CN106488892A - 包括可磨损涂层的辊 - Google Patents

包括可磨损涂层的辊 Download PDF

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Publication number
CN106488892A
CN106488892A CN201580037099.5A CN201580037099A CN106488892A CN 106488892 A CN106488892 A CN 106488892A CN 201580037099 A CN201580037099 A CN 201580037099A CN 106488892 A CN106488892 A CN 106488892A
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Prior art keywords
roller
weight
coating
particle
aggregation
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CN201580037099.5A
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CN106488892B (zh
Inventor
让-丹尼斯·尼古拉斯
吉尔伯特·兰库勒
克里斯汀·贝里
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Vesuvius Limited-Liability Co Of France
Vesuvius France SA
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Vesuvius Limited-Liability Co Of France
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    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
    • C04B35/58—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides
    • C04B35/584—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides based on silicon nitride
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/18—Processes for applying liquids or other fluent materials performed by dipping
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/007—After-treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
    • B05D3/0254—After-treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
    • B21B27/02—Shape or construction of rolls
    • B21B27/03—Sleeved rolls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B39/008—Rollers for roller conveyors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G39/00—Rollers, e.g. drive rollers, or arrangements thereof incorporated in roller-ways or other types of mechanical conveyors 
    • B65G39/02—Adaptations of individual rollers and supports therefor
    • B65G39/07—Other adaptations of sleeves
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    • C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
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    • C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
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    • C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
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    • C04B35/597—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides based on silicon oxynitride, e.g. SIALONS
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    • C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
    • C04B35/62605—Treating the starting powders individually or as mixtures
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    • C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
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    • C04B41/80—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only ceramics
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    • 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
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    • 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
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    • C09D7/61—Additives non-macromolecular inorganic
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    • 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
    • C23C24/00—Coating starting from inorganic powder
    • C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
    • C23C24/082—Coating starting from inorganic powder by application of heat or pressure and heat without intermediate formation of a liquid in the layer
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    • 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
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
    • C23C4/10—Oxides, borides, carbides, nitrides or silicides; Mixtures thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
    • F27B9/20—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace
    • F27B9/24—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace being carried by a conveyor
    • F27B9/2407—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace being carried by a conveyor the conveyor being constituted by rollers (roller hearth furnace)
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
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    • F27D3/026—Skids or tracks for heavy objects transport or conveyor rolls for furnaces; roller rails
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    • C03C2217/40—Coatings comprising at least one inhomogeneous layer
    • C03C2217/42—Coatings comprising at least one inhomogeneous layer consisting of particles only
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    • C03C2217/00—Coatings on glass
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    • C03C2218/00—Methods for coating glass
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Abstract

本发明涉及应用于辊上的保护的及可磨损的涂层组合物，并且更具体地涉及在高温应用中使用的包括可磨损涂层的传送机辊、用于制造此类辊的方法、及其用途。由铝熔体造成的腐蚀减少，并且通过摩擦移除沉积物质。从而增加辊的使用寿命。该涂层包含83重量％‑98重量％的聚集体，该聚集体包含Si3N4、SiC或SiAlON粒子或它们的混合物，以及2重量％‑17重量％的Al2O3、SiO2、ZrO2、CeO2、Y2O3亚微米粒子或它们的混合物。

