KR100544063B1 - sliding plate refractory for flow controling of molten metal - Google Patents
sliding plate refractory for flow controling of molten metal Download PDFInfo
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- KR100544063B1 KR100544063B1 KR1020030056682A KR20030056682A KR100544063B1 KR 100544063 B1 KR100544063 B1 KR 100544063B1 KR 1020030056682 A KR1020030056682 A KR 1020030056682A KR 20030056682 A KR20030056682 A KR 20030056682A KR 100544063 B1 KR100544063 B1 KR 100544063B1
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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
- C04B35/581—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 aluminium nitride
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Abstract
본 발명은 용융 금속의 흐름을 제어하는 슬라이딩 플레이트 내부에 균일하고 미세한 공간을 많이 확보하여 초기 균열 발생을 억제하고, 균열 전파시에는 응력을 흡수하고 분산시켜 기존품에 비해 내열 스폴링성을 비약적으로 향상시키는 것이 가능하고, 품질 편차가 적어 안정 사용이 가능한 내화재로 이루어진 슬라이딩 플레이트에 관한 것이다. The present invention provides a uniform and fine space inside the sliding plate to control the flow of molten metal to suppress the occurrence of initial cracking, absorbing and dispersing stress during crack propagation to significantly reduce the heat spalling resistance compared to conventional products The present invention relates to a sliding plate made of a refractory material which can be improved and has stable quality due to its low quality variation.
이에 따른 구성은 소결알루미나 또는 전융알루미나 35∼86중량%, 4∼0.5mm 입경을 갖는 질화알루미늄 골재 10∼40중량%, 0.5mm 이하의 입경을 갖는 질화알루미늄 1∼10중량%, 탄소 3∼15중량%로 조성됨을 특징으로 하는 용융금속 흐름 제어용 슬라이딩 플레이트 내화재로 이루어진다.The constitution according to the present invention is 35 to 86% by weight of sintered alumina or electrolytic alumina, 10 to 40% by weight of aluminum nitride aggregate having a particle diameter of 4 to 0.5 mm, 1 to 10% by weight of aluminum nitride having a particle diameter of 0.5 mm or less, and 3 to 15 carbon. Sliding plate refractory material for controlling molten metal flow, characterized in that the composition by weight%.
슬라이딩 플레이트. 질화알루미늄.Sliding plate. Aluminum nitride.
Description
도 1은 슬라이딩 플레이트 구조를 나타낸 단면도1 is a cross-sectional view showing a sliding plate structure
도 2a 및 도 2b는 포러스한 질화알루미늄 골재에 대한 현미경 사진2A and 2B are micrographs of porous aluminum nitride aggregates.
도면의 주요부분에 대한 부호의 설명Explanation of symbols for main parts of the drawings
1: 상부노즐 2: 하부노즐 3: 상부 슬라이딩 플레이트1: upper nozzle 2: lower nozzle 3: upper sliding plate
4: 하부 슬라이딩 플레이트4: lower sliding plate
본 발명은 슬라이딩 플레이트 내화재에 관한 것으로, 보다 상세하게는 용융금속의 흐름을 제어하는 장치에 이용되는 슬라이딩 플레이트 내화물에 대하여 용강류 및 비금속 산화물에 대한 내용손, 열충격 및 산화에 따른 균열을 방지하는데 적합한 슬라이딩 플레이트 내화재질에 관한 것이다.The present invention relates to a sliding plate refractory material, and more particularly, to the sliding plate refractories used in the apparatus for controlling the flow of molten metal, to prevent cracking due to the damage, thermal shock and oxidation of molten steel and nonmetal oxides. Sliding plate fireproof material.
일반적으로 래들(ladel) 및 턴디쉬(tundish)하부에는 용강의 배출 및 그 배출을 제어하기 위한 슬라이딩 플레이트 장치가 장착된다.In general, the ladle and the tundish bottom are equipped with a sliding plate device for controlling the discharge of molten steel and its discharge.
