KR20030091175A - Ceramic heating element and method of the same - Google Patents

Ceramic heating element and method of the same Download PDF

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KR20030091175A
KR20030091175A KR1020020029030A KR20020029030A KR20030091175A KR 20030091175 A KR20030091175 A KR 20030091175A KR 1020020029030 A KR1020020029030 A KR 1020020029030A KR 20020029030 A KR20020029030 A KR 20020029030A KR 20030091175 A KR20030091175 A KR 20030091175A
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heating element
ceramic heating
binder
oxide
silicon carbide
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KR1020020029030A
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KR100470316B1 (en
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장경순
전두열
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신일산업 주식회사
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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
    • C04B35/56—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 carbides or oxycarbides
    • C04B35/565—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 carbides or oxycarbides based on silicon carbide
    • 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
    • C04B35/10—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 aluminium oxide
    • 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
    • C04B35/14—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 silica
    • 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
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00439—Physico-chemical properties of the materials not provided for elsewhere in C04B2111/00
    • 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
    • C04B2235/38—Non-oxide ceramic constituents or additives
    • C04B2235/3817—Carbides
    • C04B2235/3826—Silicon carbides
    • 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
    • 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
    • C04B35/64—Burning or sintering processes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C7/00—Stoves or ranges heated by electric energy
    • F24C7/02—Stoves or ranges heated by electric energy using microwaves
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves

Abstract

PURPOSE: Provided is a ceramic heater, which generates heat under high temperature in a short time by controlling the mixing ratio of the components. CONSTITUTION: The ceramic heater heated by microwaves comprises: 10-20 wt% of aluminum oxide, 20-30 wt% of silicon dioxide, 20-60 wt% of silicon carbide, 1-10 wt% of magnesium oxide, 1-10 wt% of a loess and 1-10 wt% of a binder. The ceramic heater is produced by the method comprising: the step(S100) for preparing and mixing the above components; the step(S200) for forming the mixture obtained from the preceding step into a desired shape and drying; the step(S300) for firing the formed ceramic heater; and the step(S400) for carrying out the finishing treatment of the ceramic heater.

Description

세라믹 발열체 및 그 제조방법{CERAMIC HEATING ELEMENT AND METHOD OF THE SAME}Ceramic heating element and its manufacturing method {CERAMIC HEATING ELEMENT AND METHOD OF THE SAME}

본 발명은 세라믹 발열체 및 그 제조방법에 관한 것으로, 더욱 상세하게는 산화 알루미늄(Al2O3), 산화규소(SiO2), 탄화규소(SiC), 산화 마그네슘(MgO) 등으로 구성되어 마이크로파가 전달되는 경우 고온의 열을 발생시킬 수 있는 세라믹 발열체 및 그 제조방법에 관한 것이다.The invention consists of a ceramic heating element, and that relates to a manufacturing method, and more particularly, aluminum oxide (Al 2 O 3), silicon oxide (SiO 2), silicon carbide (SiC), magnesium oxide (MgO), such as a microwave The present invention relates to a ceramic heating element capable of generating high temperature heat when delivered and a method of manufacturing the same.

일반적으로 세라믹(Ceramic)은 무기물질을 주원료로 사용하는 산화물 (Oxide), 질화물(Nitride), 탄화물(Carbide)등의 재료를 포함하는 물질이다. 이러한 세라믹은 금속재료, 유기재료에 비하여 내식성, 내열성, 내마모성 등이 우수한재료이다. 따라서, 세라믹은 그 용도에 따라 다양한 분야에서 널리 사용되고 있다.In general, ceramic is a material including materials such as oxide, nitride, carbide, etc., in which inorganic materials are used as the main raw materials. Such ceramics are excellent in corrosion resistance, heat resistance, abrasion resistance, and the like compared to metal materials and organic materials. Therefore, ceramics are widely used in various fields depending on their use.

특히, 전자렌지와 같은 조리기구에서도 이러한 세라믹 재질을 이용하여 발열율을 향상시켜 조리효과를 높이고자 하는 기술이 시도되고 있다.In particular, in a cooking utensil such as a microwave oven, a technique for improving a heating effect by using such a ceramic material has been attempted.

