KR950008594B1 - Refractories case - Google Patents

Refractories case Download PDF

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Publication number
KR950008594B1
KR950008594B1 KR1019920023994A KR920023994A KR950008594B1 KR 950008594 B1 KR950008594 B1 KR 950008594B1 KR 1019920023994 A KR1019920023994 A KR 1019920023994A KR 920023994 A KR920023994 A KR 920023994A KR 950008594 B1 KR950008594 B1 KR 950008594B1
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South Korea
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alumina
layer
silicon carbide
fireproof
heat
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KR1019920023994A
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Korean (ko)
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KR940014245A (en
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손경호
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주식회사원진
손경호
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/10Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Bag Frames (AREA)

Abstract

The ferric oxide, manganese oxide, magnesium oxide, and zinc oxide are powdered, molded, dried, and heat treated at 1250-1380≰C to make the magnetic ceramic ferrite. The refractory furnace is divided three partitions, the bottom and top partitions are made of alumina and the middle partition is made of silicone carbonate. The alumina layer contains alumina more than 60% and the thickness of it is 1.0-4.0 mm, and the silicone carbonate layer contains the silicone carbonate more than 85% and the thickness of it is 5-10 mm.

Description

자성체 세라믹의 열처리용 내화갑Heat-resistant firebox for magnetic ceramic

제1도는 종래의 열처리용 내화갑을 도시한 사시도.1 is a perspective view showing a conventional heat-resistant saggar.

제2도는 본 발명의 실시예에 관한 열처리용 내화갑을 도시해 놓은 사시도.2 is a perspective view showing a heat-resistant fireproof pack according to an embodiment of the present invention.

제3도는 본 발명의 내화갑을 2층으로 설치해 놓은 일부 종단면도.3 is a partial longitudinal sectional view of the fireproof box of the present invention installed in two layers.

제4도는 제3도의 A 부분을 확대해 놓은 단면도.4 is an enlarged cross-sectional view of part A of FIG.

제5도는 제3도에 도시된 피소성물을 도시해 놓은 사시도이다.FIG. 5 is a perspective view showing the workpiece to be shown in FIG.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

1 : 바닥판 2 : 측면지주1: bottom plate 2: side holding

2' : 측벽 3 : 꼭지점지주2 ': sidewall 3: vertex holder

4 : 통기홈 5 : 피소성물4: ventilation groove 5: fired material

6 : 제1알루미나층 6' : 제2알루미나층6: first alumina layer 6 ': second alumina layer

7 : 탄화규소층7: silicon carbide layer

본 발명은 자성체 세라믹(Ferrite, 영구자석, 전자석, 이하 페라이트라 칭한다) 제품을 소성, 즉 열처리할 때 사용되는 3개의 층으로 형성된 내화갑에 관한 것으로, 더욱 상세하게는 산화철, 산화망간, 산화마그네슘 및 산화아연등을 분말상태로 만들어 선별적으로 특성 및 공정에 알맞게 혼합하여 혼련한 다음 일정한 형태로 성형하여 건조시킨 반제품을 약 1250℃∼1380℃ 정도로 소성(열처리)을 하여 완제품인 페라이트가 생산되는데, 상기 소성 단계에서 피소성물인 페라이트 즉 자성체 세라믹을 담아서 열처리하는데 사용되는 요도구인 열처리용 내화갑에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refractory pack formed of three layers used for firing, ie, heat treating, a magnetic ceramic (Ferrite, permanent magnet, electromagnet, hereinafter ferrite) product, and more particularly, iron oxide, manganese oxide, and magnesium oxide. And zinc oxide, etc. to make powder form, selectively mix and knead according to the characteristics and processes, and then shape and dry the semi-finished product to about 1250 ℃ ~ 1380 ℃ to be fired (heat treatment) to produce ferrite as a finished product. In addition, the firing step relates to a heat-resistant saggar which is a concave material used to contain a heat-treated ferrite, that is, a magnetic ceramic in the firing step.