Description

包括可磨损涂层的辊
技术领域
本专利申请涉及应用于辊上的保护性及可磨损涂层组合物，并且更具体地涉及用于高温应用的包括可磨损涂层的传送机辊、生产此类涂层的组合物、制造此类辊的方法、及其用途。
背景技术
经运送的金属片常以铝或含铝的锌合金处理以抗腐蚀。众所皆知由包含熔融石英、莫来石、硅线石、矾土、SiC基体、或金属(如耐火钢)的材料构成的辊于高温度下的极佳特性，如其高耐火性及低热膨胀性，及其对于熔融金属的相对惰性。其广泛用于辊膛炉。尽管含二氧化硅的辊为优选的，其存在缺点：虽于炉内进行，经涂布的金属片的铝开始熔化。部分熔化的铝与源自陶瓷辊体的SiO2或硅酸盐反应，导致铝氧化(Al＝>Al2O3)且硅酸盐还原为金属形式(主要为Si)，从而由于腐蚀而大幅减少辊的寿命。
已知欲防止腐蚀，辊可以SiAlON或以经烧结的氮化硅或碳化硅涂布。涂层可进一步包含钛酸铝粒子。所有该些材料为确实已知对于熔融铝具有非润湿特性。
即使减少腐蚀，一些沉积现象仍持续。通过使用硬或持久性氮化硅涂层，Si3N4于表面缓慢氧化，致使形成二氧化硅。次要相(如源自氮化硅氧化的二氧化硅)与铝反应，产生Al2O3与Si，其聚积于经涂布的辊表面。
公开于US-A1-2007/089642中的硬涂层包含氮化硅粒子及黏合剂，其含有在有机溶剂中的表面改质的纳米尺度固体粒子。该涂层描述为硬质，因氮化物涂层对基材的强黏着性。有机溶剂用于避免氮化硅粒子的任何水解。此硬涂层通常应用于太阳能坩埚，也可应用于铝冶金的上升管，以防铝腐蚀。
US-A1-2009160108公开无涂层的熔融石英辊，其中表面多孔性是利用有机溶剂填入氮化硅。此为某种程度上防止表面沉积。由于熔融石英仍为表面上的主要相，当接触铝时，仍观察到腐蚀。
发明内容
本发明的目的是提供耐铝腐蚀的辊，此外其解决沉积问题。辊的表面经涂布，但与US-A1-2007/0089642相反的是，涂层非硬质。于本发明中，涂层是可磨损的，且通过磨耗而与沉积物一起部分移除，产生干净表面，同时维持良好耐铝腐蚀性。
本发明涉及具有至少一层可磨损涂层的辊，其包含：
a)83-98重量％的聚集体，其包含Si3N4、SiC、或SiAlON粒子或它们的混合物，
b)2-17重量％的Al2O3或SiO2、ZrO2、CeO2、Y2O3亚微米粒子或它们的混合物。
亚微米粒子的平均粒径高于100nm但低于1000nm。
聚集体可进一步包含Al2TiO5粒子。
此类辊主要用于辊膛炉，其使用的温度高于800℃。当金属或金属氧化物(如部分氧化的铝或矾土)的沉积物聚积于辊表面上时，辊涂层的Si3N4粒子倾向于通过在辊上的经运送的金属片的摩擦而脱落。Si3N4粒子/Si3N4粒子间的键，以及Si3N4粒子/基材间的键确实是弱的。于高温下特定时间后(于用户的炉中可达数周)，氮化硅粒子与黏合剂粒子间的内聚力增加，且涂层致密化但维持其可磨损性质。尽管如此，沉积物仍剥落，因经致密化涂层的部分最终于摩擦作用下剥落。此还是辊表面上的金属片的摩擦及辊与致密化涂层间的界面的黏着性的结果，辊与致密化涂层间的界面的黏着性比沉积物与致密化涂层间的界面的黏着性弱。根据亚微米粒子的浓度或本质，其与基材的黏着性及内聚力进一步经改进，且尽管有摩擦力，沉积物未剥落且仍位于辊上。然而，视需求，该些沉积物仍可通过外部作用而机械性剥落。于此情况，辊必须拆除，从而通过施加足够的摩擦力以清洁沉积物。另一选项是完全移除涂层，且重新施加新涂层至辊。
术语“可磨损”用于描述于经运送的金属片的摩擦下或通过施加外部作用(如研磨步骤)而被磨耗的涂层。其结果为，涂层表面是自我再生，且辊的寿命增加。
涂层任选地包含暂时性黏合剂，如有机黏合剂。有机黏合剂可为丙烯酸系或环氧聚合物、淀粉、聚乙烯醇等。有机黏合剂的优势为，在暂时性基础上增加例如运输和/或安装辊而不损坏所需的机械性质。一旦辊用于炉中，有机黏合剂由于高温而消失，留下辊与其可磨损涂层。
氮化物粒子的比表面积小于或等于8m2/g，且优选地介于0.5与5m2/g之间。如果比表面积高于8m2/g，因涂层干燥期间产生的压力而观察到裂缝。例如，实现包括具有比表面积10m2/g的粒子的涂层，且裂缝数目极高，其程度使得经涂布的制品不可使用。
使用数种显示不同比表面积的粒子，允许在组合物施加至基材时通过优化粉末堆积而适配涂层密度及性质。
本发明进一步提供辊，其中可磨损涂层由多个组合物层构成，其包含：
a)83-98重量％的Si3N4、SiC、或SiAlON粒子或它们的混合物的聚集体，
b)2-17重量％的Al2O3或SiO2、ZrO2、CeO2、Y2O3亚微米粒子或它们的混合物。
聚集体可进一步包含Al2TiO5粒子。
由于涂层是在摩擦下移除，可根据制造涂层所用的条件订制辊的使用寿命。
为了使辊可运输，经涂布的辊是优选地于至少800℃下加热至少3小时。
涂层的平均厚度为至少150μm是有利的。
可磨损涂层可通过使用下述的组合物构成。本发明的目的还用于生产在辊上的可磨损涂层的组合物，其包含：
a)50-75重量％的Si3N4、SiC、或SiAlON粒子或它们的混合物的聚集体，
b)1.5-10重量％，优选地1.5-5重量％的Al2O3或SiO2、ZrO2、CeO2、Y2O3亚微米粒子或它们的混合物，
c)15-48.5重量％的H2O，
其特征为该Si3N4、SiC、或SiAlON粒子具有的比表面积(BET)小于或等于8m2/g，且优选地包括介于0.5与5m2/g之间。
