CN1146477C - Process for preparing high-temp protecting layer on surface of metal - Google Patents
Process for preparing high-temp protecting layer on surface of metal Download PDFInfo
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- CN1146477C CN1146477C CNB011141476A CN01114147A CN1146477C CN 1146477 C CN1146477 C CN 1146477C CN B011141476 A CNB011141476 A CN B011141476A CN 01114147 A CN01114147 A CN 01114147A CN 1146477 C CN1146477 C CN 1146477C
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Abstract
The present invention relates to a method for processing high temperature protective coating layers on the surfaces of metal. In the method, raw materials of high temperature protective coating layers comprise the following main components: inorganic oxide frit, chromium oxide, clay, etc. which are all fine selected and prepared; coating layer drying is carried out after slurry spraying for obtaining optimal protective properties; sintering is carried out at lower temperature of 1140 to 1160 DEG C for little influencing on the properties of basal bodies for not only causing crystal grains of the basal bodies not to grow up, but also causing component parts not to deform; the materials have good adhesive force, form smooth surfaces for enhancing binding strength, have low heat conduction coefficient and have obvious heat insulation effects for reducing heat stress and deformation bore by metal; therefore, the method effectively solves the problem of lump drop and crack of coating layers, unmatched basal body and coating layer, etc. existing for many years, can satisfy the use requirements of engines and can enhance the service life of engines.
Description
The present invention relates to a kind of process for preparing high-temp protecting layer on surface of metal that is applicable to piece surfaces such as being coated in heat-resisting alloy and stainless steel.
As everyone knows, the distinguishing feature that develops because of aero-jet engine is that thrust increases, turbine inlet temperature improves, delivery temperature rises, prolong service life, so the service condition that causes the numbers of hot-side engine parts is more and more harsher, and obviously can not bear up the condition of high temperature fully, therefore cover the measure that one deck antioxidant defense coating necessitates at piece surface as the metal material of constitutional detail.High-temperature protection coating is applicable to and is coated on heat-resisting alloy and the stainless piece surface, is used for protecting metal.Coating better chemical stability is a kind of anti-oxidation effective barrier commonly used to the part of contact combustion gas.Be the main space that engine produces combustion gas for the combustion chamber, therefore must bear in the combustion process, also will bear the vibration of combustion gas and wash away the heat erosion of part wall thickness.Belt combustion chamber inside and outside wall material as available engine is high temperature alloy, its heat treatment temperature is all below 1150 ℃, the coating of this former employing in combustion chamber, mainly form by inorganic oxide, its good bonding strength, the serviceability temperature height with regard to coating itself, can satisfy the instructions for use of this machine combustion chamber, but its ignition temperature is higher, be 1180 ± 10 ℃, the sintering temperature of coating has obviously surpassed the maximum heat treatment temperature of matrix material like this, and is influential to substrate performance, sintering time is long in addition, material grains is grown up, and, also can cause the matrix distortion at too high sintering temperature.Exist coating to fall problems such as piece, crackle and matrix and coating do not match for many years, therefore, it is good to develop a kind of result of use, is necessary to the little high-temperature protection coating of substrate performance influence.
The purpose of this invention is to provide a kind of process for preparing high-temp protecting layer on surface of metal, its technology is easy, stable, and is little to the substrate performance influence, environmentally safe, coating performance is reliable, material adhesive force is good, and the bond strength height does not have and to peel off and fall the piece phenomenon, its heat conduction yarn number is low, play tangible effect of heat insulation, can satisfy the instructions for use of engine, improve the service life of engine.
The object of the present invention is achieved like this: this method operating procedure is as follows:
One, coating slip preparation: earlier by weight be frit: chrome green: clay: water=30-40: 10-20: 1-5: 30-40, take by weighing raw material preparation coating slip, grind then, cross 270 mesh sieves, old at least seven days of slip is standby behind the sieve;
Two, coating coating processes: A, clean metal surface are carried out surface coarsening to it again and are handled,
B, evenly apply the slip that stirs pre-in the metal surface with spray gun
Decide the coating of thickness,
Drying is no less than 15 minutes under C, the coating room temperature, at temperature 40-50 ℃
Following drying is no less than 30 minutes,
Three, coating sintering: dried coating is advanced the stove sintering under 1140-1160 ℃, reach predetermined temperature after, be incubated the cooling of coming out of the stove in 3-5 minute.