종래에는 내화갑의 재로로 뮬라이트(Mullite) 또는 뮬라이트-코디어라이트(Mullite-cordierite)를 사용하였으며, 제1도는 종래의 내화갑을 도시한 것이다. 상기 뮬라이트를 사용한 종래의 내화갑은, 내화물이나 요업제품이 열에 견딜 수 있는 온도인 내화도가 약 SK 36으로 낮은 편이며, 재질의 구성상 반복 사용할시에는 제1도에 도시된 바닥판(1)의 휘어지는 현상이 나타나고 또한 균열이 발생함으로 내화갑의 사용수명이 짧아 자주 교체해야 했다. 따라서, 페라이트인 피소성물의 불량발생이 야기되며, 종래의 재질은 열전도율이 낮아서 소성용 턴넬실 가마의 예열대, 소성대, 냉각대를 경과하는 경로에서 내화갑 자체가 소성대에서의 잠열을 안고 있으므로 필요한 온도로 냉각이 원활치 못하여 피소성물인 페라이트에 잔자(residual magnetism, 잔류자기)현상이 있어 페라이트 질의 저하를 가져오기 쉬웠다. 또한 자동이적기에 의해 자동이적을 행하고져 할 경우 제1도에 도시된 기존의 내화갑 측벽(2') 및 측면지주(2)를 제거하게 되는 바, 이는 반복 사용을 하면 열간에서의 하중 및 열충격에 의하여 바닥판(1)이 더욱 쉽게 휘어질 뿐만 아니라 균열이 발생하여 조기에 파손되기 쉽다는 문제점들이 있었다.Conventionally, mullite or mullite-cordierite was used as the ash of the saggar, and FIG. 1 shows a saggar of the saggar. Conventional fireproof packs using the mullite, the temperature of the refractory or ceramic products that can withstand heat is low to about SK 36, the bottom plate (1) shown in FIG. Due to the warpage and cracks, the service life of the saggar was short and had to be replaced frequently. Therefore, the occurrence of defects of the ferrite plastic product is caused, and the conventional material has a low thermal conductivity, so that the saggar itself has latent heat in the firing zone in a path passing through the preheating zone, the firing zone, and the cooling zone of the kiln for kiln. Therefore, it was not easy to cool to the required temperature, and there was a phenomenon of residual magnetism in the ferrite, which is a fired product. In addition, when the automatic transfer is performed by the automatic transfer machine, the existing fireproof side wall 2 'and the side brace 2 shown in FIG. 1 are removed. There was a problem that the bottom plate 1 is not only bent more easily by thermal shock, but also cracks are generated and are easily broken early.

본 발명은 상기와 같은 문제점을 해결하기 위해 발명한 것으로, 자성체 세라믹 제품의 열처리용 내화갑을 알루미나(Al2O3)층을 내외층으로, 탄화규소층을 열간강도가 높고 열 충격 저항성 및 열전도율이 높은 중간층으로 이루어진 3개의 층, 즉 샌드위치형으로 제조하여, 내화도가 SK 39 정도로서 높고 적층된 피소성물을 골고루 열처리할 수 있고 냉각하는 과정에서도 쉽게 냉각이 되어 잔자현상이 없게 함으로 피소성물인 페라이트의 질적 향상을 기할 수 있는 열처리용 내화갑을 제공하고자 함에 그 목적이 있다.The present invention has been invented to solve the above problems, the heat-resistant fireproof sacks of magnetic ceramic products with an alumina (Al 2 O 3 ) layer of the inner and outer layers, the silicon carbide layer has a high hot strength, thermal shock resistance and thermal conductivity Made of three layers consisting of this high intermediate layer, that is, sandwich type, the fire resistance is about SK 39, and the laminated fired material can be heat treated evenly, and it is easily cooled even in the cooling process so that there is no residual phenomenon. The purpose is to provide a heat-resistant saggar that can be improved in quality.

