CN114523066A - Casting coating and preparation method and use method thereof - Google Patents
Casting coating and preparation method and use method thereof Download PDFInfo
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- CN114523066A CN114523066A CN202210308866.3A CN202210308866A CN114523066A CN 114523066 A CN114523066 A CN 114523066A CN 202210308866 A CN202210308866 A CN 202210308866A CN 114523066 A CN114523066 A CN 114523066A
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- 238000000576 coating method Methods 0.000 title claims abstract description 94
- 239000011248 coating agent Substances 0.000 title claims abstract description 93
- 238000005266 casting Methods 0.000 title claims abstract description 90
- 238000000034 method Methods 0.000 title claims description 14
- 238000002360 preparation method Methods 0.000 title abstract description 12
- 239000000843 powder Substances 0.000 claims abstract description 112
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 27
- 239000000956 alloy Substances 0.000 claims abstract description 27
- 239000002002 slurry Substances 0.000 claims abstract description 27
- 239000006185 dispersion Substances 0.000 claims abstract description 24
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 23
- 239000001267 polyvinylpyrrolidone Substances 0.000 claims abstract description 22
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims abstract description 22
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims abstract description 22
- 239000007787 solid Substances 0.000 claims abstract description 20
- 238000004898 kneading Methods 0.000 claims abstract description 14
- 239000004576 sand Substances 0.000 claims abstract description 14
- 239000007788 liquid Substances 0.000 claims abstract description 12
- 238000002156 mixing Methods 0.000 claims abstract description 9
- 239000000725 suspension Substances 0.000 claims abstract description 9
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 20
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 15
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 10
- 239000000440 bentonite Substances 0.000 claims description 9
- 229910000278 bentonite Inorganic materials 0.000 claims description 9
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 9
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 9
- 229910001634 calcium fluoride Inorganic materials 0.000 claims description 9
- 229910052845 zircon Inorganic materials 0.000 claims description 9
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 claims description 9
- 229910000604 Ferrochrome Inorganic materials 0.000 claims description 7
- 229910000616 Ferromanganese Inorganic materials 0.000 claims description 7
- 229910001309 Ferromolybdenum Inorganic materials 0.000 claims description 7
- 229910000863 Ferronickel Inorganic materials 0.000 claims description 7
- 229910001200 Ferrotitanium Inorganic materials 0.000 claims description 7
- 229910001145 Ferrotungsten Inorganic materials 0.000 claims description 7
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims description 7
- 239000000395 magnesium oxide Substances 0.000 claims description 7
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 7
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 7
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 claims description 6
- 229910052863 mullite Inorganic materials 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 229910052849 andalusite Inorganic materials 0.000 claims description 5
- 229960000892 attapulgite Drugs 0.000 claims description 5
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 5
- 239000000292 calcium oxide Substances 0.000 claims description 5
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 5
- RIVZIMVWRDTIOQ-UHFFFAOYSA-N cobalt iron Chemical compound [Fe].[Co].[Co].[Co] RIVZIMVWRDTIOQ-UHFFFAOYSA-N 0.000 claims description 5
- 229910052593 corundum Inorganic materials 0.000 claims description 5
- 239000010431 corundum Substances 0.000 claims description 5
- 229910052625 palygorskite Inorganic materials 0.000 claims description 5
- 239000010453 quartz Substances 0.000 claims description 5
- JTDPJYXDDYUJBS-UHFFFAOYSA-N quinoline-2-carbohydrazide Chemical compound C1=CC=CC2=NC(C(=O)NN)=CC=C21 JTDPJYXDDYUJBS-UHFFFAOYSA-N 0.000 claims description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 239000004113 Sepiolite Substances 0.000 claims description 3
- 229910001570 bauxite Inorganic materials 0.000 claims description 3
- 150000008280 chlorinated hydrocarbons Chemical class 0.000 claims description 3
- 239000010439 graphite Substances 0.000 claims description 3
- 229910002804 graphite Inorganic materials 0.000 claims description 3
