KR100305610B1 - Low Elastic High Oxidation Magnesia-Carbon Refractory - Google Patents

Low Elastic High Oxidation Magnesia-Carbon Refractory Download PDF

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KR100305610B1
KR100305610B1 KR1019980056944A KR19980056944A KR100305610B1 KR 100305610 B1 KR100305610 B1 KR 100305610B1 KR 1019980056944 A KR1019980056944 A KR 1019980056944A KR 19980056944 A KR19980056944 A KR 19980056944A KR 100305610 B1 KR100305610 B1 KR 100305610B1
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magnesia
resistance
refractory
graphite
carbon refractory
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KR20000041154A (en
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이승제
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신승근
주식회사 포스렉
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    • 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
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/03—Shaped 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 magnesium oxide, calcium oxide or oxide mixtures derived from dolomite
    • C04B35/04—Shaped 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 magnesium oxide, calcium oxide or oxide mixtures derived from dolomite based on magnesium oxide
    • C04B35/043—Refractories from grain sized mixtures
    • 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
    • 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
    • C04B35/52—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 carbon, e.g. graphite
    • C04B35/522—Graphite
    • 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
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • 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
    • C04B35/63—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
    • C04B35/632—Organic additives
    • 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
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/40—Metallic constituents or additives not added as binding phase

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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)
  • Inorganic Chemistry (AREA)
  • Compositions Of Oxide Ceramics (AREA)

Abstract

본 발명은 저탄성 고내산화성 마그네시아-카본질 내화물에 관한 것으로, 특히 상기 마그네시아-카본질 내화물에 포함되는 흑연의 최대결함인 산화성을 억제함과 동시에 내스폴링성 및 내식성 향상을 목적으로 마그네시아 내화재 75∼95중량%와, 흑연 5∼25중량%에, 배합비외로 B4C계의 비산화성 붕소화합물을 함유한 피치계 분말(B203환산:5∼50%) 0.5∼5중량%와, 산화방지제로서 Al, Si, Mg-Al, Al-Si 등의 금속중 단독 혹은 1종이상의 혼합물 1∼6중량%와, 결합제로서 페놀계 화합물을 첨가하여 이루어진 저탄성 고내산화성 마그네시아-카본질 내화물을 제공한다.The present invention relates to a low-elasticity, high oxidation-resistant magnesia-carbon refractory, in particular, magnesia refractory material 75 ~ to improve the spalling resistance and corrosion resistance while suppressing the oxidative resistance, which is the largest defect of graphite contained in the magnesia-carbon refractory 0.5 to 5 wt% of a pitch-based powder (B 2 0 3 equivalent: 5 to 50%) containing 95 wt% and 5 to 25 wt% of graphite, in addition to the blending ratio, containing a B 4 C non-oxidizing boron compound Provides a low-elasticity, high oxidation-resistant magnesia-carbon refractory material formed by adding 1 to 6% by weight of a single or one or more mixtures of metals such as Al, Si, Mg-Al, and Al-Si as an inhibitor and a phenolic compound as a binder. do.

Description

저탄성 고내산화성 마그네시아-카본질 내화물Low Elastic High Oxidation Magnesia-Carbon Refractory

본 발명은 저탄성 고내산화성 마그네시아-카본질 내화물에 관한 것으로, 특히 상기 마그네시아-카본질 내화물에 포함되는 흑연의 최대결함인 산화성을 억제함과 동시에 내스폴링성을 향상시킨 저탄성 고내산화성 마그네시아-카본질(이하 MgO-C질)내화물에 관한 것이다.The present invention relates to a low elastic high oxidation resistant magnesia-carbon refractory, and in particular, a low elasticity high oxidation resistant magnesia-car which suppresses the oxidative property, which is the maximum defect of graphite contained in the magnesia-carbon refractory, and improves spalling resistance. Essence (hereinafter referred to as MgO-C) refractory.

통상적으로, 전로 및 전기로 혹은 기타 제강로용 내장재로서 널리 사용되는 MgO-C질 내화물은 산소가 존재하는 분위기 하에서 카본(Carbon)이 산화되기 쉽다는 결함을 갖는다.Typically, MgO-C quality refractory materials widely used as interior materials for converters and electric furnaces or other steelmaking furnaces have a defect that carbon is easily oxidized in the presence of oxygen.

