CN108299873B - An insulating anti-oxidation coating for electroslag casting - Google Patents
An insulating anti-oxidation coating for electroslag casting Download PDFInfo
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- 238000005266 casting Methods 0.000 title claims abstract description 36
- 239000011248 coating agent Substances 0.000 title claims abstract description 34
- 238000000576 coating method Methods 0.000 title claims abstract description 34
- 230000003064 anti-oxidating effect Effects 0.000 title claims abstract description 19
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 16
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims abstract description 16
- 229910001634 calcium fluoride Inorganic materials 0.000 claims abstract description 16
- 239000000843 powder Substances 0.000 claims abstract description 16
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 15
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 14
- 239000011230 binding agent Substances 0.000 claims abstract description 12
- 239000002904 solvent Substances 0.000 claims abstract description 12
- 239000000375 suspending agent Substances 0.000 claims abstract description 12
- 238000004519 manufacturing process Methods 0.000 claims abstract description 6
- 238000002156 mixing Methods 0.000 claims abstract description 6
- 238000003756 stirring Methods 0.000 claims description 16
- 239000003973 paint Substances 0.000 claims description 11
- 229910052582 BN Inorganic materials 0.000 claims description 6
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical group N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims description 6
- ONCZQWJXONKSMM-UHFFFAOYSA-N dialuminum;disodium;oxygen(2-);silicon(4+);hydrate Chemical compound O.[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Na+].[Na+].[Al+3].[Al+3].[Si+4].[Si+4].[Si+4].[Si+4] ONCZQWJXONKSMM-UHFFFAOYSA-N 0.000 claims description 6
- 239000003822 epoxy resin Substances 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- 229920000647 polyepoxide Polymers 0.000 claims description 6
- 229940080314 sodium bentonite Drugs 0.000 claims description 6
- 229910000280 sodium bentonite Inorganic materials 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 238000002360 preparation method Methods 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 241000870659 Crassula perfoliata var. minor Species 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 238000005260 corrosion Methods 0.000 claims description 3
- 239000002356 single layer Substances 0.000 claims description 3
- 239000002932 luster Substances 0.000 claims description 2
- 239000002994 raw material Substances 0.000 claims 1
- 239000002893 slag Substances 0.000 abstract description 7
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 abstract description 4
- 230000008018 melting Effects 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 239000000945 filler Substances 0.000 description 3
- 238000010309 melting process Methods 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910000975 Carbon steel Inorganic materials 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000010962 carbon steel Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000002844 melting Methods 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
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000011253 protective coating Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- C—CHEMISTRY; METALLURGY
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/38—Boron-containing compounds
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- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
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- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
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Abstract
本发明的目的在于提供一种电渣熔铸生产过程中涂覆在自耗电极、结晶器内壁表面的绝缘、高温防氧化涂料，所述涂料是由氧化铝粉、氟化钙、抗氧化剂、粘结剂、悬浮剂、溶剂混合配制而成，其质量比为，氟化钙：氧化铝粉：抗氧化剂：粘结剂：悬浮剂：溶剂＝1.8‑2.2:4.5‑5.5:0.4‑0.6:0.7‑1.3:0.4‑0.6:2‑4。该涂料能够减弱自耗电极在渣池高温烘烤下产生氧化铁的趋势，并能够有效防止安全间隙过小情况下，电极与结晶器接触短路产生电弧损坏结晶器的情况。The purpose of the present invention is to provide an insulating and high-temperature anti-oxidation coating applied to the consumable electrode and the inner wall surface of the mold in the production process of electroslag casting. The coating is composed of alumina powder, calcium fluoride, antioxidant, It is prepared by mixing binder, suspending agent and solvent, and its mass ratio is: calcium fluoride: alumina powder: antioxidant: binder: suspending agent: solvent=1.8‑2.2:4.5‑5.5:0.4‑0.6: 0.7‑1.3:0.4‑0.6:2‑4. The coating can reduce the tendency of the consumable electrode to produce iron oxide under the high temperature baking of the slag pool, and can effectively prevent the arc damage to the mold caused by the short circuit between the electrode and the mold when the safety gap is too small.