- 239000003973 paint Substances 0.000 claims description 3
- 239000003755 preservative agent Substances 0.000 claims description 3
- 230000002335 preservative effect Effects 0.000 claims description 3
- 229910052624 sepiolite Inorganic materials 0.000 claims description 3
- 235000019355 sepiolite Nutrition 0.000 claims description 3
- 239000002904 solvent Substances 0.000 claims description 3
- 239000004094 surface-active agent Substances 0.000 claims description 3
- 239000013530 defoamer Substances 0.000 claims 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 16
- 229910052742 iron Inorganic materials 0.000 description 8
- 238000004806 packaging method and process Methods 0.000 description 7
- 229910001018 Cast iron Inorganic materials 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 6
- 239000000498 cooling water Substances 0.000 description 6
- 238000007599 discharging Methods 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 238000001035 drying Methods 0.000 description 5
- 238000005275 alloying Methods 0.000 description 4
- 239000001913 cellulose Substances 0.000 description 4
- 229920002678 cellulose Polymers 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 229910001313 Cobalt-iron alloy Inorganic materials 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 239000002518 antifoaming agent Substances 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000004381 surface treatment Methods 0.000 description 2
- 229910000967 As alloy Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000003618 dip coating Methods 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 238000007528 sand casting Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000011573 trace mineral Substances 0.000 description 1
- 235000013619 trace mineral Nutrition 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mold Materials And Core Materials (AREA)
Abstract
The invention discloses a casting coating, which comprises the following components in parts by weight: 100 parts of refractory aggregate, 20-70 parts of carrier liquid, 0.1-50 parts of alloy powder, 0.1-10 parts of polyvinylpyrrolidone, 0.01-10 parts of fluxing agent and 0.01-20 parts of anti-settling agent. The preparation method of the casting coating disclosed by the invention comprises the following steps of: adding the carrier liquid into a dispersion kettle, adding polyvinylpyrrolidone and an anti-settling agent under the dispersion condition, and dispersing for 10-30 minutes to prepare suspension slurry; adding refractory aggregate, alloy powder and a fluxing agent into a mixer, and mixing for 5-15 minutes to obtain solid powder; and introducing the solid powder into a kneader, adding the suspended slurry while kneading, and continuously kneading for 60-120 minutes after the suspended slurry is completely added to prepare the casting coating. The coating for casting disclosed by the invention is applied to the surface of a casting sand mold/core, so that the surface of a casting can be alloyed, the internal structure of the casting is unchanged, the wear resistance of the surface of the casting is effectively improved, and the surface hardness of the casting is improved.
Description
Technical Field
The invention relates to the technical field of coatings, in particular to a coating for casting and a preparation method and a use method thereof.
Background
In the casting industry, castings such as high-chromium cast iron, medium-chromium cast iron, alloy wear-resistant steel and the like have high requirements on the wear resistance of the surface of the castings due to field working conditions. In casting processes, the wear resistance of castings is generally enhanced by three means: the first mode is that the overall mechanical properties of the casting are improved by adjusting the chemical components of the casting, such as the control of the carbon content of a eutectic point, the addition of trace elements during smelting and the like; the second way is to carry out heat treatment on the casting to improve the overall mechanical property of the casting; the third mode is to improve the wear resistance of the surface of the casting through a casting surface treatment process, such as surface carburization, boronization and the like. The first and second ways are to improve the overall performance of the casting, the surface wear resistance of the casting cannot be particularly strengthened, and the method is not suitable for the casting only requiring surface strengthening; the third mode needs a special surface treatment process, is suitable for treating small parts, and has the defects of difficult uniform treatment of the surface and overhigh production cost for castings.