이러한 세라믹 재질을 이용한 발열체의 일예가 "전자렌지용 발열체 트레이" 라는 명칭으로 국내 출원되어 등록된 특허등록번호 제1996-12735호(특허권자:엘지전자주식회사)에 개시된다.An example of a heating element using such a ceramic material is disclosed in Patent Registration No. 1996-12735 (Patent Holder: LG Electronics Co., Ltd.), filed and registered in Korea under the name "heating tray for microwave oven".

상기한 전자렌지용 트레이는 전자렌지 마이크로파를 이용하여 가열, 조리하는 전자렌지의 발열체에 관한 것이다. 즉, 상기 발열체는 알루미늄 재질의 트레이를 구비하고, 이 트레이의 외부면에 중량%로서 페라이트(ferrite) 20~60%, 실리콘 수지 10~30%, 알루미늄분말 5~10%, 규사 또는 형석 2~10%, PTFE(Poly Tetra Flouro Ethylene) 3~10%, 카본블렉(Carbon Black) 1~10%이고, 나머지는 용제(Solvent)로 조정된 혼합물을 코팅함으로서 이루어진다.The microwave oven tray relates to a heating element of a microwave oven that is heated and cooked using a microwave microwave. That is, the heating element is provided with a tray made of aluminum, 20 to 60% ferrite, 10 to 30% silicone resin, 5 to 10% aluminum powder, silica sand or fluorite 2 to 30% by weight on the outer surface of the tray. 10%, Poly Tetra Flouro Ethylene (PTFE) 3-10%, Carbon Black 1-10%, and the rest is made by coating the mixture adjusted with Solvent.

상기한 성분으로 이루어진 발열체는 마그네트론으로부터 방사되는 마이크로파를 활성화시킴으로써 발열효율을 향상시켜 음식물을 조리하게 된다.The heating element composed of the above components improves the heating efficiency by activating the microwaves emitted from the magnetron to cook food.

그러나, 상기한 바와 같은 전자렌지용 트레이에 코팅된 혼합물은 단시간에 충분한 온도로 가열되기는 어려움으로 조리효율이 떨어지는 문제점이 있다.However, the mixture coated on the tray for a microwave oven as described above is difficult to be heated to a sufficient temperature in a short time there is a problem that the cooking efficiency is lowered.

따라서, 본 발명은 전술한 문제점을 해결하기 위하여 안출 된 것으로서, 본 발명의 목적은 산화 알루미늄(Al2O3), 산화규소(SiO2), 탄화규소(SiC), 산화 마그네슘(MgO) 등의 성분으로 구성되어 마이크로파에 의한 발열효율을 향상시킬 수 있는 세라믹 발열체 및 그 제조방법을 제공하는데 있다.Accordingly, the present invention has been made to solve the above problems, the object of the present invention is aluminum oxide (Al 2 O 3 ), silicon oxide (SiO 2 ), silicon carbide (SiC), magnesium oxide (MgO) and the like The present invention provides a ceramic heating element and a method of manufacturing the same, which are composed of components and which can improve the heating efficiency by microwaves.

도1 은 본 발명의 바람직한 실시예에 따른 세라믹 발열체의 제조공정을 도시하는 공정도.1 is a process chart showing a manufacturing process of a ceramic heating element according to a preferred embodiment of the present invention.

도2 는 본 발명의 바람직한 실시예에 따른 세라믹 발열체가 적용된 전자렌지용 조리기구를 도시하는 단면도.2 is a cross-sectional view illustrating a cooking appliance for a microwave oven to which a ceramic heating element is applied according to a preferred embodiment of the present invention.

상기 본 발명의 목적을 실현하기 위하여, 본 발명의 바람직한 실시예는 산화 알루미늄(Al2O3)10wt% ~ 20wt%와, 산화규소(SiO2)20wt% ~ 30wt%와, 탄화규소(SiC) 20wt% ~ 60wt%와, 산화마그네슘(MgO) 1wt% ~ 10wt%와, 점토 1wt% ~ 10wt%와, 바인더(Binder) 1wt% ~ 10wt%를 포함하는 세라믹 발열체를 제공한다.In order to realize the object of the present invention, a preferred embodiment of the present invention is aluminum oxide (Al 2 O 3 ) 10wt% ~ 20wt%, silicon oxide (SiO 2 ) 20wt% ~ 30wt%, silicon carbide (SiC) Provided is a ceramic heating element comprising 20 wt% to 60 wt%, magnesium oxide (MgO) 1 wt% to 10 wt%, clay 1 wt% to 10 wt%, and binder (wt%) to 10 wt%.

