CN106700898A - SiAlON-SiC common steel heat treatment anti-oxidant coating and using method thereof - Google Patents
SiAlON-SiC common steel heat treatment anti-oxidant coating and using method thereof Download PDFInfo
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Abstract
The invention discloses a SiAlON-SiC common steel heat treatment anti-oxidant coating and a using method thereof. The SiAlON-SiC common steel heat treatment anti-oxidant coating consist of the following raw materials in parts by weight: 30 to 50 parts of SiAlON-SiC powder, 3 to 5 parts of Cr2O3, 20 to 30 parts of a composite adhesive, 0.5 to 1.5 parts of potassium fluoborate, and 0.5 to 1.5 parts of boron carbide. According to the SiAlON-SiC common steel heat treatment anti-oxidant coating, the SiAlON-SiC material is taken as filler, so that the high temperature resistance and the chemical stability of the coating are improved; the composite adhesive is prepared by adopting phthalocyanine resin prepolymer, so that the stability and the viscidity of the adhesive at a high temperature are improved, and a coating does not crack or fall off easily. The coating provided by the invention can be sprayed or brushed onto the surface of a steel blank at room temperature to 500 DEG C; after heat machining is completed, the coating can fall off naturally during a cooling process.
Description
Technical field
The present invention relates to technical field of coatings, and in particular to a kind of SiAlON-SiC ordinary steels anti-oxidation coating for heat treatment and
Its application 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 can be along with alloying element dilution
And decarburization.This phenomenon directly governs the raising of Rolling Yield, have impact on the surface quality of finished steel.Prevent steel 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 heated under being placed in vacuum environment or inert gas shielding environment, 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 requirement is high, is not suitable for steel
Ironwork high-volume heat treatment process.High temperature coating method is a kind of heat treatment protection technique that recent decades grow up, relatively
Vacuum method and protective atmosphere method process technology, this guard method have 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
Billet surface and intensity dense sintering layer higher, 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 are also relatively poor, and it is not to manage to cause the coating oxidation-protective effect very much
Think.
The content of the invention
It is an object of the invention to overcoming existing ordinary steel anti-oxidation coating for heat treatment poor chemical stability, easy to crack coming off
Problem, there is provided a kind of SiAlON-SiC ordinary steel anti-oxidation coating for heat treatment with good heat-resisting quantity and caking property.
Present invention also offers a kind of application method of SiAlON-SiC ordinary steels anti-oxidation coating for heat treatment.
Concrete technical scheme of the invention is：A kind of SiAlON-SiC ordinary steels anti-oxidation coating for heat treatment, by following heavy
Measure the raw material composition of part：30 ~ 50 parts of SiAlON-SiC 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.
SiAlON-SiC materials have the Optimalities such as fusing point is high, thermal conductivity factor is high, low thermal expansion, chemical stability are good
Can, the present invention, as the filler of SiAlON-SiC ordinary steel anti-oxidation coating for heat treatment, is carried significantly using SiAlON-SiC materials
The high heat-resisting quantity and chemical stability of SiAlON-SiC ordinary steel anti-oxidation coating for heat treatment.Cr2O3Coating can be improved
Paintability, increases coating wettability at high temperature, forms fine and close ORC.Potassium fluoborate is low melting point chemical combination
Thing, plays fluxing, the wettability of increase coating melt in the coating.Boron carbide provides active C atoms at high temperature, can
To strengthen the anti-decarburization capacity of matrix.
Preferably, SiAlON-SiC powders are prepared by following methods：
（1）Weight portion is respectively 12 ~ 16 parts of Si powder, 15 ~ 19 parts of Al powder, 10 ~ 15 parts of SiO2Powder and 30 ~ 40 parts of SiC powder mixing
Uniform base-material, is placed in ball grinder, is medium 2.5 ~ 3h of ball milling, then freeze-drying with water；
（2）By step（1）In dried compound it is compressing under the pressure of 40 ~ 50MPa, 2 ~ 3h of pressurize；
（3）The compound that will be suppressed is placed in microwave high temperature atmosphere stove, is first warming up to 1300 ~ 1500 DEG C and is incubated 3 ~ 5h, is risen
Warm speed is 10 ~ 15 DEG C/min, then is warming up to 1500 ~ 1600 DEG C and is incubated 2 ~ 3h, and heating rate is 10 ~ 15 DEG C/min, microwave
The nitrogen of flowing is passed through in heating process, flow is 1 ~ 3L/min, and SiAlON-SiC powders are obtained final product after natural cooling.