Description
技术领域technical field
本发明涉及一种极大宽厚比异形板坯电渣熔铸生产过程中在自耗电极表面使用的高温保护涂料，具体提供一种应用于电渣熔铸行业的电极表面高温绝缘防氧化涂料及其制备方法。The invention relates to a high-temperature protective coating used on the surface of a consumable electrode during the electroslag casting production process of a special-shaped slab with a large width-to-thickness ratio, and specifically provides a high-temperature insulating anti-oxidation coating on the electrode surface used in the electroslag casting industry and the same Preparation.
背景技术Background technique
电渣熔铸以精炼和凝固双优特长，成为高品质铸件的重要生产方法。在电渣熔铸过程中，电极埋入高温渣池中，渣池中心温度达1700～1900℃，熔渣表面外的部分电极容易被氧化，在电极表面形成氧化皮，随着电极下移，氧化皮被带入渣中，再通过扩散进入钢中，增加了钢的氧含量，且分布不均匀，降低了电渣熔铸件的冶金纯净度。Electroslag casting has become an important production method for high-quality castings due to its advantages of refining and solidification. During the electroslag casting process, the electrodes are buried in the high-temperature slag pool, and the temperature in the center of the slag pool reaches 1700-1900°C. Part of the electrodes outside the slag surface is easily oxidized, and an oxide scale is formed on the electrode surface. The skin is brought into the slag, and then enters the steel through diffusion, which increases the oxygen content of the steel, and the distribution is uneven, which reduces the metallurgical purity of the electroslag casting.
另外，对于大宽厚比异形板坯的电渣熔铸，局部位置安全间隙小，伴随熔铸过程的进行，极易发生电极与结晶器接触短路进而产生电弧损坏结晶器，使熔铸过程被迫结束而造成废品的情况。In addition, for the electroslag casting of special-shaped slabs with large aspect ratios, the safety gap at the local position is small. With the progress of the melting and casting process, it is very easy to cause a short circuit between the electrode and the mold, resulting in arc damage to the mold, and the casting process is forced to end. the situation of waste.
发明内容SUMMARY OF THE INVENTION
本发明的目的在于提供一种电渣熔铸生产过程中涂覆在自耗电极、结晶器内壁表面的高温防氧化抗腐蚀涂料，该涂料能够减弱自耗电极在渣池高温烘烤下产生氧化铁的趋势，并能够有效防止安全间隙过小情况下，电极与结晶器接触短路产生电弧损坏结晶器的情况。The purpose of the present invention is to provide a kind of high-temperature anti-oxidation and anti-corrosion paint coated on the surface of the consumable electrode and the inner wall of the mold during the production process of electroslag casting, which can reduce the generation of the consumable electrode under the high temperature baking of the slag pool. The trend of iron oxide, and can effectively prevent the situation of arc damage to the mold caused by the short circuit between the electrode and the mold when the safety gap is too small.
本发明采用的技术方案是：The technical scheme adopted in the present invention is:
一种电渣熔铸用绝缘抗氧化涂料，其特征在于：所述涂料是由氧化铝粉、氟化钙、抗氧化剂、粘结剂、悬浮剂、溶剂混合配制而成；An insulating anti-oxidation coating for electroslag casting, characterized in that the coating is prepared by mixing alumina powder, calcium fluoride, antioxidant, binder, suspending agent and solvent;
其质量比为，氟化钙：氧化铝粉：抗氧化剂：粘结剂：悬浮剂：溶剂＝1.8-2.2：4.5-5.5：0.4-0.6：0.7-1.3：0.4-0.6：2-4。优选配比为氟化钙：氧化铝粉：抗氧化剂：粘结剂：悬浮剂：溶剂＝2：5：0.5：1：0.5：3。采用该优选配比制备的涂料，在U＝100v、小安全间隙下，绝缘及抗氧化性能良好。The mass ratio is: calcium fluoride: alumina powder: antioxidant: binder: suspending agent: solvent = 1.8-2.2: 4.5-5.5: 0.4-0.6: 0.7-1.3: 0.4-0.6: 2-4. The preferred ratio is calcium fluoride: alumina powder: antioxidant: binder: suspending agent: solvent=2:5:0.5:1:0.5:3. The coating prepared by adopting the optimal ratio has good insulation and anti-oxidation performance under U=100v and small safety gap.
其中，所述氧化铝粉的粒度≤15μm，氟化钙的粒度≤50μm，抗氧化剂的粒度≤5μm。Wherein, the particle size of the alumina powder is less than or equal to 15 μm, the particle size of calcium fluoride is less than or equal to 50 μm, and the particle size of the antioxidant is less than or equal to 5 μm.
