KR970001264B1 - Boron nitride ceramics and molten metal container composed of members made of the said ceramics - Google Patents

Boron nitride ceramics and molten metal container composed of members made of the said ceramics Download PDF

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KR970001264B1
KR970001264B1 KR1019890700006A KR890700006A KR970001264B1 KR 970001264 B1 KR970001264 B1 KR 970001264B1 KR 1019890700006 A KR1019890700006 A KR 1019890700006A KR 890700006 A KR890700006 A KR 890700006A KR 970001264 B1 KR970001264 B1 KR 970001264B1
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molten metal
container
protective cap
hole
ceramics
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KR890701498A (en
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마사쯔미 나까시마
미쓰노리 구스모도
스미히꼬 구리다
히로시 나까무라
가쯔미 우라
아끼라 무라다
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가부시끼가이샤 고오란샤
원본미기재
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Priority claimed from JP62325007A external-priority patent/JPH01167592A/en
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Priority claimed from PCT/JP1988/000453 external-priority patent/WO1988008831A1/en
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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
    • C04B35/515—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
    • 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
    • F27B14/00—Crucible or pot furnaces
    • F27B14/08—Details peculiar to crucible or pot furnaces
    • F27B14/10—Crucibles
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
    • C03B5/16—Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces
    • C03B5/167—Means for preventing damage to equipment, e.g. by molten glass, hot gases, batches
    • C03B5/1672—Use of materials therefor
    • 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
    • C04B35/58—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
    • C04B35/583—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 boron nitride
    • 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
    • F27B14/00—Crucible or pot furnaces
    • F27B14/08—Details peculiar to crucible or pot furnaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • 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
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/0003—Linings or walls
    • F27D1/0006—Linings or walls formed from bricks or layers with a particular composition or specific characteristics
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • 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
    • F27D21/00—Arrangements of monitoring devices; Arrangements of safety devices
    • F27D21/02—Observation or illuminating devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • 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
    • F27D21/00—Arrangements of monitoring devices; Arrangements of safety devices
    • F27D21/02—Observation or illuminating devices
    • F27D2021/026—Observation or illuminating devices using a video installation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • 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
    • F27D21/00—Arrangements of monitoring devices; Arrangements of safety devices
    • F27D21/0014—Devices for monitoring temperature

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  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Structural Engineering (AREA)
  • Closures For Containers (AREA)
  • Ceramic Products (AREA)
  • Measuring Temperature Or Quantity Of Heat (AREA)

Abstract

내용없음No content

Description

[발명의 명칭][Name of invention]

BN계 세라믹스 및 이 세라믹스제 부재를 구비한 용탕용기Molten container provided with BN ceramics and this ceramic member

[도면의 간단한 설명][Brief Description of Drawings]

제1도는 BN 세라믹스중의 AIN 함유량과 용손량과이 관계를 표시한 그래프이다.1 is a graph showing the relationship between the AIN content and the melt loss in BN ceramics.

제2도는 본 발명조성의 BN계 세라믹스로 형성한 용탕온도측정용 열전대의 보호캡를 사용한 용탕용기의 일부를 표시한 단면도이다.2 is a cross-sectional view showing a part of a molten metal container using a protective cap of a thermocouple for molten metal temperature measurement formed of BN-based ceramics of the present invention.

제3도는 제2도에 표시한 구조의 변형예를 표시한 도이다.3 is a diagram showing a modification of the structure shown in FIG.

제4도는 제3도에 표시한 구조의 변형예를 표시한 도이다.4 is a diagram showing a modification of the structure shown in FIG.

[발명의 상세한 설명]Detailed description of the invention

[기술분야][Technical Field]

본 발명은 금속 또는 다른 무기재료의 용융체에 대한 내용손성(耐溶損性)이 뛰어난 BN계 세라믹스 및 그의 응용예에 관한 것이다.The present invention relates to a BN-based ceramics excellent in solvent resistance to melts of metals or other inorganic materials and applications thereof.