The present invention uses heating using microwave synthesis, sintering to prepare SiAlON-SiC powders, is burnt with sintering temperature, shortening is reduced
Tie the advantage of soaking time.
Preferably, step（1）Middle base-material is 1.5 ~ 2 with the mass ratio of water：1.The concentration of compound in optimum range,
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 60 ~ 80 parts of phthalocyanine resin prepolymers, 20 ~ 30 parts of fillers, 1 ~ 3 part of dimethylbenzene, 1 ~ 3 part of triethoxy
Silane mixture is uniform, 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 be warming up to 350
~ 450 DEG C, 4 ~ 10h is incubated, compound binding agent is obtained final product after natural cooling..
Binding agent can preferentially form liquid phase viscid membrane at high temperature, the bonded bridge as 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 the filler of compound binding agent selected from one or more 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 controls temperature at 80 ~ 90 DEG C,
Reaction 5h；
（2）After completion of the reaction, reaction solution is poured slowly into the hydrochloric acid solution that pH is 4 and is precipitated, sediment 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, makes its reaction 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 addition polymerization synthetic reaction under certain heating condition, form heteroaromatic
It is the network structure of crosslinking points, the phthalocyanine resin prepared using this monomer has excellent heat resistance.
A kind of application method of SiAlON-SiC ordinary steels anti-oxidation coating for heat treatment is comprised the following steps：
（1）By SiAlON-SiC ordinary steels anti-oxidation coating for heat treatment with water mix, stir, regulation slurry density be 1.2 ~
1.8kg/m3；
（2）The slurry that will be prepared sprays or brushes the billet surface in room temperature to 500 DEG C.
The SiAlON-SiC ordinary steels anti-oxidation coating for heat treatment that the present invention is provided can be brushed dry in normal temperature billet surface
Dry film forming, it is also possible to be painted on less than 500 DEG C of billet surface, and continuous protective coating is formed under high temperature action, have
Effect 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 influence steel billet
Heat transfer in heat treatment process.
The beneficial effects of the invention are as follows：（1）The present invention is using SiAlON-SiC materials as SiAlON-SiC ordinary steels heat
The filler of antioxidant coating is processed, heat-resisting quantity and the change of SiAlON-SiC ordinary steel anti-oxidation coating for heat treatment is substantially increased
Stability is learned, the SiAlON-SiC ordinary steels anti-oxidation coating for heat treatment that the present invention is provided is applied to 800 ~ 1400 DEG C/1 ~ 30h heat
What is processed is anti-oxidant；（2）The present invention prepares compound binding agent using phthalocyanine resin prepolymer, improves binding agent at high temperature
Stability and viscosity, make that coating is not easy to crack to come off, and enhance coating oxidation-resistance property；（3）SiAlON-SiC materials have
There is low coefficient of thermal expansion, after the completion of hot-working, coating can be peeled off from billet surface automatically in cooling procedure, reduce dephosphorization
Difficulty.
Specific embodiment
Below by specific embodiment, technical scheme is described further.
In the present invention, if not refering in particular to, raw material and equipment for being used etc. is commercially available or commonly used in the art,
Method in embodiment, unless otherwise instructed, is the conventional method of this area.
Embodiment 1
A kind of SiAlON-SiC ordinary steels anti-oxidation coating for heat treatment, is made up of the raw material of following weight portion：SiAlON-SiC powder
30 parts of body, Cr2O3 3 parts, 20 parts of compound binding agent, 0.5 part of potassium fluoborate, 0.5 part of boron carbide, above each component granularity is 300
Mesh.
Wherein SiAlON-SiC powders are prepared by following methods：
（1）Weight portion is respectively 12 parts of Si powder, 15 parts of Al powder, 10 parts of SiO2Powder and the well mixed base-material of 30 parts of SiC powder, put
It is medium ball milling 2.5h with water in ball grinder, then freeze-drying, wherein base-material are 1.5 with water quality ratio：1；
（2）By step（1）In dried compound it is compressing under the pressure of 40MPa, pressurize 2h；
（3）The compound that will be suppressed is placed in microwave high temperature atmosphere stove, is first warming up to 1300 DEG C and is incubated 3h, and heating rate is
10 DEG C/min, then be warming up to 1500 DEG C and be incubated 2h, heating rate is 10 DEG C/min, and the nitrogen of flowing is passed through in microwave heating process
Gas, flow is 1L/min, and SiAlON-SiC powders are obtained final product after natural cooling.