本发明所述电渣熔铸用绝缘抗氧化涂料，其特征在于：所述抗氧化剂为氮化硼，所述粘结剂为环氧树脂，所述悬浮剂为工业品钠基膨润土，所述溶剂为水。The insulating anti-oxidation coating for electroslag casting of the present invention is characterized in that: the antioxidant is boron nitride, the binder is epoxy resin, the suspending agent is industrial sodium bentonite, and the solvent for water.
本发明所述电渣熔铸用绝缘抗氧化涂料的制备方法为：将溶剂放入带搅拌器的容器内，低速(优选10-40rpm)搅拌，搅拌的同时加入悬浮剂，高速(优选60-80rpm)搅拌均匀，再加入粘结剂，继续搅拌均匀后，依次加入氟化钙、氧化铝粉、抗氧化剂充分搅拌均匀，即得。The preparation method of the insulating anti-oxidative coating for electroslag casting according to the present invention is as follows: put a solvent into a container with a stirrer, stir at a low speed (preferably 10-40 rpm), add a suspending agent while stirring, and stir at a high speed (preferably 60-80 rpm). ) and stir evenly, then add the binder, and after continuing to stir evenly, add calcium fluoride, alumina powder, and antioxidants in sequence, and stir well to obtain the result.
本发明所述电渣熔铸用绝缘抗氧化涂料用于电渣熔铸生产过程中涂覆在自耗电极及结晶器内壁表面以实现高温防氧化抗腐蚀的作用，具体使用方法为：The insulating anti-oxidation coating for electroslag casting of the present invention is used to coat the consumable electrode and the inner wall surface of the crystallizer in the production process of electroslag casting to realize the effect of high temperature oxidation resistance and corrosion resistance, and the specific use method is as follows:
1)、自耗电极及结晶器铜板表面打磨至金属光泽，涂料搅拌均匀；1) The surface of the consumable electrode and the copper plate of the crystallizer shall be polished to metallic luster, and the coating shall be stirred evenly;
2)、采用涂料刷将涂料涂覆在自耗电极及结晶器表面，单层厚度小于1mm，涂覆之后，采用火焰或入炉烘烤(优选200℃)至涂料凝固；2) Use a paint brush to coat the paint on the surface of the consumable electrode and the crystallizer, and the thickness of the single layer is less than 1mm. After coating, use a flame or bake in a furnace (preferably 200 ° C) until the paint solidifies;
3)、重复步骤2)，至电极及结晶器表面涂层厚度为2-4mm，既得。3), repeat step 2) until the thickness of the electrode and the surface coating of the crystallizer is 2-4mm, which is obtained.
本发明所述绝缘抗氧化涂料能够有效减少渣池不稳定氧化物含量，从而改善铸件的冶金质量，并能够消除电极与结晶器接触短路现象，从而提高熔铸过程的稳定性。The insulating anti-oxidation coating of the invention can effectively reduce the content of unstable oxides in the slag pool, thereby improving the metallurgical quality of the casting, and can eliminate the short-circuit phenomenon in contact between the electrode and the mold, thereby improving the stability of the melting and casting process.
具体实施方式Detailed ways
实施例1Example 1
一种电渣熔铸用绝缘抗氧化涂料，是由填料氟化钙、氧化铝粉、氮化硼、环氧树脂、工业品钠基膨润土、水混合配制而成，其质量配比为1.8：4.5：0.4：0.7：0.4：2。An insulating anti-oxidation coating for electroslag casting is prepared by mixing filler calcium fluoride, alumina powder, boron nitride, epoxy resin, industrial sodium bentonite and water, and its mass ratio is 1.8:4.5 :0.4:0.7:0.4:2.
配制方法为：将水放入带搅拌器的容器内，低速(40rpm)搅拌，搅拌的同时加入工业品钠基膨润土，高速(80rpn)搅拌均匀，再加入环氧树脂，继续搅拌均匀后，依次加入氟化钙、氧化铝粉、氮化硼充分搅拌均匀，即得。The preparation method is as follows: put water into a container with a stirrer, stir at low speed (40rpm), add industrial sodium bentonite while stirring, stir evenly at high speed (80rpn), then add epoxy resin, continue to stir evenly, and sequentially Add calcium fluoride, alumina powder and boron nitride and stir well to get it.