또한, 본 발명의 다른 목적을 실현하기 위하여, 본 발명의 바람직한 실시예는 산화 알루미늄(Al2O3), 산화규소(SiO2), 탄화규소(SiC), 산화 마그네슘(MgO), 점토, 바인더를 준비하고 혼합(Mixing)하는 제1 단계와; 상기 제1 단계에서 혼합된 원료를 일정한 형상으로 성형(Forming)하고 건조(Drying)하는 제2 단계와; 상기 제2 단계에서 성형된 세라믹 발열체를 소성(Firing)하는 제3 단계와; 그리고 세라믹 발열체를 마무리 가공(Finishing)하는 제4 단계를 포함하는 세라믹 발열체 제조방법을 제공한다.In addition, in order to realize other objects of the present invention, a preferred embodiment of the present invention is aluminum oxide (Al 2 O 3 ), silicon oxide (SiO 2 ), silicon carbide (SiC), magnesium oxide (MgO), clay, binder A first step of preparing and mixing (Mixing); A second step of forming and drying the raw materials mixed in the first step into a predetermined shape; A third step of firing the ceramic heating element molded in the second step; And it provides a ceramic heating element manufacturing method comprising a fourth step of finishing the ceramic heating element (Finishing).

이하, 첨부된 도면을 참조하여 본 발명의 바람직한 일 실시예에 따른 세라믹 발열체 및 그 제조방법을 상세하게 설명한다.Hereinafter, a ceramic heating element and a method of manufacturing the same according to an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings.

도1 에 도시된 바와 같이, 본 발명이 제안하는 세라믹 발열체의 제조방법은 원료(Raw Material)를 준비하고 혼합(Mixing)하는 제1 단계(S100)와, 상기 제1 단계(S100)에서 혼합된 원료를 일정한 형상으로 성형(Forming)하고 건조(Drying)하는제2 단계(S200)와, 상기 제2 단계(S200)에서 성형된 세라믹 발열체를 소성(Firing)하는 제3 단계(S300)와, 그리고 세라믹 발열체를 마무리 가공(Finishing)하는 제4 단계(S400)를 포함한다.As shown in FIG. 1, the method of manufacturing a ceramic heating element proposed by the present invention includes preparing a first raw material and mixing the raw material, and mixing the first heating material in the first step S100. A second step (S200) of forming and drying the raw material into a predetermined shape, a third step (S300) of firing the ceramic heating element molded in the second step (S200), and A fourth step (S400) for finishing the ceramic heating element (Finishing).

이와 같은 세라믹 발열체의 제조방법에 있어서, 상기 제1 단계(S100)에서는 세라믹 발열체를 구성하는 각 성분들을 일정 비율로 서로 혼합한다.In the method of manufacturing a ceramic heating element, in the first step S100, the components constituting the ceramic heating element are mixed with each other at a predetermined ratio.

즉, 산화 알루미늄(Al2O3), 산화규소(SiO2), 탄화규소(SiC), 산화 마그네슘 (MgO), 점토, 바인더를 서로 혼합한다.That is, aluminum oxide (Al 2 O 3 ), silicon oxide (SiO 2 ), silicon carbide (SiC), magnesium oxide (MgO), clay, and a binder are mixed with each other.

그리고, 이러한 세라믹 발열체의 각 구성 성분들은 서로 일정한 비율로 혼합된다. 즉, 산화 알루미늄(Al2O3)은10wt% ~ 20wt%, 산화규소(SiO2)는20wt% ~ 30wt%, 탄화규소(SiC)는 20wt% ~ 60wt%, 산화마그네슘(MgO)은 1wt% ~ 10wt%와, 점토는 1wt% ~ 10wt%, 바인더(Binder)는 1wt% ~ 10wt%로 이루어진다.Each component of the ceramic heating element is mixed with each other at a constant ratio. That is, 10 wt% to 20 wt% of aluminum oxide (Al 2 O 3 ), 20 wt% to 30 wt% of silicon oxide (SiO 2 ), 20 wt% to 60 wt% of silicon carbide (SiC), and 1 wt% of magnesium oxide (MgO) ~ 10wt%, clay 1wt% ~ 10wt%, binder (Binder) is made of 1wt% ~ 10wt%.

