CN106634559A - Al2O3-MgO-SiAlON common steel heat treatment anti-oxidation coating and use method thereof - Google Patents
Al2O3-MgO-SiAlON common steel heat treatment anti-oxidation coating and use method thereof Download PDFInfo
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Abstract
The invention discloses an Al2O3-MgO-SiAlON common steel heat treatment anti-oxidation coating and a use method thereof. The coating comprises, by weight, 30-50 parts of Al2O3-MgO-SiAlON powder, 3-5 parts of Cr2O3, 20-30 parts of compound binders, 0.5-1.5 parts of potassium fluoborate and 0.5-1.5 parts of boron carbide. The Al2O3-MgO-SiAlON powder serves as a filler of the coating, high-temperature resistance and chemical stability of the coating are improved, high-temperature stability and viscosity of the compound binders prepared from phthalocyanine resin prepolymer are enhanced, the coating does not easily crack or fall off, and high-temperature oxidation resistance of the coating is enhanced. The coating can be sprayed or brushed on the surface of a steel billet at the temperature ranging from room temperature to 500 DEG C, the coating can naturally fall off in the cooling process after hot processing, and phosphorus removal difficulty is reduced.
Description
Technical field
The present invention relates to technical field of coatings, and in particular to a kind of Al2O3- MgO-SiAlON is common, and steel heat treatment is anti-oxidant
Coating and its using method.
Background technology
In existing steel rolling process, either ordinary steel or special steel, in rolling, forging, quenching, annealing, normalizing etc.
During heat treatment process, surface oxidation phenomenon is easily produced under high temperature action, but also alloying element dilution can be accompanied by
And decarburization.This phenomenon directly governs the raising of Rolling Yield, have impact on the surface quality of finished steel.Steel is prevented at present
The method of ironwork oxidization burning loss has high temperature coating method, vacuum method and protective atmosphere method.Vacuum method and protective atmosphere method are by steel
Ironwork is placed under vacuum environment or inert gas shielding environment and is heated, and reduces high-temperature furnace gas and steel product surface
Contact, so as to reduce the oxidative damage of steel product.But both approaches complex process, operating technology has high demands, and is not suitable for steel
Ironwork high-volume heat treatment process.High temperature coating method is a kind of heat treatment resist technology that recent decades grow up, relatively
Vacuum method and protective atmosphere method process technology, this guard method has small investment, low cost, simple to operate, strong adaptability etc.
Feature.The general principle of coating technology is that coating is coated on into billet surface, in progressively heating process, forms one layer and tightly invests
The higher dense sintering layer of billet surface and intensity, the sinter layer is inert to billet surface oxide, so as to prevent steel billet because
Directly contact and the steel bonding problem that produces, while dense sintering layer has completely cut off oxidizing atmosphere, effectively reduce billet oxidization burning
Damage.
China Patent Publication No. 1036396A discloses a kind of blank plates of silicon steels heating antioxidizing paint, and this kind of coating is with common
Magnesia or useless magnesia brick powder and electric capacity magnesia are major ingredient, and light clay silicate frit and industrial chrome green are auxiliary material, with trimerization
Sodium phosphate and Sodium Polyacrylate are made up of additive.The coating uses magnesium chromium matter coating, although with certain anti-liquid
The ability that silicon steel corrodes, but its adhesive property is poor, causes the coating easily to ftracture and come off after being heated, in addition tripolyphosphate
Sodium and Sodium Polyacrylate chemical stability at high temperature is also relatively poor, causes the coating oxidation-protective effect not to be to manage very much
Think.
The content of the invention
It is an object of the invention to overcome existing ordinary steel anti-oxidation coating for heat treatment poor chemical stability, easy to crack come off
Problem, there is provided a kind of Al with good heat-resisting quantity and caking property2O3The anti-oxidant painting of the common steel heat treatments of-MgO-SiAlON
Material.
Present invention also offers a kind of Al2O3The using method of-MgO-SiAlON ordinary steel anti-oxidation coating for heat treatment.
The present invention concrete technical scheme be：A kind of Al2O3- MgO-SiAlON ordinary steel anti-oxidation coating for heat treatment, by with
The raw material composition of lower weight portion：Al2O330～50 parts of-MgO-SiAlON powders, Cr2O33～5 parts, compound binding agent 20～30
Part, 0.5～1.5 part of potassium fluoborate, 0.5～1.5 part of boron carbide, above each component granularity is 300～500 mesh.
