KR0147999B1 - A ceramic composite for a ptc thermister - Google Patents
A ceramic composite for a ptc thermisterInfo
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- KR0147999B1 KR0147999B1 KR1019950011350A KR19950011350A KR0147999B1 KR 0147999 B1 KR0147999 B1 KR 0147999B1 KR 1019950011350 A KR1019950011350 A KR 1019950011350A KR 19950011350 A KR19950011350 A KR 19950011350A KR 0147999 B1 KR0147999 B1 KR 0147999B1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
- H01C7/02—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material having positive temperature coefficient
- H01C7/022—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material having positive temperature coefficient mainly consisting of non-metallic substances
- H01C7/023—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material having positive temperature coefficient mainly consisting of non-metallic substances containing oxides or oxidic compounds, e.g. ferrites
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- 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
- C04B35/45—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 copper oxide or solid solutions thereof with other oxides
- C04B35/4504—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 copper oxide or solid solutions thereof with other oxides containing rare earth oxides
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- 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
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
- C04B2235/3215—Barium oxides or oxide-forming salts thereof
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/74—Physical characteristics
- C04B2235/76—Crystal structural characteristics, e.g. symmetry
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Abstract
본 발명은 특정 온도에서 전기 저항값이 급격히 증가하는 PTC 써미스터용 세라믹 조성물을 개시한다. 본 발명은 Y2O3와 Sm2O3와 BaCO3와 CuO를 기본 조성물로 하는 Y1-xSmxBa2Cu3O7-y성분으로 이루어져 있으며, Y+Sm:Ba:Cu의 몰비가 1:2:3으로 이루어져 있는 것을 특징으로 하는 PTC 써미스터용 세라믹 조성물에 의해서 달성되며 이에 의해서 상온에서 통전되는 전류 양이 증대되어서 모터의 작동에 의한 전기 제품의 작동이 양호하고 또한 PTC 특성이 나타나는 전이 온도가 약 600℃ 정도이므로 고온에서 사용가능하고 3성분계로 이루어져 있으므로 제조비용이 절감되고 또한 제조 시간이 단축된다.The present invention discloses a ceramic composition for PTC thermistors in which the electrical resistance increases rapidly at a certain temperature. The present invention is composed of Y 1-x Sm x Ba 2 Cu 3 O 7-y component based on Y 2 O 3 and Sm 2 O 3 , BaCO 3 and CuO, the molar ratio of Y + Sm: Ba: Cu Is achieved by the ceramic composition for PTC thermistors, which is composed of 1: 2: 3, thereby increasing the amount of current supplied at room temperature, so that the operation of the electric product by the operation of the motor is good and the PTC characteristics are exhibited. Since the transition temperature is about 600 ° C., it can be used at high temperatures and consists of a three-component system, which reduces manufacturing costs and shortens manufacturing time.
Description
제1도는 Sm1Ba2Cu3O7-y성분을 시차 주사 열분석한 결과를 나타낸 그래프.1 is a graph showing the results of differential scanning thermal analysis of Sm 1 Ba 2 Cu 3 O 7-y component.
제2도는 본 발명에 따라서 제작된 세라믹 조성물의 X-ray 회절 무늬 변화를 나타낸 그래프.2 is a graph showing the X-ray diffraction pattern change of the ceramic composition prepared according to the present invention.
제3도는 본 발명에 따른 Y0.6Sm0.4Ba2Cu3O7-y 계 PTC 써미스터의 온도 증가에 대한 저항값의 증가 변화를 나타낸 그래프.3 is a graph showing a change in the resistance value with increasing temperature of the Y 0.6 Sm 0.4 Ba 2 Cu 3 O 7- y type PTC thermistor according to the present invention.
