KR101112219B1 - Method for manufacturing ceramic tube of probe for gauging water level of high pressure - Google Patents

Method for manufacturing ceramic tube of probe for gauging water level of high pressure Download PDF

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KR101112219B1
KR101112219B1 KR1020110116592A KR20110116592A KR101112219B1 KR 101112219 B1 KR101112219 B1 KR 101112219B1 KR 1020110116592 A KR1020110116592 A KR 1020110116592A KR 20110116592 A KR20110116592 A KR 20110116592A KR 101112219 B1 KR101112219 B1 KR 101112219B1
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ceramic tube
ultra
sintered
high pressure
probe
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KR1020110116592A
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Korean (ko)
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김승용
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인베스트세라믹(주)
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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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B28WORKING CEMENT, CLAY, OR STONE
    • B28BSHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B1/00Producing shaped prefabricated articles from the material
    • B28B1/26Producing shaped prefabricated articles from the material by slip-casting, i.e. by casting a suspension or dispersion of the material in a liquid-absorbent or porous mould, the liquid being allowed to soak into or pass through the walls of the mould; Moulds therefor ; specially for manufacturing articles starting from a ceramic slip; Moulds therefor
    • B28B1/265Producing shaped prefabricated articles from the material by slip-casting, i.e. by casting a suspension or dispersion of the material in a liquid-absorbent or porous mould, the liquid being allowed to soak into or pass through the walls of the mould; Moulds therefor ; specially for manufacturing articles starting from a ceramic slip; Moulds therefor pressure being applied on the slip in the filled mould or on the moulded article in the mould, e.g. pneumatically, by compressing slip in a closed mould
    • 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
    • C04B35/622Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/64Burning or sintering processes
    • 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
    • C04B2235/00Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/70Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/74Physical characteristics
    • C04B2235/77Density

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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)
  • Dispersion Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)

Abstract

PURPOSE: A method for manufacturing the ceramic tube of a probe for gauging water level under ultrahigh pressures is provided to stabilize the abrasion resistance of the ceramic tube and to improve the durability of the ceramic tube by shaping the ceramic tube based on aluminum oxide of ultrahigh purity. CONSTITUTION: A method for manufacturing the ceramic tube(50) of a probe for gauging water lever under ultrahigh pressures includes the following: aluminum oxide of ultrahigh purity is prepared into the constant particle size; materials of 0.5 % or less of moisture content is classified from the aluminum oxide; the classified material is filled into a mold to obtain a tube-shaped product by pressurizing under 1,200 to 1,400 kg/cm^2. The shaped product is cut into the constant length to shape the outer diameter of the shaped product. The shaped product is primarily sintered under an oxidizing atmosphere at a temperature between 1,670 and 1,680 degrees Celsius for 4 to 6 hours. Products of pre-set sintered density or more are classified from the sintered product. The outer diameters of the classified products are finally processed. The finally processed products are secondarily sintered in a sintering furnace at a temperature between 1100 and 1200 degrees Celsius for 10 to 12 hours.

Description

초고압 수위 계측용 프로브의 세라믹 튜브 제조방법{Method for manufacturing ceramic tube of probe for gauging water level of high pressure}Method for manufacturing ceramic tube of probe for gauging water level of high pressure}

본 발명은 초고압 수위 계측용 프로브의 세라믹 튜브 제조방법에 관한 것으로서, 보다 상세하게는 초고압 수위 계측용 프로브에서 절연재로서 구비되는 세라믹 튜브를 초고순도의 세라믹으로 제작하여 초고밀도의 정확하고 충분한 내구력을 갖는 초고압 수위 계측용 프로브의 세라믹 튜브 제조방법에 관한 것이다.The present invention relates to a method of manufacturing a ceramic tube of an ultra-high pressure level measurement probe, and more particularly, to produce a ceramic tube provided as an insulating material in an ultra-high pressure level measurement probe made of ultra-high purity ceramic, which has an accurate and sufficient durability of ultra high density. The present invention relates to a method for manufacturing a ceramic tube of an ultra-high pressure level measurement probe.