Compound binding agent is prepared by following methods：
Weight portion is respectively 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 compound binding agent is obtained final product 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 controls temperature at 80 ~ 90 DEG C,
Reaction 5h；
（2）After completion of the reaction, reaction solution is poured slowly into the hydrochloric acid solution that pH is 4 and is precipitated, sediment 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, makes its reaction uniform, is then rapidly cooled to room temperature, and sample milling is obtained final product into phthalocyanine resin pre-polymerization
Thing.
The above-mentioned SiAlON-SiC ordinary steel anti-oxidation coating for heat treatment water for preparing is mixed, is stirred, adjusted
Slurry density is 1.2kg/m3, room temperature A36 ordinary steel billet surfaces are sprayed on, form the thick protective coatings of one layer of 0.3mm, slurry
Consumption is 0.3kg/m2, after the steel billet after coating is heat-treated 8h through 800 DEG C, matrix surface oxidization burning loss reduces by 95%, and coating exists
Can be peeled off naturally in cooling procedure.
Embodiment 2
A kind of SiAlON-SiC ordinary steels anti-oxidation coating for heat treatment, is made up of the raw material of following weight portion：SiAlON-SiC powder
40 parts of body, Cr2O3 4 parts, 25 parts of compound binding agent, 1 part of potassium fluoborate, 1 part of boron carbide, above each component granularity is 400 mesh.
Wherein SiAlON-SiC powders are prepared by following methods：
（1）Weight portion is respectively 14 parts of Si powder, 17 parts of Al powder, 12 parts of SiO2Powder and the well mixed base-material of 35 parts of SiC powder, put
It is medium ball milling 2.5h with water in ball grinder, then freeze-drying, wherein base-material are 1.7 with the mass ratio of water：1；；
（2）By step（1）In dried compound it is compressing under the pressure of 45MPa, pressurize 2.5h；
（3）The compound that will be suppressed is placed in microwave high temperature atmosphere stove, is first warming up to 1400 DEG C and is incubated 4h, and heating rate is
12 DEG C/min, then be warming up to 1500 DEG C and be incubated 2.5h, heating rate is 12 DEG C/min, and flowing is passed through in microwave heating process
Nitrogen, flow is 2L/min, and SiAlON-SiC powders are obtained final product after natural cooling.
Compound binding agent is prepared by following methods：
Weight portion is respectively 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 be 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 controls temperature at 80 ~ 90 DEG C,
Reaction 5h；
（2）After completion of the reaction, reaction solution is poured slowly into the hydrochloric acid solution that pH is 4 and is precipitated, sediment 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, makes its reaction uniform, is then rapidly cooled to room temperature, and sample milling is obtained final product into phthalocyanine resin pre-polymerization
Thing.
The above-mentioned SiAlON-SiC ordinary steel anti-oxidation coating for heat treatment water for preparing is mixed, is stirred, adjusted
Slurry density is 1.5kg/m3, 500 DEG C of Q235A ordinary steel billet surfaces are sprayed on, form the thick protections of one layer of 0.4mm and apply
Layer, usage of sizing agent is 0.4kg/m2, after the steel billet after coating is heat-treated 30h through 1100 DEG C, the reduction of matrix surface oxidization burning loss
93%, and coating can peel off naturally in cooling procedure.
Embodiment 3
A kind of SiAlON-SiC ordinary steels anti-oxidation coating for heat treatment, is made up of the raw material of following weight portion：SiAlON-SiC powder
50 parts of body, Cr2O3 5 parts, 30 parts of compound binding agent, 1.5 parts of potassium fluoborate, 1.5 parts of boron carbide, above each component granularity is
500 mesh.
Wherein SiAlON-SiC powders are prepared by following methods：
（1）Weight portion is respectively 16 parts of Si powder, 19 parts of Al powder, 15 parts of SiO2Powder and the well mixed base-material of 40 parts of SiC powder, put
It is medium ball milling 3h with water in ball grinder, then freeze-drying, wherein base-material are 2 with the mass ratio of absolute ethyl alcohol：1；
（2）By step（1）In dried compound it is compressing under the pressure of 50MPa, pressurize 3h；
（3）The compound that will be suppressed is placed in microwave high temperature atmosphere stove, is first warming up to 1500 DEG C and is incubated 5h, and heating rate is
15 DEG C/min, then be warming up to 1600 DEG C and be incubated 3h, heating rate is 15 DEG C/min, and the nitrogen of flowing is passed through in microwave heating process
Gas, flow is 3L/min, and SiAlON-SiC powders are obtained final product after natural cooling.