Al2O3It is excellent that-MgO-SiAlON materials have fusing point height, thermal conductivity factor height, low thermal expansion, chemical stability good etc.
Benign energy, the present invention adopts Al2O3- MgO-SiAlON materials are used as Al2O3The anti-oxidant painting of the common steel heat treatments of-MgO-SiAlON
The filler of material, substantially increases Al2O3The heat-resisting quantity and chemically stable of-MgO-SiAlON ordinary steel anti-oxidation coating for heat treatment
Property.Cr2O3The paintability of coating can be improved, increase coating wettability at high temperature, form fine and close anti-oxidant painting
Layer.Potassium fluoborate is low-melting compound, plays a part of to flux in the coating, increases the wettability of coating melt.Boron carbide
Activity C atoms are provided at high temperature, the anti-decarburization capacity of matrix can be strengthened.
Preferably, Al2O3- MgO-SiAlON powders are prepared by following methods：
(1) weight portion is respectively into 20～30 parts of corundum, 14～20 parts of MgO powder, 10～20 parts of sharp metals and stones and 6～12 parts of β-
The base-material that SiAlON powder is well mixed, in being placed in ball grinder, with absolute ethyl alcohol as medium 3～5h of ball milling；
(2) compound after ball milling in step (1) is dried at 50～80 DEG C, then dry-mixed 30～40min again；
(3) compound after will be dry-mixed is compressing with the pressure of 50～60MPa, 150～180 DEG C of 4～6h of baking of first Jing, then puts
In microwave high temperature atmosphere stove, it is incubated after 3～5h in 1400～1500 DEG C under conditions of buried charcoal, natural cooling obtains final product Al2O3-
MgO-SiAlON powders.
The present invention prepares Al using heating using microwave synthesis, sintering2O3- MgO-SiAlON powders, with reduce sintering temperature,
Shorten the advantage of sintered heat insulating time.
Preferably, base-material and the mass ratio of absolute ethyl alcohol are 1.5～2: 1 in step (1).The concentration of compound is suitable
In the range of, mixture is easier to crush, and more preferably, crushing is evenly for its mobility and dispersiveness.
Preferably, the preparation method of compound binding agent is as follows：
Weight portion is respectively into 60～80 parts of phthalocyanine resin prepolymers, 20～30 parts of fillers, 1～3 part of dimethylbenzene, 1～3 part of three second
TMOS is well mixed, and is heated to 150～250 DEG C, is incubated 2～5h, then is warming up to 250～350 DEG C, is incubated 4～10h, then
350～450 DEG C are warming up to, 4～10h is incubated, compound binding agent is obtained final product after natural cooling.
Binding agent can preferentially form at high temperature liquid phase viscid membrane, become the bonded bridge of coating refractory, make coating shape
Into fine and close complex phase film.Phthalocyanine resin is a kind of resin of new structure, steady with excellent thermo oxidative stability and chemistry
Qualitative, the present invention prepares compound binding agent using phthalocyanine resin prepolymer, improves binding agent stability at high temperature and glues
Property, makes that coating is not easy to crack to come off, and enhances coating oxidation-resistance property.Dimethylbenzene can improve the permeability of resin, 3-
Aminopropyltriethoxywerene werene can improve wetability and dispersiveness of the filler in resin.
Preferably, preparing one or more of the filler of compound binding agent in silicon powder, boron carbide, montmorillonite.
Preferably, phthalocyanine resin prepolymer is prepared by following steps：
(1) the addition 0.4mol 4- nitro phthalic nitriles in the there-necked flask of 500mL, 0.2mol 4,4- dihydroxybiphenyls,
0.44mol Anhydrous potassium carbonates and 200mL DMFs, reaction system is heated, and control temperature is 80～90
DEG C, react 5h；
(2) after completion of the reaction, reactant liquor is poured slowly into the hydrochloric acid solution that pH is 4 and is precipitated, sediment is filtered repeatedly, is washed
Wash, until in neutrality, being subsequently placed in vacuum drying chamber in 75 DEG C of drying, obtain bi-phthalonitrile derivative；
(3) in bi-phthalonitrile derivative, 2,6- bis- (4- amino-benzene oxygens) benzonitrile of its weight 3% is added, 250
Quick stirring 15min at DEG C so as to which reaction is uniform, is then rapidly cooled to room temperature, and sample milling is obtained final product into phthalocyanine resin pre-polymerization
Thing.