일반적으로 무연탄을 연료로 사용하는 화력발전소에서는 고온고압의 증기를 발생시키도록 하는 초고압 용기가 구비되는 보일러가 설치되고, 이 보일러에는 초고압 용기 내의 수위를 측정하기 위한 계측 장비가 다양하게 구비되도록 하고 있다.In general, a thermal power plant using anthracite coal as a fuel is provided with a boiler having an ultra high pressure vessel for generating high temperature and high pressure steam, and the boiler is provided with various measuring equipment for measuring the water level in the ultra high pressure vessel. .

이런 계측 장비는 통상 신호전송이 불가능한 전통적인 유리형 현장 직독식(sight glass type)과 차압식 수위 전송식(D/P transmitter type) 및 현장 직독식 신호전송이 모두 가능한 세라믹 전극을 이용한 수위지시 및 전송식(remote drum level indicator type)으로 적용되고 있다.These instrumentation is used for level indication and transmission using ceramic electrodes, which can be used for both traditional glass type, D / P transmitter type and field direct type signal transmission, which are not normally transmitted. It is applied as a remote drum level indicator type.

이중 유리형 현장 직독식은 오작동의 염려는 없으나 사람이 직접 육안으로 현장 확인을 해야하는 번거로움과 함께 인력 낭비가 초래되는 방식이고, 차압식 수위 전송식은 설치와 전송이 용이하기는 하나 오동작을 알 수가 없는 문제가 있는데 반해 세라믹 전극을 이용한 수위지시 및 전송식은 직독 및 전송 신호의 출력이 모두 가능하므로 현재는 대부분의 발전소에서 수위지시 및 전송식의 계측 장비를 채택하여 사용하도록 하고 있다.The double-glass direct reading method does not have to worry about malfunctions, but it is a method that causes a waste of manpower as well as the inconvenience of having to check the site with the naked eye, and the differential pressure level transmission type is easy to install and transmit, but does not know malfunction On the other hand, the water level indication and transmission type using ceramic electrodes can output both direct reading and transmission signals. Currently, most power plants adopt the level indication and transmission measurement equipment.

이와 같은 수위 계측기(water level gauge)는 일정 압력 이상의 용기에는 반드시 적용하도록 법적으로 강제하고 있으며, 이렇게 압력 용기 내 수위지시 및 전송을 담당하는 핵심 부품을 프로브 어셈블리라고 한다.These water level gauges are legally mandated to be applied to vessels above a certain pressure. The core components responsible for level indication and transmission in pressure vessels are called probe assemblies.

이때 프로브 어셈블리에는 전극간을 분리되게 하면서 이들 사이에서 절연저항을 담당하도록 하는 링형상의 세라믹 튜브가 선단측에 구비되게 하므로서 용기 내에서 수위가 하부전극이나 세라믹 튜브 또는 상부전극에 위치되는 상태에 따라서 전기적 출력신호가 변화되도록 하므로서 수위를 계측하게 된다.In this case, the probe assembly is provided at the distal end with a ring-shaped ceramic tube that separates the electrodes and is responsible for insulation resistance therebetween, depending on the state of the water level in the lower electrode, the ceramic tube, or the upper electrode. The water level is measured by causing the electrical output signal to change.

하지만 종전의 세라믹 튜브는 고온고압(300bar,600℃)의 물속에서 산소분자가 불안정에 의해 산소의 비정상적인 활성화를 유발하게 되면서 부식을 촉진시켜 내구력 저하와 계측 불량을 초래하는 문제점이 있다.However, the conventional ceramic tube has a problem that the oxygen molecules in the water at high temperature and high pressure (300bar, 600 ℃) causes abnormal activation of oxygen due to instability and promotes corrosion to reduce durability and poor measurement.