상기와 같은 목적을 달성하기 위하여 본 발명의 내화갑은, 내화갑의 바닥부분을 3개의 층으로 형성시키고 그 상층과 하층을 알루미나(Al2O360% 이상) 질로서 1.0-4.0mm 정도로 제1 및 제2알루미나층(6, 6')을 형성시키고 그 중심부인 중간층을 탄화규소(SiC 85% 이상) 질로 5.0-10.0mm로 탄화규소층(7)을 형성시켜, 중간층 가장자리를 2.0-5.0mm로 좁혀서 바닥부위를 형성시켜 사각판형의 네꼭지점에 지주(3; 다릿발)를 바닥부분의 상하층 재질인 알루미나 질로서 'ㄱ'자 형상으로 완성한 페라이트 열처리용 내화갑인 것이다.In order to achieve the above object, the fireproof sacks of the present invention may be formed of three layers of the bottom portion of the fireproof sacks, and the upper layer and the lower layer may be made of 1.0-4.0 mm of alumina (Al 2 O 3 60% or more). The first and second alumina layers 6 and 6 'are formed, and the middle layer, which is the center thereof, is formed of silicon carbide layer 7 with 5.0-10.0 mm of silicon carbide (SiC 85% or more), and the edge of the intermediate layer is 2.0-5.0. By forming the bottom part by narrowing to mm, it is an alumina-like material made of alumina, which is a material of upper and lower layers at the four corners of the square plate shape, and is made of 'A' shape.

본 발명의 내화갑은, 첫째 열간강도와 열충격 저항성 및 열전도율이 높아서 피소성물을 골고루 열처리할 수 있고, 둘째 냉각하는 과정에서 냉각대로 이동되는 동안 쉽게 냉각이 되므로 소성대에서 피소성물인 페라이트에 잔자현상을 없앨 수 있으며, 세째 상온 및 열간에서의 강도 발현이 우수하므로 반복 사용시 휨현상의 발생 및 파손의 정도가 낮아 내화갑의 수명이 증대되고, 넷째 자동이적기를 설치하여 자동이적을 행할시에 종래의 내화갑에서 측면지주를 제거한 형태로 제조하거나 사용하는데의 문제점이 없어 페라이트의 생산성 및 내화갑의 수명, 즉 사용기간면에서 탁월한 장점을 가진다.The fireproof sacks of the present invention have the first hot strength, high thermal shock resistance, and high thermal conductivity, so that the fired material can be heat treated evenly, and the second one is easily cooled while moving to the cooling zone during the cooling process. Third, because of the excellent strength expression at room temperature and heat, the life span of the fireproof pack is increased due to the low degree of warpage and breakage during repeated use, and the fourth time when the automatic transfer is performed by installing the automatic transfer machine. There is no problem in manufacturing or using the form of removing the side brace from the saggar, and thus has excellent advantages in terms of productivity of ferrite and sag, that is, the period of use.

상기와 바와 같이 본 발명의 내화갑에 의하면, 종래 내화갑이 갖고 있던 문제점을 해결해 내화갑의 수명을 연장시키고 용이한 자동이적으로 페라이트의 생산성 향상을 가져오며 열전도율이 높아 냉각대에서 피소성물의 잔자현상을 방지해 줌으로 페라이트의 불량감소 및 질적인 향상을 가져올 수 있다.As described above, according to the fireproof bag of the present invention, it solves the problems of the conventional fireproof bag, extends the lifespan of the fireproof bag, easily improves the productivity of ferrite, and has a high thermal conductivity. By preventing the phenomenon, it is possible to reduce ferrite defects and improve quality.

이하, 본 발명의 열처리용 내화갑을 첨부된 도면을 따라 아래와 같이 설명한다.Hereinafter, the heat-resistant fireproof sacks of the present invention will be described below with reference to the accompanying drawings.