본 발명은 특정 온도에서 전기 저항값이 급격히 증가되는 PTC 써미스터용 세라믹 조성물에 관한 것으로서, 특히 상온에서 낮은 비저항값을 갖고 전이 온도를 향상시킬 수 있도록, Y1-xSmxBa2Cu3O7-y성분으로 이루어진 PTC 써미스터용 세라믹 조성물에 관한 것이다.The present invention relates to a ceramic composition for PTC thermistor which has a rapid increase in electrical resistance at a specific temperature, and in particular, Y 1-x Sm x Ba 2 Cu 3 O 7 to improve the transition temperature with a low specific resistance at room temperature. A ceramic composition for a PTC thermistor consisting of a -y component.
일반적으로, 써미스터는 열에 민감한 반도체성 저항체로서, 온도의 증가에 따른 전기 저항값의 증감이 나타나며 이러한 써미스터는 특정한 온도에서 전기 저항값이 급격히 증가하는 정온도 특성을 나타내는 PTC 써미스터 및 특정한 온도에서 전기 저항값이 급격히 감소하는 부온도 특성을 나타내는 NTC 써미스터로 크게 대별된다.In general, thermistors are heat-sensitive semiconducting resistors, which exhibit an increase or decrease in electrical resistance with increasing temperature, and these thermistors are PTC thermistors that exhibit a constant temperature characteristic in which the electrical resistance increases rapidly at a specific temperature, and electrical resistance at a specific temperature. It is roughly classified as an NTC thermistor which exhibits a negative temperature characteristic whose value decreases rapidly.
이때, PTC 써미스터는 그의 정온도 특성에 의하여 저온 상태에서 낮은 비저항값을 가져 전류을 잘 통전시킬 수 있는 반면에 특정한 고온에 도달되면 주울열 작용등에 의해 전기 저항값이 급격히 증가되어 부도체의 특성을 나타내므로 항온 히터, 전류 제한 소자, 또는 온도 센서등에 널리 사용된다.At this time, the PTC thermistor has a low specific resistance value at low temperature due to its constant temperature characteristic, so that the current can be energized well, but when a certain high temperature is reached, the electric resistance value is rapidly increased due to Joule's heat action. Widely used in constant temperature heaters, current limiting elements, or temperature sensors.
한편, 종래의 일실시예에 따르면 PTC 써미스터는 BaTio3계세라믹 조성물을 주성분으로 하여 제조되며 이러한 PTC 써미스터는 상온에서 약 100Ω-cm 정도의 비저항값을 가지므로 전류대 시간 특성은 대전류의 통전시 급격하게 전류가 감소되고 소전류의 통전시 소정 시간후에 전류가 감소되는 동특성이 크게 나타나게 되며 이에 의해서 상온에서 통전되는 전류의 양이 적게되므로 모터의 작동이 불충분하게 이루어진다.On the other hand, according to the conventional embodiment, the PTC thermistor is manufactured based on the BaTio 3- based ceramic composition, and since the PTC thermistor has a specific resistance value of about 100Ω-cm at room temperature, the current vs. time characteristic is rapidly changed when the large current is energized. In this case, the current is decreased and the dynamic characteristic of the current decreases after a predetermined time when the small current is energized is large, and the amount of current that is energized at room temperature is reduced, thereby insufficiently operating the motor.
또한, 종래의 실시예에 따라서 BaTiO3성분으로 이루어진 PTC 써미스터는 약 130 내지 150℃ 정도의온도 범위에서 전기 저항값이 급격히 증가하는 전이 온도를 가지므로 약 300℃ 의 고온에서 정온도 특성의 저항값을 갖는 써미스터를 필요로 하는 보일러 및 발전기에는 사용이 불가하다.In addition, according to the conventional embodiment, the PTC thermistor made of BaTiO 3 component has a transition temperature at which the electrical resistance increases rapidly in the temperature range of about 130 to 150 ° C., so that the resistance value of the constant temperature characteristic at a high temperature of about 300 ° C. It is not available for boilers and generators that require thermistors.