The itrile group of bis-phthalonitrile monomer can occur polyaddition into reaction under certain heating condition, form heteroaromatic
For the network structure of crosslinking points, there is excellent heat resistance using the phthalocyanine resin of this monomer preparation.
A kind of Al2O3The using method of-MgO-SiAlON ordinary steel anti-oxidation coating for heat treatment is comprised the following steps：
(1) by Al2O3- MgO-SiAlON ordinary steels anti-oxidation coating for heat treatment is mixed with water, is stirred, and adjusts slurry density
For 1.2～1.8kg/m3；
(2) slurry for preparing is sprayed or is brushed the billet surface in normal temperature to 500 DEG C.
The Al that the present invention is provided2O3- MgO-SiAlON ordinary steels anti-oxidation coating for heat treatment can be brushed in room temperature steel billet table
Face drying and forming-film, it is also possible to be painted on less than 500 DEG C of billet surface, and continuous protection painting is formed under high temperature action
Layer, effectively reduces oxidization burning loss of the steel billet in heating process.
Preferably, slurry is 0.3～0.5mm in the coating layer thickness of billet surface, usage of sizing agent is 0.3～0.5kg/
m2.Usage of sizing agent is few, and the coating of formation is too thin, and antioxidant effect is poor；Usage of sizing agent is excessive, and the coating of formation is too thick, can affect
Heat transfer in steel billet heat treatment process.
The invention has the beneficial effects as follows：(1) present invention adopts Al2O3- MgO-SiAlON materials are used as Al2O3-MgO-
The filler of SiAlON ordinary steel anti-oxidation coating for heat treatment, substantially increases Al2O3The common steel heat treatment antioxygens of-MgO-SiAlON
Change the heat-resisting quantity and chemical stability of coating, the Al that the present invention is provided2O3The anti-oxidant painting of the common steel heat treatments of-MgO-SiAlON
Material is anti-oxidant suitable for 800～1400 DEG C/1～30h heat treatments；(2) present invention is prepared compound using phthalocyanine resin prepolymer
Binding agent, improves binding agent stability at high temperature and viscosity, makes that coating is not easy to crack to come off, and enhances coating high temperature resistance
Oxidability；(3)Al2O3- MgO-SiAlON materials have low coefficient of thermal expansion, and after the completion of hot-working, coating is in cooling procedure
Automatically can peel off from billet surface, reduce dephosphorization difficulty.
Specific embodiment
Below by specific embodiment, technical scheme is described further.
In the present invention, if not refering in particular to, the raw material for being adopted and equipment etc. are commercially available or commonly used in the art,
Method in embodiment, if no special instructions, is the conventional method of this area.
Embodiment 1
A kind of Al2O3- MgO-SiAlON ordinary steel anti-oxidation coating for heat treatment, is made up of the raw material of following weight portion：Al2O3-
30 parts of MgO-SiAlON powders, Cr2O33 parts, 20 parts of compound binding agent, 0.5 part of potassium fluoborate, 0.5 part of boron carbide, above each group
Gradation degree is 300 mesh.
Wherein Al2O3- MgO-SiAlON powders are prepared by following methods：
(1) weight portion is respectively into 20 parts of corundum, 14 parts of MgO powder, the base that 10 parts of sharp metals and stones and 6 parts of β-SiAlON powder are well mixed
Material, in being placed in ball grinder, with absolute ethyl alcohol as medium ball milling 3h, wherein base-material and the mass ratio of absolute ethyl alcohol are 1.5: 1；
(2) compound after ball milling in step (1) is dried at 50 DEG C, then dry-mixed 30min again；
(3) compound after will be dry-mixed is compressing with the pressure of 50MPa, 150 DEG C of baking 4h of first Jing, then is placed in microwave high-temperature gas
In atmosphere stove, it is incubated after 3h in 1400 DEG C under conditions of buried charcoal, natural cooling obtains final product Al2O3- MgO-SiAlON powders.
Compound binding agent is prepared by following methods：
Weight portion is respectively into 60 parts of phthalocyanine resin prepolymers, 20 parts of silicon powders, 1 part of dimethylbenzene, 1 part of ethoxy of 3- aminopropyls three
Base silane is well mixed, and is heated to 150 DEG C, is incubated 2h, then is warming up to 250 DEG C, is incubated 4h, then is warming up to 350 DEG C of insulation 4h, from
So obtain final product compound binding agent after cooling.
