CN111234574A - Decarburizing coating for lost foam cast steel - Google Patents

Decarburizing coating for lost foam cast steel Download PDF

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Publication number
CN111234574A
CN111234574A CN202010102840.4A CN202010102840A CN111234574A CN 111234574 A CN111234574 A CN 111234574A CN 202010102840 A CN202010102840 A CN 202010102840A CN 111234574 A CN111234574 A CN 111234574A
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parts
coating
lost foam
powder
component
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CN202010102840.4A
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CN111234574B (en
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李保良
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Sanmenxia Sun Casting Material Co ltd
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Sanmenxia Sun Casting Material Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
    • C09D1/02—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances alkali metal silicates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
    • B01F27/92—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with helices or screws
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
    • B01F27/96—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with openwork frames or cages
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/18—Fireproof paints including high temperature resistant paints
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/61—Additives non-macromolecular inorganic
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/80—Processes for incorporating ingredients

Abstract

The invention discloses a decarburized coating for lost foam cast steel, which comprises a solid component A and a liquid component B; the solid component A comprises the following raw materials in parts by weight: 20-35 parts of aluminum oxide, 10-15 parts of silicon carbide, 2-5 parts of magnesium oxide, 0.5-2 parts of calcium oxide and 0.5-1 part of nickel sulfate; the liquid component B comprises the following raw materials in parts by weight: 50-70 parts of a binder; form one deck when disappearance die casting steel material heating compact, enable base member and the isolated firm protection film of heating atmosphere on the metal surface, reduce the oxidation decarbonization phenomenon of high-speed steel, and can prevent other element infiltration, be convenient for clear away after using this coating heating, peel off automatically, have higher adhesive force after using this coating, and have better stripping nature again after the heating, effectively reduce process cost and metal consumption, promoted product yield greatly.