이에, 상기 MgO-C질 내화물의 내산화성 향상을 위한 수단으로 Al, Si, Mg-Al, Al-Si등과 같이 흑연보다 산화 치환력이 높은 금속을 첨가하면 효과가 있는 것으로 확인되고 있다.Therefore, it is confirmed that the addition of a metal having a higher oxidation substitution power than graphite, such as Al, Si, Mg-Al, Al-Si, as a means for improving the oxidation resistance of the MgO-C nitride refractory.

그러나, 최근의 제강조업시에는 2차연소를 수반하기 때문에 상기 2차연소에 따른 고온에 의하여 제강로용 내장재로서의 MgO-C질 내화물이 현저하게 강한 산화성 분위기 하에서 사용되는 조건에 있게 되는데, 이와같은 조건하에서는 상기한 금속의 첨가만으로는 카본의 산화를 충분히 억제하기 곤란하고, 또한 탈탄층의 형성속도가 크며, 이 탈탄층으로 슬래그(Slag)의 공격을 받아서 침식이 심하게 일어난다.However, in the recent steelmaking industry, secondary combustion is accompanied, so that MgO-C refractories as interior materials for steelmaking furnaces are used under a significantly strong oxidizing atmosphere due to the high temperature caused by the secondary combustion. It is difficult to sufficiently inhibit the oxidation of carbon only by the addition of the above metals, and the formation rate of the decarburized layer is high, and erosion occurs severely due to slag attack by the decarburized layer.

또한, 동시에 가동부의 미탈탄층은 고온조업에 따른 금속의 반응생성물에 의하여 내부 소결이 빠르게 진행되므로써, 열적 스폴링에 의한 표면 박리가 발생하여 내화물의 손모속도가 현저히 증가하는 문제점이 있었다.In addition, at the same time, since the internal sintering is rapidly progressed by the reaction product of the metal due to the high temperature operation of the volatile metal layer of the movable part, surface peeling occurs due to thermal spalling, and thus, the wear rate of the refractory is significantly increased.

이에, 본 발명은 상기와 같은 문제점을 해소하기 위하여 안출된 것으로서, 산화가 강한 분위기하에서도 우수한 내산화성 및 내스폴링성을 가지며, 더 나아가서는 우수한 내식성을 갖도록 하는 저탄성 및 고내산화성의 MgO-C질 내화물을 제공하는데 그 목적이 있다.Accordingly, the present invention has been made in order to solve the above problems, has excellent oxidation resistance and spalling resistance even in a strong oxidation atmosphere, and furthermore, low elasticity and high oxidation resistance MgO-C to have excellent corrosion resistance The purpose is to provide vaginal refractory.

상기와 같은 목적을 달성하기 위한 본 발명은 마그네시아 내화재와 흑연을 주원료로 사용하고, 첨가제로서 B4C계의 비산화성 붕소화합물을 함유한 피치계 분말을 사용하며, 산화방지제로서 Al, Si, Mg-Al, Al-Si 등의 금속을 단독 혹은 1종이상 혼합첨가함과 아울러 결합제로서 페놀계 화합물을 사용하여 달성되는 것을 특징으로 한다.In order to achieve the above object, the present invention uses a magnesia refractory material and graphite as the main raw materials, and uses a pitch-based powder containing a B 4 C-based non-oxidizing boron compound as an additive, Al, Si, Mg as an antioxidant It is characterized in that it is achieved by using a phenol-based compound as a binder or adding one or more kinds of metals, such as -Al and Al-Si.

이하, 본 발명에 대한 바람직한 실시예를 상세히 설명한다.Hereinafter, preferred embodiments of the present invention will be described in detail.

본 발명은 상기한 종래의 문제점을 해결하기 위하여 마그네시아 내화재 75∼95중량%와, 흑연 5∼25중량%의 배합비외에 B4C계의 비산화성 붕소화합물을 함유한 피치계 분말(B203환산:5∼50%) 0.5∼5중량%와, 산화방지제로서 Al, Si, Mg-Al, Al-Si 등의 금속을 단독 혹은 1종이상 1∼6중량%를 혼합첨가하며, 결합제로서 페놀계 화합물을 사용하여 이루어지는 것을 특징으로 한다.The present invention, in order to solve the above-mentioned problems, the pitch-based powder containing 75 to 95% by weight of magnesia refractory material and non-oxidizing boron compound of B 4 C-based in addition to the mixing ratio of 5 to 25% by weight of graphite (B 2 0 3 5 to 50%), 0.5 to 5% by weight, and metals such as Al, Si, Mg-Al, and Al-Si alone or mixed with one or more kinds of 1 to 6% by weight as an antioxidant; It is characterized by using a system compound.