Above-mentioned frit is silica by weight by following raw materials according: barium monoxide: zinc oxide: calcium oxide: molybdenum oxide: magnesia: aluminium oxide: boron oxide=38-46: 37-47: 4.5-5.5: 3.5-4.5: 2.3-3.5: 0.5-1.5: 0.2-1.0: 0.5-1.5 takes by weighing; put into stove after pulverizing mixing; under 1380-1400 ℃, fused 1.5-2 hour; the glass fusion carries out pelletization and gets frit in cold water, it is standby in 150-200 ℃ time dry 2-4 hour.
Because the coating that processing method of the present invention obtains has smooth surface, low thermal conductivity factor, play tangible effect of heat insulation, thereby reduce thermal stress and distortion that metal bore, this high-temperature protection coating not only will have better chemical stability, provides anti-oxidation effective barrier to the part that contacts combustion gas, but also will have and matrix bond favorable manufacturability energy, so the condition harshness, therefore selection and the coating processes to the high-temperature protection coating raw material all has strict requirement.The Main Ingredients and Appearance inorganic oxide glass material of high-temperature protection coating raw material, chrome green, clay etc. are all through selecting meticulously and preparing..Carry out the coating drying after the slip spraying, in order to obtain the optimized protection performance, sintering under lower temperature 1140-1160 ℃ condition, little to the substrate performance influence, the crystal grain of matrix is neither grown up, make part indeformable again, material adhesive force is good, forms smooth surface, improves bond strength.Its heat conduction yarn number is low, has tangible effect of heat insulation, thereby reduces thermal stress and distortion that metal bore.Therefore, this method has solved the coating that exists for many years effectively and has fallen problems such as piece, crackle and matrix and coating do not match, and has avoided the harmful effect of high temperature protection to the matrix material performance.
By research repeatedly, aspect the composition of coating, the coating processes and the performance of coating carried out comprehensive test, the result proves that its technology is easy, stable, environmentally safe, coating performance is reliable, and anticorrosion, anti-oxidation protective effect are arranged.Can satisfy the instructions for use of engine, improve the service life of engine.
This coating can be used for aerial motor spare part, also can be used for the parts of other products.Be the main space that engine produces combustion gas for the combustion chamber, must bear in the combustion process, also will bear the vibration of combustion gas and wash away the heat erosion of part wall thickness.Therefore the combustion chamber flame drum of engine try out, and has been passed through 150 hours bench test drives, the test of taking a flight test by 300 hours cyclic fatigues again all obtains the result of use of being satisfied with subsequently.Therefore, the present invention very easily applies.
The invention will be further described below in conjunction with embodiment.
High-temperature protection coating raw material of the present invention is through selecting meticulously and preparing, and the raw material Main Ingredients and Appearance is made up of inorganic oxide glass material, chrome green, clay.Wherein:
1, frit is formed:
Above-mentioned frit is silica by weight by following raw materials according: barium monoxide: zinc oxide: calcium oxide: molybdenum oxide: magnesia: aluminium oxide: boron oxide=38-46: 37-47: 4.5-5.5: 3.5-4.5: 2.3-3.5: 0.5-1.5: 0.2-1.0: 0.5-1.5 takes by weighing; put into stove after pulverizing mixing; under 1380-1400 ℃, founded 1.5-2 hour; the glass fusion carries out pelletization and gets frit in cold water, with its in 150-200 ℃ down dried make an uproar 2-4 hour standby.
In the above-mentioned raw materials:
Silica (SiO
2): silica mainly plays the fusing point of raising glass and the sintering temperature of enamel in glass, improve the hear resistance of coating, plays skeleton function in coating.
Barium monoxide (BaO): barium monoxide plays solvent action in coating, reduces fusion temperature, increases the gloss of coating.
Zinc oxide (ZnO): zinc oxide improves the chemical stability of coating, reduces the coefficient of expansion, plays the flux effect.
Calcium oxide (CaO): calcium oxide promotes glass to melt, and plays the flux effect, increases chemical stability and mechanical strength.
Molybdenum oxide (Mo
2O
3): molybdenum oxide improves the wetability of coating, improves adhesive force of coatings.
Boron oxide (B
2O
3): boron oxide reduces fusing point, improves adhesive force of coatings, and a small amount of adding can improve chemical stability.