Description

Decarburizing coating for lost foam cast steel
Technical Field
The invention relates to the technical field of decarburization coatings for cast steel, in particular to a decarburization coating for lost foam cast steel.
Background
The steel can form an oxide layer in high-temperature forging and pressing forming, and the decarburization phenomenon can also occur, and the high-temperature metal decarburization process is that the carbon in the steel reacts with hydrogen or oxygen at high temperature to generate methane or carbon monoxide, so that the carbon content is reduced. In the industrial development process, a large amount of high-temperature resistant materials are applied to steel, and the high-temperature oxidation-resistant anti-decarbonization coating can effectively prevent the loss of the steel, save energy and save materials.
The fuel adopted by the lost foam cast steel in the hot rolling process is coal, coke or natural gas generally, the temperature can reach as high as 1280 ℃, and O exists in the heating atmosphere2, CO2, H2O and SO2Isooxidative species, and therefore necessarily subject to chemical attack, are primarily expressed in oxidation and decarburization. In actual production, in order to remove the oxide scale and the decarburized layer, surface layer removing treatment is needed, labor and time are wasted, the economic benefit of enterprises is greatly influenced, the process cost and the metal consumption are increased, and the product yield is greatly reduced.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the decarburized coating for the lost foam cast steel, which aims at overcoming the defects in the prior art; form one deck when disappearance die casting steel material heating compact, enable base member and the isolated firm protection film of heating atmosphere on the metal surface, reduce the oxidation decarbonization phenomenon of high-speed steel, and can prevent other element infiltration, be convenient for clear away after using this coating heating, peel off automatically, have higher adhesive force after using this coating, and have better stripping nature again after the heating, effectively reduce process cost and metal consumption, promoted product yield greatly.
The invention provides the following technical scheme:
a decarburized coating for lost foam casting, which comprises a component A and a component B; the component A comprises the following raw materials in parts by weight: 20-35 parts of aluminum oxide, 10-15 parts of silicon carbide, 2.2-5 parts of magnesium oxide, 0.5-2 parts of calcium oxide and 0.5-1 part of nickel sulfate; the component B comprises the following raw materials in parts by weight: 50-70 parts of a binder.
Preferably, the component A also comprises 3 to 8 weight parts of white mud; the binder is water glass solution.
Preferably, the raw materials in the component A are all powder, and the particle size range of the powder is 150-350 meshes.
Preferably, the binder accounts for 7-12% of the total mass fraction.
Preferably, the main mineral component of the white mud is kaolinite, and the kaolinite comprises 46.54% of SiO239.5% of Al2O313.96% of H2O。
Preferably, the component A also comprises 7.7-8.2 parts of aluminum powder, 8.4-11.3 parts of silicon powder and 1.3-2.6 parts of graphite powder. The aluminum powder, the silicon powder and the graphite powder are fine powder, and the specific surface area S of the fine powder is 330-2/g。
Preferably, the alumina is ultrafine alumina powder, the primary grain size d1 of the ultrafine alumina powder is 0.4-0.6 mu m, the content of the alumina in the ultrafine alumina powder is more than or equal to 99.8 percent, the content of the sodium oxide is less than or equal to 0.2 percent, the content of the silicon dioxide is less than or equal to 0.06 percent, the mass percentage content of the iron oxide is less than or equal to 0.04 percent, and the specific gravity is 4.32g/cm3。
Preferably, the mass percentage content of SiC in the silicon carbide is more than or equal to 97.5 percent, and the refractoriness of the silicon carbide is more than 1930 ℃.
Preferably, the coating adopts high-melting-point oxides of alumina, magnesia and silica as a framework, the low-melting-point oxides are melted into a film to form a compact glassy coating, the contact between a heating atmosphere and a substrate is isolated, the protection effect in a high-temperature stage is achieved, and the protection effect of the protective coating is achieved in a wider temperature range.
Preferably, when the coating is in a low-temperature stage, silicon carbide reacts with oxygen to generate silicon dioxide, and the silicon dioxide reacts with iron oxide on the surface of the steel part at a high temperature to generate an (fayalite) easily-peeled ceramic layer; the alumina has high chemical stability, and can improve the heat resistance of the coating; the magnesium oxide can increase the melting temperature of the glass enamel, so that the coating is inert to certain steels and can be automatically peeled off when the workpiece is cooled; the addition of calcium oxide can improve the fluidity and lubricity of the coating at high temperature, so that the coating can uniformly cover the surface of the workpiece.
Preferably, in order to improve the performance of the decarburization paint, the specific surface area S and the primary grain size d1 of the ultrafine alumina powder satisfy the condition that S.d 1 is not less than 195.6 and not more than 432.5.
Preferably, the invention also discloses a production device of the decarburized coating for the lost foam cast steel, which comprises a tank body, a bracket and a motor; the bottom of the tank body is provided with a bracket, the top of the tank body is provided with a motor, and an output shaft of the motor penetrates through the tank body; a shell is arranged in the tank body and close to the top of the tank body; the motor output shaft penetrates through the shell, the other end of the output shaft is connected with a driving wheel, the driving wheel is a conical gear, two sides of the driving wheel are respectively connected with a first driven wheel in a meshed mode, one side, away from the driving wheel, of the first driven wheel is connected with a transmission rod, the other end of the transmission rod is connected with a second driven wheel, and the second driven wheel is connected with a third driven wheel in a meshed mode; a second stirring shaft is connected to one side of the third driven wheel, which is far away from the second driven wheel, penetrates through the shell and extends into the tank body, and a spiral stirring blade is arranged on the second stirring shaft; the other side of the driving wheel is connected with a first stirring shaft, the first stirring shaft penetrates through the shell, and the other end of the first stirring shaft is connected with stirring teeth; the side surface of the tank body is provided with a powder inlet and a liquid inlet, and the bottom of the tank body is provided with a discharge hole; and a filtering mechanism is arranged in the powder inlet.
Preferably, the filtering mechanism comprises a filter screen and a vibrating mechanism, connecting rods are connected to two sides of the filter screen, and the filter screen is connected with the vibrating mechanism through the connecting rods.
Preferably, the vibration mechanism comprises a vibration motor, the vibration motor is connected with the inner wall of the powder inlet, and the other end of the vibration motor is connected with the connecting rod.