이와 같은 성분들로 이루어진 세라믹 발열체는 마이크로파(Microwave)가 전달되는 경우 고온의 열, 바람직하게는 약 200 ~ 300℃의 열을 단 시간에 발생시키게 된다.The ceramic heating element composed of such components generates high-temperature heat, preferably heat of about 200 to 300 ° C. in a short time when microwave is delivered.

상기한 각 구성 성분을 보다 상세하게 설명하면, 상기 산화 알루미늄(Al2O3) 및 SiO2(산화규소)의 경우 소성 공정에서 강도와 소성온도를 낮추기 위하여 사용된다.In more detail, each of the components described above, in the case of the aluminum oxide (Al 2 O 3 ) and SiO 2 (silicon oxide) is used to lower the strength and firing temperature in the firing process.

이러한 산화 알루미늄 및 산화규소는 그 함량이 적정함량 보다 많은 경우, 즉 10wt% ~ 20wt% 와 20wt% ~ 30wt% 이상 함유되는 경우에는 소성온도가 높아진다.따라서, 이러한 산화알루미늄 및 산화규소가 함유된 발열물질이 후술하는 전자렌지에 발열체로 적용되는 경우에는 과열로 인하여 조리물이 타게 된다.When the content of aluminum oxide and silicon oxide is higher than the appropriate content, that is, when 10 wt% to 20 wt% and 20 wt% to 30 wt% or more are contained, the firing temperature is increased. Thus, the exothermic heat containing aluminum oxide and silicon oxide is high. When the material is applied as a heating element to the microwave oven described later, the food is burned due to overheating.

반면에, 함량이 적은 경우에는 소성온도가 낮아짐으로 전자렌지에 발열체로 적용되는 경우에는 온도가 낮아 조리물이 조리되지 않는 문제점이 있다.On the other hand, when the content is small, the firing temperature is lowered, and when the microwave oven is applied as a heating element, there is a problem that the food is not cooked because the temperature is low.

그리고, 탄화규소(SiC)의 경우 마이크로파를 흡수하여 이를 열에너지로 전환시키는 작용을 하게 된다. 즉, 탄화규소의 함량에 따라 열에너지 전환효율이 변화하여 발열량이 변화함으로, 탄화규소의 함량을 적절하게 조절함으로써 목표하는 발열량을 얻을 수 있다.And, in the case of silicon carbide (SiC) absorbs microwaves and converts them into thermal energy. That is, since the heat energy conversion efficiency changes according to the content of silicon carbide and the calorific value changes, the target calorific value can be obtained by appropriately adjusting the content of silicon carbide.

또한, 이러한 탄화규소는 그 함량을 조절함으로써 소성공정에서 소성온도를 상승 혹은 저하시킬 수 있다. 즉, 탄화규소의 함량이 상승하는 경우 소성온도가 상승함으로써 성능이 상승하게 되며, 탄화규소의 함량이 저하되는 경우 소성온도가 내려감으로서 성능이 저하된다. 또한, 이러한 탄화규소의 함량은 제조원가와 밀접한 관계가 있다. 따라서, 세라믹 발열체의 제조시 성능과 제조원가를 고려하여 탄화규소의 함량을 적절하게 조절할 필요가 있다.In addition, the silicon carbide can increase or decrease the firing temperature in the firing step by adjusting the content thereof. In other words, when the content of silicon carbide increases, the performance is increased by increasing the firing temperature, and when the content of silicon carbide is lowered, the performance is reduced by lowering the firing temperature. In addition, the content of such silicon carbide is closely related to the manufacturing cost. Therefore, it is necessary to appropriately adjust the content of silicon carbide in consideration of the performance and manufacturing cost in the manufacture of the ceramic heating element.

그리고, 상기 탄화규소가 적정함량, 즉 20wt% ~ 60wt% 보다 많이 함유되는 경우에는 성형시 소성온도가 상승하게 됨으로 전자렌지의 발열체로 적용되는 경우에는 과열됨으로써 조리물이 타는 현상이 발생하게 된다.In addition, when the silicon carbide is contained in an appropriate amount, that is, 20wt% to 60wt%, the firing temperature is increased during molding, and when it is used as a heating element of a microwave oven, the food burns due to overheating.