상기한 문제점을 해결하기 위하여 본 발명은 순도가 높은 초고순도의 산화알루미늄을 사용하여 이론밀도에 근접하는 고밀도로서 성형되게 하므로서 불순물을 최소화시켜 부식 저항성을 안정화시키는 동시에 내구력이 매우 향상될 수 있도록 하는 초고압 수위 계측용 프로브의 세라믹 튜브 제조방법을 제공하는데 주된 목적이 있다.In order to solve the above problems, the present invention uses ultra-high-purity aluminum oxide with high purity to be molded at high density close to theoretical density, thereby minimizing impurities to stabilize corrosion resistance and at the same time, extremely high durability. It is a main object to provide a method for manufacturing a ceramic tube of a water level probe.

또한 본 발명은 절연성을 향상시켜 프로브 어셈블리를 통한 수위 계측의 정확성이 대폭적으로 향상되도록 하는 초고압 수위 계측용 프로브의 세라믹 튜브 제조방법을 제공하는데 다른 목적이 있다. It is another object of the present invention to provide a method for manufacturing a ceramic tube of an ultra-high pressure probe for measuring the water level, which greatly improves the accuracy of the water level measurement through the probe assembly.

상기의 목적 달성을 위한 본 발명의 초고압 수위 계측용 프로브의 세라믹 튜브 제조방법은, 순도가 99.7~99.9%의 초고순도의 산화알루미늄을 0.2~0.5㎛ 크기의 입자로 원료를 구비하는 단계와; 상기 원료의 수분함량을 체크하여 0.5% 이하의 원료만을 선별하는 단계와; 선별된 상기 원료를 내부에 코어를 삽입한 몰드 내부로 충진시켜 냉간정수압 프레스에 의해 1,200~1,400kg/㎠로 가압하여 튜브형상으로 성형물이 제작되도록 하는 단계와; 상기 성형물을 일정한 길이로 절단 및 외경 가공하는 단계와; 상기 튜브형 성형물을 1,670~1,680℃에서 4~6시간 홀딩시켜 산화분위기에서 소결시켜 소결밀도가 3.92g/㏄ 이상의 제품만을 선별하는 단계와; 원통연삭기와 다이아몬드 휠을 이용하여 외경을 마무리 가공하는 단계와; 가공된 성형물은 1,100~1,200℃에서 10~12시간 동안 소결로에서 소결처리하는 단계를 통해 수행되도록 한다.Ceramic tube manufacturing method of the ultra-high pressure level measurement probe of the present invention for achieving the above object comprises the steps of providing a raw material of ultra-high purity aluminum oxide having a purity of 99.7 ~ 99.9% as particles of 0.2 ~ 0.5㎛ size; Checking the moisture content of the raw material and selecting only the raw material of 0.5% or less; Filling the selected raw material into a mold having a core inserted therein to pressurize the tube to a pressure of 1,200 to 1,400 kg / cm 2 by a cold hydrostatic press to produce a molded product in a tube shape; Cutting and molding the molding to a constant length; Holding the tubular molded product at 1,670-1,680 ° C. for 4-6 hours and sintering in an oxidizing atmosphere to select only products having a sintered density of 3.92 g / ㏄ or more; Finishing the outer diameter using a cylindrical grinding machine and a diamond wheel; The processed molding is to be carried out through the step of sintering in the sintering furnace for 10 to 12 hours at 1,100 ~ 1,200 ℃.

상기한 본 발명에 따른 초고압 수위 계측용 프로브의 세라믹 튜브 제조방법에 의해 세라믹 원료를 초고순도로 구비하고, 이들 원료를 고온의 소결에 의해 기공이 제로에 가까운 동시에 이론밀도에 가까운 치밀한 밀도로 제품을 성형하므로서 미세한 불순물에 의한 오염 조차도 방지할 수 있는 보다 견고한 세라믹 튜브의 제조가 가능하다.According to the ceramic tube manufacturing method of the ultra-high-pressure water level measurement probe according to the present invention described above, ceramic raw materials are provided with ultra high purity, and the raw materials are manufactured at high density by close sintering at the same time, and close to theoretical density. Molding allows the manufacture of a more robust ceramic tube that can even prevent contamination by fine impurities.