Preferably, the upper side surface and the lower side surface of the vibration motor are both connected with a damping rod, and the other end of the damping rod is connected with the inner wall of the powder inlet; the two ends of the shock absorption rod are fixed rods which are connected through springs.
Preferably, the pore size of the filter screen is in the range of 150-350 meshes.
Preferably, in the production process of the coating, solid powder is added into the tank body from a powder inlet, and larger particles are filtered through a filter screen, so that the quality of the coating is ensured; and adding the binder of the liquid component from the liquid material inlet, turning on a motor to stir, and uniformly stirring to obtain the decarburized coating.
Preferably, the side of the tank body is provided with an access door, so that the internal stirring teeth are convenient to maintain and replace.
In order to ensure that the raw materials are mixed more uniformly, have better physical reaction and achieve better adhesion effect, the diameter D of the tank body ranges from 0.7 m to 3 m; the volume V and the volume D of the tank body satisfy that V/D is more than or equal to 160 and less than or equal to 628;
preferably, the value range of the rotating speed n of the motor is 1000-; the rotating speed n of the motor, the diameter d of the inner tank, the volume V of the tank body and the stirring time t meet the following relations:
D=α·V(n/πt)1/2；
in the above formula, α is a relation factor with the value range of 1.368-7.564;
d is m; n is in rpm; t is in seconds; v has the unit of m3(ii) a Pi is a constant circumference ratio.
Compared with the prior art, the invention has the following beneficial effects:
(1) according to the decarburized coating for the lost foam cast steel, a compact firm protective film capable of isolating a matrix from a heating atmosphere is formed on the surface of a metal during heating, the oxidation and decarburization phenomena of high-speed steel are reduced, other elements can be prevented from permeating, the decarburized coating is convenient to remove after being heated and automatically peels off, the coating has high adhesive force after being coated, and has good stripping performance after being heated, the process cost and the metal consumption are effectively reduced, and the product yield is greatly improved.
(2) The invention relates to a decarburized coating for lost foam cast steel, which adopts high-melting-point oxides of alumina, magnesia and silica as frameworks, wherein the low-melting-point oxides are melted into a film to form a compact glassy coating, so that the contact between a heating atmosphere and a matrix is isolated, the high-temperature stage protection effect is realized, and the protective coating plays a role in protection in a wider temperature range.
(3) According to the decarburized coating for lost foam cast steel, silicon carbide reacts with oxygen at a low temperature stage to generate silicon dioxide, and the silicon dioxide reacts with iron oxide on the surface of a steel piece at a high temperature to generate an (fayalite) easily-peeled ceramic layer; the alumina has high chemical stability, and can improve the heat resistance of the coating; the magnesium oxide can increase the melting temperature of the glass enamel, so that the coating is inert to certain steels and can be automatically peeled off when the workpiece is cooled; the addition of calcium oxide can improve the fluidity and lubricity of the coating at high temperature, so that the coating can uniformly cover the surface of the workpiece.
(4) According to the decarburized coating for lost foam cast steel, the raw materials are stirred more uniformly through the arranged first stirring teeth and the spiral stirring blades, and the production quality of the coating is further improved.
(5) According to the decarburized coating for lost foam cast steel, disclosed by the invention, the relation among n, D, t and V is limited, so that the raw materials are mixed more uniformly, a better physical reaction is realized, a better bonding effect is achieved, and the construction is facilitated.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a graph of the content of a portion of the formulation of the present invention.
Fig. 2 is a schematic cross-sectional structure of the present invention.
Fig. 3 is a schematic diagram of the internal gearing structure of the present invention.
FIG. 4 is a schematic view of the powder inlet of the present invention.
Fig. 5 is an enlarged schematic view of the vibration mechanism of the present invention.
Fig. 6 is a schematic view of the structure of the filter screen of the present invention.
In the figure: 1. a tank body; 2. a support; 3. a motor; 4. a housing; 5. powder material inlet; 6. a liquid material inlet; 7. a first stirring shaft; 8. a second stirring shaft; 9. a helical mixing blade; 10. stirring teeth; 11. a discharge port; 12. an output shaft; 13. a driving wheel; 14. a first driven wheel; 15. a transmission rod; 16. a second driven wheel; 17. a third driven wheel; 18. a filter screen; 19. a vibration motor; 20. a connecting rod; 21. shock-absorbing rod.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described in detail and completely with reference to the accompanying drawings. It is to be understood that the described embodiments are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Example one
As shown in FIG. 1, a decarburization coating for a lost foam cast steel, which comprises a solid component A and a liquid component B; the solid component A comprises the following raw materials in parts by weight: 35 parts of aluminum oxide, 15 parts of silicon carbide, 5 parts of magnesium oxide, 2 parts of calcium oxide and 1 part of nickel sulfate; the liquid component B comprises the following raw materials in parts by weight: 70 parts of a binder.
The solid component A also comprises 8 parts by weight of white mud; the binder is water glass solution.
The raw materials in the solid component A are all powder, and the particle size range of the powder is 350 meshes.
The binder accounts for 12 percent of the total mass fraction.
The main mineral component of the white mud is kaolinite, and the kaolinite contains 46.54 percent of SiO239.5% of Al2O313.96% of H2O。
The alumina can be superfine alumina powder with the primary grain size of 0.6 μm, and the alumina powder contains alumina99.8 percent of sodium oxide, 0.2 percent of silicon dioxide, 0.06 percent of ferric oxide and 4.32g/cm of true specific gravity3。
The mass percentage of SiC in the silicon carbide is 97.5 percent, and the refractoriness of the silicon carbide is more than 1930 ℃.
The coating adopts high-melting-point oxides of alumina, magnesia and silica as a framework, the low-melting-point oxides are melted into a film to form a compact glassy coating, the contact between a heating atmosphere and a substrate is isolated, the protection effect in a high-temperature stage is achieved, and the protection coating plays a role in protection in a wider temperature range.
When the coating is in a low-temperature stage, silicon carbide reacts with oxygen to generate silicon dioxide, and the silicon dioxide reacts with iron oxide on the surface of a steel part at a high temperature to generate an (fayalite) easily-peeled ceramic layer; the alumina has high chemical stability, and can improve the heat resistance of the coating; the magnesium oxide can increase the melting temperature of the glass enamel, so that the coating is inert to certain steels and can be automatically peeled off when the workpiece is cooled; the addition of calcium oxide can improve the fluidity and lubricity of the coating at high temperature, so that the coating can uniformly cover the surface of the workpiece.