[배경기술][Background]

BN계 세라믹스는 금속, 유리 등이 용융체에 대한 내젖음성이 극히 우수한 재료인 것이 알려져 있다.It is known that BN-based ceramics are materials of which metal, glass and the like are extremely excellent in wet resistance to the melt.

내젖음성이 우수한 BN계 세라믹스는 노용 재료로서 범용이 될 것이지만, 실제에는 그의 사용을 방해하는 몇 가지의 요인이 있다.BN-based ceramics having excellent wet resistance will be used as general purpose materials for labor, but there are a few factors that actually hinder their use.

제1요인, 종래의 BN계 세라믹스로 형성된 부재가 금속, 유리 등의 용융체와 접하면, 그 접촉부에 있어서 용이하게 용손하기 때문이다.The first reason is that, when a member formed of conventional BN-based ceramics comes into contact with a melt such as metal or glass, it is easily melted in the contact portion.

제2요인은, 종래의 BN계 세라믹스를 대기압하에서 소결하여 얻은 부재의 강도가 지나치게 낮아서 전혀 사용에 견디지 못하여, 핫프레스에 의하여 BN계 세라믹스 부재를 제조하는 것이 보통이며, 그 제조경비가 비싸지게 되기 때문이다.The second factor is that the strength of the member obtained by sintering conventional BN ceramics under atmospheric pressure is too low to endure the use at all, and it is common to manufacture the BN ceramics member by hot pressing, and the manufacturing cost becomes expensive. Because.

한편, 용탕용기내의 금속용탕의 온도를 연속적으로 측온하기 위해서는 용탕중에 침지한 열전대에 의하는 것이 보통이다, 열전대는 보호관내에서 삽입되어서 보호관과 같이 용탕중에 차입된다.On the other hand, in order to continuously measure the temperature of the molten metal in the molten metal container, it is common to use a thermocouple immersed in the molten metal. The thermocouple is inserted into the protective tube and charged into the molten metal like the protective tube.

그러나 보호관을 사용하는 것에 관하여 다음의 문제가 있다.However, there are the following problems with the use of sheaths.

① 용강과 같은 고온의 용탕중에 차입된 종래의 보호관은 단시간내에서 침식되기 쉽기 때문에, 연속측온을 행하는 것이 어렵다.(1) Since a conventional protective tube embedded in hot molten metal such as molten steel is likely to be eroded within a short time, continuous temperature measurement is difficult.

② 통상의 경우, 보호관은 용탕의 표면해서 내부에 차입되어, 지지부재에 의하여 부동으로 지지된다. 이 종래의 수법에서는 보호관의 길이가 크게되고, 또 용탕의 유동에 의하여 보호관이 절손하지 않도록, 그의 두께를 충분히 크게하지 않으면 안된다.(2) In normal cases, the protective tube is inserted into the surface of the molten metal, and is floated by the supporting member. In this conventional technique, the thickness of the protective tube must be large enough so that the protective tube is large and the protective tube is not broken by the flow of molten metal.

그 때문에, 보호관이 극히 고가로 되는 결점이 있다.Therefore, there exists a fault that a protective tube becomes extremely expensive.

더욱이 보호관을 지지·고정하는 기구가 복잡하며, 그 취급이 번잡하다.Moreover, the mechanism for supporting and fixing the sheath is complicated and its handling is complicated.

[발명의 개시][Initiation of invention]

본 발명의 제1목적은, 금속, 유리 등의 용융체에 대한 내용손성이 우수하며, 상압소결품이라도 극히 높은 강도를 가지는 새로운 BN계 세라믹스를 제공하는 것이다.A first object of the present invention is to provide a new BN-based ceramics which is excellent in solvent resistance to melts such as metals and glass and has an extremely high strength even in atmospheric sintered products.