즉, 도 1과 같이 상부노즐(1)과 하부노즐(2)이 장착되고 그들 사이에는 내화 재질로된 상부 슬라이딩 플레이트(3)와 하부 슬라이딩 플레이트(4)가 설치된다.That is, as shown in FIG. 1, the upper nozzle 1 and the lower nozzle 2 are mounted, and between them, an upper sliding plate 3 and a lower
이와 같은 상부 및 하부 슬라이딩 플레이트(3, 4)는 주조시간 및 사용회수, 주조후 산소 세척, 강종 등에 따라 그 수명이 결정되는데, 이들 내화재는 주조초 열충격, 케세트 변형, 면압 유지불량, 플레이트의 지지장식, 형상, 래들 또는 턴디쉬의 바닥 평탄도 등에 따른 구속응력의 편차 발생으로 균열이 일어나게 된다.The upper and lower
상기 발생된 균열은 용강류에 질소나 산소의 유입을 초래하여 용강의 품질을 저하시키며, 사용 중 슬라이딩 플레이트(3, 4)내화재의 탈락을 일으켜 제강, 연속 주조시 용강 유출의 문제를 야기시킬 수 있다.The cracks may cause inflow of nitrogen or oxygen into the molten steel, degrading the quality of the molten steel, causing the sliding plates (3, 4) to fall out of the refractory material, and may cause the problem of molten steel leakage during steelmaking and continuous casting. have.
또한 용강류에 의한 마모나 비금속 산화물에 의한 용손, 산화 및 황폐화 현상이 일어나게 되는데 이러한 현상은 내용성 향상을 위해 첨가한 탄소가 사용 중 산화에 의해 탈탄되어 이들 성분에 의한 조직 결합력이 약화되고 이에 따른 공극 현상과 비금속 산화물에 의한 부착이 용이하게 이루어져 슬라이딩 되는 부위의 내화재 구성부분 일부가 용손되는 것이다.In addition, wear caused by molten steel or melt loss, oxidation and deterioration caused by non-metal oxides occur. In this phenomenon, added carbon is decarburized by oxidation during use to weaken tissue binding force due to these components. Part of the refractory material of the sliding part is easily melted due to easy pores and adhesion by non-metal oxides.
상기와 같은 문제점을 해결하기 위한 일환으로서 종래의 슬라이딩 플레이트 내화재의 화학적인 조성은 소결 또는 용융알루미나를 각 입도 분포로 구획하여 주성분으로 하고, 입도가 50㎛ 이하의 가소알루미나, 탄소, 금속실리콘, 산화방지제 금속 등으로 재질을 구성하여 사용한바 있으며, 또한 상기 조성을 개선하기 위하여 본 발명자는 질화알루미늄의 우수한 열전도 특성과 저열팽창 특성을 이용하여 내열 스폴링성을 향상시키며, 질화알루미늄의 용융금속에 잘 젖지 않는 특성과 용강과의 계면에서 용강 중의 산소와 반응하여 알루미나 막을 형성시키고 이로 인해 슬라이 딩 플레이트의 내용성을 향상시키는데 적합한 내화재를 개발한 바 있다.As a part of solving the above problems, the chemical composition of the conventional sliding plate refractory material is divided into sintered or molten alumina into each particle size distribution as the main component, and the plastic alumina, carbon, metal silicon, oxide having a particle size of 50 μm or less In order to improve the composition, the present inventors improve heat spalling resistance by using the excellent thermal conductivity and low thermal expansion of aluminum nitride, and are well wetted by molten metal of aluminum nitride. At the interface between molten steel and molten steel, it has developed a fire-resistant material suitable for forming an alumina film by reacting with oxygen in molten steel, thereby improving the sliding plate's durability.
상기 개발품은 기존에 비하여 용강에 대한 내침식성은 비약적으로 향상되었고, 균열의 폭, 개수 및 각종 스폴링성 시험 방법을 통해 내열충격성을 평가한 결과 기존품에 비하여 동등 이상의 특성을 나타냈다.Compared to the existing products, the corrosion resistance to molten steel has been greatly improved, and thermal shock resistance was evaluated through crack width, number, and various spalling test methods.
그러나 최근 선진 내화물 메이커들의 슬라이딩 플레이트 개발 동향은 내열충격성을 향상시키고, 내침식성은 동등 이상으로 개발하여 수명 향상을 도모하고 있으며, 이를 통한 개선 실적도 발표되고 있다.However, the recent development trend of sliding plate development of advanced refractory makers is to improve the thermal shock resistance, to develop the erosion resistance equal or more to improve the lifespan, and the improvement results through these are also announced.