즉, 본 발명은 배합물중 B4C의 비산화성 붕소화합물을 함유한 피치계 분말(B203환산:5∼50%)을 첨가함에 따라서 내산화성을 향상시키고, 동시에 탄성율을 낮추므로써 내스폴링성을 효과적으로 발휘시키는 것이다.That is, the present invention improves oxidation resistance by adding a pitch-based powder (B 2 0 3 equivalent: 5 to 50%) containing a non-oxidizing boron compound of B 4 C in the blend, thereby reducing the elastic modulus and spalling resistance. It is to effectively exercise sex.

이와 같이, 상기 B4C계의 비산화성 붕소화합물을 함유한 피치계 분말의 첨가에 있어서 상기한 바와같은 효과가 생기는 것은 다음과 같은 이유에 있다.As described above, the above-described effects occur in the addition of the pitch-based powder containing the B 4 C-based non-oxidizing boron compound.

B4C 및 BN계의 비산화성 붕소화합물을 함유한 피치계 분말은 사용중의 저산소분압하에서 B4C 및 BN 등의 비산화성 붕소산화물을 B4C+6CO=2B203+7C---(1)의 반응에 의해서 카본을 석출하며 공히 붕소산화물을 형성하여 체적팽창을 수반하기 때문에 치밀화로 기공의 밀폐화를 촉진하며, 이때 생성된 B203은 MgO-B203계 화합물로 되어 액상을 생성함으로써, 내화물 표면에 산화보호층을 형성한다.B 4 C, and pitch-based powder containing a non-acidic boron compound is of the BN type under a low oxygen partial pressure during use of the B 4 C and a non-acidic oxide such as boron BN B 4 C + 6CO = 2B 2 0 3 + 7C --- Due to the reaction of (1), carbon precipitates and forms a boron oxide, which entails volume expansion, thereby facilitating the sealing of pores by densification, and the produced B 2 0 3 is a MgO-B 2 0 3 -based compound. Thereby forming a liquid phase, thereby forming an oxide protective layer on the refractory surface.

또한 동시에 피치계 분말은 가열중 흑연화 과정에 의하여 공극이 내포한 탄소입자를 매트릭스(Matrix)중에 형성시킴으로써 탄성율을 저하시키는 효과를 발현하여 내스폴링성을 향상시킨다.At the same time, the pitch powder exhibits the effect of lowering the elastic modulus by forming carbon particles containing pores in the matrix by the graphitization process during heating, thereby improving spalling resistance.

따라서, 본 발명은 붕소화합물을 함유한 피치계 분말을 흑연조직내에 첨가함으로써, 흑연의 산화보호층 형성 및 저탄성율화로 산화방지 효과 및 내스폴링성을 비약적으로 향상시킨 것이다.Accordingly, the present invention significantly improves the anti-oxidation effect and spalling resistance by forming an oxide protective layer and lowering elastic modulus of graphite by adding a pitch-based powder containing a boron compound into the graphite structure.

다음에, 본 발명에 이용된 배합원료의 구체예 및 한정이유에 대하여 서술한다.Next, the specific example and the reason for limitation of the compounding raw material used for this invention are described.

또 이하에 표시된 %는 모두 중량비율에 의한 것임을 밝혀둔다.In addition, it is clear that all the% shown below is by weight ratio.

마그네시아 내화재는 전융품, 소결품등이 사용가능 하지만, 될 수 있으면 고순도 또한 천연 마그네시아 결정 크기가 큰 것이 바람직하다. 사용량은 75∼95%이다.Magnesia refractory materials can be used as molten or sintered products, but high purity and natural magnesia crystals are preferred if possible. The amount used is 75 to 95%.

이 경우에 사용되는 흑연은 비정질 및 결정질등이 사용가능하지만, 될 수 있으면 천연산 인상흑연 및 강제조시 나오는 탄소 집진분을 정제해서 만든 키쉬(Kish) 인상흑연도 사용가능하며 불순물이 거의 없는 고순도 결정형 흑연을 사용하는 것이 내식성에 바람직하다.The graphite used in this case may be amorphous or crystalline, but if possible, it is also possible to use a natural impression graphite and Kish impression graphite which is made by refining carbon dust from forced preparation. It is preferable to use graphite for corrosion resistance.