Phthalocyanine resin prepolymer is prepared by following steps：
(1) the addition 0.4mol 4- nitro phthalic nitriles in the there-necked flask of 500mL, 0.2mol 4,4- dihydroxybiphenyls,
0.44mol Anhydrous potassium carbonates and 200mL DMFs, reaction system is heated, and control temperature is 80～90
DEG C, react 5h；
(2) after completion of the reaction, reactant liquor is poured slowly into the hydrochloric acid solution that pH is 4 and is precipitated, sediment is filtered repeatedly, is washed
Wash, until in neutrality, being subsequently placed in vacuum drying chamber in 75 DEG C of drying, obtain bi-phthalonitrile derivative；
(3) in bi-phthalonitrile derivative, 2,6- bis- (4- amino-benzene oxygens) benzonitrile of its weight 3% is added, 250
Quick stirring 15min at DEG C so as to which reaction is uniform, is then rapidly cooled to room temperature, and sample milling is obtained final product into phthalocyanine resin pre-polymerization
Thing.
By the above-mentioned Al2O3-MgO-SiAlON ordinary steel anti-oxidation coating for heat treatment water mixing for preparing, stirring is equal
Even, regulation slurry density is 1.2kg/m3, room temperature A36 ordinary steel billet surface is sprayed on, form the thick protections of one layer of 0.3mm and apply
Layer, usage of sizing agent is 0.3kg/m2, Jing after 800 DEG C are heat-treated 8h, matrix surface oxidization burning loss reduces by 95% to the steel billet after coating,
And coating can be peeled off naturally in cooling procedure.
Embodiment 2
A kind of Al2O3- MgO-SiAlON ordinary steel anti-oxidation coating for heat treatment, is made up of the raw material of following weight portion：Al2O3-
40 parts of MgO-SiAlON powders, Cr2O34 parts, 25 parts of compound binding agent, 1 part of potassium fluoborate, 1 part of boron carbide, above each group gradation
Spend for 400 mesh.
Wherein Al2O3- MgO-SiAlON powders are prepared by following methods：
(1) weight portion is respectively into 25 parts of corundum, 17 parts of MgO powder, what 15 parts of sharp metals and stones and 10 parts of β-SiAlON powder were well mixed
Base-material, in being placed in ball grinder, with absolute ethyl alcohol as medium ball milling 4h, wherein base-material and the mass ratio of absolute ethyl alcohol are 1.7: 1；
(2) compound after ball milling in step (1) is dried at 600 DEG C, then dry-mixed 35min again；
(3) compound after will be dry-mixed is compressing with the pressure of 50MPa, 170 DEG C of baking 5h of first Jing, then is placed in microwave high-temperature gas
In atmosphere stove, it is incubated after 4h in 1450 DEG C under conditions of buried charcoal, natural cooling obtains final product Al2O3- MgO-SiAlON powders.
Compound binding agent is prepared by following methods：
Weight portion is respectively into 70 parts of phthalocyanine resin prepolymers, 20 parts of silicon powders, 5 parts of boron carbides, 2 parts of dimethylbenzene, 2 parts of 3- amino
Propyl-triethoxysilicane is well mixed, and is heated to 200 DEG C, is incubated 4h, then is warming up to 300 DEG C, is incubated 6h, then is warming up to 400
DEG C, 8h is incubated, compound binding agent is obtained final product after natural cooling.
Phthalocyanine resin prepolymer is prepared by following steps：
(1) the addition 0.4mol 4- nitro phthalic nitriles in the there-necked flask of 500mL, 0.2mol 4,4- dihydroxybiphenyls,
0.44mol Anhydrous potassium carbonates and 200mL DMFs, reaction system is heated, and control temperature is 80～90
DEG C, react 5h；
(2) after completion of the reaction, reactant liquor is poured slowly into the hydrochloric acid solution that pH is 4 and is precipitated, sediment is filtered repeatedly, is washed
Wash, until in neutrality, being subsequently placed in vacuum drying chamber in 75 DEG C of drying, obtain bi-phthalonitrile derivative；
(3) in bi-phthalonitrile derivative, 2,6- bis- (4- amino-benzene oxygens) benzonitrile of its weight 3% is added, 250
Quick stirring 15min at DEG C so as to which reaction is uniform, is then rapidly cooled to room temperature, and sample milling is obtained final product into phthalocyanine resin pre-polymerization
Thing.