Magnesia (MgO): magnesia can be accelerated glassy phase and form, and can improve chemical stability.
Aluminium oxide (AL
2O
3): aluminium oxide improves the hear resistance of coating, increases mechanical strength.
2, the configuration of frit:
Each component in the frit should be dried earlier, is placed on after quantity is weighed in accordance with regulations in the porcelain cylinder on the roll mill, shakes and mixes 4～5 hours, and the batching after stirring is put into heat-resisting clay pot, puts into stove then.Batching is founded under 1380～1400 ℃, keeps under this temperature 1.5～2 hours, and the glass fusion carries out pelletization in cold water.The frit that melting is obtained was in 150～200 ℃ of dryings 2～4 hours, and is standby in the bottle of the cleaning of packing into.
3, the configuration of chrome green:
Chromic anhydride (content is greater than 99.5%) is put into ceramic, deliver in the cabinet-type electric furnace of ventilation and slowly be heated to 200 ℃, when freely being warming up to 500 ℃, be incubated 1～2 hour, be warming up to 900 ℃ of insulations 3～4 hours again, in air, be cooled to room temperature then, take out chrome green, remove foul, clean more than five times with running water then.The chrome green that draws through above-mentioned operation is a bottle green, PH 〉=5.8, and the chrome green after the washing is 80～200 ℃ of oven dry down.The chrome green that makes puts into vial or porcelain enamel barrel is standby.
4, clay:
Adopt Suzhou to produce a trumpeter and select clay
Embodiment one:
The concrete operations step that is coated with high-temperature protection coating on aero-engine toroidal combustion chamber burner inner liner is as follows:
One, coating material oar preparation:
1, the proportioning of slip
Claim 35 parts of frits by weight, 15 parts of chrome greens, the running water of 2.5 parts of clays in Suzhou and 35 parts is poured in the porcelain tube, adds the porcelain ball of diameter 25～40mm, and the weight of porcelain ball is identical with frit weight.
2, ball milling
The frit for preparing is in proportion put in the porcelain tube, built the porcelain cover, be put into then and carry out ball milling on the ball mill.Ball milling finishes, and slip suspension is crossed 270 mesh sieve, requires the following particle of 10 μ should be more than 95%, and is then that suspension is old more than 7 days.
3, slip performance
Viscosity: in the time of 25 ℃, B4 cup, 12～14S.
Two, coating coating processes:
A, clean metal surface, at first organic matter or other sediments with part removes clean.Otherwise will pollute sand grains or dirt is accumulated on the part again, make the spraying slip be conglobulation, directly influence coating quality.Again it being carried out surface coarsening handles, after adopting the blast method to carry out surface coarsening processing, can cause certain roughness on the one hand, enlarged surface is long-pending, increases the adhesion of coating and matrix, also further clean surface, but also should not be thick excessively, otherwise in the service life of meeting injuring part, therefore, it is most important correctly to implement coarsening process.
Piece surface behind the blast should be the matsurface of no metallic luster, the surface evenly, no residual deposit, blackening and leakage such as blow at phenomenon.
Before the spraying with the floating ash of piece surface with blowing clean through the compressed air that filters, the part behind the blast should spray rapidly, blast generally is no more than 4 hours with the spray time interval and is advisable, if above 4 hours, blast again then.
B, coating evenly apply being coated with of predetermined thickness with spray gun with the slip that stirs in the metal surface
Layer.Spraying parameter: air pressure: 0.2～0.3Mpa, spray distance: 100～200mm, spray angle: as far as possible perpendicular to the surface that sprays part.
C, coating drying, after slip covers on the part, part should be placed on the high temperature alloy pallet reposefully, and place on the workbench or frame of free from dust environment, drying at room temperature is no less than 15 minutes, moisture in the coating is fully evaporated, because of the moisture vaporization makes coating bubble occur, influence coating quality in the time of can obviously reducing sintering.Under 40～50 ℃ of temperature, be no less than 30 minutes in making an uproar.
Three, coating sintering:
The sintering of coating is by the fine particle mixture, and by the key link of high temperature formation glassy layer (both enamel), the present invention is under lower temperature conditions, reaches to be completed into the purpose that glassy layer melts, and selected temperature is advanced the stove sintering under 1140-1160 ℃.After reaching predetermined temperature, be incubated the cooling of coming out of the stove in 3～5 minutes.