반면에, 함량이 적은 경우에는 소성시 부푸는 현상이 발생하여, 전자렌지의 발열체로 사용하기에는 강도가 떨어질 수 있는 문제점이 있다.On the other hand, when the content is small, there is a problem that a swelling phenomenon occurs during firing, the strength may be reduced to use as a heating element of the microwave oven.

그리고, 산화마그네슘(MgO)과, 점토와, 바인더는 성형공정 및 소성공정에서소성온도 및 성형을 원활하게 하기 위하여 첨가된다.And magnesium oxide (MgO), clay, and a binder are added in order to facilitate baking temperature and shaping | molding in a shaping | molding process and a baking process.

상기한 성분중 점토는 상기한 발열물질이 성형 등에 의하여 일정한 형상을 갖도록 제조되는 경우, 각 성분들을 서로 접착시킴으로써 성형물의 형태를 유지시키는 역할을 한다. 따라서, 점토의 함량은 실험결과 1wt% ~ 10wt%가 적절하며, 이 기준치보다 함량이 많게 되면, 발열체에 적용되는 경우 갈라짐 현상이 발생할 수 있다. 또한, 함량이 적은 경우에는 발열체가 깨지는 현상이 발생할 수 있다.Clay of the above components serves to maintain the shape of the molding by adhering each component when the heating material is manufactured to have a certain shape by molding or the like. Therefore, the content of clay is 1wt% ~ 10wt% is appropriate as a result of the experiment, if the content is higher than the reference value, the cracking phenomenon may occur when applied to the heating element. In addition, when the content is small, the phenomenon that the heating element is broken may occur.

그리고, 바인더(Binder)는 상기한 성형물이 금형에서 원활하게 취출되도록 한다. 따라서, 상기 바인더는 그 함량이 1wt% ~ 10wt% 범위인 경우 성형에 있어서의 취출성이 가장 우수하다.And, the binder (Binder) to allow the above molded article to be taken out from the mold smoothly. Therefore, the binder has the best extraction property in molding when the content is in the range of 1wt% to 10wt%.

바인더의 함량이 상기 기준치보다 많은 경우에는 성형과정에서 성형체에 기공이 다수 발생됨으로 발열체의 조직이 균일하지 못하여 조리성능이 저하된다.When the content of the binder is greater than the reference value, a large number of pores are generated in the molded body during the molding process, so that the structure of the heating element is not uniform and the cooking performance is reduced.

반면에, 바인더의 함량이 상기 기준치보다 적은 경우에는 성형체에 기공은 적게 발생하지만 성형시 금형으로부터 성형체의 취출이 어렵게 된다.On the other hand, when the content of the binder is less than the above standard value, pores are less generated in the molded body, but it is difficult to take out the molded body from the mold during molding.

상기한 바와 같이 제1 단계(S100)에서 일정 비율로 혼합된 세라믹 발열체는 제2 단계(S200)의 성형 및 건조공정을 거치게 된다.As described above, the ceramic heating element mixed at a predetermined ratio in the first step S100 is subjected to the forming and drying process of the second step S200.

상기 제2 단계(S200)에서는 세라믹 발열체를 일정 형상을 갖는 성형틀에 주입함으로서 성형한다. 즉, 전자렌지, 조리기구, 난방기구 등과 같은 다양한 분야에 맞도록 적절하게 그 형상을 성형하게 된다. 그리고, 성형된 세라믹을 일정 온도로 건조시킴으로써 일정한 형상을 갖는 세라믹 발열체를 제조하게 된다.In the second step (S200) is molded by injecting a ceramic heating element into a mold having a predetermined shape. That is, the shape is appropriately molded to fit various fields such as a microwave oven, cooking utensils, heating appliances, and the like. And, by drying the molded ceramic at a constant temperature to produce a ceramic heating element having a certain shape.

그리고, 상기 제3 단계(S300)에서는 이러한 세라믹 발열체를 소성가공을 하게 된다. 즉, 상기 세라믹 발열체를 고온의 소결로에서 가열함으로써 일정한 형상과 강도를 갖도록 한다.In the third step S300, the ceramic heating element is subjected to plastic working. That is, the ceramic heating element is heated in a high temperature sintering furnace to have a constant shape and strength.