Example two
As shown in FIG. 1, a decarburization coating for a lost foam cast steel, which comprises a solid component A and a liquid component B; the solid component A comprises the following raw materials in parts by weight: 20 parts of aluminum oxide, 10 parts of silicon carbide, 2 parts of magnesium oxide, 0.5 part of calcium oxide and 0.5 part of nickel sulfate; the liquid component B comprises the following raw materials in parts by weight: 50 parts of a binder.
The solid component A also comprises 3 parts by weight of white mud; the binder is water glass solution.
The raw materials in the solid component A are all powder, and the particle size range of the powder is 150 meshes.
The binder accounts for 7 percent of the total mass fraction.
The main mineral component of the white mud is kaolinite, and the kaolinite contains 46.54 percent of SiO239.5% of Al2O313.96% of H2O。
The alumina can be aluminaThe superfine aluminum oxide powder has the primary grain size of 0.4 mu m, the content of aluminum oxide in the superfine aluminum oxide powder is 99.8 percent, the content of sodium oxide is 0.2 percent, the content of silicon dioxide is 0.06 percent, the content of ferric oxide in percentage by mass is 0.04 percent, and the true specific gravity is 4.32g/cm3。
The mass percentage of SiC in the silicon carbide is 97.5 percent, and the refractoriness of the silicon carbide is more than 1930 ℃.
The coating adopts high-melting-point oxides of alumina, magnesia and silica as a framework, the low-melting-point oxides are melted into a film to form a compact glassy coating, the contact between a heating atmosphere and a substrate is isolated, the protection effect in a high-temperature stage is achieved, and the protection coating plays a role in protection in a wider temperature range.
When the coating is in a low-temperature stage, silicon carbide reacts with oxygen to generate silicon dioxide, and the silicon dioxide reacts with iron oxide on the surface of a steel part at a high temperature to generate an (fayalite) easily-peeled ceramic layer; the alumina has high chemical stability, and can improve the heat resistance of the coating; the magnesium oxide can increase the melting temperature of the glass enamel, so that the coating is inert to certain steels and can be automatically peeled off when the workpiece is cooled; the addition of calcium oxide can improve the fluidity and lubricity of the coating at high temperature, so that the coating can uniformly cover the surface of the workpiece.
EXAMPLE III
As shown in fig. 2-6, a production device of the decarburized coating for the lost foam cast steel comprises a tank body 1, a bracket 2 and a motor 3; the bottom of the tank body 1 is provided with a bracket 2, the top of the tank body 1 is provided with a motor 3, and an output shaft 12 of the motor 3 penetrates through the tank body 1; a shell 4 is arranged in the tank body 1 and close to the top of the tank body 1; an output shaft 12 of the motor 3 penetrates through the shell 4, the other end of the output shaft 12 is connected with a driving wheel 13, the driving wheel 13 is a conical gear, two sides of the driving wheel 13 are respectively connected with a first driven wheel 14 in a meshed mode, one side, away from the driving wheel 13, of the first driven wheel 14 is connected with a transmission rod 15, the other end of the transmission rod 15 is connected with a second driven wheel 16, and the second driven wheel 16 is connected with a third driven wheel 17 in a meshed mode; a second stirring shaft 8 is connected to one side of the third driven wheel 17, which is far away from the second driven wheel 16, the second stirring shaft 8 penetrates through the shell 4 and extends into the tank body 1, and a spiral stirring blade 9 is arranged on the second stirring shaft 8; the other side of the driving wheel 13 is connected with a first stirring shaft 7, the first stirring shaft 7 penetrates through the shell 4, and the other end of the first stirring shaft 7 is connected with stirring teeth 10; a powder inlet 5 and a liquid inlet 6 are arranged on the side surface of the tank body 1, and a discharge hole 11 is arranged at the bottom of the tank body 1; and a filtering mechanism is arranged in the powder inlet 5.
The filter mechanism comprises a filter screen 18 and a vibration mechanism, wherein connecting rods 20 are connected to two sides of the filter screen 18, and the filter screen 18 is connected with the vibration mechanism through the connecting rods 20.
The vibration mechanism comprises a vibration motor 19, the vibration motor 19 is connected with the inner wall of the powder inlet 5, and the other end of the vibration motor 19 is connected with the connecting rod 20.
The upper side surface and the lower side surface of the vibration motor 19 are both connected with a damping rod 21, and the other end of the damping rod 21 is connected with the inner wall of the powder inlet 5; the two ends of the shock absorption rod 21 are fixed rods which are connected through springs.
The aperture range of the filter screen 18 is 150-350 meshes.
In the production process of the coating, solid powder is added into the tank body 1 from the powder inlet 5, and larger particles are filtered through the filter screen 18, so that the quality of the coating is ensured; and adding the binder of the liquid component from the liquid material inlet 6, turning on the motor 3 to stir, and uniformly stirring to obtain the decarburized coating.
An access door is arranged on the side surface of the tank body 1, so that the internal stirring teeth 10 can be maintained and replaced conveniently.
Example four
On the basis of the third embodiment, in order to enable the raw materials to be mixed more uniformly, play a better role in physical reaction and achieve a better bonding effect, the diameter D of the tank body 1 ranges from 0.7 m to 3 m; the volume V and the volume D of the tank body 1 meet the condition that V/D is more than or equal to 160 and less than or equal to 628;
the value range of the rotating speed n of the motor 3 is 1000-; the rotating speed n of the motor 3, the diameter d of the inner tank, the volume V of the tank body 1 and the stirring time t meet the following relations:
D=α·V(n/πt)1/2；
in the above formula, α is a relation factor with the value range of 1.368-7.564;
d is m; n is in rpm; t is in seconds; v has the unit of m3(ii) a Pi is a constant circumference ratio.
The invention obtains the decarburized coating for the lost foam cast steel and the production device thereof, a layer of compact firm protective film which can isolate a matrix from a heating atmosphere is formed on the surface of a metal when a lost foam cast steel material is heated, the oxidation and decarburization phenomena of high-speed steel are reduced, other elements can be prevented from permeating, the coating is convenient to remove and automatically peels off after being heated, the coating has higher adhesive force after being coated, and has better stripping performance after being heated, the process cost and the metal consumption are effectively reduced, and the product yield is greatly improved.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (8)