Disclosure of Invention
Based on the above, in order to solve the problem that the wear resistance of the surface of the casting is difficult to improve, the invention provides the casting coating which improves the wear resistance of the surface of the casting, is simple and convenient to use and does not need a special treatment process, and the preparation method and the use method thereof.
In order to solve the technical problems, the invention adopts the following technical scheme:
the casting coating comprises the following components in parts by weight: 100 parts of refractory aggregate, 20-70 parts of carrier liquid, 0.1-50 parts of alloy powder, 0.1-10 parts of polyvinylpyrrolidone, 0.01-10 parts of fluxing agent and 0.01-20 parts of anti-settling agent.
Further, the alloy powder is one or more of ferrochrome powder, ferromolybdenum powder, ferrotungsten powder, ferromanganese powder, ferrocobalt powder, ferrotitanium powder and ferronickel powder.
Further, the mesh number of the alloy powder is 100 to 800 meshes, preferably 400 to 600 meshes.
Further, the casting coating also comprises one or more of a surfactant, a defoaming agent, a preservative and a solvent.
Further, the refractory aggregate is one or more of graphite, zircon powder, corundum powder, mullite, high-alumina, andalusite and quartz powder.
Preferably, the mesh number of the refractory aggregate is 200 to 500 meshes, and most preferably 300 to 400 meshes.
Further, the fluxing agent is one or more of calcium fluoride, calcium oxide, magnesium oxide and sodium hexafluorosilicate.
Further, the carrier liquid is one or more of methanol, ethanol, isopropanol, chlorinated hydrocarbon and water.
Further, the anti-settling agent is one or more of bentonite, attapulgite and sepiolite.
Furthermore, the polyvinylpyrrolidone is nonionic, and the molecular weight of the polyvinylpyrrolidone is 5-50 ten thousand, preferably 10-12 ten thousand.
In addition, the application also provides a preparation method of the coating for casting, which comprises the following steps:
s1, adding a carrier liquid into a dispersion kettle, adding polyvinylpyrrolidone and an anti-settling agent under a dispersion condition, and dispersing for 10-30 minutes to prepare suspension slurry;
s2, adding refractory aggregate, alloy powder and a fluxing agent into a mixer, and mixing for 5-15 minutes to obtain solid powder;
s3, introducing the solid powder into a kneading machine, slowly adding the suspended slurry while kneading, and continuously kneading for 60-120 minutes after the suspended slurry is completely added to prepare the coating for casting;
and S4, detecting and packaging.
Further, the refractory aggregate, the alloy powder and the fluxing agent are sequentially added in sequence.
The use method of any of the above-described foundry paints: applying the foundry coating to the surface of a foundry sand mold and/or foundry core. When pouring, the coating for casting is contacted with high-temperature molten iron or molten steel, so that the surface of the casting is alloyed, an alloying layer is formed on the surface of the casting, and the surface wear resistance of the casting is improved.
Compared with the prior art, the method of the invention has the following beneficial effects:
the coating for casting disclosed by the invention is applied to a casting sand mold/sand core, so that the surface of a casting can be alloyed, the internal structure of the casting is unchanged, the wear resistance of the surface of the casting is effectively improved, and the surface hardness of the casting is also improved. Compared with the prior art, the casting coating disclosed by the invention is simple and convenient to use, can improve the wear resistance of the surface of a casting without adding other process flows, effectively reduces the production cost, and has uniform thickness of the alloying layer at each part of the surface of the casting.