본 발명의 제2목적은 열전대에 의한 용탕의 연속측온이 가능한 보호캡을 사용하여 용기벽에 측온기능을 일체적으로 조립함으로써, 종래와 같이 탕면에서 용탕중에 보호관을 차입하여 지지하는 기구를 불요하게 한 용탕용기를 제공하는 것이다.The second object of the present invention is to integrally assemble the temperature measuring function on the wall of the container by using a protective cap capable of continuous temperature measurement of the molten metal by a thermocouple, thereby eliminating the need for a mechanism for borrowing and supporting a protective tube in the molten metal from the hot water surface as in the prior art. It is to provide a molten container.

상기 제1목적은 50중량% 이상의 BN 및 1중량% 이상 50중량% 미만의 AIN을 함유하는 BN계 세라믹스를 제공함으로써 달성된다.The first object is achieved by providing a BN-based ceramic containing at least 50% by weight of BN and at least 1% by weight and less than 50% by weight of AIN.

본 발명자 등의 시험결과에 의하면 50중량% 이상의 BN을 함유하는 세라믹스에 1

Figure kpo00001
AIN50중량%의 범위에서 AIN을 함유시키면 금속, 유리 등의 용융체에 대한 이 세라믹스의 내용손성이 현저하게 향상한다.According to the test results of the present inventors, 1 to ceramics containing 50% by weight or more of BN
Figure kpo00001
When AIN is contained in the range of 50 weight% of AIN, the damage resistance of this ceramics with respect to melts, such as a metal and glass, improves remarkably.

이 BN계 세라믹스에 AIN에 대한 중량비율 1.0 내지 10.0% 범위에서 Y2O3를 첨가하면, 이 세라믹스의 강도가 현저하게 향상한다. 그리고, BN계 세라믹스에 함유되는 BN 성분의 출발원료분말중에 적어도 일부를 아몰퍼스 BN 분말 또는 소결과정에서 아몰퍼스 BN을 생성하는 재료의 분말로 할 때, 상기 강도향상효과가 현저하게 나타난다.When Y2O3 is added to this BN ceramics in a weight ratio of 1.0-10.0% with respect to AIN, the strength of this ceramics improves remarkably. When the at least part of the starting material powder of the BN component contained in the BN-based ceramics is made of amorphous BN powder or a powder of amorphous BN in the sintering process, the above-mentioned strength improvement effect is remarkable.

상기 제2목적은 50중량% 이상의 BN과 1중량% 이상 50중량% 미만의 AIN을 함유하는 BN계 세라믹스로 형성된 보호캡을 사용하여 열전대를 통과시키는 관통구멍의 출구측 개구(용탕에 접하는 측의 개구)를 이 보호캡으로 봉지(封止)하여 이룬 내화물 블록을 용기벽에 교체가능하게 끼워넣어서 용탕용기를 제공함으로써 달성된다.The second purpose is an outlet opening of a through hole through which a thermocouple is passed using a protective cap formed of BN-based ceramics containing at least 50% by weight of BN and at least 1% by weight and less than 50% by weight of AIN. The refractory block formed by sealing the opening with this protective cap is inserted into the container wall so as to be replaceable to provide a molten container.

본 발명 세라믹중의 BN양은 50중량% 이상이다.The amount of BN in the ceramic of the present invention is 50% by weight or more.

이것은 BN 함유량을 50중량% 미만으로 하면 다른 세라믹스의 함유량이 50중량%를 초과하여 그 특성이 우세하며, BN의 특성이 희박하게 되어서 예컨대 열충격으로 깨어지기 쉽게 되는 등의 불편함이 생기기 때문이다.This is because when the BN content is less than 50% by weight, the content of other ceramics exceeds 50% by weight, and the characteristics are predominant, and the characteristics of BN become thin and, for example, the discomfort such as being easily broken by thermal shock occurs.

이 사실은 또한 AIN의 상한치를 50중량% 미만으로 할 것을 의미하고 있다.This fact also means that the upper limit of AIN should be less than 50% by weight.