이때, 상기된 바와 같은 문제점을 해소시키기 휘한 종래의 일실시예에 따르면, 종래의 BaTiO3계 세라믹 조성물에 V,Mn 또는 흑연과 같은 소량의 불순물을 첨가하여 상온에서 비저항값을 약 20Ω-cm 정도로 낮추었으며 또한 PbTiO3를 상기 BaTiO3계 세라믹 조성물에 첨가시킴으로서 PTC 써미스터의 전이 온도를 향상시킬 수 있었다.At this time, according to a conventional embodiment to solve the problems as described above, by adding a small amount of impurities, such as V, Mn or graphite to the conventional BaTiO 3 -based ceramic composition to a specific resistance value of about 20Ω-cm at room temperature In addition, the transition temperature of the PTC thermistor could be improved by adding PbTiO 3 to the BaTiO 3 -based ceramic composition.
그러나, 상기된 바와 같이 상온 비저항을 낮추기 위하여 소량의 불순물을 첨가시킴으로서 많은 성분의 분말 첨가에 의한 제조비용이 증가되며 또한 5성분계 이상으로 제조되므로 제조 시간이 오래 요구된다는 문제점이 발생된다.However, by adding a small amount of impurities to lower the room temperature specific resistance as described above, the manufacturing cost is increased by the addition of powder of many components, and the manufacturing time is long because the manufacturing cost is longer than five components.
한편, 종래의 PTC 써미스터의 전이온도를 증가시키기 위하여 BaTiO3계 세라믹 조성물에 PbTiO3를 첨가하는 경우에 휘발성이 강한 Pb 성분의 첨가 효과를 향상시키기 위하여 과량의 Pb 첨가시키며 이에 의해서 인체에 유해한 공해 유발을 야기시킬 수 있다는 문제점이 발생된다.On the other hand, when PbTiO 3 is added to BaTiO 3 based ceramic compositions to increase the transition temperature of conventional PTC thermistors, excess Pb is added to improve the effect of adding volatile Pb components, thereby causing harmful pollution to the human body. Problem arises.
본 발명은 상기와 같은 종래의 문제점을 해소시키기 위하여 안출된 것으로 그 목적은 낮은 비저항값을 가져서 상온에서 전자제품의 사용시 신뢰성을 향상시키며 또한 PTC 특성의 전이 온도를 향상시켜서 고온에서 사용가능할 뿐만 아니라 PTC 특성이 전이 온도를 향상 시켜서 고온에서 사용가능할 뿐만 아니라 PTC 써미스터의 제조 비용 및 제조 시간을 단축시킬 수 있도록 Y1-xSmxBa2Cu3O7-y성분으로 이루어져 있는 PTC 써미스터용 세라믹 조성물을 제공하는 데 있다.The present invention has been made to solve the above-mentioned conventional problems. The object of the present invention is to have a low specific resistance to improve reliability when using electronic products at room temperature, and to improve the transition temperature of PTC characteristics, and thus to be usable at high temperatures. The ceramic composition for PTC thermistors is composed of Y 1-x Sm x Ba 2 Cu 3 O 7-y components to improve the transition temperature so that it can be used at high temperature and shorten the manufacturing cost and manufacturing time of PTC thermistor. To provide.
상기의 목적은 분말 형태의 Y2O3와 Sm2O3와 BaCO3와 CuO를 기본 조성물로 하며 이러한 기본 조성물은 Y+Sm:Ba:Cu의 몰비가 1:2:3으로 이루어질 수 있도록 소정의 몰비로 혼합시켜서 고상 반응 방법에 의하여 제조된 Y1-xSmxBa2Cu3O7-y성분으로 이루어져 있는 것을 특징으로 하는 PTC 써미스터용 세라믹 조성물에 의해 달성 될 수 있다.The above object is a powder composition of Y 2 O 3 and Sm 2 O 3 and BaCO 3 and CuO as a base composition and the base composition is such that the molar ratio of Y + Sm: Ba: Cu is 1: 2: 3 It can be achieved by the ceramic composition for PTC thermistor, characterized in that consisting of Y 1-x Sm x Ba 2 Cu 3 O 7-y component prepared by the solid phase reaction method by mixing in a molar ratio of.