Detailed Description
In order that the invention may be more fully understood, reference will now be made to the accompanying examples. The preferred embodiments of the present invention are given in the examples. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The invention discloses a casting coating, which comprises the following components in parts by weight: 100 parts of refractory aggregate, 20-70 parts of carrier liquid, 0.1-50 parts of alloy powder, 0.1-10 parts of polyvinylpyrrolidone, 0.01-10 parts of fluxing agent and 0.01-20 parts of anti-settling agent. The refractory aggregate is a high-temperature refractory material, can isolate molten iron, molten steel, sand mold and sand core, and has the effects of resisting sand adhesion and promoting the stripping of the coating; the refractory aggregate can be one or more of graphite, zircon powder, corundum powder, mullite, high-alumina, andalusite and quartz powder; the mesh number of the refractory aggregate may be 200 to 500 meshes, preferably 300 to 400 meshes. The carrier liquid may be one or more of methanol, ethanol, isopropanol, chlorinated hydrocarbon, water, and serves as a dispersing carrier for the components of the coating to promote the formation of a uniformly viscous mass that facilitates application of the casting coating. The alloy powder is iron-containing alloy powder, and specifically can be one or more of ferrochrome powder, ferromolybdenum powder, ferrotungsten powder, ferromanganese powder, ferrocobalt powder, ferrotitanium powder and ferronickel powder; the mesh number of the alloy powder is 100-800 meshes, preferably 400-600 meshes; the alloy powder can make the surface of the casting produce alloying reaction, when pouring, the coating for casting is contacted with high-temperature molten iron or molten steel, the alloy powder in the coating is melted, and the alloy elements are migrated into the molten iron or molten steel on the surface of the casting and react with the molten iron or molten steel on the surface of the casting to form an alloying layer. The polyvinylpyrrolidone is nonionic, the molecular weight can be 5-50 ten thousand, and preferably 10-12 ten thousand; the polyvinylpyrrolidone is used as the binder of the coating, so that the solid particles are bonded together to form a coating with certain strength after the coating is dried. The fluxing agent can be one or more of calcium fluoride, calcium oxide, magnesium oxide and sodium hexafluorosilicate, reduces the melting point of the alloy powder and promotes the tendency of the alloy powder to react with the effective components in the molten iron at the pouring temperature. The anti-settling agent can be one or more of bentonite, attapulgite and sepiolite, so that the materials are mixed to form a uniform material mixture, and heavy solid components such as alloy powder, refractory aggregate and the like are prevented from settling.
Furthermore, the casting coating disclosed by the invention can also comprise auxiliary materials such as a surfactant, a defoaming agent, a preservative, a solvent and the like to optimize and modify the performance of the coating.
In a second aspect, the invention also discloses a preparation method of the coating for casting, which comprises the following steps:
s1, starting a motor of a multifunctional coating high-speed dispersion kettle, adding a carrier liquid into the multifunctional coating high-speed dispersion kettle, adding polyvinylpyrrolidone and an anti-settling agent under the dispersion condition of 1000rpm, and dispersing at a high speed for 10-30 minutes after the addition is finished to prepare suspension slurry;
s2, starting a motor of the spiral mixer, sequentially adding refractory aggregate, alloy powder and a fluxing agent into the spiral mixer, and mixing for 5-15 minutes to obtain solid powder;
s3, opening a cooling water valve of the kneader, opening a motor of the kneader, introducing the solid powder prepared in the step S2 into the kneader, slowly adding the suspended slurry prepared in the step S1 while kneading, and continuously kneading for 60-120 minutes after the suspended slurry is completely added to prepare the coating for casting;
and S4, discharging, detecting and packaging.
Further, a method for using the casting paint according to any of the above aspects, comprising the steps of:
s1, diluting a casting coating, wherein the casting coating can be diluted by water and/or ethanol, and the type of carrier liquid of the casting coating is not required to be considered;
s2, uniformly coating the diluted casting coating on the surface of the casting sand mold or sand core, specifically coating the diluted casting coating on the surface of the sand mold or sand core by adopting modes of brushing, flow coating, spraying or dip coating and the like, and also coating for one time or multiple times, wherein the coating is not specifically required, and the coating thickness is only 0.05-0.2 mm;
s3, drying the coating, wherein the drying mode can adopt ignition drying or drying, and the drying mode can be a hot air or microwave mode;
and S4, assembling the box, pouring and boxing.