또한 본 발명은 고온 고압에서도 계측용 프로브의 안정적인 사용과 수명을 대폭적으로 연장되게 하므로서 한층 경제적인 유지 관리가 가능하도록 한다.In addition, the present invention enables a more economical maintenance and management by significantly extending the stable use and life of the measuring probe even at high temperature and high pressure.

도 1은 초고압 용기에서 수위 계측을 위해 설치되는 계측용 프로브의 구성을 도시한 분해 사시도,
도 2는 본 발명에 따른 초고압 수위 계측용 프로브의 세라믹 튜브 제조방법의 공정을 순차적으로 도시한 공정순서도.
1 is an exploded perspective view showing the configuration of a measurement probe installed for measuring the water level in an ultrahigh pressure vessel;
Figure 2 is a process flow chart sequentially showing the process of the ceramic tube manufacturing method of the ultra-high pressure level measurement probe according to the present invention.

이하 본 발명에 따른 초고압 수위 계측용 프로브의 세라믹 튜브 제조방법의 바람직한 실시예를 보다 상세하게 설명하면 다음과 같다.Hereinafter, a preferred embodiment of the ceramic tube manufacturing method of the ultra-high pressure level measurement probe according to the present invention will be described in detail.

도 1은 초고압 용기에서 수위 계측을 위해 설치되는 계측용 프로브의 구성을 도시한 분해 사시도이다.1 is an exploded perspective view showing the configuration of a measurement probe installed for measuring the water level in an ultrahigh pressure vessel.

도시한 바와 같이 초고압 수위 계측용 프로브는 일정한 길이로 구비되는 센터 폴(10)의 외주면으로 하단부에는 전극 팁인 하부전극(20)이 센터 폴(10)의 하단에 나사 결합되고, 하부전극(20)으로부터 일정 높이 이격시킨 높이에는 상부전극(30)이 구비되며, 이때의 상부전극(30)은 그 상부에서 전극 바디(40)와 연결되도록 한다.As shown, the ultra-high pressure probe for measuring the water level is an outer circumferential surface of the center pole 10 having a predetermined length, and a lower electrode 20, which is an electrode tip, is screwed to the lower end of the center pole 10 at a lower end thereof, and the lower electrode 20 The upper electrode 30 is provided at a height spaced apart from the predetermined height, and the upper electrode 30 at this time is connected to the electrode body 40 at the upper portion thereof.

이와 같은 하부전극(20)과 상부전극(30)의 사이에서 전극 간을 절연시키기 위해 구비되는 것이 세라믹 튜브(50)로서, 이 세라믹 튜브(50)는 전극들과 마찬가지로 센터 폴(10)이 중심을 관통하도록 하면서 하부전극(20)과 상부전극(30)과는 브레이징에 의해 견고하게 결합되는 구성이다.The ceramic tube 50 is provided between the lower electrode 20 and the upper electrode 30 to insulate the electrodes from each other, and the ceramic tube 50 has a center pole 10 as the center thereof. While penetrating the lower electrode 20 and the upper electrode 30 is a configuration that is firmly coupled by brazing.

본 발명은 고온의 초고압 용기에서 수위를 계측하기 위해 설치되는 계측용 프로브의 하부전극(20)과 상부전극(30)간 절연을 위해 결합되는 세라믹 튜브(50)를 제조하는 방법이다.The present invention is a method of manufacturing a ceramic tube 50 coupled for insulation between the lower electrode 20 and the upper electrode 30 of the measurement probe installed to measure the water level in a high temperature ultra-high pressure vessel.