이하, 첨부된 도면을 참조하여 본 발명의 바람직한 실시예를 상세히 설명하면 다음과 같다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.
먼저, 본 발명에 따르면, 정온도 특성을 나타내는 PTC 써미스터용 세라믹 조성물은 Y2O3와 Sm2O3와 BaCO3와 CuO를 기본 조성물로 하는Y1-xSmxBa2Cu3O7-y성분으로 이루어져 있으며, 이러한 Y1-xSmxBa2Cu3O7-y성분은 상기 기본 조성물들을 분말 형태로 형성시킨 후 소정의 몰비로 혼합시켜서 고온에서 용융시키는 고상 반응(Solid State Reaction) 방법에 의하여 제조된다.First, according to the present invention, the ceramic composition for PTC thermistor exhibiting the positive temperature characteristics is Y 1-x Sm x Ba 2 Cu 3 O 7- with Y 2 O 3 , Sm 2 O 3 , BaCO 3 and CuO as the basic composition. It consists of y component, Y 1-x Sm x Ba 2 Cu 3 O 7-y component is a solid state reaction to form the base composition in the form of a powder and then mixed in a predetermined molar ratio to melt at a high temperature (Solid State Reaction) It is manufactured by the method.
이때, 본 발명에 따른 PTC 써미스터용 세라믹 조성물을 제조하기 위한 상기 기본 조성물의 순도는 각각 99.9%로 이루어져 있으며, 또한 상기 고상 반응 방법을 수행하기 위하여 혼합되는 상기 기본 조성물의 혼합 몰비는 상기Y1-xSmxBa2Cu3O7-y성분을 구성하고 있는 Y+Sm:Ba:Cu의 몰비가 1:2:3으로 이루어질 수 있도록 형성된다.At this time, the purity of the base composition for producing a ceramic composition for PTC thermistors according to the present invention is each composed of 99.9%, and the mixing molar ratio of the base composition to be mixed to perform the solid phase reaction method is the Y 1- The molar ratio of Y + Sm: Ba: Cu constituting the x Sm x Ba 2 Cu 3 O 7-y component is formed to be 1: 2: 3.
한편, 본 발명에 따른 세라믹 조성물을 형성시킨 상기 Y1-xSmxBa2Cu3O7-y성분을 구성하고 있는 희토류 원소의 몰비의 합은 1의 값을 가지므로 이러한 희토류 원소중 상기 Sm 원소의 첨가 몰비를 나타내는 x의 값은 약 0.0 내지 1.0 정도 범위의 값을 가지며, 바람직하게는 약 0.1 내지 0.5 정도 범위의 값을 갖고, 더욱 바람직하게는 약 0.4의 값을 갖는다.On the other hand, since the sum of the molar ratios of the rare earth elements constituting the Y 1-x Sm x Ba 2 Cu 3 O 7 -y component forming the ceramic composition according to the present invention has a value of 1, the Sm of the rare earth elements The value of x representing the addition molar ratio of the element has a value in the range of about 0.0 to 1.0, preferably a value in the range of about 0.1 to 0.5, and more preferably a value of about 0.4.
또한, Y1-xSmxBa2Cu3O7-y성분을 구성하고 있는 산소의 몰비는 7의 값의 값을 갖는 것이 바람직하지만 규명되지 않은 이유에 의하여 y의 값에 해당하는 몰비가 증감하게 되며 이러한 y의 값은 0.5 이하 정도이다. 그러나, 상기된 바와 같은 Y1-xSmxBa2Cu3O7-y성분을 구성하고 있는 산소의 몰비는 본 발명의 요지를 변경시키지 않는다.The molar ratio of oxygen constituting the Y 1-x Sm x Ba 2 Cu 3 O 7-y component preferably has a value of 7, but the molar ratio corresponding to the value of y increases or decreases for reasons not identified. This y value is about 0.5 or less. However, the molar ratio of oxygen constituting the Y 1-x Sm x Ba 2 Cu 3 O 7 -y component as described above does not change the gist of the present invention.