Further, the coating without the alloy powder can be uniformly coated on the surface of the casting sand mold or the sand core, the coating thickness of the coating without the alloy powder can be 0.2 mm-0.8 mm, and then the coating for casting disclosed by the invention is coated. The coating without the alloy powder coating can separate the casting sand mold and the sand core from the coating of the casting coating disclosed by the invention, so that the alloy powder in the casting coating disclosed by the invention is prevented from being molten and adhered to the casting sand mold or the sand core during pouring.
Preferably, the Baume degree of the casting coating after dilution in the step S1 is 40-70 DEG Be.
Example one
A foundry coating comprising: 1000kg zircon powder, 300kg ethanol, 100kg ferrochrome powder, 50kg polyvinylpyrrolidone, 50kg calcium fluoride and 200kg bentonite.
The preparation method of the coating for casting described in this embodiment includes the following steps:
s1, starting a motor of a multifunctional coating high-speed dispersion kettle, adding 300kg of ethanol into the multifunctional coating high-speed dispersion kettle, adding 50kg of polyvinylpyrrolidone and 200kg of bentonite under the dispersion condition of 1000rpm, and dispersing at a high speed for 20 minutes after the addition is finished to obtain suspension slurry;
s2, starting a motor of a spiral mixer, sequentially adding 1000kg of zircon powder, 100kg of ferrochrome powder and 50kg of calcium fluoride into the spiral mixer, and mixing for 10 minutes to obtain solid powder;
s3, opening a cooling water valve of the kneader, starting a motor of the kneader, introducing the solid powder prepared in the step S2 into the kneader, slowly adding the suspended slurry prepared in the step S1 while kneading, and continuing to knead for 90 minutes after the suspended slurry is completely added to prepare the coating for casting in the embodiment;
and S4, discharging, detecting and packaging.
Example two
A foundry coating comprising: 1000kg of corundum powder, 400kg of water, 100kg of ferromolybdenum alloy powder, 50kg of polyvinylpyrrolidone, 50kg of calcium fluoride and 100kg of attapulgite.
The preparation method of the coating for casting described in this embodiment includes the following steps:
s1, starting a motor of a multifunctional coating high-speed dispersion kettle, adding 400kg of water into the multifunctional coating high-speed dispersion kettle, adding 50kg of polyvinylpyrrolidone and 100kg of attapulgite under the dispersion condition of 1000rpm, and dispersing at a high speed for 20 minutes after the addition is finished to obtain suspension slurry;
s2, starting a motor of a spiral mixer, sequentially adding 1000kg of corundum powder, 100kg of ferromolybdenum powder and 50kg of calcium fluoride into the spiral mixer, and mixing for 10 minutes to obtain solid powder;
s3, opening a cooling water valve of the kneader, starting a motor of the kneader, introducing the solid powder prepared in the step S2 into the kneader, slowly adding the suspended slurry prepared in the step S1 while kneading, and continuing to knead for 90 minutes after the suspended slurry is completely added to prepare the coating for casting in the embodiment;
and S4, discharging, detecting and packaging.
EXAMPLE III
A foundry coating comprising: 500kg of zircon powder, 500kg of mullite, 200kg of methanol, 200kg of isopropanol, 50kg of ferrotungsten powder, 50kg of ferromanganese powder, 80kg of polyvinylpyrrolidone, 100kg of calcium fluoride and 150kg of bentonite.