상기 소성공정에서는 세라믹 발열체를 소결로(Sintering Furnace)에 장입하고, 약 1300 ~ 1400℃ 온도범위 이내에서 가열하게 된다. 이러한 공정을 통하여 각 세라믹 입자가 가열에 의하여 서로 고착되어 치밀화되는 소결(Sintering)과정을 거치면서 기계적 강도가 향상된다. 또한, 탈수분해, 탄산염 광물분해, 분해용융 등의 열화학변화가 동시에 진행된다.In the firing process, the ceramic heating element is charged into a sintering furnace and heated within a temperature range of about 1300 to 1400 ° C. Through this process, each ceramic particle is bonded to each other by heating and undergoes a sintering process, whereby the mechanical strength is improved. In addition, thermochemical changes such as dehydration, carbonate mineralization, and decomposition melting proceed simultaneously.

상기한 바와 같이, 각 단계들을 거치면서 제조된 세라믹 발열체는 제4 단계(S400)를 거치면서 마무리된다. 즉, 소성가공된 세라믹 발열체를 연삭 혹은 절단작업등을 통하여 마감처리 함으로써 제품화하게 된다.As described above, the ceramic heating element manufactured by passing through each step is finished while passing through the fourth step (S400). That is, the plastic processed ceramic heating element is finished by grinding or cutting to produce a product.

한편, 도2 에는 이러한 세라믹 발열체의 실제 적용예로서 전자렌지에 적용되는 것을 도시한다.On the other hand, Figure 2 shows that it is applied to the microwave oven as an actual application example of such a ceramic heating element.

도시된 바와 같이, 전자렌지용 조리용기(MPC;Microwave Pot Cooker;1)는 턴테이블(Turn Table;도시안됨)의 상부에 구비되는 내열유리(3)상에 위치함으로써 마이크로파에 의하여 조리물을 조리하는 기구이다.As illustrated, a microwave cooking vessel (MPC) 1 is placed on a heat-resistant glass 3 provided on an upper portion of a turn table (not shown) to cook food by microwaves. It is an appliance.

이러한 조리용기에 있어서, 상기 세라믹 발열체(5)는 베이스(Base;6)와, 상기 베이스(6)의 상부에 위치하여 조리물(8)을 적치하는 트레이(7)의 사이에 위치하게 된다. 그리고, 전자렌지의 마그네트론(도시안됨)으로부터 방사된 마이크로파가 상기 세라믹 발열체(5)에 도달하는 경우, 상기 세라믹 발열체(5)는 단시간내에 약 200 ~ 300℃ 온도범위의 열을 발산한다. 따라서, 상기 트레이(7)의 내부에 적치된조리물(8)은 적절하게 가열됨으로써 효과적으로 조리된다.In such a cooking vessel, the ceramic heating element 5 is positioned between a base 6 and a tray 7 located above the base 6 to place the food 8 therein. When the microwaves emitted from the magnetron (not shown) of the microwave reach the ceramic heating element 5, the ceramic heating element 5 emits heat in a temperature range of about 200 to 300 ° C. in a short time. Therefore, the cooking material 8 accumulated inside the tray 7 is cooked effectively by appropriately heating.

본 발명에 따른 발열물질에 의하여 제조된 전자렌지용 발열체의 가열실험 결과는 다음과 같다.The heating test results of the microwave heating element manufactured by the heating material according to the present invention are as follows.

본 발명The present invention 종래Conventional 시간time 4분4 minutes 200도200 degrees 180도180 degrees 10분10 minutes 230도230 degrees 200도200 degrees 15분15 minutes 260도260 degrees 210도210 degrees

상기한 실험 결과에서 알 수 있듯이, 본 발명에 따른 발열물질에 의하여 제조된 발열체의 경우 종래의 발열체에 비하여 10％ 정도의 발열효율이 향상된다.As can be seen from the above experimental results, in the case of the heating element manufactured by the heating material according to the present invention, the heating efficiency of about 10% is improved as compared with the conventional heating element.

상술한 바와 같이 본 발명의 바람직한 실시예에 따른 세라믹 발열체는 산화 알루미늄(Al2O3), 산화규소(SiO2), 탄화규소(SiC), 산화 마그네슘(MgO) 등의 성분으로 이루어지고, 또한 그 구성 비율을 적절하게 조절함으로써 단시간내에 고온의 열을 발생시킬 수 있는 장점이 있다.As described above, the ceramic heating element according to the preferred embodiment of the present invention is composed of components such as aluminum oxide (Al 2 O 3 ), silicon oxide (SiO 2 ), silicon carbide (SiC), magnesium oxide (MgO), and the like. By appropriately adjusting the composition ratio, there is an advantage that can generate high temperature heat in a short time.