AIN의 하한치를 1중량%로 하는 이유는, 1중량% 미만에서는 금속, 유리, 플럭스 등의 용융체에 대한 내용융성에 대하여 충분한 효과가 발휘되지 않기 때문이다. 또한 AIN의 원료분말로서는 AIN 분말 또는 소결과정에서 AIN으로 변화하는 Al 분말이 사용된다. BN계 세라믹스에 대한 Y2O3의 첨가량을 AIN에 대한 중량비율로서 1.0 내지 10.0%로 하는 이유는, 1.0% 미만에서는 강도향상효과가 적고, 10.0%를 초과하면 오히려 강도 저하를 초래하기 때문이다.The lower limit of AIN is 1% by weight because a sufficient effect is not exerted on solvent resistance to a melt such as metal, glass, and flux at less than 1% by weight. As the raw material powder of AIN, AIN powder or Al powder which is changed to AIN in the sintering process is used. The reason why the amount of Y2O3 added to the BN ceramics is 1.0 to 10.0% as the weight ratio to AIN is that the strength improvement effect is less than 1.0%, and the strength is lowered when it exceeds 10.0%.

본 발명 세라믹스에 포함되는 BN 성분의 출발 원료분말중의 적어도 일부 또는 전부를 아몰퍼스 BN 분말 또는 소결과정에서 아몰퍼스 BN로 변화하는 재료의 분말을 사용할 때, 상압소결로도 강도가 높은 세라믹스를 얻는다.When at least part or all of the starting raw material powder of the BN component contained in the ceramics of the present invention is used with amorphous BN powder or powder of a material which is changed to amorphous BN in the sintering process, high strength ceramics are obtained even by atmospheric sintering.

소결과정에서 아몰퍼스 BN로 변화하는 재료로서는 예컨대 붕소(B)를 들 수가 있다.Boron (B) is mentioned as a material which changes to amorphous BN in a sintering process, for example.

아몰퍼스 BN 또는 아몰퍼스 BN를 생성하는 분말은 전 BN 출발원료중의 적어도 20중량% 이상으로 하는 것이 바람직하다.The powder producing amorphous BN or amorphous BN is preferably at least 20% by weight or more in all the BN starting materials.

또한, 본 발명 세라믹스는 BN 및 AIN을 필수성분으로 하는 것이나, 그것 등의 규정 함유량이 손상되지 않는 범위에서 다른 산화물, 질화물, 탄화물, 규화물, 붕화물 등도 적절히 첨가할 수가 있다.In addition, the ceramics of the present invention contain BN and AIN as essential components, and other oxides, nitrides, carbides, silicides, borides, and the like can be appropriately added within a range in which the prescribed content thereof is not impaired.

[실시예 1]Example 1

① AIN함유량이 다른 소정형상의 BN 세라믹스 시료 No.1~No.5(표1)를 온도 1800℃에서 상압소결하였다.(1) BN ceramic samples Nos. 1 to 5 (Table 1) of predetermined shapes having different AIN contents were sintered at atmospheric pressure at a temperature of 1800 ° C.

또한 출발원료 BN의 K치는 0

Figure kpo00002
K
Figure kpo00003
0.9의 범위의 것이다.In addition, K value of starting material BN is 0
Figure kpo00002
K
Figure kpo00003
It is in the range of 0.9.

K치란 X선 회절패턴의 6방정 BN에 상당한 [hkl]의 피이크 면적을 S[hkl]로 하면,If K value is the peak area of [hkl] corresponding to the 6th BN of the X-ray diffraction pattern, S [hkl],

K=

Figure kpo00004
이다.K =
Figure kpo00004
to be.