The preparation method of the coating for casting described in this embodiment includes the following steps:
s1, starting a motor of a multifunctional coating high-speed dispersion kettle, adding 200kg of methanol and 200kg of isopropanol into the multifunctional coating high-speed dispersion kettle, adding 80kg of polyvinylpyrrolidone and 150kg of bentonite under the dispersion condition of 1000rpm, and dispersing at a high speed for 20 minutes after the addition is finished to obtain suspension slurry;
s2, starting a motor of the spiral mixer, sequentially adding 500kg of zircon powder, 500kg of mullite, 50kg of ferrotungsten powder, 50kg of ferromanganese powder and 100kg of calcium fluoride into the spiral mixer, and mixing for 10 minutes to obtain solid powder;
s3, opening a cooling water valve of the kneader, starting a motor of the kneader, introducing the solid powder prepared in the step S2 into the kneader, slowly adding the suspended slurry prepared in the step S1 while kneading, and continuing to knead for 90 minutes after the suspended slurry is completely added to prepare the coating for casting in the embodiment;
and S4, discharging, detecting and packaging.
Example four
A foundry coating comprising: 1000kg of high bauxite, 300kg of chlorohydrocarbon, 60kg of cobalt-iron alloy powder, 30kg of ferrotitanium powder, 30kg of ferronickel powder, 100kg of polyvinylpyrrolidone, 50kg of magnesium oxide, 50kg of sodium hexafluorosilicate and 50kg of cellulose.
The preparation method of the coating for casting described in this embodiment includes the following steps:
s1, starting a motor of a multifunctional coating high-speed dispersion kettle, adding 300kg of chlorohydrocarbon into the multifunctional coating high-speed dispersion kettle, adding 100kg of polyvinylpyrrolidone and 50kg of cellulose under the dispersion condition of 1000rpm, and dispersing at a high speed for 20 minutes after the addition is finished to obtain suspension slurry;
s2, starting a motor of the spiral mixer, sequentially adding 1000kg of high bauxite, 60kg of cobalt-iron alloy powder, 30kg of ferrotitanium powder, 30kg of ferronickel powder, 50kg of magnesium oxide and 50kg of sodium hexafluorosilicate into the spiral mixer, and mixing for 10 minutes to obtain solid powder;
s3, opening a cooling water valve of the kneader, starting a motor of the kneader, introducing the solid powder prepared in the step S2 into the kneader, slowly adding the suspended slurry prepared in the step S1 while kneading, and continuing to knead for 90 minutes after the suspended slurry is completely added to prepare the coating for casting in the embodiment;
and S4, discharging, detecting and packaging.
EXAMPLE five
A foundry coating comprising: 100kg zircon powder, 200kg andalusite, 700kg quartz powder, 500kg ethanol, 30kg ferrochrome powder, 20kg ferromolybdenum powder, 10kg ferrotungsten powder, 10kg ferromanganese powder, 10kg ferrocobalt powder, 10kg ferrotitanium powder, 5kg ferronickel powder, 50kg polyvinylpyrrolidone, 20kg calcium oxide, 50kg magnesium oxide, 100kg bentonite, and 20kg cellulose.
The preparation method of the coating for casting described in this embodiment includes the following steps:
s1, starting a motor of a multifunctional coating high-speed dispersion kettle, adding 500kg of ethanol into the multifunctional coating high-speed dispersion kettle, adding 50kg of polyvinylpyrrolidone, 100kg of bentonite and 20kg of cellulose under the dispersion condition of 1000rpm, and dispersing at a high speed for 20 minutes after the addition is finished to obtain suspension slurry;
s2, starting a motor of the spiral mixer, sequentially adding 100kg of zircon powder, 200kg of andalusite, 700kg of quartz powder, 30kg of ferrochrome powder, 20kg of ferromolybdenum powder, 10kg of ferrotungsten powder, 10kg of ferromanganese powder, 10kg of ferrocobalt powder, 10kg of ferrotitanium powder, 5kg of ferronickel powder, 20kg of calcium oxide and 50kg of magnesium oxide into the spiral mixer, and mixing for 10 minutes to obtain solid powder;
s3, opening a cooling water valve of the kneader, starting a motor of the kneader, introducing the solid powder prepared in the step S2 into the kneader, slowly adding the suspended slurry prepared in the step S1 while kneading, and continuing to knead for 90 minutes after the suspended slurry is completely added to prepare the coating for casting in the embodiment;
and S4, discharging, detecting and packaging.