聚集体可进一步包含Al2TiO5粒子，其具有的比表面积(BET)小于或等于8m2/g，且优选地介于0.5与5m2/g之间。
基于粉末比表面积的颗粒分布优化，允许订制具有高涂层密度的组合物流动性。辊从而易于涂布。
由于氮化硅粒子悬浮或溶解于水中，观察到表面粒子水解。此确实是为什么US-A1-2007/0089642主张必须不存在水以取得硬涂层的原因。然而，发明人意外发现，此水解使得颗粒表面对黏合剂产生优化的化学亲和力，其明显减少黏合剂的需求，达到涂层与基材的最小黏着性。
亚微米粒子如Al2O3或SiO2的平均粒径高于100nm。其常于水性胶体溶液形式下使用。水性胶体溶液操作上容易且安全。
本发明的另一目的是制造辊的方法，其包括的步骤为：
a)提供辊，该辊包括熔融石英、莫来石、硅线石、矾土、SiC基体、或金属诸如耐火钢，该辊具有芯及表面；
b)对该制品的至少表面的至少一部分施加上述的组合物；
c)干燥该辊；
d)任选地，于800℃下加热该辊至少3小时。
涂层通过喷涂、浸涂、溢流(flooding)、或等离子喷涂该组合物而施加至辊。
上述的辊可优势地用于运输以铝处理的钢片。
本发明现将通过本发明的实施例及比较例的方式说明。
可磨损性质是通过耐磨耗性测试及抗刮性评估。为了操控辊而无损毁，需要最小抗刮性。此外，耐磨耗性不应太低，以确保涂层的最小寿命，且不能太高，以使沉积物通过摩擦移除。发明人注意到，可磨损性质是二抗性数值结合的结果。
耐磨耗性根据下列步骤测定。图1是描绘测试条件的侧视图。将50mm长度且50mm直径的熔融石英辊(1)秤重，然后提供以待评估的组合物的200μm涂层(4)。一旦涂层(4)经干燥(60℃下2小时)，再次将经涂布的辊秤重，并测定涂层重量。
辊(1)安装于轴(5)上，且水平固定在二个位于垂直安装于撑体(2)的轴(6)上的20(c)×60mm支架(8a,8b)之间的金属板(3)(200×100×1mm的USIBOR1500钢片，150g)是经排列以正切接触经涂布的辊。二轴(5)与(6)平行。板(3)通过螺栓(7)固定于支架(8a,8b)之间，以免因辊旋转而移位。在涂层磨耗时，板于轴(6)上逐渐倾斜。轴(6)与板(3)/经涂布的辊的接触点间的距离(a)设定为150mm。板(3)/经涂布的辊的接触点与板(3)最靠近撑体(2)的末端间的距离(b)设定为125mm。
辊以220rpm旋转。旋转周期性中断，且测定残留的涂层重量。重复该操作，直到磨损30重量％的涂层为止。
如果30重量％的涂层在小于250分钟内磨耗，则该涂层标记为(--)。如果磨耗30重量％的涂层需要大于500分钟，则涂层标记为(++)。如果30重量％的涂层在包括于250与500分钟间的时间内磨耗，则涂层标记为(+-)。
耐磨耗性代表涂层组分间的键结强度。
抗刮性代表与基材的黏着强度。其刮划经涂布表面所需的负载(以牛顿计)。意外地发现，抗刮性可为相当高，而耐磨耗性低。
于数值1N以下时，黏着强度太弱。当辊经运输或操控时，涂层损毁。
当抗刮性高于7N时，涂层视为具有强黏着性。然而，涂层仍可磨损。
作为实施例，通过混合氮化硅粉末与SiO2或Al2O3胶体溶液及水而制造三种组合物(用于产生实施例1至9的组合物1至3)。从而将辊浸渍于组合物溶液中，且随后于60℃下干燥2小时。
涂层组合物的实施例示出于表1
组合物1 组合物2 组合物3
Si3N4重量％ 62 62 50
亚微米SiO2重量％ 3 0 0
亚微米Al2O3重量％ 0 2 4
水重量％ 35 36 46
然后以三种不同条件评估此类辊(实施例1至9)。
首先(实施例1至3)，辊不受高于干燥温度的进一步热处理。
其次(实施例4至6)，以2重量％的浓度将有机黏合剂加入涂层组合物。辊浸渍于涂层溶液中，然后干燥及测试。
此外(实施例7至9)，使用包括有机黏合剂的组合物涂布的辊于800℃下加热3小时。
作为比较例(实施例10)，辊以US-A1-2008-260608公开的组合物涂布。由于Si3N4粒子的粒度分析(颗粒主要≤1微米)，涂层通过喷涂形成。于干燥步骤后，辊在1000℃下加热3小时。组合物如下：
比较例 实施例10
Si3N4重量％ 40
亚微米SiO2重量％ 10
水重量％ 45
聚乙烯醇 5
实施方案给出下列结果(表2)。
如可由表2观察，未经燃烧的实施例(1-3)具有低耐磨耗及抗刮性。该些经涂布者耐铝腐蚀，但辊无法运输。
将有机黏合剂添加至组合物会增加所有组合物的抗刮性及耐磨耗性(实施例4至6)。
当辊于800℃下加热至少3小时(实施例7至9)，有机黏合剂消失而不损毁氮化硅层。相较于未经加热的辊，耐磨耗性轻微改进。由于弱磨耗性(--)，当受到摩擦时，沉积物将倾向连同氮化硅粒子脱落。增加耐磨耗性(+/-)及抗刮性，沉积物将倾向连同隔离的氮化硅粒子脱落，但还与其形成一部分涂层。较高的抗刮性值可导致更黏的沉积物，从而需要进一步的量值以将其移除。
高抗刮性允许替换辊时无需降低炉温度，其在保养或替换辊时可能需要。
尽管加热，比较样本的耐磨耗性与抗刮性数值皆低(实施例10)。此涂层的特性完全不同。其原因为，氮化物粒子的粒径低于1μm。尽管涂层于1000℃下加热，具有此涂层的辊无法用于此工业应用，因低耐磨耗性导致高度可磨损的涂层。于短时间后，辊表面上不留涂层，诱导沉积物出现及辊体腐蚀。

