CN106676236A - SiC-MgO-SiAlON ordinary steel heat treatment antioxidant coating and application method thereof - Google Patents
SiC-MgO-SiAlON ordinary steel heat treatment antioxidant coating and application method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/68—Temporary coatings or embedding materials applied before or during heat treatment
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Abstract
The invention relates to the technical field of coatings, and discloses a SiC-MgO-SiAlON ordinary steel heat treatment antioxidant coating and an application method thereof. A SiC-MgO-SiAlON material is adopted as filler of the coating, and the high temperature resistance and chemical stability of the coating are improved; and a phthalocyanine resin prepolymer is adopted for preparing a composite binder, the stability and stickiness of the binder at the high temperature are improved, a coating is not prone to cracking and falling off, and the high-temperature oxidization resisting capacity of the coating is enhanced. The surface of a steel blank with the room temperature being 500 DEG C can be coated or brushed with the coating, after heat machining is completed, the coating can naturally fall off in the cooling process, and the dephosphorization difficulty is reduced. The coating is prepared from, by weight, 30-50 parts of SiC-MgO-SiAlON powder, 3-5 parts of Cr2O3, 20-30 parts of the composite binder, 0.5-1.5 parts of potassium fluoborate and 0.5-1.5 parts of boron carbide.
Description
Technical field
The present invention relates to technical field of coatings, and in particular to a kind of common steel heat treatment antioxidation of SiC-MgO-SiAlON is applied
Material 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 carries out heat treated, 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 have high demands, and are 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 have small investment, low cost, simple to operate, strong adaptability etc.
Feature.The ultimate principle of coating technology is that coating is coated on 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 are 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 chromic oxide are adjuvant, 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 common steel heat treatment antioxidation of the SiC-MgO-SiAlON with good heat-resisting quantity and caking property is applied
Material.
Present invention also offers a kind of using method of SiC-MgO-SiAlON ordinary steels anti-oxidation coating for heat treatment.
The present invention concrete technical scheme be：A kind of SiC-MgO-SiAlON ordinary steels anti-oxidation coating for heat treatment, by with
The raw material composition of lower weight portion：30 ~ 50 parts of SiC-MgO-SiAlON powder body, Cr2O3 3 ~ 5 parts, 20 ~ 30 parts of compound binding agent, fluorine
0.5 ~ 1.5 part of potassium borate, 0.5 ~ 1.5 part of boron carbide, above each component granularity are 300 ~ 500 mesh.
It is excellent that SiC-MgO-SiAlON materials have fusing point height, heat conductivity height, low thermal expansion, chemical stability good etc.
Performance, the present invention adopt SiC-MgO-SiAlON materials filling out as SiC-MgO-SiAlON ordinary steel anti-oxidation coating for heat treatment
Material, substantially increases the heat-resisting quantity and chemical stability of SiC-MgO-SiAlON ordinary steel anti-oxidation coating for heat treatment.Cr2O3
The paintability of coating can be improved, increase coating wettability at high temperature, form fine and close ORC.Fluoboric acid
Potassium is low-melting compound, plays a part of in the coating to flux, and increases the wettability of coating melt.Boron carbide is carried at high temperature
For active C atoms, the anti-decarburization capacity of matrix can be strengthened.
Preferably, SiC-MgO-SiAlON powder body is prepared by following methods：
（1）Weight portion is respectively into 20 ~ 40 parts of electro-corundums, 20 ~ 30 parts of magnesia powders, 10 ~ 20 parts of Si powder and 5 ~ 10 parts of β-
The base material of SiAlON powder mix homogeneously, is placed in ball grinder, with water as medium 1 ~ 2h of ball milling；
（2）By step（1）Compound after middle ball milling is dried at 80 ~ 100 DEG C, then dry-mixed 20 ~ 30min again；
（3）Compound after will be dry-mixed is compressing with the pressure of 70 ~ 80MPa, 2 ~ 3h of pressurize, then toasts 5 in 180 ~ 200 DEG C
~ 8h, then be placed in microwave high temperature atmosphere stove, after being incubated 4 ~ 8h in 1400 ~ 1500 DEG C under the conditions of buried charcoal, natural cooling is obtained final product
SiC-MgO-SiAlON powder body
The present invention adopts microwave heating synthesis, sintering to prepare SiC-MgO-SiAlON powder body, burns with sintering temperature, shortening is reduced
The advantage of knot temperature retention 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 dispersibility.
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 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 is warming up to 350
~ 450 DEG C, 4 ~ 10h is incubated, compound binding agent after natural cooling, is obtained final product..
Binding agent can preferentially form liquid phase viscid membrane at high temperature, become the bonded bridge of coating refractory, make coating shape
Into fine and close complex phase thin 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 wettability and dispersibility of the filler in resin.