将所得涂料采用涂料刷涂覆于20mm厚碳钢板表面，单层厚度小于1mm，涂覆之后，采用火焰烘烤至涂料凝固，再反复涂覆至碳钢板表面涂层厚度为3mm，采用手工电弧焊进行短路试验(U＝45v)，未发生击穿。The obtained paint was applied on the surface of a 20mm thick carbon steel plate with a paint brush, and the thickness of a single layer was less than 1mm. After coating, the paint was baked with a flame until the paint solidified, and then repeatedly applied until the surface coating thickness of the carbon steel plate was 3mm, and a manual arc was used. Weld short-circuit test (U=45v), no breakdown occurred.
实施例2Example 2
一种电渣熔铸用绝缘抗氧化涂料，是由填料氟化钙、氧化铝粉、氮化硼、环氧树脂、工业品钠基膨润土、水混合配制而成，其质量配比为2.2：5.5：0.6：1.3：0.6：4。An insulating anti-oxidation coating for electroslag casting is prepared by mixing filler calcium fluoride, alumina powder, boron nitride, epoxy resin, industrial sodium bentonite and water, and its mass ratio is 2.2:5.5 :0.6:1.3:0.6:4.
将配制好的涂料按实施例1的方法涂覆于某产品自耗电极表面及结晶器表面，熔铸过程中将自耗电极与结晶器铜板接触(给定熔铸电压U＝100v)，未发生短路现象，熔铸过程稳定进行，产品常规化学成分及力学性能与未涂覆涂料产品一致，氧含量由电极的130ppm，降至80ppm，产品冶金质量得到提高。Apply the prepared paint on the surface of the consumable electrode of a product and the surface of the mold according to the method of Example 1. During the casting process, the consumable electrode is contacted with the copper plate of the mold (given the casting voltage U=100v), no A short circuit occurs, the casting process is stable, the conventional chemical composition and mechanical properties of the product are consistent with those of the uncoated paint product, the oxygen content is reduced from 130ppm of the electrode to 80ppm, and the metallurgical quality of the product is improved.
实施例3Example 3
一种电渣熔铸用绝缘抗氧化涂料，是由填料氟化钙、氧化铝粉、氮化硼、环氧树脂、工业品钠基膨润土、水混合配制而成，其质量配比为2：5：0.5：1：0.5：3。An insulating anti-oxidation coating for electroslag casting is prepared by mixing filler calcium fluoride, alumina powder, boron nitride, epoxy resin, industrial sodium bentonite and water, and its mass ratio is 2:5 :0.5:1:0.5:3.
将配制好的涂料按实施例1的方法涂覆于大宽厚比板坯自耗电极及结晶器表面，熔铸过程稳定进行(给定熔铸电压U＝80v-130v)，氧含量由电极的115ppm，降至70ppm。产品冶金质量得到提高。The prepared coating was applied to the slab consumable electrode and the surface of the mold with a large aspect ratio according to the method of Example 1. The melting and casting process was carried out stably (the given melting and casting voltage U=80v-130v), and the oxygen content was increased by 115ppm of the electrode. , down to 70ppm. The metallurgical quality of the product is improved.
上述实施例只为说明本发明的技术构思及特点，其目的在于让熟悉此项技术的人士能够了解本发明的内容并据以实施，并不能以此限制本发明的保护范围。凡根据本发明精神实质所作的等效变化或修饰，都应涵盖在本发明的保护范围之内。The above-mentioned embodiments are only intended to illustrate the technical concept and characteristics of the present invention, and the purpose thereof is to enable those who are familiar with the art to understand the content of the present invention and implement them accordingly, and cannot limit the protection scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention should be included within the protection scope of the present invention.
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| CN1035835A (en) * | 1988-03-16 | 1989-09-27 | 中国科学院化工冶金研究所 | Antioxidant protective paint for carbon product |
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| CN103642284A (en) * | 2013-12-12 | 2014-03-19 | 江西恒大高新技术股份有限公司 | High-temperature anti-oxidation coating of high-temperature graphite electrode |
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| CN1035835A (en) * | 1988-03-16 | 1989-09-27 | 中国科学院化工冶金研究所 | Antioxidant protective paint for carbon product |
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| CN102430703A (en) * | 2011-12-27 | 2012-05-02 | 沈阳铸造研究所 | An anti-carburization coating for ultra-low carbon stainless steel castings |
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