(PHLIPS 사제 PW-1710, Cu-ka의선)(PW-1710 made by PHLIPS, Cu-ka line)

Figure kpo00005
Figure kpo00005

② 시료 No.1~No.5를 그의 상부가 용탕표면상에 돌출하도록 하여 온도 1600℃±20℃의 스테인레스강 용탕(JIS SUS 304재) 중에 차입하여, 메니스커스 부분의 용손량을 측정하였다. 그 결과를 제1조에 도시한다.(2) Sample Nos. 1 to 5 were inserted in a stainless steel molten metal (JIS SUS 304 material) having a temperature of 1600 ° C ± 20 ° C so that the upper part thereof protruded on the molten surface, and the melt loss amount of the meniscus was measured. . The results are shown in Article 1.

③ 제1도에 에 의하면, AIN 함유량이 1중량% 이상이 되면 시료의 용손량이 격감하는 것이 판명된다.(3) According to FIG. 1, it turns out that when the AIN content becomes 1 weight% or more, the amount of melt | dissolution amount of a sample will fall.

[실시예 2]Example 2

① Y2O3함유량이 다른 소정형상의 BN 세라믹스 시료 No.6~No.10(표 2)을 온도 1800℃에서 상압소결하여 얻었다.(1) BN ceramic samples No. 6 to No. 10 (Table 2) of predetermined shapes having different Y 2 O 3 contents were obtained by atmospheric pressure sintering at a temperature of 1800 ° C.

또한 출발원료 K치는 O

Figure kpo00006
K
Figure kpo00007
0.6의 범위의 것이다.Also, starting material K is O
Figure kpo00006
K
Figure kpo00007
It is in the range of 0.6.

K치란 X선 회결패턴의 6방정 BN에 상당한 [hkl]의 피이크 면적을 S[hkl]로 하면,If K value is the peak area of [hkl] corresponding to 6-square BN of the X-ray diffraction pattern, S [hkl],

K=

Figure kpo00008
이다.K =
Figure kpo00008
to be.

(PHILIPS사제 PW-1710, Cu-ka의 선)(Line of PW-1710 made in PHILIPS company, Cu-ka)

Figure kpo00009
Figure kpo00009

② 시료 No.6~No.10의 벤딩강도를 조사하였다.② Bending strength of samples No. 6 to No. 10 was examined.

그 결과를 표3에 표시한다.The results are shown in Table 3.

Figure kpo00010
Figure kpo00010

③ 표 3에 표시된 시험겨로가에서 AIN에 대한 Y2O3의 중량비율 1.0 내지 10.0%의 범위에서 BN 세라믹스의 벤딩강도가 크게 향상하는 것을 알 수 있다.③ It can be seen that the bending strength of BN ceramics is greatly improved in the test range shown in Table 3 in the range of 1.0 to 10.0% of the weight ratio of Y 2 O 3 to AIN.

[실시예 3]Example 3

본 발명조성의 BN계 세라믹스로 형성한 용탕온도측정용 열전대의 보호캡을 사용한 용달용기의 일부를 제2도에 도시한다.A part of the melting container using the protective cap of the thermocouple for molten metal temperature measurement formed from the BN ceramics of this invention composition is shown in FIG.

1은 금속용탕용기의 하부에 가까운 백의 일부를 표시하고 있다.1 shows a part of the bag near the lower part of the molten metal container.

벽(1)에 끼워놓은 내화물 블록(2)은 절두 원추형상체로서 중심부에 관통구멍(3)을 가지고 있으며, 예를들면 지르콘계 내화물(ZrO2·SiO2등)도 형성된다.The refractory block 2 sandwiched in the wall 1 is a truncated cone and has a through hole 3 in the center thereof, for example, a zircon-based refractory (ZrO 2 · SiO 2, etc.) is also formed.

그 대경측의 단면이 용기내를 향하도록 장착된 내화물 블록(2)은 용기내에 용탕의 주입될 때 용탕압을 받아서 벽(1)에 눌러부착되어 벽(1)에 끼워맞춤관계가 보다 긴밀하게 된다.The refractory block 2 mounted with its large diameter side facing the inside of the container receives the melt pressure when the molten metal is injected into the container, and is pressed against the wall 1 so that the fitting relationship on the wall 1 is more closely related. do.