Preferably, prepare the filler of compound binding agent 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, reactant liquor is poured slowly in the hydrochloric acid solution that pH is 4 and is precipitated, precipitate is filtered repeatedly, is washed
Wash, until in neutrality, drying in 75 DEG C in being subsequently placed in vacuum drying oven, obtaining bi-phthalonitrile derivant；
（3）In bi-phthalonitrile derivant, 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, sample pulverizing is obtained final product phthalocyanine resin pre-polymerization
Thing.
The itrile group of bis-phthalonitrile monomer can occur polyaddition under certain heating condition into reaction, 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 using method of SiC-MgO-SiAlON ordinary steels anti-oxidation coating for heat treatment is comprised the following steps：
（1）SiC-MgO-SiAlON ordinary steels anti-oxidation coating for heat treatment is mixed with water, is stirred, adjusting slurry density is
1.2~1.8kg/m3；
（2）The slurry for preparing is sprayed or the billet surface in room temperature to 500 DEG C is brushed.
The SiC-MgO-SiAlON ordinary steels anti-oxidation coating for heat treatment that the present invention is provided 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 steel billet
Heat transfer in heat treatment process.
The invention has the beneficial effects as follows：（1）The present invention is using SiC-MgO-SiAlON materials as SiC-MgO-SiAlON
The filler of ordinary steel anti-oxidation coating for heat treatment, substantially increases SiC-MgO-SiAlON ordinary steel anti-oxidation coating for heat treatment
Heat-resisting quantity and chemical stability, the SiC-MgO-SiAlON ordinary steel anti-oxidation coating for heat treatment that the present invention is provided are applied to
The antioxidation of 800 ~ 1400 DEG C/1 ~ 30h heat treatments；（2）The present invention prepares compound binding agent using phthalocyanine resin prepolymer, improves
Binding agent stability at high temperature and viscosity, make that coating is not easy to crack comes off, and enhance coating oxidation-resistance property；
（3）SiC-MgO-SiAlON materials have low coefficient of thermal expansion, after the completion of hot-working, coating in cooling procedure can automatically from
Billet surface is peeled off, and reduces 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 SiC-MgO-SiAlON ordinary steels anti-oxidation coating for heat treatment, is made up of the raw material of following weight portion：Al2O3-
30 parts of SiAlON-SiC powder body, Cr2O3 3 parts, 20 parts of compound binding agent, 0.5 part of Potassium borofluoride, 0.5 part of boron carbide, the above is each
Component particle size is 300 mesh.
Wherein SiC-MgO-SiAlON powder body is prepared by following methods：
（1）Weight portion is respectively into 20 parts of electro-corundums, 20 parts of magnesia powders, 10 parts of Si powder and the mixing of 5 parts of β-SiAlON powder it is equal
Even base material, is placed in ball grinder, and with water as medium ball milling 1h, wherein base material and water quality ratio are 1.5：1；
（2）By step（1）Compound after middle ball milling is dried at 80 DEG C, then dry-mixed 20min again；
（3）Compound after will be dry-mixed is compressing with the pressure of 70MPa, pressurize 2h, then toasts 5h in 180 DEG C, then is placed in
In microwave high temperature atmosphere stove, after being incubated 4h in 1400 DEG C under the conditions of buried charcoal, natural cooling obtains final product SiC-MgO-SiAlON powder body.
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 three ethoxy of 3- aminopropyls
Base silane mix homogeneously, 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
Compound binding agent is obtained final product after so cooling down.
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, reactant liquor is poured slowly in the hydrochloric acid solution that pH is 4 and is precipitated, precipitate is filtered repeatedly, is washed
Wash, until in neutrality, drying in 75 DEG C in being subsequently placed in vacuum drying oven, obtaining bi-phthalonitrile derivant；
（3）In bi-phthalonitrile derivant, 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, sample pulverizing is obtained final product phthalocyanine resin pre-polymerization
Thing.
By the above-mentioned SiC-MgO-SiAlON ordinary steel anti-oxidation coating for heat treatment water mixing for preparing, stir,
Regulation slurry density is 1.2kg/m3, room temperature A36 ordinary steel billet surface is sprayed on, the thick protective coatings of one layer of 0.3mm are formed,
Usage of sizing agent is 0.3kg/m2, Jing after 800 DEG C of heat treatment 8h, matrix surface oxidization burning loss reduces by 95% to the steel billet after coating, and applies
Layer can be peeled off in cooling procedure naturally.
Embodiment 2
A kind of SiC-MgO-SiAlON ordinary steels anti-oxidation coating for heat treatment, is made up of the raw material of following weight portion：Al2O3-
40 parts of SiAlON-SiC powder body, Cr2O3 4 parts, 25 parts of compound binding agent, 1 part of Potassium borofluoride, 1 part of boron carbide, above each component
Granularity is 400 mesh.