도 2는 본 발명에 따른 초고압 수위 계측용 프로브의 세라믹 튜브 제조방법의 공정을 순차적으로 도시한 공정순서도이다.Figure 2 is a process flow chart sequentially showing the process of the ceramic tube manufacturing method of the ultra-high pressure level measurement probe according to the present invention.

도시한 바와 같이 본 발명의 세라믹 튜브 제조를 위해서는 우선 원료로 사용되는 세라믹인 산화알루미늄(Al2O3)을 구비해야만 한다.As shown in the figure, in order to manufacture the ceramic tube of the present invention, aluminum oxide (Al 2 O 3 ), which is a ceramic used as a raw material, must first be provided.

이때의 산화알루미늄은 순도가 99.7~99.9%의 초고순도의 세라믹 원료를 사용하며, 산화알루미늄은 0.2~0.5㎛ 크기의 입자로서 구비하도록 한다.(제1 단계)At this time, the aluminum oxide is made of ultra-high purity ceramic raw material having a purity of 99.7 to 99.9%, and aluminum oxide is to be provided as particles having a size of 0.2 ~ 0.5㎛ (first step).

이와 같은 초고순도 세라믹 원료는 불순물이나 공기 중 이물질 침입이 방지되도록 하기 위하여 밀봉시켜 관리되게 하는 것이 가장 바람직하다.Such ultra-high purity ceramic raw materials are most preferably sealed and managed to prevent infiltration of impurities or foreign substances in the air.

관리가 이루어지더라도 초고순도 세라믹 원료들은 공기 중의 수분을 다소 흡수하고 있으므로 이들 세라믹 원료들을 체크하여 0.5% 이하의 수분량을 가진 세라믹 원료들만을 선별하도록 한다.(제2 단계)Even though management is carried out, ultra-high purity ceramic raw materials absorb some moisture in the air, so check these ceramic raw materials to select only ceramic raw materials with moisture content of 0.5% or less.

상기의 단계에서 선별된 세라믹 원료들은 내부에 코어를 삽입한 몰드의 내부로 충진되도록 하며, 코어와 몰드 사이에 채워진 세라믹 원료들은 냉간정수압 프레스(Cold Isostatic Press, 약칭 CIP라고 함)에 의해서 1,200~1,400kg/㎠로 가압되도록 한다.The ceramic raw materials selected in the above step are filled into the inside of the mold with the core inserted therein, and the ceramic raw materials filled between the core and the mold are cold pressed by cold Isostatic Press (CIP). Pressurized to kg / cm 2.

프레스에 의해 성형되는 성형물은 몰드를 제거 시 튜브형상을 갖게 되며(제3 단계), 이런 튜브형상의 성형물은 일정한 길이로 절단 및 외경을 가공하도록 하여 복수 개로서 제작되도록 한다.(제 4단계)The moldings formed by the press have a tube shape when the mold is removed (step 3), and the tube-shaped moldings are cut and processed to a certain length so as to be manufactured as a plurality (step 4).

특히 성형물의 내경을 형성하는 코어는 제작 시 세라믹 원료들의 프레싱에 의해서 성형물을 성형 시 수축률을 감안하여 길이와 외경을 제작하도록 하는 것이 가장 바람직하다.In particular, the core for forming the inner diameter of the molding is most preferably made to manufacture the length and the outer diameter in consideration of the shrinkage rate when molding the molding by pressing the ceramic raw materials during manufacturing.

일정 압력의 가압에 의해 튜브형상으로 성형되는 성형물은 1,670~1,680℃에서 4~6시간을 홀딩시켜 산화분위기에서 1차 소결되도록 한다.(제5 단계)The molded article formed into a tube shape by pressurization of a constant pressure is held at 1,670 ~ 1,680 ° C for 4-6 hours to be first sintered in an oxidizing atmosphere.