제2도는 본 발명의 실시예에 관한 열처리용 내화갑을 도시해 놓은 것으로, 본 발명의 내화갑은 2종류의 재질로 평판의 3계층이 일체화되어 바닥면의 하층을 알루미나(Alumina, Al2O3)를 60% 이상 함유한 재질로서 제2알루미나층(6')을 형성하며 그 두께를 1.0-4.0mm로 제조한다.2 is a heat-resistant fireproof sacks according to an embodiment of the present invention, the fireproof sacks of the present invention is made of alumina (Al 2 O), the three layers of the plate is integrated with two kinds of materials 3 ) The second alumina layer 6 'is formed as a material containing 60% or more, and its thickness is manufactured to 1.0-4.0mm.

상기 제2알루미나층(6') 위의 중간층을 탄화규소(Silicon carbide, SiC)를 85% 이상 함유한 재질로서 탄화규소층(7)을 형성하며 그 두께를 5-10mm로 제조한다.The intermediate layer on the second alumina layer 6 'is made of a material containing 85% or more of silicon carbide (SiC) to form the silicon carbide layer 7 and the thickness thereof is 5-10 mm.

상기 탄화규소층(7) 위의 상층을 제2알루미나층(6')과 동일하게 형성하여 제1알루미나층으로 제조한다.The upper layer on the silicon carbide layer 7 is formed in the same manner as the second alumina layer 6 'and manufactured as the first alumina layer.

한편, 제3도에 도시된 'A'부분, 즉 본 발명 내화갑의 바닥 가장자리에 형성되는 탄화규소층(7)의 형성은 제4도에 도시된 바와 같이 4면의 가장자리 끝단을 5-10mm를 2-5mm 정도로 가늘게 처리한다.Meanwhile, the formation of the silicon carbide layer 7 formed at the 'A' portion shown in FIG. 3, that is, the bottom edge of the fireproof bag of the present invention, as shown in FIG. Process thinner to 2-5mm.

그리고, 본 발명 내화갑의 가장자리부분, 제1알루미나층(6)상의 각 4꼭지점에 'ㄱ'자형의 지주(3) 또는 다릿발을 형성시킨다.Then, the edge portion of the fireproof box of the present invention, each of the four vertices on the first alumina layer (6) to form a 'b' shaped pillar (3) or legs.

상기한 바와 같이 완성된 본 발명의 내화갑은 전체 높이가 종래의 내화갑과 동일하나 3층으로 된 바닥면의 두께가 종래의 내화갑보다 약 30-35% 정도 얇게 제조 가능함으로 제3도에 도시된 피소성물(5)의 종류중 높이에 따라 기존 2단으로 적재하던 것을 3단까지 적재할 수 있어 그 품목의 생산능력을 1.5배로 중대시킬 수 있다. 여기서 피소성물(5)은 페라이트로서 제5도에 도시된 바와 같이 형성되어 있다.The fireproof sacks of the present invention completed as described above have the same height as the conventional saggars, but the thickness of the three-layer bottom surface can be manufactured by about 30-35% thinner than the saggars. According to the height of the kind of the to-be-fired material (5) shown in the existing two-stage can be loaded up to three stages can increase the production capacity of the item 1.5 times. Here, the to-be-fired material 5 is formed as ferrite as shown in FIG.

또한 제3도에 도시된 'A'부분과 같이 네면의 가장자리 끝단을 가늘게 처리하여 줌으로써 열간에서 각 층별의 팽창율 차이에 의한 박리현상을 방지하여 줄 뿐 아니라 외부에서 피소성물에서 발생하는 가스와의 접촉을 최대한 방지하여 줄 수 있다.In addition, by treating the edges of the four sides as in the 'A' part shown in FIG. Can be prevented as much as possible.