상기 MgO-C질 내화물의 인상흑연 사용량은 5∼25%이지만, 더욱이 바람직한 것은 10∼20%이다. 이는 인상흑연 사용량이 5%이하에서는 슬래그에 대한 내침식저항성 및 내스폴링성이 떨어지게 되며, 또한 상기 인상흑연 사용량이 25%를 초과하면 혼련이 균일하게 되기 어렵고, 성형시 최밀충전성이 떨어져서 물성의 저하를 초래하여 내식성 및 내산화성의 저하를 가져오기 때문이다.Although the usage-amount of the graphite which raises the said MgO-C quality refractory is 5 to 25%, Furthermore, 10 to 20% is preferable. This is because when the amount of the graphite used is less than 5%, the erosion resistance and spalling resistance to the slag is lowered, and when the amount of the graphite used is more than 25%, the kneading becomes difficult to be uniform, and the closest filling property during molding is poor. This is because it leads to a decrease in corrosion resistance and oxidation resistance.

한편, B4C계의 비산화성 붕소화합물을 함유한 피치계 분말의 사용량은 0.5∼5%이다. 이는 상기 B4C계의 비산화성 붕소화합물을 함유한 피치계 분말의 사용량이 0.5%보다 적으면 내산화성 및 내스폴링성이 떨어지고, 5%이상이면 MgO-B203계 화합물의 생성량이 많게되어 내식성이 떨어지고 내스폴링성도 저하되기 때문이다.On the other hand, the amount of the pitch-based powder containing the B 4 C non-oxidizing boron compound is 0.5 to 5%. This is because when the amount of the P-based powder containing the B 4 C-based non-oxidizing boron compound is less than 0.5%, the oxidation resistance and spalling resistance are inferior, and when it is 5% or more, the amount of MgO-B 2 O 3 -based compound is increased. This is because corrosion resistance is lowered and spalling resistance is also lowered.

또한, 산화방지제로서 Al, Si, Mg-Al, Al-Si 등의 금속을 단독 혹은 1종이상을 1∼6%혼합사용 하는 것이 좋다. 이는 상기 Al, Si, Mg-Al, Al-Si 등의 금속을 단독 혹은 1종이상 혼합한 사용량이 1%보다 적으면 내산화성이 불충분하고, 6%를 초과하면 내스폴링성이 크게 저하하고 동시에 첨가금속의 산화생성물이 필요이상으로 생성되어 슬래그에 대한 침식 저항성이 떨어지기 때문이다.In addition, it is good to use 1 to 6% of single metals, such as Al, Si, Mg-Al, Al-Si, or 1 or more types as antioxidant. When the amount of the Al, Si, Mg-Al, Al-Si, and other metals used alone or in combination of one or more is less than 1%, the oxidation resistance is insufficient, and if it exceeds 6%, the spalling resistance is greatly reduced and This is because the oxidized product of the additive metal is produced more than necessary, and the erosion resistance to slag is reduced.

또, 본 발명은 상기와 같은 배합물에 결합제로서 페놀계 화합물을 배합외에 5%를 첨가하여 상온 혼련, 필요에 따라서는 가열혼련하여 소망의 형상으로 진공 마찰 프레스기로 성형하여 200℃에서 48시간 열처리하여 얻어진다.In addition, the present invention adds 5% of the phenolic compound as a binder to the compound as described above in addition to the compounding mixture, and kneading at room temperature, if necessary, by heat-kneading to form a vacuum friction press in a desired shape and heat-treated at 200 ° C. for 48 hours. Obtained.

이와 같이, 본 발명에 따라 저탄성을 갖는 고내산화성 마그네시아-카본질 내화물의 원료구성 및 이에 따른 효과를 표 1에 나타내었다.Thus, according to the present invention, the raw material composition of the high-oxidation-resistant magnesia-carbon refractory having low elasticity and the effects thereof are shown in Table 1.