소결된 성형물들 중 소결밀도가 3.92g/㏄ 이상의 제품만을 선별하도록 하며(제6 단계), 이렇게 선별된 성형물들을 원통연삭기와 다이아몬드 휠을 이용하여 외경을 마무리 가공한다.(제7 단계)Among the sintered moldings, only the products having a sintered density of 3.92 g / ㏄ or more are selected (stage 6), and the sorted moldings are finished by using a cylindrical grinding machine and a diamond wheel (stage 7).

외경을 가공한 성형물들은 다시 1,100~1,200℃에서 10~12시간 동안 소결로에서 2차 소결처리하므로서(제8 단계) 초고순도의 세라믹 튜브가 제작되도록 한다.The moldings with the outer diameter are again subjected to secondary sintering in a sintering furnace (step 8) at 1,100 to 1,200 ° C. for 10 to 12 hours to produce an ultra-high purity ceramic tube.

다만 외경의 마무리 가공 시 다이아몬드 휠은 800 메쉬 이상을 사용하며, 이때 휠 자국이나 기계적 스트레스가 없도록 하는 것이 가장 바람직하다.However, when finishing the outer diameter, the diamond wheel uses 800 mesh or more, and it is most desirable that there is no wheel mark or mechanical stress.

이와 같이 제작되는 세라믹 튜브는 계측용 프로브의 상부와 하부 전극 사이에서 은 브레이징에 의해 850~900℃의 진공 분위기에서 밀봉접합되도록 하여 결합시킨다.The ceramic tube manufactured as described above is bonded by sealing between the upper and lower electrodes of the measurement probe by silver brazing in a vacuum atmosphere of 850 to 900 ° C.

이상과 같이 성형 제작되는 세라믹 튜브는 초고순도를 유지하게 되므로서 부식 저항성이 향상되어 안정적으로 절연성을 유지할 수가 있게 된다.As described above, the ceramic tube formed and manufactured may maintain ultra high purity, thereby improving corrosion resistance and stably maintaining insulation.

또한 고온에서의 소결처리에 의해 제로에 가까운 기공을 갖는 동시에 이론밀도에 근접한 밀도를 갖게 되면서 대단히 견고한 내구성을 갖게 된다.In addition, the sintering process at high temperature has porosity close to zero and density close to theoretical density, and extremely durable.

따라서 계측용 프로브에 본 발명의 세라믹 튜브를 적용하게 되면 안정적으로 보다 장시간 사용이 가능하므로 정확한 수위 계측이 가능할 뿐만 아니라 계측용 프로브의 사용 수명을 연장하므로서 보다 경제적인 유지 관리가 가능하게 되는 이점을 제공한다.Therefore, when the ceramic tube of the present invention is applied to the measurement probe, it is possible to stably use it for a longer time, thereby providing accurate water level measurement and providing more economical maintenance by extending the service life of the measurement probe. do.

10 : 센터 폴
20 : 하부전극
30 : 상부전극
40 : 전극 바디
50 : 세라믹 튜브
10: center pole
20: lower electrode
30: upper electrode
40: electrode body
50: ceramic tube

Claims (4)

