KR101316906B1 - METHOD OF LIFE-PROLONGATION OF A CERAMIC ROLL USED FOR CONVEYING Si-STEEL STRIP - Google Patents

METHOD OF LIFE-PROLONGATION OF A CERAMIC ROLL USED FOR CONVEYING Si-STEEL STRIP Download PDF

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KR101316906B1
KR101316906B1 KR1020060130049A KR20060130049A KR101316906B1 KR 101316906 B1 KR101316906 B1 KR 101316906B1 KR 1020060130049 A KR1020060130049 A KR 1020060130049A KR 20060130049 A KR20060130049 A KR 20060130049A KR 101316906 B1 KR101316906 B1 KR 101316906B1
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boron nitride
roll
ceramic roll
ceramic
life
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KR20080056904A (en
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전명철
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재단법인 포항산업과학연구원
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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
    • C23C26/00—Coating not provided for in groups C23C2/00 - C23C24/00
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
    • C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
    • C04B41/5053—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials non-oxide ceramics
    • C04B41/5062—Borides, Nitrides or Silicides
    • C04B41/5064—Boron nitride
    • 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
    • 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
    • C23C24/00—Coating starting from inorganic powder
    • C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat

Abstract

본 발명의 일 실시예에 따른 세라믹 롤의 수명연장 방법은, ⅰ) 질화붕소(BN) 분말을 알코올과 혼합 후, 분쇄 혼합하여 초미세 질화붕소 코팅액을 제조하는 단계, ⅱ) 질화붕소 코팅액에 세라믹 롤을 담지하여 롤의 표면을 질화붕소 코팅액으로 코팅하는 단계, 및 ⅲ) 코팅된 세라믹 롤을 건조 후 소성하는 단계를 포함한다.In the method of extending the life of the ceramic roll according to an embodiment of the present invention, i) mixing boron nitride (BN) powder with alcohol, followed by pulverization mixing to prepare an ultrafine boron nitride coating solution, ii) a ceramic in the boron nitride coating solution Supporting the roll to coat the surface of the roll with a boron nitride coating solution, and iii) firing the coated ceramic roll after drying.

세라믹 롤, 코팅, 결정화, 질화붕소(BN), 저온 소성, 표면 처리 Ceramic Roll, Coating, Crystallization, Boron Nitride (BN), Low Temperature Firing, Surface Treatment

Description

전기강판 이송용 세라믹 롤의 수명연장 방법{METHOD OF LIFE-PROLONGATION OF A CERAMIC ROLL USED FOR CONVEYING Si-STEEL STRIP}Life Extension Method of Ceramic Roll for Electric Steel Sheet Transfer {METHOD OF LIFE-PROLONGATION OF A CERAMIC ROLL USED FOR CONVEYING Si-STEEL STRIP}

본 발명은 전기강판 이송용 세라믹 롤의 수명연장 방법에 관한 것으로서, 더욱 상세하게는 강판 스트립(strip)을 연속적으로 이송하는 세라믹 롤의 표면을 알루미나질 코팅함으로써 세라믹 롤의 수명을 연장시키는 방법에 관한 것이다.The present invention relates to a method for extending the life of a ceramic roll for conveying electrical steel sheet, and more particularly, to a method for extending the life of a ceramic roll by alumina coating a surface of the ceramic roll for continuously transferring a strip of steel sheet. will be.

규소 강판 스트립의 연속적인 열처리, 예를 들면 갈바나이징(galvanizing) 라인 등에 있어서, 950℃ 이상의 고온에서 허스롤(hearth roll) 표면에 금속철이나 산화철이 부착되는 현상이 발생된다. 부착된 금속철이나 산화철은 스트립 표면에 마킹(marking)이나 스크래칭(scratching) 등의 손상이 발생하는 원인이 된다.In the continuous heat treatment of a silicon steel strip, for example, a galvanizing line, etc., a phenomenon in which metal iron or iron oxide adheres to the hearth roll surface at a high temperature of 950 ° C. or higher occurs. Attached metal iron or iron oxide causes damage such as marking or scratching on the surface of the strip.