1. A decarburizing coating for lost foam cast steel, which is characterized by comprising a component A and a component B; the component A comprises the following raw materials in parts by weight: 20-35 parts of aluminum oxide, 10-15 parts of silicon carbide, 2.2-5 parts of magnesium oxide, 0.5-2 parts of calcium oxide and 0.5-1 part of nickel sulfate; the component B comprises the following raw materials in parts by weight: 50-70 parts of a binder.
2. The decarburization paint for lost foam cast steel as claimed in claim 1, wherein the component A further comprises 3 to 8 parts by weight of white mud; the binder is water glass solution.
3. The decarburization coating for lost foam cast steel as recited in claim 1 or 2, wherein the raw materials of component A are all in powder form, and the particle size of the powder is in the range of 150-350 mesh.
4. A decarburising coating for lost foam cast steel according to any one of claims 1 to 3, characterised in that said binding agent is present in a proportion of 7.2 to 11.2% by mass of the total mass.
5. The decarburization paint for lost foam cast steel as claimed in claim 1, wherein the main mineral component of white mud is kaolinite, which contains 46.54% of SiO239.5% of Al2O313.96% of H2O。
6. The decarburization paint for lost foam cast steel as claimed in claim 1, wherein the component A further comprises 7.7 to 8.2 parts of aluminum powder, 8.4 to 11.3 parts of silica powder and 1.3 to 2.6 parts of graphite powder.
7. The decarburized coating for lost foam casting steel as claimed in claim 1, wherein the aluminum powder, the silicon powder and the graphite powder are fine powders, and the specific surface area S is 330-2/g。
8. The decarburization paint for lost foam cast steel as recited in claim 1, wherein S.d 1 is 195.6-432.5 between the specific surface area S and the primary grain size d1 of the ultrafine alumina powder.
CN202010102840.4A 2020-02-19 2020-02-19 Decarburizing coating for lost foam cast steel Active CN111234574B (en)

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Citations (8)

* Cited by examiner, † Cited by third party
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CN101058684A (en) * 2006-04-21 2007-10-24 中国科学院过程工程研究所 High temperature common mild steel anti-oxidation coating and application thereof
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