(실시예)(Example)

본 발명의 내화갑은 그 겉보기 가공율, 부피비중, 상온 및 1350℃에서의 곡강도, 350℃에서의 열전도율, 하중연화점, 1000℃에서의 열간선팽창율, Al2O3, SiO2, SiC의 화학조성비율을 각각 공지의 적정한 방법에 따라 측정한다.The fireproof sacks of the present invention have an apparent processing rate, specific gravity, normal temperature and bending strength at 1350 ° C., thermal conductivity at 350 ° C., load softening point, hot linear expansion rate at 1000 ° C., Al 2 O 3 , SiO 2 , and SiC chemistry. Each composition ratio is measured according to a well-known appropriate method.

(비교예)(Comparative Example)

종래의 내화갑은 그 겉보기 가공율, 부피비중, 상온 및 1350℃에서의 곡강도, 350℃에서의 열전도율, 하중연화점, 1000℃에서의 열간선팽창율, Al2O, SiO2, SiC의 화학조성비율을 상기와 같은 방법으로 측정한다.Conventional fireproof armor has its apparent processing rate, volume specific gravity, room temperature and bending strength at 1350 ° C, thermal conductivity at 350 ° C, load softening point, hot linear expansion rate at 1000 ° C, and chemical composition ratio of Al 2 O, SiO 2 , and SiC. Measured in the same manner as above.

다음 표는 상기 실시예와 비교예의 각각의 특성을 대비한 수치이다.The following table is a numerical comparison of the characteristics of each of the above Examples and Comparative Examples.

[표 1]TABLE 1

Claims (3)

자성체 세라믹의 열처리용 내화갑에 있어서, 내화갑의 바닥부분을 하층, 중간층, 상층으로 일체화시키고, 상기 상층 및 하층을 알루미나 질로 제1 및 제2알루미나층(6, 6')을 형성하고 상기 중간층을 탄화규소질로 탄화규소층(7)을 형성시키며, 가장자리부분의 중간층을 좁혀서 바닥부분을 형성시켜 네 꼭지점에 지주(3; 다릿발)를 'ㄱ'자 형상으로 바닥의 상하층의 알루미나 질과 동일하게 형성하여 제조된 것을 특징으로 하는 자성체 세라믹의 열처리용 내화갑.In the heat resistant fireproof sacks of magnetic ceramics, the bottom portion of the saggars is integrated into a lower layer, an intermediate layer, and an upper layer, and the upper layer and the lower layer are formed of alumina to form first and second alumina layers (6, 6 '), and the intermediate layer. The silicon carbide layer 7 is formed of silicon carbide, and the middle layer of the edge portion is narrowed to form a bottom portion so that the struts (3; legs) at four vertices are 'a' shaped and are the same as the alumina quality of the upper and lower layers of the bottom. Refractory pack for heat treatment of magnetic ceramics, characterized in that formed to form. 제1항에 있어서, 상기 제1 및 제2알루미나층(6, 6')은 알루미나를 60% 이상 함유한 것으로 형성하여 1.0-4.0mm 되게 제조된 것을 특징으로 하는 자성체 세라믹의 열처리용 내화갑.The fireproof sacks for heat treatment of a magnetic ceramic according to claim 1, wherein the first and second alumina layers (6, 6 ') are formed to contain 1.0% or more of alumina to be 1.0-4.0 mm. 제1항에 있어서, 탄화규소층(7)은 탄화규소를 85% 이상 함유한 것으로 형성하여 5-10mm 되게 제조된 것을 특징으로 하는 자성체 세라믹의 열처리용 내화갑.2. The saggar for heat treatment of magnetic ceramics according to claim 1, wherein the silicon carbide layer (7) is formed to contain 85% or more of silicon carbide to be 5-10 mm.
KR1019920023994A 1992-12-11 1992-12-11 Refractories case KR950008594B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101223032B1 (en) * 2011-03-08 2013-01-17 주식회사 우진 Sagger and composition of sagger containing silicon carbide for manufacturing positive, negative electrode active material of secondary battery

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101223032B1 (en) * 2011-03-08 2013-01-17 주식회사 우진 Sagger and composition of sagger containing silicon carbide for manufacturing positive, negative electrode active material of secondary battery

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