CN116815095A - 抗结焦复合涂层及其制备方法 - Google Patents
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- 239000011248 coating agent Substances 0.000 title claims abstract description 30
- 238000000576 coating method Methods 0.000 title claims abstract description 30
- 239000002131 composite material Substances 0.000 title claims abstract description 27
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 238000007747 plating Methods 0.000 claims abstract description 39
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 31
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 31
- 238000003756 stirring Methods 0.000 claims abstract description 28
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 27
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 27
- 239000000956 alloy Substances 0.000 claims abstract description 27
- 239000011777 magnesium Substances 0.000 claims abstract description 21
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 20
- 229910052796 boron Inorganic materials 0.000 claims abstract description 20
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 20
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 16
- 239000010959 steel Substances 0.000 claims abstract description 16
- 229910000676 Si alloy Inorganic materials 0.000 claims abstract description 13
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000003723 Smelting Methods 0.000 claims abstract description 10
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 10
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- 238000007254 oxidation reaction Methods 0.000 claims description 13
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 11
- 244000137852 Petrea volubilis Species 0.000 claims description 9
- 239000002344 surface layer Substances 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 5
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- 238000011010 flushing procedure Methods 0.000 claims description 4
- 238000000227 grinding Methods 0.000 claims description 4
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 239000004570 mortar (masonry) Substances 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- 238000009210 therapy by ultrasound Methods 0.000 claims description 4