종래의 스틸 롤은 특히, 고온 영역에서 상기와 같은 부착 현상의 발생율이 높다. 이를 해결하기 위해 950℃ 이상의 고온에서 부착 현상의 발생율이 낮은 고순도의 용융 실리카로 제조된 세라믹 롤이 사용되고 있다. 이러한 세라믹 롤의 수명은 세라믹 롤 표면의 결정화 및 작은 박리에 따른 롤 손상에 의해 결정지워진다. 결정화에 가장 큰 영향을 주는 것은 나트륨(Na), 칼륨(K) 등의 불순물이다. 이들 불순물들이 실리카와 접할 경우, 비교적 저온에서도 결정화되어 롤 표면의 박리 현상을 촉진하고, 세라믹 롤의 수명을 저하시킨다. 이러한 결정화를 유발하는 알칼리계 불순물들은 주로 작업중 세라믹 롤과 접하게 되는 규소강판으로부터 유입된다.Conventional steel rolls have a high incidence of such adhesion phenomenon, especially in the high temperature region. In order to solve this problem, a ceramic roll made of high purity fused silica having a low incidence of adhesion phenomenon at a high temperature of 950 ° C. or more is used. The life of this ceramic roll is determined by the roll damage due to crystallization of the ceramic roll surface and small peeling. The biggest influence on the crystallization is impurities such as sodium (Na) and potassium (K). When these impurities come into contact with silica, they crystallize even at a relatively low temperature to promote the peeling phenomenon on the surface of the roll and reduce the life of the ceramic roll. Alkali-based impurities causing this crystallization are mainly introduced from the silicon steel sheet which comes into contact with the ceramic roll during operation.

불순물에 의한 세라믹 롤 표면의 결정화 현상을 최소화하여 박리현상을 줄임으로써 궁극적으로 세라믹 롤의 수명을 연장시키는 방법을 제공하고자 한다.The present invention aims to provide a method of ultimately extending the life of a ceramic roll by minimizing crystallization of the surface of the ceramic roll due to impurities to reduce the peeling phenomenon.

또한, 기존 방법에 의해 제조되는 세라믹 롤의 저밀도에 따른 세라믹 슬리브의 단점을 극복하기 위한 세라믹 롤의 수명연장 방법을 제공하고자 한다.In addition, to provide a method of extending the life of the ceramic roll to overcome the disadvantages of the ceramic sleeve due to the low density of the ceramic roll manufactured by the existing method.

본 발명의 일 실시예에 따른 세라믹 롤의 수명연장 방법은, ⅰ) 질화붕소(BN) 분말을 알코올과 혼합 후 분쇄 혼합하여 초미세 질화붕소 코팅액을 제조하는 단계, ⅱ) 질화붕소 코팅액에 세라믹 롤을 담지하여 롤의 표면을 질화붕소 코팅액으로 코팅하는 단계, 및 ⅲ) 코팅된 세라믹 롤을 건조 후 소성하는 단계를 포함한다.In the method of extending the life of a ceramic roll according to an embodiment of the present invention, i) preparing boron nitride coating liquid by mixing boron nitride (BN) powder with alcohol and pulverizing the mixture, and ii) ceramic roll in the boron nitride coating liquid. Supporting the surface of the roll with a boron nitride coating solution, and iii) firing the coated ceramic roll after drying.

질화붕소 코팅액을 제조하는 단계에서, 코팅액은 질화붕소 분말과 에탄올을 포함할 수 있다. 에탄올의 함량이 질화붕소 분말 1g에 대하여 1g 내지 100g일 수 있다. 또한, 질화붕소 입자의 평균입도가 0.5㎛ 내지 10㎛가 되도록 분쇄할 수 있다. In preparing the boron nitride coating solution, the coating solution may include boron nitride powder and ethanol. The content of ethanol may be 1g to 100g based on 1g of boron nitride powder. Further, the boron nitride particles can be pulverized so that the average particle size is 0.5 µm to 10 µm.

진공 분위기를 유지시켜 코팅액을 세라믹 롤에 잘 스며들게 할 수 있다.The vacuum atmosphere can be maintained to allow the coating solution to penetrate the ceramic roll well.

한편, 롤의 표면을 질화붕소 코팅액으로 코팅하는 단계, 및 코팅된 세라믹 롤을 건조 후 소성하는 단계를 1회 내지 2회 반복할 수 있다.On the other hand, the step of coating the surface of the roll with the boron nitride coating liquid, and the step of drying and baking the coated ceramic roll may be repeated once or twice.

이하, 본 발명의 일 실시예를 더욱 상세하게 설명한다. 이러한 본 발명의 실시예는 단지 본 발명을 예시하기 위한 것이며, 본 발명이 이에 한정되는 것은 아니다.Hereinafter, an embodiment of the present invention will be described in more detail. These embodiments of the present invention are merely to illustrate the invention, but the invention is not limited thereto.