내화물 블록(2)의 관통구멍(3)에는 열전대(5)를 수납하는 알루미나 보호관(4)이 관통삽입되고, 관통구멍(3)의 출구측 개구(용탕에 접하는 측의 개구)를 막고 보호관(4)의 선단부를 덮는 보호캡(6)이 장착되어 있다. 이 보호캡(6)은 예컨대 BN 70중량비, AIN 30중량비, Y2O30.9중량비(AIN에 대한 중량비율 3%)로 된 BN계 세라믹스로 형성된다. 또 내화물 블록(2)에 대한 보호캡(6)의 끼워맞춤부에 간극이 생기는 것이라면 밀봉재로서 캐스터블 내화물을 사용할 수가 있다 보호관(4)과 보호캡(6)은 특히 선단부에 있어서 밀접하여 열전대(5)의 선단부가 보호관(4)의 내면에 접촉되어 있으며, 용기내에 장입된 용탕의 열이 보호캡(6) 및 보호관(4)을 통하여 열전대(5)에 전달된다.The alumina protective tube 4 which accommodates the thermocouple 5 is inserted through the through hole 3 of the refractory block 2, and the opening of the through hole 3 (the opening on the side in contact with the molten metal) is blocked and the protective tube ( A protective cap 6 covering the tip of 4) is mounted. This protective cap 6 is formed of BN-based ceramics, for example, with a weight ratio of 70 wt% BN, 30 wt% AIN, and 0.9 wt% Y 2 O 3 (3% weight ratio to AIN). If the gap is formed in the fitting portion of the protective cap 6 with respect to the refractory block 2, the castable refractory can be used as a sealing material. The protective tube 4 and the protective cap 6 are particularly close to the tip portion of the thermocouple. The tip of 5) is in contact with the inner surface of the protective tube 4, the heat of the molten metal charged in the container is transmitted to the thermocouple 5 through the protective cap 6 and the protective tube (4).

상기 BN계 세라믹스로 형성된 보호캡(6)은 용강에 대하여도 약 12시간의 연속 측온에 견딜 수가 있다.The protective cap 6 formed of the BN-based ceramics can withstand molten steel for about 12 hours of continuous temperature measurement.

제2도에 표시된 바와 같이 벽(1)에 대한 열전대(5)의 조입구조에서는 종래의 장척의 보호관에 대신하여 사용되는 보호캡(6)이 충분한 단척이므로 경제적으로 유리하다. 또 보호캡(6)을 유지하기 위한 복잡한 기구(종래사용되고 있었던 기구)를 필요로 하지 않고, 측온을 위해 요구되는 작업이 극히 간단하므로, 작업공정수의 삭감에 의한 경비의 절감을 기대할수 있다.As shown in FIG. 2, in the fitting structure of the thermocouple 5 to the wall 1, it is economically advantageous because the protective cap 6 used in place of the conventional long protective tube is short enough. Moreover, since the work required for temperature measurement is extremely simple without the complicated mechanism (mechanism which was used previously) for holding the protective cap 6, the cost reduction by the reduction of the number of work processes can be expected.

연속사용에 의하여 보호캡(6)이 소모되어, 사용에 견딜수 없게 되면 용기가 빈 상태에서 내화물 블록(2)을 벽(1)에 빼어버리고 새로운 것과 교환하면 좋고, 그 복구 작업을 단시간에서 행하는 것이 가능하다.If the protective cap 6 is consumed by continuous use and cannot withstand the use of the container, the refractory block 2 can be removed from the wall 1 in an empty state and replaced with a new one. It is possible.

또한 예를들면 레이들, 턴디쉬 등의 용해기능을 가지지 않는 용탕용기외에, 용해기능을 가지는 용기에 대하여도 같은 연속 측온을 위한 벽구조를 채용할 수가 있다.In addition, for example, a wall structure for continuous temperature measurement can be adopted for a container having a dissolving function, in addition to a molten container not having a dissolving function such as ladle and tundish.