Compound binding agent is prepared by following methods：
Weight portion is respectively 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 be 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 controls temperature at 80 ~ 90 DEG C,
Reaction 5h；
（2）After completion of the reaction, reaction solution is poured slowly into the hydrochloric acid solution that pH is 4 and is precipitated, sediment 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, makes its reaction uniform, is then rapidly cooled to room temperature, and sample milling is obtained final product into phthalocyanine resin pre-polymerization
Thing.
The above-mentioned SiAlON-SiC ordinary steel anti-oxidation coating for heat treatment water for preparing is mixed, is stirred, adjusted
Slurry density is 1.8kg/m3, the S235JR ordinary steel billet surfaces of 500 DEG C of spraying, one layer of 0.5mm of formation thick protective coating,
Usage of sizing agent is 0.5kg/m2, after the steel billet after coating is heat-treated 20h through 1400 DEG C, matrix surface oxidization burning loss reduction by 91%, and
Coating can be peeled off naturally in cooling procedure.
Claims (8)
1. a kind of SiAlON-SiC ordinary steels anti-oxidation coating for heat treatment, it is characterised in that be made up of the raw material of following weight portion：
30 ~ 50 parts of SiAlON-SiC powders, Cr2O3 3 ~ 5 parts, 20 ~ 30 parts of compound binding agent, 0.5 ~ 1.5 part of potassium fluoborate, boron carbide
0.5 ~ 1.5 part, above each component granularity is 300 ~ 500 mesh.
2. a kind of SiAlON-SiC ordinary steels anti-oxidation coating for heat treatment according to claim 1, it is characterised in that described
SiAlON-SiC powders, are obtained by following steps：
（1）Weight portion is respectively 12 ~ 16 parts of Si powder, 15 ~ 19 parts of Al powder, 10 ~ 15 parts of SiO2Powder and 30 ~ 40 parts of SiC powder mixing are equal
Even base-material, is placed in ball grinder, is medium 2.5 ~ 3h of ball milling, then freeze-drying with water；
（2）By step（1）In dried compound it is compressing under the pressure of 40 ~ 50MPa, 2 ~ 3h of pressurize；
（3）The compound that will be suppressed is placed in microwave high temperature atmosphere stove, is first warming up to 1300 ~ 1500 DEG C and is incubated 3 ~ 5h, is risen
Warm speed is 10 ~ 15 DEG C/min, then is warming up to 1500 ~ 1600 DEG C and is incubated 2 ~ 3h, and heating rate is 10 ~ 15 DEG C/min, microwave
The nitrogen of flowing is passed through in heating process, flow is 1 ~ 3L/min, and SiAlON-SiC powders are obtained final product after natural cooling.
3. a kind of SiAlON-SiC ordinary steels anti-oxidation coating for heat treatment according to claim 2, it is characterised in that described
Step（1）Base-material is 1.5 ~ 2 with the mass ratio of water：1.
4. a kind of SiAlON-SiC ordinary steels anti-oxidation coating for heat treatment according to claim 1, it is characterised in that described
The preparation method of compound binding agent is as follows：
Weight portion is respectively 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 SiAlON-SiC ordinary steels anti-oxidation coating for heat treatment according to claim 4, it is characterised in that described
Filler is selected from one or more in silicon powder, boron carbide, montmorillonite.
6. a kind of SiAlON-SiC ordinary steels anti-oxidation coating for heat treatment according to claim 4, it is characterised in that described
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, reaction solution is poured slowly into the hydrochloric acid solution that pH is 4 and is precipitated, sediment 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, makes its reaction 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 application method of SiAlON-SiC ordinary steels anti-oxidation coating for heat treatment as claimed in claim 1, its feature
It is to comprise the following steps：
（1）By SiAlON-SiC ordinary steels anti-oxidation coating for heat treatment with water mix, stir, regulation slurry density be 1.2 ~
1.8kg/m3；
（2）The slurry that will be prepared sprays or brushes the billet surface in room temperature to 500 DEG C.
8. the application method of a kind of SiAlON-SiC ordinary steels anti-oxidation coating for heat treatment according to claim 7, it is special
Levy and be, 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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| KR20200033671A (en) * | 2018-09-20 | 2020-03-30 | 주식회사 엘지화학 | A resin composition for metallic surface coating having high heat resistance and low friction property and a metallic substrate coated with the resin composition |
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| KR102409436B1 (en) * | 2018-09-20 | 2022-06-14 | 주식회사 엘지화학 | A resin composition for metallic surface coating having high heat resistance and low friction property and a metallic substrate coated with the resin composition |
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