And (3) uniformly applying the alcohol-based mullite powder casting coating on the surfaces of six test block sand molds with same materials and specifications, wherein one sand mold is taken as a comparative example, and the rest five sand molds are respectively coated with the casting coating prepared in the first to fifth embodiments and dried, and are poured by molten iron in the same furnace to obtain the corresponding cast iron test blocks. The hardness of the cast iron test block was measured by using an MH-3 microhardness tester, and the impact wear properties of the cast iron test block were measured by using an MLD-10 type dynamic-load abrasive wear tester with impact powers of 1J, 2J, and 4J, respectively, and the test results are shown in Table 1. From the detection results, the surface hardness of the casting sample subjected to sand casting and coated by the coating for casting disclosed by the invention is increased to a certain extent, and the impact wear rate of the sample is reduced obviously. The reduction of the impact wear rate of the pouring sample shows that the casting coating disclosed by the invention has the effect of obviously improving the surface wear resistance of the casting.
TABLE 1 test results of cast iron test blocks
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The casting coating is characterized by comprising the following components in parts by weight: 100 parts of refractory aggregate, 20-70 parts of carrier liquid, 0.1-50 parts of alloy powder, 0.1-10 parts of polyvinylpyrrolidone, 0.01-10 parts of fluxing agent and 0.01-20 parts of anti-settling agent.
2. The coating for casting according to claim 1, wherein the alloy powder is one or more of ferrochrome powder, ferromolybdenum powder, ferrotungsten powder, ferromanganese powder, ferrocobalt powder, ferrotitanium powder, and ferronickel powder.
3. The casting paint according to claim 2, wherein the mesh number of the alloy powder is 100 to 800 meshes.
4. The foundry coating of claim 1, further comprising one or more of a surfactant, a defoamer, a preservative, a solvent.
5. The foundry coating of claim 1, wherein the refractory aggregate is one or more of graphite, zircon powder, corundum powder, mullite, bauxite, andalusite, and quartz powder.
6. The foundry coating of claim 1, wherein the fluxing agent is one or more of calcium fluoride, calcium oxide, magnesium oxide, and sodium hexafluorosilicate.
7. The foundry coating of claim 1, wherein the carrier liquid is one or more of methanol, ethanol, isopropanol, chlorinated hydrocarbon, water.
8. The foundry coating of claim 1, wherein the anti-settling agent is one or more of bentonite, attapulgite, sepiolite.
9. A method for preparing the foundry coating of any one of claims 1 to 8, including the steps of:
adding the carrier liquid into a dispersion kettle, adding polyvinylpyrrolidone and an anti-settling agent under the dispersion condition, and dispersing for 10-30 minutes to prepare suspension slurry;
adding refractory aggregate, alloy powder and a fluxing agent into a mixer, and mixing for 5-15 minutes to obtain solid powder;
and introducing the solid powder into a kneader, slowly adding the suspended slurry while kneading, and continuously kneading for 60-120 minutes after the suspended slurry is completely added to prepare the casting coating.
10. A method of using a foundry coating as claimed in any one of claims 1 to 8, wherein the foundry coating is applied to the surface of a foundry sand mold and/or foundry core.
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| CN202210308866.3A CN114523066B (en) | 2022-03-28 | Coating for casting and preparation method and application method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210308866.3A CN114523066B (en) | 2022-03-28 | Coating for casting and preparation method and application method thereof |
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| CN114523066A true CN114523066A (en) | 2022-05-24 |
| CN114523066B CN114523066B (en) | 2024-07-02 |
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| US3450189A (en) * | 1966-08-22 | 1969-06-17 | Int Nickel Co | Process of coating metal castings |
| SU1708496A1 (en) * | 1989-01-09 | 1992-01-30 | Московский автомеханический институт | Method for depositing pulverulent coating to a casting mold or core |
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