[실시예 4]Example 4

제3도는 실시예 3에서 표시한 구조에 가하여 위어(weir)(7)를 사용한 상태를 표시하고 있다. 위어(7)는 원통상체로서 벽(1)에 고정되어, 보호캡(6)을 포위하고 있다. 용기내에 용탕을 주입할 때 낙하하는 용탕이 직접 보호캡(6)에 충돌하면 이 보호캡(6)이 절손할 염려가 있으며 위어(7)는 주입되는 용탕의 충돌에서 보호캡(6)을 보호하기 위해 사용된다. 또 위어(7)는 용탕의 유동에서 보호캡(6)을 보호하여, 이 보호캡(6)의 내용손성을 향상시킨다는 작용효과를 나타낼 수 있다. 또한 위어(7)의 형상은 반드시 원통형이 아니라도 좋고, 주입되는 용탕의 충격, 또는 유동하는 용탕에서 보호캡(6)을 보호할 수 있는 형상이라도 좋다.3 shows a state in which the weir 7 is used in addition to the structure shown in the third embodiment. The weir 7 is fixed to the wall 1 as a cylindrical body, and surrounds the protective cap 6. When the molten metal falling into the container impinges directly on the protective cap 6, the protective cap 6 may be damaged, and the weir 7 protects the protective cap 6 from the collision of the injected molten metal. Used to In addition, the weir (7) can protect the protective cap (6) in the flow of the molten metal, it can exhibit the effect of improving the damage resistance of the protective cap (6). In addition, the shape of the weir 7 may not necessarily be cylindrical, and may be a shape which can protect the protective cap 6 from the impact of the molten metal injected, or the molten metal which flows.

[실시예 5]Example 5

제4도는 실시예 4에서 표시한 구조에 가하여, 보호캡(6)의 보호수단을 채용한 예를 표시하고 있다. 보호캡(6)의 외표면은 유리피복(8)을 덮혀져 있다. 용기내에 용탕을 주입하여, 보호캡(6)이 용탕중에 잠길 때 까지의 사이에, 이 보호캡(6)은 용탕의 복사열에 노출된다. 그 까닭에 용탕온도가 높은 경우에 알몸의 보호캡(6)이 산화되는 경향이 있는 바, 보호캡(6)의 이 표면은 유리피복(8)에 의하여 보호되어 있기 때문에 산화반응이 저지되어, 내구성이 향상된다. 이 유리피복(8)은 측온상의 지장이 되는 일은 없다.4 shows an example in which the protective means of the protective cap 6 is employed in addition to the structure shown in the fourth embodiment. The outer surface of the protective cap 6 is covered with a glass coating 8. The molten metal is injected into the container, and the protective cap 6 is exposed to radiant heat of the molten metal until the protective cap 6 is submerged in the molten metal. Therefore, when the molten metal temperature is high, the naked protective cap 6 tends to be oxidized, and since this surface of the protective cap 6 is protected by the glass coating 8, the oxidation reaction is inhibited, Durability is improved. This glass coating 8 does not interfere with a temperature measurement.

또한 상기 각 실시예에 있어서는 보호관(4)을 생락하는 것도 가능하다.In each of the above embodiments, the protective tube 4 can be omitted.

[산업상의 이용가능성]Industrial availability

본 발명의 BN계 세라믹스는 내용손성이 양호하며, 상압소결체로서도 강도가 높고, 그리고 제조경비가 저렴하므로, 금속, 유리 등의 용접하는 내구성 양호한 각종 노용부재로서 이용가능하다.The BN-based ceramics of the present invention have good resistance to damage, high strength as an atmospheric pressure sintered body, and low manufacturing cost, and thus can be used as various durable labor-use members for welding metals and glass.