본 실시예에 따른 세라믹 롤의 수명연장 방법은, 세라믹 롤의 표면을 초미세 질화붕소 화합물로 코팅함으로써 롤의 결정화 및 박리에 따른 롤의 손상을 지연시켜 세라믹 롤의 수명을 연장시키는 방법이다.In the method of extending the life of the ceramic roll according to the present embodiment, the surface of the ceramic roll is coated with an ultrafine boron nitride compound to delay the damage of the roll due to the crystallization and peeling of the roll, thereby extending the life of the ceramic roll.

세라믹 롤의 코팅액으로 사용되는 질화붕소 코팅액은 질화붕소 분말과 알코올을 혼합하여 제조한다. 여기서, 질화붕소 분말은 시중에서 상용으로 판매하는 입도 3~100㎛ 의 분발을 사용할 수 있다. 알코올은 예를 들면, 에탄올을 사용할 수 있으며, 그 함량은 질화붕소 분말 100g에 500~1000g을 사용할 수 있다. 질화붕소 분발과 에탄올을 혼합하여 고속 볼밀 등의 방법으로 균질 혼합 및 초미세 분쇄하여 코팅액을 제조한다. 질화붕소 분말의 평균 입도가 0.5~10㎛가 되도록 분쇄한다. 또한, 코팅액 제조시 혼합액에 상용의 바인더를 더 첨가할 수 있다.The boron nitride coating liquid used as the coating liquid of the ceramic roll is prepared by mixing boron nitride powder and alcohol. Here, the boron nitride powder may use a powder having a particle size of 3 to 100 µm that is commercially available. Alcohol may be used, for example, ethanol, the content of the 500 to 1000g may be used for 100g of boron nitride powder. Boron nitride powder and ethanol are mixed, homogeneous mixing and ultra-fine grinding by a high speed ball mill or the like to prepare a coating solution. It is pulverized so that the average particle size of the boron nitride powder becomes 0.5-10 micrometers. In addition, a commercially available binder may be further added to the mixed solution in preparing the coating solution.

질화붕소 코팅액에 세라믹 롤을 담지하여 롤의 표면을 질화붕소 코팅액으로 코팅한다. 코팅방법으로는 기존에 알려진 많은 방법이 사용될 수 있으나 세라믹 롤을 코팅액에 담지한 후, 끌어 올리는 인상코팅법이 가장 간편하다. 담지 공정시 코팅액이 담긴 코팅조를 진공 분위기로 유지시키면 세라믹 롤의 기공을 좀더 잘 메울 수 있다.The surface of the roll is coated with the boron nitride coating liquid by supporting the ceramic roll in the boron nitride coating liquid. As a coating method, many known methods can be used, but the impression coating method of pulling up the ceramic roll in the coating liquid and then pulling it up is the simplest. Maintaining the coating bath containing the coating liquid in a vacuum atmosphere during the supporting process can more effectively fill pores of the ceramic roll.

코팅된 세라믹 롤을 상온에서 24시간 이상 건조시키고, 건조된 세라믹 롤을 오븐으로 옮겨 110℃의 온도에서 24시간 이상 충분히 건조시킨다. 충분히 건조된 롤을 공기중 700~1100℃에서 1~10시간 동안 열처리한다. 그 결과, 세라믹 롤 표면과 표면 부근에 위치하는 기공이 메워지고, 세라믹 롤 표면 전체에 10~100 ㎛ 정도의 균질한 질화붕소 코팅층이 형성된다.The coated ceramic roll is dried at room temperature for at least 24 hours, and the dried ceramic roll is transferred to an oven and sufficiently dried at a temperature of 110 ° C. for at least 24 hours. The sufficiently dried rolls are heat treated at 700-1100 ° C. for 1-10 hours in air. As a result, pores located near the surface of the ceramic roll and the surface are filled, and a homogeneous boron nitride coating layer of about 10 to 100 µm is formed on the entire surface of the ceramic roll.

롤 표면에 코팅된 질화붕소층의 두께는 전술한 공정을 반복할수록 더 많은 기공이 메워지고 코팅층 자체의 두께도 증가된다. 그러나 지나친 반복 코팅은 비경제적일뿐만 아니라 코팅층 자체의 기계적 물성이 취약해지므로, 1~2번 정도가 좋다. 2회 반복 코팅된 롤은 약 100~150㎛의 질화붕소 층이 형성된다.The thickness of the boron nitride layer coated on the roll surface is filled with more pores as the aforementioned process is repeated, and the thickness of the coating layer itself increases. However, excessive repeated coating is not only economical but also weakens the mechanical properties of the coating layer itself, so 1 to 2 times is good. The roll repeatedly coated twice forms a boron nitride layer of about 100-150 μm.