Wherein SiC-MgO-SiAlON powder body is prepared by following methods：
（1）Weight portion is respectively into 30 parts of electro-corundums, 25 parts of magnesia powders, 15 parts of Si powder and the mixing of 7 parts of β-SiAlON powder it is equal
Even base material, is placed in ball grinder, and with water as medium ball milling 1.5h, wherein base material and the mass ratio of water are 1.7：1；
（2）By step（1）Compound after middle ball milling is dried at 90 DEG C, then dry-mixed 25min again；
（3）Compound after will be dry-mixed is compressing with the pressure of 75MPa, pressurize 2.5h, then toasts 6h in 190 DEG C, then puts
In microwave high temperature atmosphere stove, after being incubated 7h in 1450 DEG C under the conditions of buried charcoal, natural cooling obtains final product SiC-MgO-SiAlON powder
Body.
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 mix homogeneously, 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 after natural cooling, is obtained final product.
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, reactant liquor is poured slowly in the hydrochloric acid solution that pH is 4 and is precipitated, precipitate is filtered repeatedly, is washed
Wash, until in neutrality, drying in 75 DEG C in being subsequently placed in vacuum drying oven, obtaining bi-phthalonitrile derivant；
（3）In bi-phthalonitrile derivant, 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, sample pulverizing is obtained final product phthalocyanine resin pre-polymerization
Thing.
By the above-mentioned SiC-MgO-SiAlON ordinary steel anti-oxidation coating for heat treatment water mixing for preparing, stir,
Regulation slurry density is 1.5kg/m3, 500 DEG C of Q235A ordinary steel billet surfaces are sprayed on, the thick protections of one layer of 0.4mm are formed
Coating, usage of sizing agent are 0.4kg/m2, Jing after 1100 DEG C of heat treatment 30h, matrix surface oxidization burning loss is reduced the steel billet after coating
93%, and coating can be peeled off in cooling procedure naturally.
Embodiment 3
A kind of SiC-MgO-SiAlON ordinary steels anti-oxidation coating for heat treatment, is made up of the raw material of following weight portion：Al2O3-
50 parts of SiAlON-SiC powder body, Cr2O3 5 parts, 30 parts of compound binding agent, 1.5 parts of Potassium borofluoride, 1.5 parts of boron carbide, the above is each
Component particle size is 500 mesh.
Wherein SiC-MgO-SiAlON powder body is prepared by following methods：
（1）Weight portion is respectively into 40 parts of electro-corundums, 30 parts of magnesia powders, 20 parts of Si powder and the mixing of 10 parts of β-SiAlON powder it is equal
Even base material, is placed in ball grinder, and with water as medium ball milling 2h, wherein base material and the mass ratio of water are 2：1；
（2）By step（1）Compound after middle ball milling is dried at 100 DEG C, then dry-mixed 30min again；
（3）Compound after will be dry-mixed is compressing with the pressure of 80MPa, pressurize 3h, then toasts 8h in 200 DEG C, then is placed in
In microwave high temperature atmosphere stove, after being incubated 8h in 1500 DEG C under the conditions of buried charcoal, natural cooling obtains final product Al2O3- SiAlON-SiC powder
Body.
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 mix homogeneously, 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 after natural cooling, is obtained final product.
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, reactant liquor is poured slowly in the hydrochloric acid solution that pH is 4 and is precipitated, precipitate is filtered repeatedly, is washed
Wash, until in neutrality, drying in 75 DEG C in being subsequently placed in vacuum drying oven, obtaining bi-phthalonitrile derivant；
（3）In bi-phthalonitrile derivant, 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, sample pulverizing is obtained final product phthalocyanine resin pre-polymerization
Thing.
By the above-mentioned SiC-MgO-SiAlON ordinary steel anti-oxidation coating for heat treatment water mixing for preparing, stir,
Regulation slurry density is 1.8kg/m3, 500 DEG C of S235JR ordinary steel billet surfaces are sprayed, the thick protections of one layer of 0.5mm are formed
Coating, usage of sizing agent are 0.5kg/m2, Jing after 1400 DEG C of heat treatment 20h, matrix surface oxidization burning loss is reduced the steel billet after coating
91%, and coating can be peeled off in cooling procedure naturally.
Claims (8)
1. a kind of SiC-MgO-SiAlON ordinary steels anti-oxidation coating for heat treatment, it is characterised in that by the raw material group of following weight portion
Into：
30 ~ 50 parts of SiC-MgO-SiAlON powder body, Cr2O3 3 ~ 5 parts, 20 ~ 30 parts of compound binding agent, 0.5 ~ 1.5 part of Potassium borofluoride,
0.5 ~ 1.5 part of boron carbide, above each component granularity are 300 ~ 500 mesh.