상기 내열충격성 향상 방법은 지르코니아-멀라이트, 알루미나-지르코니아 등의 지르코니아계 원료를 1∼30중량% 첨가하여 소성하면 원료 자체의 열팽창 수축 특성에 의해 골재 및 주변에 미세한 마이크로 크랙이 발생하고 이 마이크로 크랙이 응력을 흡수하여 열충격 저항성을 높인다는 내용이다.In the method of improving the thermal shock resistance, when 1 to 30% by weight of zirconia-based raw materials such as zirconia-mullite and alumina-zirconia are added and fired, fine microcracks are generated in the aggregate and surroundings due to the thermal expansion and contraction characteristics of the raw materials themselves. This stress is absorbed to increase thermal shock resistance.
상기와 같은 일반적인 기술은 실제 열충격성을 향상시키는데 상당히 효과적이지만 불안정한 원료를 사용하여 일부러 슬라이딩 플레이트에 균열을 발생시키는 방법이므로 외부적인 조건에 따라 미세 균열이 확대되어 불량이 발생하거나 제품마다 특성이 균일하지 않을 가능성이 많다.The general technique as described above is very effective in improving the actual thermal shock, but since it is a method of intentionally causing cracks on the sliding plate using unstable raw materials, fine cracks are enlarged according to external conditions and defects are generated or characteristics are not uniform for each product. There are many possibilities.
본 발명은 상기한 종래의 문제점을 해결하기 위한 것으로, 주성분으로 하는 알루미나에 질화알루미늄를 입도별로 적절히 배합하여 적용함으로서 슬라이딩 플레이트 내부에 균일하고 미세한 공간을 많이 확보하여 초기 균열 발생을 억제하고, 균열 전파시에는 응력을 흡수하고 분산시켜 기존품에 비해 내열 스폴링성을 비약적 으로 향상시키는 것이 가능하고, 품질 편차가 적어 안정 사용이 가능한 내화재를 제공하고자 하는데 그 목적이 있다.The present invention is to solve the above-mentioned conventional problems, by appropriately blending and applying aluminum nitride to the alumina as a main component for each particle size to ensure a large number of uniform and fine space inside the sliding plate to suppress the occurrence of initial cracking, when crack propagation The purpose is to provide a refractory material that can absorb and disperse stresses to significantly improve heat spalling properties compared to existing products, and can be used stably because of less quality variation.
상기한 목적을 달성하기 위한 본 발명은 소결알루미나 또는 전융알루미나 35∼86중량%, 4∼0.5mm 입경분포를 갖는 포러스한 질화알루미늄 11∼40중량%, 0.5mm이하의 미분 입경을 갖는 질화알루미늄 1∼10중량%, 탄소 3∼15중량%로 조성됨을 특징으로 하는 금속 흐름 제어용 슬라이딩 플레이트 내화재로 이루어진다.The present invention for achieving the above object is sintered alumina or electrolytic alumina 35 to 86% by weight, aluminum aluminum nitride having a fine particle size of 11 to 40% by weight of fine aluminum nitride having a particle size distribution of 4 ~ 0.5mm, 0.5mm or less Sliding plate refractory material for metal flow control, characterized in that the composition is composed of ~ 10% by weight, 3 to 15% by weight of carbon.
상기 조성에서 질화알루미늄(AlN) 골재는 일반적으로 사용 중 탄소의 산화에 의한 공극 형성과 조직 결합력 약화로 인한 슬라이딩 되는 부위의 내화재 일부가 용손되는 산화 및 황폐화 현상을 개선하기 위한 용도로 첨가하여 사용한다.In the above composition, aluminum nitride (AlN) aggregate is generally used for the purpose of improving oxidation and deterioration phenomena in which part of the refractory material of the sliding part due to oxidation of carbon and weakening of tissue binding force is dissolved. .
질화알루미늄 골재는 저온 및 고온에서 탄소에 비해 먼저 산화되어 알루미나가 됨으로서 재질 자체의 내침식성에 큰 영향없이 탄소의 산화를 막아주는 용도로도 소량 첨가하여 사용한다.Aluminum nitride aggregate is oxidized to alumina at low temperature and high temperature before it is alumina, so it is used by adding small amount to prevent the oxidation of carbon without significantly affecting the corrosion resistance of the material itself.