- 238000007654 immersion Methods 0.000 claims 2
- 238000005498 polishing Methods 0.000 claims 1
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- 229910010293 ceramic material Inorganic materials 0.000 abstract description 2
- 238000012545 processing Methods 0.000 abstract description 2
- 229910052582 BN Inorganic materials 0.000 abstract 1
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- 230000000694 effects Effects 0.000 abstract 1
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- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 abstract 1
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- 238000005266 casting Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 238000005269 aluminizing Methods 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/12—Aluminium or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
- C22B9/10—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals with refining or fluxing agents; Use of materials therefor, e.g. slagging or scorifying agents
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
- C23C8/24—Nitriding
- C23C8/26—Nitriding of ferrous surfaces
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Abstract
本发明涉及复合材料技术领域,尤其涉及一种抗结焦复合涂层及其制备方法。将机械抛光后的钢材在N2、H2混合气体中进行热浸镀。合金镀液组成为:铝:硅:镁:硼:87‑92.5:6‑8:0.5‑2:1‑3。先向熔炼炉中加入铝硅合金,待其熔融后加入预热的铝锭,加入精炼剂并充分搅拌,保温;将铝箔包裹好的纯镁、硼快速加入熔池中;分5次搅拌,保温。热浸镀样品经过氧压为10‑25‑10‑15atm,氧化10‑20h后,渗氮处理2h。本发明的抗结焦复合涂层内部具有牺牲阳极作用合金,Si减少脆性相的组成有助于加工;外部为氧化硅、氧化铝及氮化硼等陶瓷材料有助于抑制结焦。
Description
技术领域
本发明涉及复合材料技术领域,尤其涉及一种抗结焦复合涂层及其制备方法。
背景技术
乙稀是石油化工产业中最基本的原料之一,乙稀生产能力的大小是衡量一国乙烯竞争力的重要标准,产量直接影响着乙烯及其他衍生物的供应,同时也是衡量一个国家石油化工产业的重要标志。
目前国内外主要釆用的抑制结焦方法,主要有优化乙稀生产工艺、向原料中添加抑制剂、对炉管进行表面处理或改善炉管材料等方法。其目的是抑制均相与异相结焦反应,或改变焦拒的物理形态,使之松散、易于清除,并能降低炉管渗碳,从而延长裂解炉运行周期。
热浸镀是将金属工件浸入熔融金属中获得金属层的一种方法。热浸镀过程中被镀金属基体与镀层金属之间通过溶解、化学反应和扩散等方式形成冶金结合的合金层。当被镀金属基体从熔融金属中提出时,在合金层表面附着的熔融金属经冷却凝固成镀层。因此,热浸镀层与金属基体之间有很好的结合力。与电镀、化学镀相比,热浸镀的耐蚀性也较好。热浸镀锌是热浸镀层中最广泛的镀种。但是由于锌的熔点低及其资源的局限性,逐渐用热浸镀铝替代热浸镀锌。
纯铝的镀层中Fe2Al5相为斜方点阵,由于C轴上的节点被铝原子占据,且C轴上有较多空位(30%),有利于铝原子通过Fe2Al5相的晶格扩散并生长,这就导致纯铝合金层是很厚的锯齿状脆性组织,不利于后期加工。
发明内容
本发明的目的是针对以上现有技术的不足,提供一种便于加工、抗结焦性能优的复合涂层及其制备方法。本发明的镀层脆性相Fe2Al5相较薄且平缓的镀层便于加工,预氧化及渗氮后提升了抗结焦能力的复合镀层。
本发明提供的抗结焦复合涂层的制备方法,具体步骤如下:
镀层合金按照质量份数铝:硅:镁:硼为87-92.5:6-8:0.5-2:1-3,向熔炼炉中投入铝硅合金持续加温至700-750℃,待其熔融后投入预热至200-300℃的铝锭,加入精炼剂并对熔液充分搅拌,将熔液表层浮渣全部捞净,保温30min-1h;将铝箔包裹好的纯镁、硼快速进入熔池中;分5次搅拌,每10min搅拌2min,保温1h。将制备的铝硅镓硼液态合金浇铸到钢制的模具中,浇铸过程中应是扒渣后进行冷却定型、脱模后得到镀层合金。
将钢板依次在400目,1000目砂纸进行机械抛光除锈处理,浸泡在丙酮溶液中待用。在N2、H2混合气氛下,700-750℃进行热浸镀30s-5min。
采用Rhines Pack法进行氧化试验,选用纯度为99.99%的Fe/FeO粉堆来控制氧分压,其中Fe和FeO粉末按照原子比1:1进行配制,粉堆的总质量为4g。将配制好的粉末置于研钵中进行充分研磨,使两种粉末完全混合均匀,然后进行压块、烘干备用。将预氧化实验的浸镀试样置于丙酮试剂中超声10min,烘干备用。将烘干好的粉堆置于石英管的底部,加热石英管使之轻微向内凹陷,待冷却后再放置合金试样块,进行多次抽真空、氩气冲洗,最后在真空下密封石英管。将封装完毕的石英管置于双温管式炉中进行20min的粉堆预热,使石英管内的氧分压达到初步平衡,之后在调整石英管位置,进行相应温度下的预氧化实验。
预氧化后样品在450℃,N2气氛进行渗氮2h。
有益效果:
本发明的复合涂层采用热浸镀预氧化渗氮等复合方法,得到的涂层内部脆性相较薄便于加工,外部为经过预氧化得到的氧化铝氧化硅等陶瓷材料,抗结焦性能好。
附图说明:
图1为实施例1制备的样品的截面扫描电镜图片(SEM)。
图2为实施例1制备的样品镀层合金表面的电镜图片(SEM)。
图3为实施例2制备的样品镀层合金表面的电镜图片(SEM)。
图4为实施例3制备的样品镀层合金表面的电镜图片(SEM)。
图5为实施例4制备的样品镀层合金表面的电镜图片(SEM)。
图6为实施例5制备的样品镀层合金表面的电镜图片(SEM)。
图7为对比实施例2制备的样品镀层合金表面的电镜图片(SEM)。
图8为同等结焦条件下基体钢结焦后的电镜图片(SEM)。
图9为实施例1制备的样品结焦后的电镜图片(SEM)。
具体实施方式
为使本发明的目的、技术方案及优点更加清楚明白,下面结合具体的实施方案对本发明作进一步解释,但是并不用于限制本发明的保护范围。
实施例1
一种抗结焦复合涂层及其制备方法,具体步骤如下:
(1)将钢板用400目,1000目砂纸进行机械抛光除锈处理,浸泡在丙酮溶液中待用。在N2、H2混合气氛下,700℃进行热浸镀30s。热浸镀用合金锭按照质量分数铝:硅:镁:硼为90.5:8:0.5:1,向熔炼炉中投入铝硅合金持续加温至700℃,待其熔融后投入预热至200℃的铝锭,加入精炼剂并对熔液充分搅拌,将熔液表层浮渣全部捞净,保温30min;将铝箔包裹好的纯镁、硼快速进入熔池中;分5次搅拌,搅拌后保温1h。
(2)选用纯度为99.99%的Fe/FeO粉堆来控制氧分压10-15atm,其中Fe和FeO粉末按照原子比1:1进行配制,粉堆的总质量为4g。将配制好的粉末置于研钵中进行充分研磨,使两种粉末完全混合均匀,然后进行压块、烘干备用。将预氧化实验的浸镀试样置于丙酮试剂中超声10min,烘干备用。将烘干好的粉堆置于石英管的底部,加热石英管使之轻微向内凹陷,待冷却后再放置合金试样块(热浸镀后的合金试样块),进行多次抽真空、氩气冲洗,最后在真空下密封石英管。将封装完毕的石英管置于双温管式炉中进行20min的粉堆预热,使石英管内的氧分压达到初步平衡,之后在调整石英管位置,进行预氧化实验。预氧化后样品在450℃,N2气氛进行渗氮2h。
实施例2
一种抗结焦复合涂层及其制备方法,具体步骤如下:
(1)将钢板400目,1000目砂纸进行机械抛光除锈处理,浸泡在丙酮溶液中待用。在N2、H2混合气氛下,750℃进行热浸镀30s。热浸镀用合金锭按照质量分数铝:硅:镁:硼为92.5:6:0.5:1,向熔炼炉中温度投入铝硅合金持续加温至700℃,待其熔融后投入预热至200℃的铝锭,加入精炼剂并对熔液充分搅拌,将熔液表层浮渣全部捞净,保温30min;将铝箔包裹好的纯镁、硼快速进入熔池中;分5次搅拌,搅拌后保温1h。
步骤(2)同实施例1。
实施例3
(1)将钢板400目,1000目砂纸进行机械抛光除锈处理,浸泡在丙酮溶液中待用。在N2、H2混合气氛下,700℃进行热浸镀30s。热浸镀用合金锭按照质量分数铝:硅:镁:硼为89:8:2:1,向熔炼炉中温度投入铝硅合金持续加温至700℃,待其熔融后投入预热至200℃的铝锭,加入精炼剂并对熔液充分搅拌,将熔液表层浮渣全部捞净,保温30min;将铝箔包裹好的纯镁、硼快速进入熔池中;分5次搅拌,分5次搅拌,搅拌后保温1h。
步骤(2)同实施例1。
实施例4
一种抗结焦复合涂层及其制备方法,具体步骤如下:
(1)将钢板用400目,1000目砂纸进行机械抛光除锈处理,浸泡在丙酮溶液中待用。在N2、H2混合气氛下,700℃进行热浸镀30s。热浸镀用合金锭按照质量分数铝:硅:镁:硼为88.5:8:0.5:3,向熔炼炉中温度投入铝硅合金持续加温至700℃,待其熔融后投入预热至200℃的铝锭,加入精炼剂并对熔液充分搅拌,将熔液表层浮渣全部捞净,保温30min;将铝箔包裹好的纯镁、硼快速进入熔池中;分5次搅拌,分5次搅拌,搅拌后保温1h。