전술한 바와 같이, 세라믹 롤의 표면에 존재하는 기공을 메우면 세라믹 롤의 작동시 불순물이 롤 표면에 축적(build-up)되거나 롤 내부로 확산되는 것을 억제할 수 있다. 특히, 가수분해액에 포함된 질화붕소는 내마모성이 우수하여 코팅층이 세라믹 롤의 표면으로부터 쉽게 박리되지 않는다. 더욱이, 질화붕소는 내열성이 강하여 고온에서 사용할 수 있다.As described above, by filling the pores present on the surface of the ceramic roll, it is possible to suppress the build-up of impurities or diffusion into the roll during the operation of the ceramic roll. In particular, the boron nitride contained in the hydrolysis solution is excellent in wear resistance, so that the coating layer is not easily peeled off from the surface of the ceramic roll. Moreover, boron nitride is strong in heat resistance and can be used at high temperatures.

다음은 본 발명의 이해를 돕기 위하여 바람직한 실험예를 제시한다. 그러나 하기의 실험예는 본 발명을 보다 쉽게 이해하기 위하여 제공되는 것일 뿐 본 발명이 하기의 실험예에 한정되는 것은 아니다.The following presents a preferred experimental example to help the understanding of the present invention. However, the following experimental examples are provided only for the purpose of easier understanding of the present invention, and the present invention is not limited to the following experimental examples.

실험예Experimental Example 1 One

먼저, 질화붕소 분말:에탄올을 1:10(weight.%)의 비율로 혼합한 후, 3시간 이상 고속 볼밀하여 질화붕소 코팅액을 제조하였다.First, the boron nitride powder: ethanol was mixed at a ratio of 1:10 (weight.%), And then high-speed ball milling for 3 hours or more to prepare a boron nitride coating solution.

이어서, 코팅액이 담긴 코팅조에 세라믹 롤을 완전히 침지시켜 세라믹 롤의 표면이 코팅액에 충분히 적셔지게 하였다. 그리고 세라믹 롤의 길이 방향으로 세라믹 롤을 코팅조 밖으로 천천히 끌어올렸다.Subsequently, the ceramic roll was completely immersed in the coating bath containing the coating liquid so that the surface of the ceramic roll was sufficiently wetted with the coating liquid. The ceramic roll was slowly pulled out of the coating bath in the longitudinal direction of the ceramic roll.

다음으로, 세라믹 롤을 상온에서 24시간 이상 건조시켰다. 상온에서 건조된 세라믹 롤을 오븐에 넣고 110℃에서 24시간 이상 건조시켰다. 건조된 세라믹 롤을 선반에 장착하여 일정 속도로 회전시키면서 코팅된 롤의 표면을 부드러운 연마포를 이용하여 문질렀다. 그 결과, 코팅된 롤의 표면이 안정화 처리되었다. 그리고, 롤을 공기중 800℃에서 1시간 동안 열처리하였다. 코팅된 롤을 열처리 하는 경우, 롤의 표면과 코팅층 간의 접합력을 향상시킬 수 있다. 이 코팅된 롤은 코팅하지 않은 롤들에 비해 실 조업조건에서 약 20% 정도의 수명 연장 효과가 있었다.Next, the ceramic roll was dried at room temperature for 24 hours or more. The ceramic roll dried at room temperature was put in an oven and dried at 110 ° C. for at least 24 hours. The surface of the coated roll was rubbed with a soft polishing cloth while the dried ceramic roll was mounted on a shelf and rotated at a constant speed. As a result, the surface of the coated roll was stabilized. The roll was then heat treated at 800 ° C. for 1 hour in air. When the coated roll is heat treated, it is possible to improve the adhesion between the surface of the roll and the coating layer. The coated rolls had about 20% longer life under actual operating conditions than uncoated rolls.