By the above-mentioned Al for preparing2O3- MgO-SiAlON ordinary steels anti-oxidation coating for heat treatment is mixed with water, is stirred,
Regulation slurry density is 1.5kg/m3, is sprayed on 500 DEG C of Q235A ordinary steel billet surfaces, forms the thick protections of one layer of 0.4mm
Coating, usage of sizing agent is 0.4kg/m2, Jing after 1100 DEG C are heat-treated 30h, matrix surface oxidization burning loss is reduced the steel billet after coating
93%, and coating can peel off naturally in cooling procedure.
Embodiment 3
A kind of Al2O3- MgO-SiAlON ordinary steel anti-oxidation coating for heat treatment, is made up of the raw material of following weight portion：Al2O3-
50 parts of MgO-SiAlON powders, Cr2O35 parts, 30 parts of compound binding agent, 1.5 parts of potassium fluoborate, 1.5 parts of boron carbide, above each group
Gradation degree is 500 mesh.
Wherein Al2O3- MgO-SiAlON powders are prepared by following methods：
(1) weight portion is respectively into 30 parts of corundum, 20 parts of MgO powder, the base that 20 parts of sharp metals and stones and 12 parts of β-SiAlON are well mixed
Material, powder is placed in ball grinder, and with absolute ethyl alcohol as medium ball milling 5h, wherein base-material and the mass ratio of absolute ethyl alcohol are 2: 1；
(2) compound after ball milling in step (1) is dried at 80 DEG C, then dry-mixed 40min again；
(3) compound after will be dry-mixed is compressing with the pressure of 60MPa, 180 DEG C of baking 6h of first Jing, then is placed in microwave high-temperature gas
In atmosphere stove, it is incubated after 5h in 1500 DEG C under conditions of buried charcoal, natural cooling obtains final product Al2O3- MgO-SiAlON powders.
Compound binding agent is prepared by following methods：
Weight portion is respectively into 80 parts of phthalocyanine resin prepolymers, 20 parts of silicon powders, 10 parts of montmorillonites, 3 parts of dimethylbenzene, 3 parts of 3- ammonia
Base propyl-triethoxysilicane is well mixed, and is heated to 250 DEG C, is incubated 5h, then is warming up to 350 DEG C, is incubated 10h, then is warming up to
450 DEG C, 10h is incubated, compound binding agent is obtained final product after natural cooling.
Phthalocyanine resin prepolymer is prepared by following steps：
(1) the addition 0.4mol 4- nitro phthalic nitriles in the there-necked flask of 500mL, 0.2mol 4,4- dihydroxybiphenyls,
0.44mol Anhydrous potassium carbonates and 200mL DMFs, reaction system is heated, and control temperature is 80～90
DEG C, react 5h；
(2) after completion of the reaction, reactant liquor is poured slowly into the hydrochloric acid solution that pH is 4 and is precipitated, sediment is filtered repeatedly, is washed
Wash, until in neutrality, being subsequently placed in vacuum drying chamber in 75 DEG C of drying, obtain bi-phthalonitrile derivative；
(3) in bi-phthalonitrile derivative, 2,6- bis- (4- amino-benzene oxygens) benzonitrile of its weight 3% is added, 250
Quick stirring 15min at DEG C so as to which reaction is uniform, is then rapidly cooled to room temperature, and sample milling is obtained final product into phthalocyanine resin pre-polymerization
Thing.
By the above-mentioned Al for preparing2O3- MgO-SiAlON ordinary steels anti-oxidation coating for heat treatment is mixed with water, is stirred,
Regulation slurry density is 1.8kg/m3, 500 DEG C of S235JR ordinary steel billet surfaces are sprayed, form the thick protections of one layer of 0.5mm
Coating, usage of sizing agent is 0.5kg/m2, Jing after 1400 DEG C are heat-treated 20h, matrix surface oxidization burning loss is reduced the steel billet after coating
91%, and coating can peel off naturally in cooling procedure.
Claims (8)
1. a kind of Al2O3- MgO-SiAlON ordinary steel anti-oxidation coating for heat treatment, it is characterised in that by the raw material of following weight portion
Composition：Al2O330 ~ 50 parts of-MgO-SiAlON powders, Cr2O3 3 ~ 5 parts, 20 ~ 30 parts of compound binding agent, potassium fluoborate 0.5 ~ 1.5
Part, 0.5 ~ 1.5 part of boron carbide, above each component granularity is 300 ~ 500 mesh.
