μ m;
The CoNiCrAlY powder of step 2, intermediate adhesive layer is in 120-150 ℃ of preheating 90-120min, adopt plasma spraying equipment to prepare intermediate adhesive layer, spraying parameter is powder feeding rate 25-35g/min, electric current 600-700A, main atmospheric pressure 45-50NLPM, auxiliary atmospheric pressure 12-15NLPM, powder feeding gas pressure 2-2.5NLPM, spray distance 100-130mm, coat-thickness 0.06-0.10mm;
Step 3, with the nanometer ZrO of preparation work layer
2Powder is in 120-150 ℃ of preheating 90-120min, adopt plasma spraying equipment to prepare the nano ceramics working lining, spraying parameter is powder feeding rate 40-50g/min, electric current 600-700A, main atmospheric pressure 35-45NLPM, auxiliary atmospheric pressure 10-12NLPM, powder feeding gas pressure 2.5-3NLPM, spray distance 100-130mm, coat-thickness 0.15-0.20mm;
Step 4, employing hole sealing agent apply sealing of hole to nano ceramics working lining surface, and the high-temperature furnace roller that is coated with the nano ceramics working lining is preheating to 85 ℃-95 ℃, adopt the brushing mode to carry out coating processing, subsequently ambient cure 30min.
3. the preparation method of the nanostructured thermal barrier coating on high-temperature furnace roller according to claim 2 surface, it is characterized in that: described hole sealing agent is chromate aqueous solution, wherein chromic anhydride content is 20-30mg/L.
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