한편, Y1-xSmxBa2Cu3O7-y성분으로 이루어진 PTC 써미스터용 세라믹 조성물을 제조하기 위한 고상 반응방법에 따르면, Y2O3와 Sm2O3와 BaCO3와 CuO으로 이루어진 기본 조성물을 분말 형태로 형성시킨 후 상기 Y1-xSmxBa2Cu3O7-y성분을 구성하고 있는 Y+Sm:Ba:Cu의 몰비가 1:2:3으로 이루어질 수 있도록 상기 기본 조성물을 소정의 몰비로 혼합시킨다.On the other hand, according to the solid-state reaction method for producing a ceramic composition for PTC thermistor consisting of Y 1-x Sm x Ba 2 Cu 3 O 7-y component, consisting of Y 2 O 3 and Sm 2 O 3 and BaCO 3 and CuO After the basic composition is formed in powder form, the basic ratio of Y + Sm: Ba: Cu constituting the Y 1-x Sm x Ba 2 Cu 3 O 7-y component may be 1: 2: 3. The composition is mixed in the desired molar ratio.
즉, 분말 형태의 상기 기본 조성물을 마노막자사발에 넣고 에틸 알코올을 혼합매체로 하여 혼합시켜 혼합 조성물을 고상으로 형성시킨 후 상기 고상의 혼합 조성물을 분쇄기키고 이에 의해서 분쇄처리된 상기 혼합 조성물을 약 5*103kgf/cm2의 압력으로 약 3분간 압축시키는 분말 야금공정에 의하여 직경이 약 15mm 이고 두께가 약 1.5mm 정도인 원판형 시편을 성형시킨다.That is, the basic composition in powder form is put in agate mortar and mixed with ethyl alcohol as a mixed medium to form a mixed composition in a solid phase, and then the mixed composition of the solid phase is pulverized, thereby crushing the mixed composition about 5 * A disk-shaped specimen about 15 mm in diameter and about 1.5 mm thick is formed by a powder metallurgical process that is pressed for about 3 minutes at a pressure of 10 3 kgf / cm 2 .
이 후에, 상기 원판형 시편을 산소 분위기하에서 시간당 약 150℃ 정도로 가열시켜 약 920℃정도의 고온에서 약 14시간동안 유지시킨 후 상기 시편의 온도를 시간당 약 100℃의 온도 속도로 하강시켜서 약 820℃의 온도에 약 2시간정도 유지시키고 또한 약 500℃의 온도에 약 6시간정도 유지시키며 이 후에 약 200℃의 온도에서 퀀칭시킴으로서 Y1-xSmxBa2Cu3O7-y성분으로 이루어져 있는 본 발명에 따른 PTC 써미스터용 세라믹 조성물이 제작되었다.Thereafter, the disc-shaped specimen was heated in an oxygen atmosphere at about 150 ° C. per hour and maintained at a high temperature of about 920 ° C. for about 14 hours, and then the temperature of the specimen was lowered at a temperature rate of about 100 ° C. per hour to about 820 ° C. It is maintained at about 2 hours at and the temperature of about 500 ℃ for about 6 hours and then quenched at about 200 ℃ temperature consisting of Y 1-x Sm x Ba 2 Cu 3 O 7-y component Ceramic compositions for PTC thermistors according to the present invention were produced.