본 발명은 당해 발명이 속하는 분야의 통상의 지식을 가진 자라면 누구든지 특허청구의 범위에서 청구하는 본 발명의 요지를 벗어나지 않고도 다양하게 변경실시 할 수 있으므로 상술한 특정의 바람직한 실시예에 한정되지 아니한다.The present invention can be variously modified by those skilled in the art to which the present invention pertains without departing from the scope of the present invention as claimed in the claims, and is not limited to the specific preferred embodiments described above. .

Claims (3)

마이크로파에 의해 가열되는 세라믹 발열체로서,A ceramic heating element heated by microwaves, 산화 알루미늄(Al2O3)10wt% ~ 20wt%와, 산화규소(SiO2)20wt% ~ 30wt%와, 탄화규소(SiC) 20wt% ~ 60wt%와, 산화마그네슘(MgO) 1wt% ~ 10wt%와, 점토 1wt% ~ 10wt%와, 바인더(Binder) 1wt% ~ 10wt%를 포함하는 세라믹 발열체.10 wt% to 20 wt% of aluminum oxide (Al 2 O 3 ), 20 wt% to 30 wt% of silicon oxide (SiO 2 ), 20 wt% to 60 wt% of silicon carbide (SiC), and 1 wt% to 10 wt% of magnesium oxide (MgO) And, ceramic heating element comprising 1wt% ~ 10wt% clay, 1wt% ~ 10wt% binder (Binder). 산화 알루미늄(Al2O3), 산화규소(SiO2), 탄화규소(SiC), 산화 마그네슘(MgO), 점토, 바인더를 준비하고 혼합(Mixing)하는 제1 단계와;A first step of preparing and mixing aluminum oxide (Al 2 O 3 ), silicon oxide (SiO 2 ), silicon carbide (SiC), magnesium oxide (MgO), clay, and a binder; 상기 제1 단계에서 혼합된 원료를 일정한 형상으로 성형(Forming)하고 건조(Drying)하는 제2 단계와;A second step of forming and drying the raw materials mixed in the first step into a predetermined shape; 상기 제2 단계에서 성형된 세라믹 발열체를 소성(Firing)하는 제3 단계와; 그리고A third step of firing the ceramic heating element molded in the second step; And 세라믹 발열체를 마무리 가공(Finishing)하는 제4 단계를 포함하는 세라믹 발열체 제조방법.A ceramic heating element manufacturing method comprising a fourth step of finishing the ceramic heating element (Finishing). 제2 항에 있어서, 상기 제1 단계에서 산화 알루미늄(Al2O3)은10wt% ~ 20wt%, 산화규소(SiO2)는20wt% ~ 30wt%, 탄화규소(SiC)는 20wt% ~ 60wt%, 산화마그네슘(MgO)은 1wt% ~ 10wt%, 점토는 1wt% ~ 10wt%, 바인더(Binder)는 1wt%~ 10wt%의 비율로 혼합되는 세라믹 발열체 제조방법.The method of claim 2, wherein in the first step, aluminum oxide (Al 2 O 3 ) is 10wt% ~ 20wt%, silicon oxide (SiO 2 ) 20wt% ~ 30wt%, silicon carbide (SiC) 20wt% ~ 60wt% Magnesium oxide (MgO) is 1wt% ~ 10wt%, clay is 1wt% ~ 10wt%, binder (Binder) is a ceramic heating element manufacturing method is mixed in a ratio of 1wt% ~ 10wt%.
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WO2009139552A3 (en) * 2008-05-14 2010-03-25 Son Byeong-Jae Heat generating ceramic vessel for microwave oven and method for manufacturing the heat generating ceramic vessel
KR100937232B1 (en) * 2008-08-12 2010-01-15 김정환 Heat generating plate for microwave oven and fabrication method thereof
KR101493744B1 (en) * 2013-07-07 2015-02-16 삼명엔지니어링(주) Electric bidet boiler utilzing fine ceramic heater
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