세라믹 롤의 표면을 초미세한 질화붕소(BN)로 코팅함으로써 세라믹 롤의 기공을 최소화할 수 있다. 그 결과, 세라믹 롤의 작동시 불순물이 롤 표면에 축적되는 현상 및 롤 내부로의 확산을 억제할 수 있다. 따라서 세라믹 롤의 결정화 및 박리에 따른 롤의 손상을 지연시켜 세라믹 롤의 수명을 연장시킬 수 있다.The pores of the ceramic roll can be minimized by coating the surface of the ceramic roll with ultra-fine boron nitride (BN). As a result, the phenomenon in which impurities accumulate on the roll surface during the operation of the ceramic roll and the diffusion into the roll can be suppressed. Therefore, damage to the roll due to crystallization and peeling of the ceramic roll may be delayed to extend the life of the ceramic roll.

Claims (6)

질화붕소(BN) 분말을 알코올과 혼합 후 분쇄 혼합하여 초미세 질화붕소 코팅액을 제조하는 단계;Preparing an ultrafine boron nitride coating solution by mixing boron nitride (BN) powder with alcohol and then grinding the mixture; 상기 질화붕소 코팅액에 세라믹 롤을 담지하여 상기 롤의 표면을 질화붕소 코팅액으로 코팅하는 단계; 및Coating a surface of the roll with a boron nitride coating liquid by supporting a ceramic roll in the boron nitride coating liquid; And 코팅된 세라믹 롤을 건조 후 소성하는 단계Drying and firing the coated ceramic roll 를 포함하며,/ RTI > 상기 롤의 표면에 형성된 질화붕소 코팅층은 100~150㎛ 인 것을 특징으로 하는 세라믹 롤의 수명연장 방법.Boron nitride coating layer formed on the surface of the roll life extension method of the ceramic roll, characterized in that 100 ~ 150㎛. 제1항에 있어서,The method of claim 1, 상기 질화붕소 코팅액을 제조하는 단계에서,In the step of preparing the boron nitride coating solution, 상기 코팅액은 질화붕소 분말과 에탄올을 포함하는 세라믹 롤의 수명연장 방법.The coating solution is a method for extending the life of the ceramic roll containing boron nitride powder and ethanol. 제2항에 있어서,3. The method of claim 2, 상기 에탄올의 함량이 상기 질화붕소 분말 1g에 대하여 1g 내지 100g인 세라믹 롤의 수명연장 방법.Life cycle extension method of the ceramic roll of the content of the ethanol is 1g to 100g with respect to 1g of the boron nitride powder. 제1항에 있어서,The method of claim 1, 상기 질화붕소 코팅액을 제조하는 단계에서,In the step of preparing the boron nitride coating solution, 상기 질화붕소 입자의 평균입도가 0.5㎛ 내지 10㎛가 되도록 분쇄하는 세라믹 롤의 수명연장 방법.Life-extension method of the ceramic roll which is pulverized so that the average particle size of the boron nitride particles is 0.5㎛ to 10㎛. 제1항에 있어서,The method of claim 1, 상기 질화붕소 코팅액을 제조하는 단계에서,In the step of preparing the boron nitride coating solution, 진공 분위기를 유지시켜 상기 코팅액을 상기 세라믹 롤에 잘 스며들게 하는 세라믹 롤의 수명연장 방법.Life extension method of a ceramic roll to maintain the vacuum atmosphere so that the coating liquid penetrates well into the ceramic roll. 제1항에 있어서,The method of claim 1, 상기 롤의 표면을 질화붕소 코팅액으로 코팅하는 단계, 및 상기 코팅된 세라믹 롤을 건조 후 소성하는 단계를 1회 내지 2회 반복하는 세라믹 롤의 수명연장 방법.Coating the surface of the roll with a boron nitride coating solution, and drying and firing the coated ceramic roll once or twice.
KR1020060130049A 2006-12-19 2006-12-19 METHOD OF LIFE-PROLONGATION OF A CERAMIC ROLL USED FOR CONVEYING Si-STEEL STRIP KR101316906B1 (en)

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KR20040056545A (en) * 2002-12-24 2004-07-01 재단법인 포항산업과학연구원 A method of life-prolongation of ceramic roll used for conveyig si-steel strip
KR20050047082A (en) * 2002-07-31 2005-05-19 이튼 나노베이션 게엠베하 Ceramic coating for combustion boilers

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20050047082A (en) * 2002-07-31 2005-05-19 이튼 나노베이션 게엠베하 Ceramic coating for combustion boilers
KR20040056545A (en) * 2002-12-24 2004-07-01 재단법인 포항산업과학연구원 A method of life-prolongation of ceramic roll used for conveyig si-steel strip

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