步骤(2)同实施例1。
实施例5
一种抗结焦复合涂层及其制备方法,具体步骤如下:
(1)将钢板用400目,1000目砂纸进行机械抛光除锈处理,浸泡在丙酮溶液中待用。在N2、H2混合气氛下,700℃进行热浸镀30s。热浸镀用合金锭按照质量分数铝:硅:镁:硼为89.5:8:0.5:2,向熔炼炉中温度投入铝硅合金持续加温至700℃,待其熔融后投入预热至200℃的铝锭,加入精炼剂并对熔液充分搅拌,将熔液表层浮渣全部捞净,保温30min;将铝箔包裹好的纯镁、硼快速进入熔池中;分5次搅拌,分5次搅拌,搅拌后保温1h。
步骤(2)同实施例1。
对比实施例1
一种抗结焦复合涂层及其制备方法,具体步骤如下:
(1)将钢板400目,1000目砂纸进行机械抛光除锈处理,浸泡在丙酮溶液中待用。在N2、H2混合气氛下,700℃进行热浸镀30s。热浸镀用合金锭按照质量分数铝:硅:镁:硼为90.5:8:0.5:1,向熔炼炉中温度投入铝硅合金持续加温至700℃,待其熔融后投入预热至200℃的铝锭,加入精炼剂并对熔液充分搅拌,将熔液表层浮渣全部捞净,保温30min;将铝箔包裹好的纯镁、硼快速进入熔池中;分5次搅拌,搅拌2min保温10min,保温1h。
(2)采用选用纯度为99.99%的Fe/FeO粉堆来控制氧分压10-15atm,其中Fe和FeO粉末按照原子比1:1进行配制,粉堆的总质量为4g。将配制好的粉末置于研钵中进行充分研磨,使两种粉末完全混合均匀,然后进行压块、烘干备用。将预氧化实验的浸镀试样置于丙酮试剂中超声10min,烘干备用。将烘干好的粉堆置于石英管的底部,加热石英管使之轻微向内凹陷,待冷却以后再放置合金试样块,进行多次抽真空、氩气冲洗,最后在真空下密封石英管。将封装完毕的石英管置于双温管式炉中进行20min的粉堆预热,使石英管内的氧分压达到初步平衡,之后在调整石英管位置,进行相应温度下的预氧化实验。
对比实施例2
一种抗结焦复合涂层及其制备方法,具体步骤如下:
(1)将钢板用400目,1000目砂纸进行机械抛光除锈处理,浸泡在丙酮溶液中待用。在N2、H2混合气氛下,700℃进行热浸镀30s。热浸镀用合金锭按照质量分数铝:硅:镁为91.5:8:0.5,向熔炼炉中温度投入铝硅合金持续加温至700℃,待其熔融后投入预热至200℃的铝锭,加入精炼剂并对熔液充分搅拌,将熔液表层浮渣全部捞净,保温30min;将铝箔包裹好的纯镁、硼快速进入熔池中;分5次搅拌,分5次搅拌,搅拌后保温1h。
步骤(2)同实施例1。
表1实施例结焦实验
以上实施例仅用以说明本发明的技术方案,其描述较为具体和详细,而非对其限制。对于本领域的普通技术人员来说,在不脱离本发明构思的前提下,还可以做出各种更改和变化,这些都属于本发明的保护范围。
Claims (9)
1.一种抗结焦复合涂层的制备方法,其特征在于,所述制备方法步骤如下;
(1)对钢板进行预处理;
(2)预处理后的钢板在N2、H2混合气体中进行热浸镀;其中,合金镀液按照质量份的组成为:铝:87-92.5,硅:6-8,镁:0.5-2,硼:1-3;
(3)对热浸镀后的钢板进行热氧化;
(4)对热氧化后的钢板进行渗氮处理。
2.根据权利要求1所述的抗结焦复合涂层的制备方法,其特征在于,步骤(1)中,钢板依次采用400目,1000目砂纸进行机械抛光除锈处理,浸泡在丙酮溶液中待用。
3.根据权利要求1所述的抗结焦复合涂层的制备方法,其特征在于,步骤(2)中,合金镀液制备方法为:向熔炼炉中投入铝硅合金持续加温至700-750℃,待其熔融后投入预热至200-300℃的铝锭,加入精炼剂并对熔液充分搅拌,将熔液表层浮渣全部捞净,保温;将铝箔包裹好的纯镁、硼快速进入熔池中;分5次搅拌,搅拌后保温,得到合金镀液。
4.根据权利要求1所述的抗结焦复合涂层的制备方法,其特征在于,步骤(2)中,热浸镀温度700-750℃,热浸镀时间30s-5min。
5.根据权利要求1所述的抗结焦复合涂层的制备方法,其特征在于,步骤(3)中,选用纯度为99.99%的烘干Fe/FeO粉堆来控制氧分压,Fe/FeO粉堆的总质量为4g,Fe和FeO粉末按照原子比1:1进行配制。
6.根据权利要求5所述的抗结焦复合涂层的制备方法,其特征在于,Fe/FeO粉堆制备方法为:配制好的Fe和FeO粉末置于研钵中进行充分研磨,使两种粉末完全混合均匀,然后进行压块、烘干备用。
7.根据权利要求1所述的抗结焦复合涂层的制备方法,其特征在于,步骤(3)中,将浸镀试样置于丙酮试剂中超声10min,烘干备用;将粉堆置于石英管的底部,加热石英管使之轻微向内凹陷,待冷却后放置浸镀试样,进行抽真空、氩气冲洗,最后在真空下密封石英管,将封装完毕的石英管置于双温管式炉中进行20min的粉堆预热,使石英管内的氧分压达到10-25-10-15atm.,然后调整石英管位置,进行10-20h的预氧化。
8.根据权利要求1所述的抗结焦复合涂层的制备方法,其特征在于,步骤(4)中,预氧化后样品在N2气氛450℃条件下进行渗氮2h。
9.根据权利要求1-8任一项所述方法制备的抗结焦复合涂层。
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