Claims (4)

용탕 용기에 있어서, 한 개 이상의 벽 및 하부로 이루어지고, 상기 용탕을 받아서 유지하고, 한 개 이상의 벽에 한개 이상의 구멍을 갖는 용기 본체; 구멍을막는 상태로 상기 벽내의 상기 구멍에 교체 가능하게 끼워넣어진 내화물 블록; 상기 내화물 블록을 관통하는 관통구멍; 상기 용탕에 접하는 상기 내화물 블록측에서 상기 용탕과 접촉하지 않게 상기 관통구멍을 덮어 막고, 상기 용탕측 단부에서 막혀 있고, 상기 관통구멍과 연통하는 빈 내부가 있는 단부 보호 캡, 및 상기 관통구멍 및 상기 보호 캡의 부분에 수납된 열전대로 이루어지며, 상기 보호 캡은 50중량% 이상의 BN, 1중량% 이상의 50%미만의 AIN, 및 AIN에 대한 중량비율이 세라믹의 벤딩 강도를 5kg/mm2이상으로 증가시키는데 충분한 1.0 내지 10.0%인 Y2O3로 필수적으로 구성된, 높은 벤딩 강도를 갖는 세라믹 재료로 구성되며; 상기 보호 캡은 아몰퍼스 BN 및 B중의 한가지 이상을 20중량% 이상 함유하는 출발 원료를 상입소결하여 제조되는 것을 특징으로 하는 용탕용기.A molten metal container, comprising: a container body having one or more walls and a lower portion, receiving and retaining the molten metal, and having one or more holes in one or more walls; A refractory block replaceably inserted in said hole in said wall with said hole closed; A through hole penetrating the refractory block; An end protective cap having a hollow interior communicating with the through hole and covering the through hole so as not to contact the molten metal on the refractory block side in contact with the molten metal, and blocked at the melt side end portion, and the through hole and the The protective cap is made of a thermocouple housed in a portion of the protective cap, the protective cap is 50% by weight or more of BN, 1% or more by weight of less than 50% AIN, and the weight ratio to AIN increases the bending strength of the ceramic to more than 5kg / mm2 Consists of a ceramic material having a high bending strength, consisting essentially of Y 2 O 3 , which is sufficient to be 1.0 to 10.0%; The protective cap is a molten container, characterized in that the molten container is prepared by incorporating the starting material containing at least 20% by weight of at least one of amorphous BN and B. 제1항에 있어서, 상기 관통구멍 및 보호 캡의 빈 부분에 관통삽입되는 알루미나 보호관을 더 포함하는, 상기 열전대는 이 알루미나 보호관내에 수납되는 것을 특징으로 하는 용탕용기.The molten container according to claim 1, further comprising an alumina protective tube penetrating and inserted into an empty portion of the through hole and the protective cap. 제1항에 있어서, 상기 용탕측의 상기 단부 보호 캡의 표면을 덮어 보호하는 유리 피복을 더 포함하는 것을 특징으로 하는 용탕용기.The molten metal container of Claim 1 which further contains the glass coating which covers and protects the surface of the said end protection cap by the said molten metal side. 제1항에 있어서, 충격에서 상기 단부 보호 캡을 보호하는 형상으로 상기 용기본체의 벽에 고정되어 단부 보호 캡을 포위하는 원통상체의 위어를 더 포함하는 것을 특징으로 하는 용탕용기.The molten container of claim 1, further comprising a weir of a cylindrical body fixed to a wall of the container body in a shape to protect the end protection cap from impact and surrounding the end protection cap.
KR1019890700006A 1987-05-12 1988-05-12 Boron nitride ceramics and molten metal container composed of members made of the said ceramics KR970001264B1 (en)

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JP62-116627 1987-05-12
JP11662762 1987-05-12
JP11367662 1987-07-23
JP62-113676 1987-07-23
JP62325007A JPH01167592A (en) 1987-12-21 1987-12-21 Molten metal pot permitting continuous temperature measurement
JP62-325007 1987-12-21
PCT/JP1988/000453 WO1988008831A1 (en) 1987-05-12 1988-05-12 Boron nitride ceramics and molten metal container composed of members made of said ceramics

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