Coating layer thickness: for make coating even, smooth, be completed into glassy state, coating layer thickness can adopt spraying method twice.First pass: 0.02～0.04mm.Second time THICKNESS CONTROL is at 0.04～0.06mm.
The coating surface quality examination
1. the quality examination of appearance of coat.The measured coating surface of matter should be smooth, smooth, even, do not have defectives such as blackening, bubble, pinprick, crackle, trickling, scuffing, leakage matrix.
2. the measurement of coating layer thickness.All be with test piece during spraying, use tack miking coating layer thickness, gross thickness should be controlled at 0.03～0.08mm.
The antioxygenic property test of coating
Experimental condition: 1050 ℃ * 100 hours
Result of the test: behind 1050 ℃ * 100 hours anti-oxidant test sintering, coating all do not have peel off, phenomenon such as foaming, crackle.Facts have proved: the high-temperature protection coating antioxygenic property improves more than 4 times,
Embodiment two:
The concrete operations step that is coated with high-temperature protection coating on the gas turbine burner inner liner is as follows:
One, coating material oar preparation:
1, the proportioning of slip
Claim 30 parts of frits by weight, 20 parts of chrome greens, the running water of 5 parts of clays in Suzhou and 40 parts is poured in the porcelain tube, adds the porcelain ball of diameter 25～40mm, and the weight of porcelain ball is identical with frit weight.
2, ball milling is with embodiment one.
3, slip performance is with embodiment one.
Two, coating coating processes: with embodiment one.
Three, coating sintering: with embodiment one.
Embodiment three:
The concrete operations step that is coated with high-temperature protection coating on the aeroengine thrust augmentation stabilizer is as follows:
One, coating material oar preparation:
1, the proportioning of slip
Claim 40 parts of frits by weight, 10 parts of chrome greens, the running water of 1 part of clay in Suzhou and 30 parts is poured in the porcelain tube, adds the porcelain ball of diameter 25～40mm, and the weight of porcelain ball is identical with frit weight.
2, ball milling is with embodiment one.
3, slip performance is with embodiment one.
Two, coating coating processes: with embodiment one.
Three, coating sintering: with embodiment one.
Claims (1)
1, a kind of process for preparing high-temp protecting layer on surface of metal is characterized in that operating procedure is as follows:
One, coating slip preparation: earlier by weight be frit: chrome green: clay: water=30-40: 10-20: 1-5: 30-40, take by weighing raw material preparation coating slip, grind then, cross 270 mesh sieves, old at least seven days of slip is standby behind the sieve;
Two, coating coating processes: A, clean metal surface are carried out surface coarsening to it again and are handled,
B, evenly apply the slip that stirs pre-in the metal surface with spray gun
Decide the coating of thickness,
Drying is no less than 15 minutes under C, the coating room temperature, at temperature 40-50 ℃
Following drying is no less than 30 minutes,
Three, coating sintering: dried coating is advanced the stove sintering under 1140-1160 ℃, reach predetermined temperature after, be incubated the cooling of coming out of the stove in 3-5 minute;
Above-mentioned frit is silica by weight by following raw materials according: barium monoxide: zinc oxide: calcium oxide: molybdenum oxide: magnesia: aluminium oxide: boron oxide=38-46: 37-47: 4.5-5.5: 3.5-4.5: 2.3-3.5: 0.5-1.5: 0.2-1.0: 0.5-1.5 takes by weighing; put into stove after pulverizing mixing; under 1380-1400 ℃, founded 1.5-2 hour; the glass fusion carries out pelletization and gets frit in cold water, it is standby in 150-200 ℃ time dry 2-4 hour.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011141476A CN1146477C (en) | 2001-06-29 | 2001-06-29 | Process for preparing high-temp protecting layer on surface of metal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011141476A CN1146477C (en) | 2001-06-29 | 2001-06-29 | Process for preparing high-temp protecting layer on surface of metal |
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|---|---|
| CN1327885A CN1327885A (en) | 2001-12-26 |
| CN1146477C true CN1146477C (en) | 2004-04-21 |
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| CNB011141476A Expired - Fee Related CN1146477C (en) | 2001-06-29 | 2001-06-29 | Process for preparing high-temp protecting layer on surface of metal |
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| CN108610680B (en) * | 2018-05-23 | 2020-06-30 | 兆山科技（北京）有限公司 | High-temperature chlorine corrosion resistant coating and preparation method thereof |
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