Claims (14)

1.一种辊，所述辊在800℃下3小时后具有至少一层可磨损的涂层，所述涂层包含：
a)83重量％-98重量％的聚集体，所述聚集体包含Si3N4、SiC或SiAlON粒子或它们的混合物，
b)2重量％-17重量％的Al2O3、SiO2、ZrO2、CeO2、Y2O3亚微米粒子或它们的混合物。
2.根据权利要求1所述的辊，其中所述聚集体还包含Al2TiO5粒子。
3.根据前述权利要求中任一项所述的辊，其中所述聚集体粒子的比表面积(BET)低于或等于8m2/g，并且优选地介于0.5m2/g和5m2/g之间。
4.根据前述权利要求中任一项所述的辊，其中粒子的所述聚集体包含具有不同比表面积的粒子。
5.根据前述权利要求中任一项所述的辊，其中所述涂层由根据权利要求1所述的多个层构成。
6.根据前述权利要求中任一项所述的辊，其中所述涂层的平均厚度为至少150μm。
7.根据前述权利要求中任一项所述的辊，其中所述辊由熔融石英、莫来石、硅线石、氧化铝、SiC基体或金属诸如耐火钢构成。
8.根据前述权利要求中任一项所述的辊，其中所述涂层包含临时粘合剂，诸如丙烯酸系聚合物或环氧聚合物，或者聚乙烯醇。
9.一种组合物，包含：
a)50重量％-75重量％的Si3N4、SiC或SiAlON粒子或它们的混合物的聚集体，
b)1.5重量％-10重量％，优选地1.5重量％-5重量％的Al2O3或SiO2、ZrO2、CeO2、Y2O3亚微米粒子或它们的混合物，
c)15重量％-48.5重量％的H2O，
其特征在于所述Si3N4、SiC或SiAlON粒子具有低于或等于8m2/g、并且优选地包括在0.5m2/g和5m2/g之间的比表面积(BET)。
10.根据权利要求9所述的组合物，其中所述聚集体还包含Al2TiO5粒子，所述Al2TiO5粒子具有低于或等于8m2/g、并且优选地包括在0.5m2/g和5m2/g之间的比表面积(BET)。
11.一种用于制造根据权利要求1至8中任一项所述的辊的方法，包括以下步骤：
a)提供辊，所述辊由熔融石英、莫来石、硅线石、氧化铝、SiC基体或金属诸如耐火钢构成，所述辊具有芯和表面；
b)将根据权利要求9所述的组合物施加于所述辊的表面的至少一部分上；
c)干燥所述辊。
12.根据权利要求11所述的方法，其中所述组合物通过喷涂、浸涂、溢流或等离子喷涂来涂布。
13.根据权利要求11所述的方法，还包括在至少800℃的温度下加热所述辊至少3小时的步骤。
14.根据权利要求1至8中任一项所述的辊的用途，用于运输以铝处理的钢片。
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