본 발명은 바람직하게는 (표 1)과 같은 질화알루미늄의 고유 특성과 도 2와같은 포러스(poros)한 4∼0.5mm 입도분포를 갖는 골재를 10∼40중량% 사용함으로서 내열충격성을 향상시키기 위한 목적으로 사용한다. The present invention preferably uses 10 to 40% by weight of the intrinsic properties of aluminum nitride as shown in Table 1 and aggregates having a porosity of 4 to 0.5 mm in particle size as shown in FIG. 2 to improve thermal shock resistance. Use for purpose.
또한 본 발명은 0.5mm 이하 입도분포를 갖는 질화알루미늄을 1∼10중량% 첨가하여 내산화성 및 내침식성 특성을 극대화하는 것이 가능하다. In addition, the present invention can add 1 to 10% by weight of aluminum nitride having a particle size distribution of 0.5mm or less to maximize oxidation resistance and erosion resistance.
본 발명에 따른 개발품은 슬라이딩 플레이트의 내침식성, 내열충격성을 향상시키는 일반적 방법인 핏치나 레진으로 함침시키는 방법을 통해 제조된 기존품에 비해서도 동등 이상의 특성을 나타냄으로서 제조시간이 기존품 제조 기간의 절반으로 줄었고, 핏치나 레진으로 함친시킨 것에 비해 50% 이상의 수명 향상이 가능하다.The developed product according to the present invention exhibits properties equal to or greater than the conventional products manufactured by the method of impregnating with pitch or resin, which is a general method of improving the corrosion resistance and thermal shock resistance of the sliding plate, so that the manufacturing time is half of the existing manufacturing period. It can be reduced by 50% or more, compared with the pitch or resin.
탄소는 0.02mm보다 큰 입경의 인조흑연 및 인상흑연, 0.2mm 이하의 인상흑연 및 무정형 카본(carbon black)을 사용하는 것이 바람직하다.As the carbon, it is preferable to use artificial graphite and impression graphite having a particle size larger than 0.02 mm, impression graphite of 0.2 mm or less, and amorphous carbon.
상기 제품의 제조는 통상의 조건인 500∼1600℃ 범위에서 비산화분위기 하에서 소성한다.The production of the product is carried out under a non-oxidizing atmosphere in the range of 500 to 1600 ° C. under normal conditions.
다음은 실시예에 따라 설명한다.The following is described according to the embodiment.
이상에서와 같이 본 발명은 주성분으로 하는 소결 또는 용융알루미나에 포러스한 입경을 갖는 질화알리미늄과 미세 입경을 갖는 질화알루미늄을 적절히 배합함으로서 내부에 비교적 균일하고 미세한 공간의 확보로 초기 균열 발생을 억제하고,균열 전파시 포러스한 질화알루미늄 골재에서 응력을 흡수하고 분산시켜 기존품에 비해 내열 스폴링성이 비약적으로 증대되어 균열이 적었고, 내침식성 특성도 향상되어 내용성이 우수함과 함께 내침식성, 내열충격성을 향상시키는 일반적인 방법인 핏치나 레진으로 함침시키는 기존의 슬라이딩 플레이트에 비해 50% 이상의 수명향상이 가능하였다. As described above, according to the present invention, by appropriately mixing aluminum nitride having a pore size and aluminum nitride having a fine particle size in the sintered or molten alumina as a main component, it is possible to suppress initial cracking by securing a relatively uniform and fine space therein. When absorbing and dispersing stress in the porous aluminum nitride aggregate during crack propagation, the thermal spalling resistance is greatly increased compared to the existing products, resulting in less cracking, improved corrosion resistance characteristics, and excellent corrosion resistance and thermal shock resistance. It is possible to improve the service life by more than 50% compared to the conventional sliding plate impregnated with pitch or resin, which is a general method of improving the temperature.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020030056682A KR100544063B1 (en) | 2003-08-16 | 2003-08-16 | sliding plate refractory for flow controling of molten metal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020030056682A KR100544063B1 (en) | 2003-08-16 | 2003-08-16 | sliding plate refractory for flow controling of molten metal |
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| KR20050018266A KR20050018266A (en) | 2005-02-23 |
| KR100544063B1 true KR100544063B1 (en) | 2006-01-23 |
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| CN107673767B (en) * | 2017-09-29 | 2020-10-02 | 马鞍山利尔开元新材料有限公司 | Low-carbon aluminum sliding plate added with magnesium-calcium-aluminum sand and preparation method thereof |
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