2. a kind of SiC-MgO-SiAlON ordinary steels anti-oxidation coating for heat treatment according to claim 1, it is characterised in that
The SiC-MgO-SiAlON powder body is obtained by following steps：
（1）Weight portion is respectively into 20 ~ 40 parts of electro-corundum, 20 ~ 30 parts of magnesia powder, 10 ~ 20 parts of Si powder and 5 ~ 10
β-SiAlON powder the mix homogeneously of part, obtains base material, is placed in ball grinder, with water as medium 1 ~ 2h of ball milling；
（2）By step（1）Compound after middle ball milling is dried at 80 ~ 100 DEG C, then dry-mixed 20 ~ 30min again；
（3）Compound after will be dry-mixed is compressing with the pressure of 70 ~ 80MPa, 2 ~ 3h of pressurize, then toasts 5 in 180 ~ 200 DEG C
~ 8h, then be placed in microwave high temperature atmosphere stove, after being incubated 4 ~ 8h in 1400 ~ 1500 DEG C under the conditions of buried charcoal, natural cooling is obtained final product
SiC-MgO-SiAlON powder body.
3. a kind of SiC-MgO-SiAlON ordinary steels anti-oxidation coating for heat treatment according to claim 2, it is characterised in that
The step（1）Base material is 1.5 ~ 2 with the mass ratio of water：1.
4. a kind of SiC-MgO-SiAlON ordinary steels anti-oxidation coating for heat treatment according to claim 1, it is characterised in that
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 mix homogeneously, 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, be incubated 4 ~ 10h, compound binding agent is obtained final product after natural cooling.
5. a kind of SiC-MgO-SiAlON ordinary steels anti-oxidation coating for heat treatment according to claim 4, it is characterised in that
Described filler is selected from silicon powder, boron carbide, one or more in montmorillonite.
6. a kind of SiC-MgO-SiAlON ordinary steels anti-oxidation coating for heat treatment according to claim 4, it is characterised in that
The phthalocyanine resin prepolymer is obtained by following steps：
（1）0.35-0.45 mol 4- nitro phthalic nitriles, 0.15-0.25 mol 4,4- dihydroxy are added in there-necked flask
Biphenyl, 0.40-0.48mol Anhydrous potassium carbonates and 180-220 mL DMFs, reaction system is heated, control
Temperature processed reacts 4-6h at 80 ~ 90 DEG C；
（2）After completion of the reaction, reactant liquor is poured slowly in the hydrochloric acid solution that pH is 3.5-4.5 and is precipitated, by precipitate mistake repeatedly
Filter, washing, until in neutrality, drying in 70-80 DEG C in being subsequently placed in vacuum drying oven, obtaining bi-phthalonitrile derivant；
（3）In bi-phthalonitrile derivant, 2, the 6- bis- of its weight 2.5-3.5% is added（4- amino-benzene oxygens）Benzonitrile,
The quick stirring 10-20min at 240-260 DEG C so as to which reaction is uniform, is then rapidly cooled to room temperature, sample pulverizing is obtained final product
Phthalocyanine resin prepolymer.
7. a kind of using method of SiC-MgO-SiAlON ordinary steels anti-oxidation coating for heat treatment as claimed in claim 1, its
It is characterised by comprising the following steps：
（1）SiC-MgO-SiAlON ordinary steels anti-oxidation coating for heat treatment is mixed with water, is stirred, adjusting slurry density is
1.2~1.8kg/m3；
（2）The slurry for preparing is sprayed or the billet surface in room temperature to 500 DEG C is brushed.
8. the using method of a kind of SiC-MgO-SiAlON ordinary steels anti-oxidation coating for heat treatment according to claim 7,
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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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110093483A (en) * | 2019-05-13 | 2019-08-06 | 成都锦江电子***工程有限公司 | A kind of anti-oxidation decarburizing coating and its protection heat treatment process |
| CN111334101A (en) * | 2020-04-14 | 2020-06-26 | 北京天力创玻璃科技开发有限公司 | High-temperature protective coating for rail steel hot rolling and rail steel hot rolling method |
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| CN111334101A (en) * | 2020-04-14 | 2020-06-26 | 北京天力创玻璃科技开发有限公司 | High-temperature protective coating for rail steel hot rolling and rail steel hot rolling method |
| CN111334101B (en) * | 2020-04-14 | 2022-05-20 | 北京天力创玻璃科技开发有限公司 | High-temperature protective coating for rail steel hot rolling and rail steel hot rolling method |
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