표 1의 실시예(1∼6)와 비교예(A∼D)에 나타낸 바와같이 비산화성 붕소화합물을 함유한 피치계 분말의 사용량이 증가할수록 상기 비산화성 붕소화합물을 함유한 피치계 분말을 전혀 사용하지 않은 비교예 A,B보다 내산화성은 크게 향상됨과 더불어 탄성율의 저하와 동시에 내식성도 향상되는 효과가 나타난다.As shown in Examples (1 to 6) and Comparative Examples (A to D) of Table 1, the pitch-based powder containing the non-oxidizing boron compound was increased as the amount of the pitch-based powder containing the non-oxidizing boron compound increased. Oxidation resistance is greatly improved compared with Comparative Examples A and B which are not used, and the effect of lowering the elastic modulus and the corrosion resistance is also improved.

그러나, 비교예 C와 D에서와 같이 비산화성 붕소화합물을 함유한 피치계 분말을 상기에서 한정한 0.5∼5중량%의 범위외로 첨가하면, 상기 비산화성 붕소화합물을 함유한 피치계 분말의 사용효과가 적어서 내식성 및 내스폴링성이 동일하거나 떨어지는 것으로 나타난다.However, when the pitch powder containing the non-oxidizing boron compound is added outside the range of 0.5 to 5% by weight as defined above in Comparative Examples C and D, the effect of using the pitch powder containing the non-oxidizing boron compound The corrosion resistance and spalling resistance appear to be the same or inferior.

저탄성 고내산화성 마그네시아-카본질 내화물의 원료구성 및 품질특성Raw Material Composition and Quality Characteristics of Low Elastic High Magnesia-Carbon Refractories 본발명Invention 실시예Example 비교예Comparative example 1One 22 33 44 55 66 AA BB CC DD 원료구성Raw material composition 마그네시아(5mm이하)인상흑연(100mesh이상)Magnesia (less than 5mm) Impression graphite (more than 100mesh) 90109010 85158515 85158515 80208020 80208020 80208020 85158515 80208020 80208020 80208020 피치계 분말(B4C함유)Al(200mesh이하)Mg-Al(100mesh이하)Pitch-based powder (containing B 4 C) Al (200 mesh or less) Mg-Al (100 mesh or less) 122122 0.5220.522 222222 122122 322322 522522 -22-22 -22-22 0.3220.322 622622 품질특성Quality characteristic 부피비중겉보기기공율(%)압축강도(Kg/cm2)Volume specific gravity Porosity (%) Compressive strength (Kg / cm 2 ) 2.951.93902.951.9390 2.922.33842.922.3384 2.902.43822.902.4382 2.872.23462.872.2346 2.842.33152.842.3315 2.822.53322.822.5332 2.932.033782.932.03378 2.882.33492.882.3349 2.872.23502.872.2350 2.802.53122.802.5312 곡강도(Kg/cm2)1400℃Bending strength (Kg / cm 2 ) 1400 ℃ 138138 135135 147147 136136 148148 154154 128128 122122 122122 112112 산화감량(%) *1Oxidation loss (%) * 1 5.85.8 9.39.3 7.57.5 10.310.3 7.87.8 5.95.9 10.710.7 13.213.2 13.213.2 5.35.3 탄성율(GPa)1400℃ *2Elastic modulus (GPa) 1400 ℃ * 2 35.335.3 34.234.2 32.732.7 33.233.2 31.431.4 33.433.4 38.638.6 36.836.8 36.936.9 38.738.7 내식성 침식지수 *3Corrosion Resistance Erosion Index * 3 103103 9898 9696 9393 8989 8888 105105 100100 100100 122122 내스폴링성 박리회수 *4균열정도Spalling resistance Peeling number * 4 11소11 small 12중12th 12소12 small 13소13 small 14소14 small 13소13 small 10소10 cows 12대12 spaces 11소11 small 9대9 spaces

*1 : 전기로 산화시험* 1: Oxidation test with electricity

[시험조건 : 1400℃×5시간, 대기분위기, 샘플크기:40×40×40mm][Test conditions: 1400 ℃ × 5 hours, atmosphere, sample size: 40 × 40 × 40mm]

*2 : 초음파탄성율 시험* 2: Ultrasonic modulus test

[시험조건:1400℃×2시간, 질소분위기, 샘플크기:지름(30mm)×높이(50mm)][Test conditions: 1400 ℃ × 2 hours, nitrogen atmosphere, sample size: diameter (30mm) × height (50mm)]