2. a kind of Al according to claim 12O3- MgO-SiAlON ordinary steel anti-oxidation coating for heat treatment, its feature exists
In the Al2O3- MgO-SiAlON powders are obtained by following steps：
（1）Weight portion is respectively into 20 ~ 30 parts of corundum, 14 ~ 20 parts of MgO powder, 10 ~ 20 parts of sharp metals and stones and 6 ~ 12 parts of β-SiAlON powder
The base-material being well mixed, in being placed in ball grinder, with absolute ethyl alcohol as medium 3 ~ 5h of ball milling；
（2）By step（1）Compound after middle ball milling is dried at 50 ~ 80 DEG C, then dry-mixed 30 ~ 40min again；
（3）Compound after will be dry-mixed is compressing with the pressure of 50 ~ 60MPa, 150 ~ 180 DEG C of 4 ~ 6h of baking of first Jing, then is placed in
In microwave high temperature atmosphere stove, it is incubated after 3 ~ 5h in 1400 ~ 1500 DEG C under conditions of buried charcoal, natural cooling obtains final product Al2O3-MgO-
SiAlON powders.
3. a kind of Al according to claim 22O3- MgO-SiAlON ordinary steel anti-oxidation coating for heat treatment, its feature exists
In the step（1）Base-material is 1.5 ~ 2 with the mass ratio of absolute ethyl alcohol：1.
4. a kind of Al according to claim 12O3- MgO-SiAlON ordinary steel anti-oxidation coating for heat treatment, its feature exists
In the preparation method of the compound binding agent is as follows：
Weight portion is respectively into 60 ~ 80 parts of phthalocyanine resin prepolymers, 20 ~ 30 parts of fillers, 1 ~ 3 part of dimethylbenzene, 1 ~ 3 part of 3- aminopropan
Ethyl triethoxy silicane alkane is well mixed, and is heated to 150 ~ 250 DEG C, is incubated 2 ~ 5h, then is warming up to 250 ~ 350 DEG C, is incubated 4 ~ 10h,
350 ~ 450 DEG C are warming up to again, 4 ~ 10h is incubated, and compound binding agent is obtained final product after natural cooling.
5. a kind of Al according to claim 42O3- MgO-SiAlON ordinary steel anti-oxidation coating for heat treatment, its feature exists
In one or more of described filler in silicon powder, boron carbide, montmorillonite.
6. a kind of Al according to claim 42O3- MgO-SiAlON ordinary steel anti-oxidation coating for heat treatment, its feature exists
In the phthalocyanine resin prepolymer is obtained by following steps：
（1）The addition 0.4mol 4- nitro phthalic nitriles in the there-necked flask of 500mL, 0.2mol 4,4- dihydroxybiphenyls,
0.44mol Anhydrous potassium carbonates and 200mL DMFs, reaction system is heated, and controls temperature at 80 ~ 90 DEG C,
Reaction 5h；
（2）After completion of the reaction, reactant liquor is poured slowly into the hydrochloric acid solution that pH is 4 and is precipitated, sediment is filtered repeatedly, is washed
Wash, until in neutrality, being subsequently placed in vacuum drying chamber in 75 DEG C of drying, obtain bi-phthalonitrile derivative；
（3）In bi-phthalonitrile derivative, 2, the 6- bis- of its weight 3% is added（4- amino-benzene oxygens）Benzonitrile, 250
Quick stirring 15min at DEG C so as to which reaction is uniform, is then rapidly cooled to room temperature, and sample milling is obtained final product into phthalocyanine resin pre-polymerization
Thing.
7. a kind of Al as claimed in claim 12O3The using method of-MgO-SiAlON ordinary steel anti-oxidation coating for heat treatment, its
It is characterised by comprising the following steps：
（1）By Al2O3- MgO-SiAlON ordinary steels anti-oxidation coating for heat treatment is mixed with water, is stirred, and adjusts slurry density
For 1.2 ~ 1.8kg/m3；
（2）The slurry for preparing is sprayed or is brushed the billet surface in room temperature to 500 DEG C.
8. a kind of Al according to claim 72O3The using method of-MgO-SiAlON ordinary steel anti-oxidation coating for heat treatment,
Characterized in that, slurry is 0.3 ~ 0.5mm in the coating layer thickness of billet surface, usage of sizing agent is 0.3 ~ 0.5kg/m2。
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| CN107855684A (en) * | 2017-12-01 | 2018-03-30 | 温州宏丰电工合金股份有限公司 | A kind of preparation method for the stop-off gent for being used for gas brazing or fused salt dip brazing |
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