순도가 99.7~99.9%의 초고순도의 산화알루미늄을 일정한 크기의 입자로 원료를 구비하는 단계와;
상기 원료의 수분함량을 체크하여 0.5% 이하의 원료만을 선별하는 단계와;
선별된 상기 원료를 내부에 코어를 삽입한 몰드 내부로 충진시켜 1,200~1,400kg/㎠로 가압하여 튜브형상으로 성형물이 제작되도록 하는 단계와;
상기 성형물을 일정한 길이로 절단하여 복수 개로서 구비하면서 각 성형물의외경을 가공하는 단계와;
상기 튜브형 성형물들을 1,670~1,680℃에서 4~6시간 홀딩시켜 산화분위기에서 1차 소결시키는 단계와;
상기 소결한 성형물들 중 일정 이상의 소결밀도 제품만을 선별하는 단계와;
원통연삭기와 다이아몬드 휠을 이용하여 외경을 마무리 가공하는 단계와;
가공된 성형물은 1,100~1,200℃에서 10~12시간 동안 소결로에서 2차 소결처리하는 단계;
를 통해 수행되는 초고압 수위 계측용 프로브의 세라믹 튜브 제조방법.
Preparing a raw material of ultra-high purity aluminum oxide having a purity of 99.7 to 99.9% as particles of a predetermined size;
Checking the moisture content of the raw material and selecting only the raw material of 0.5% or less;
Filling the sorted raw material into a mold having a core inserted therein to pressurize 1,200 to 1,400 kg / cm 2 to produce a molded product in a tube shape;
Cutting the moldings to a predetermined length and processing the outer diameters of the moldings as a plurality;
Holding the tubular moldings at 1,670-1,680 ° C. for 4-6 hours to first sinter in an oxidizing atmosphere;
Selecting only sintered density products of at least one of the sintered moldings;
Finishing the outer diameter using a cylindrical grinding machine and a diamond wheel;
Processed moldings are subjected to secondary sintering in a sintering furnace at 1,100 to 1,200 ° C. for 10 to 12 hours;
Ceramic tube manufacturing method of the ultra-high pressure level measurement probe carried out through.
청구항 1에 있어서,
초고순도의 상기 산화알루미늄은 0.2~0.5㎛ 크기의 입자로 구비되도록 하는 초고압 수위 계측용 프로브의 세라믹 튜브 제조방법.
The method according to claim 1,
The ultra-high purity aluminum oxide is a ceramic tube manufacturing method of the ultra-high pressure level measurement probe to be provided with particles of 0.2 ~ 0.5㎛ size.
청구항 1에 있어서,
1차 소결한 상기 성형물들은 소결밀도가 3.92g/㏄ 이상의 제품만을 선별하도록 하는 초고압 수위 계측용 프로브의 세라믹 튜브 제조방법.
The method according to claim 1,
The primary sintered moldings are ceramic tube manufacturing method of the ultra-high pressure probe for measuring the sintered density of only 3.92g / ㏄ or more.
청구항 1에 있어서,
1차 소결한 상기 성형물의 외경 가공은 800Mesh 이상의 다이아몬드 휠을 사용하도록 하는 초고압 수위 계측용 프로브의 세라믹 튜브 제조방법.
The method according to claim 1,
The outer diameter processing of the molded product sintered first is a method for producing a ceramic tube of ultra-high pressure level measurement probe to use a diamond wheel of 800Mesh or more.
KR1020110116592A 2011-11-09 2011-11-09 Method for manufacturing ceramic tube of probe for gauging water level of high pressure KR101112219B1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001213664A (en) 2000-01-28 2001-08-07 Sumitomo Chem Co Ltd Sintered alumina and its manufacturing method and use
JP2001322866A (en) 1999-05-19 2001-11-20 Ngk Spark Plug Co Ltd Alumina sintered compact and method for manufacturing the same, sintered alumina member and light emitting tube
KR100737274B1 (en) 2005-11-09 2007-07-09 한연수 Manufacturing method of the sensor for liquid concentration and level measurement and sensor thereof
US20090111067A1 (en) 2007-10-30 2009-04-30 Tosoh Corporation High toughness translucent alumina sintered body, method for producing the same, and its uses

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001322866A (en) 1999-05-19 2001-11-20 Ngk Spark Plug Co Ltd Alumina sintered compact and method for manufacturing the same, sintered alumina member and light emitting tube
JP2001213664A (en) 2000-01-28 2001-08-07 Sumitomo Chem Co Ltd Sintered alumina and its manufacturing method and use
KR100737274B1 (en) 2005-11-09 2007-07-09 한연수 Manufacturing method of the sensor for liquid concentration and level measurement and sensor thereof
US20090111067A1 (en) 2007-10-30 2009-04-30 Tosoh Corporation High toughness translucent alumina sintered body, method for producing the same, and its uses

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