*3 : 고주파유도로 시험* 3: High frequency induction test

[시험조건 : 1700℃×30분×6회, CaO/SiO2=3.3, T.Fe=18%][Test conditions: 1700 ℃ × 30 minutes × 6 times, CaO / SiO 2 = 3.3, T.Fe = 18%]

*4 : 용선침전법* 4: molten iron precipitation method

[시험조건 : 1600℃용선중 30초침적 *수냉15초→실온중에 15초방냉[Test conditions: 30 seconds deposition in the 1600 ℃ molten iron * 15 seconds cooling water → 15 seconds cooling at room temperature

이공정 사이클을 시료가 박리될 때까지 반복함. 박리회수가This process cycle is repeated until the sample is peeled off. Peeling Recovery

많은 쪽이 내스폴링성이 우수하다. 샘플크기:40×40×230mm]Many have excellent spalling resistance. Sample size: 40 × 40 × 230 mm]

*균일정도 : 나쁨←대>중>소 →양호* Uniformity: Poor ← Large> Medium> Small → Good

이상에서 설명한 바와같이, 본 발명에 따라 제조된 저탄성 마그네시아-카본질 내화물은 산화가 강한 분위기하에서 우수한 내산화성 및 내스폴링성을 가지며, 더 나아가서는 우수한 내식성을 갖게 되는 효과가 있다.As described above, the low-elastic magnesia-carbon refractory prepared according to the present invention has an excellent oxidation resistance and spalling resistance under a strong oxidation atmosphere, and further has an effect of having excellent corrosion resistance.

Claims (1)

마그네시아 내화재 75∼95중량%와, 흑연 5∼25중량%에, 배합비외로 B4C계의 비산화성 붕소화합물을 함유한 피치계 분말(B203환산:5∼50%) 0.5∼5중량%와, 산화방지제로서 Al, Si, Mg-Al, Al-Si 등의 금속중 단독 혹은 1종이상의 혼합물 1∼6중량%와, 결합제로서 페놀계 화합물을 첨가하여 이루어지는 것을 특징으로 하는 저탄성 고내산화성 마그네시아-카본질 내화물.And 75-95% by weight of magnesia refractory, pitch-based powder on a graphite 5-25% by weight, containing a non-acidic boron compound of B 4 C-based blend ratio outside of (B 2 0 3 in terms of: 5 to 50%), 0.5-5 %, 1 to 6% by weight of a mixture of one or more of one or more of metals such as Al, Si, Mg-Al, Al-Si as an antioxidant, and a phenolic compound as a binder is added. Oxidative magnesia-carbon refractory.
KR1019980056944A 1998-12-21 1998-12-21 Low Elastic High Oxidation Magnesia-Carbon Refractory KR100305610B1 (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101203630B1 (en) * 2004-10-07 2012-11-23 주식회사 포스코 Improvement of oxidation resistance of pitch for castable refractories
KR101280017B1 (en) * 2011-12-21 2013-06-28 (주)포스코켐텍 Air permeable refractory for repairing mhp of converter
KR101429056B1 (en) 2012-12-12 2014-08-11 (주)포스코켐텍 Magnesia-carbon refractory material
CN111732416A (en) * 2020-08-28 2020-10-02 北京利尔高温材料股份有限公司 Ultralow-carbon magnesia carbon brick with excellent oxidation resistance and stripping resistance for ladle lining and preparation method thereof

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100689154B1 (en) * 2005-12-22 2007-03-02 주식회사 포스코 Refractory materials for mgo-c brick

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Publication number Priority date Publication date Assignee Title
JPH0585805A (en) * 1991-09-27 1993-04-06 Harima Ceramic Co Ltd Carbon-containing fire-resistant material

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0585805A (en) * 1991-09-27 1993-04-06 Harima Ceramic Co Ltd Carbon-containing fire-resistant material

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101203630B1 (en) * 2004-10-07 2012-11-23 주식회사 포스코 Improvement of oxidation resistance of pitch for castable refractories
KR101280017B1 (en) * 2011-12-21 2013-06-28 (주)포스코켐텍 Air permeable refractory for repairing mhp of converter
KR101429056B1 (en) 2012-12-12 2014-08-11 (주)포스코켐텍 Magnesia-carbon refractory material
CN111732416A (en) * 2020-08-28 2020-10-02 北京利尔高温材料股份有限公司 Ultralow-carbon magnesia carbon brick with excellent oxidation resistance and stripping resistance for ladle lining and preparation method thereof

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