한편, 제1도에 나타난 그래프는 희토류 원소인 Sm의 몰비가 1의 값을 갖는 SmxBa2Cu3O7-y성분을 시차 주사 열분석한 결과이지만, 이러한 결과는 상기된 바와 같은 공정에 의하여 제조된 Y1-xSmxBa2Cu3O7-y성분에 적용가능하다. 따라서, 열시차 분석한 결과 약 835℃ 및 935℃에서 흡열 피크현상이 발생되었으며 이러한 흡열 피크중 약 835℃에서의 흡열 피크는 CO2분해에 의한 것이고 또한 약 935℃ 에서의 흡열 피크는 상기 시편의 용융에 의한 것이다.On the other hand, the graph shown in Figure 1 is the result of differential scanning thermal analysis of the Sm x Ba 2 Cu 3 O 7-y component having a molar ratio of rare earth element Sm of 1, but these results are in the process as described above It is applicable to the Y 1-x Sm x Ba 2 Cu 3 O 7-y component prepared by the above. Therefore, the endothermic peak phenomenon occurred at about 835 ° C and 935 ° C, and the endothermic peak at about 835 ° C was due to CO 2 decomposition, and the endothermic peak at about 935 ° C was By melting.
또한, 제2도에 나타난 X-ray 회절 사진은 본 발명에 따른 Y1-xSmxBa2Cu3O7-y성분중 상기 희토류 원소인 Sm의 첨가 몰비 x의 값을 0.0에서 1.0까지 증가시키면서 X-ray 회절 무늬의 변화를 측정한 것으로 상기 회절 사진에 나타나 있는 바와 같이 본 발명에 따라서 Y1-xSmxBa2Cu3O7-y성분으로 구성된 PTC 써미스터용 세라믹 조성물의 결정구조는 특정한 결정면에 상이한 크기의 피크가 발생되며 이에 의해서 세개 결정축의 격자상수가 서로 상이한 사방 정계를 갖는다는 것을 인지할 수 있다.Further, the X-ray diffraction photos shown in Figure 2 increases the value of the addition of a molar ratio x of the rare earth elements of Y 1-x Sm x Ba 2 Cu according to the present invention 3 O 7-y component Sm from 0.0 to 1.0 The crystal structure of the ceramic composition for PTC thermistor composed of Y 1-x Sm x Ba 2 Cu 3 O 7-y component according to the present invention as measured in the X-ray diffraction pattern was measured while It can be appreciated that peaks of different magnitudes occur in a particular crystal plane, whereby the lattice constants of the three crystal axes have different tetragonal systems.
따라서, BaTiO3성분으로 이루어진 종래의 PTC 써미스터용 세라믹 조성물은 결정립내에서 발생된 산소공공이 확산 속도의 차이에 의하여 공정이 진행됨에 따라서 입계로 이동하게 되고 이로 인하여 표면준위가 생성되어 전자를 포획하기 때문에 입계부근에서 생성된 전하 공핍층에 의한 쇼트키(schotty) 장벽에 의하여 PTC 특성을 나타내는 반면에 Y1-xSmxBa2Cu3O7-y성분으로 이루어진 본 발명에 따른 PTC 써미스터용 분말 조성물은 상기된 바와 같이 고온상태에서의 결정 구조가 사방 정계로 유지되어 있으므로 벌크(bulk)에 의한 PTC 특성을 나타낸다.Therefore, in the conventional ceramic composition for PTC thermistor composed of BaTiO 3 component, the oxygen pores generated in the crystal grains are moved to grain boundaries as the process proceeds due to the difference in diffusion rate, and thus the surface level is generated to capture electrons. Due to the Schottky barrier due to the charge depletion layer generated near the grain boundary, the PTC thermistor powder according to the present invention composed of Y 1-x Sm x Ba 2 Cu 3 O 7-y components The composition exhibits PTC characteristics due to bulk since the crystal structure at high temperature is maintained in a tetragonal system as described above.
한편, 본 발명의 바람직한 실시예에 따라서 희토류 원소인 Sm의 첨가 몰비가 0.4의 값을 갖는 Y0.6Sm0.4Ba2Cu3O7-y성분으로 제작된 세라믹 조성물의 온도증가에 따른 전기 저항값의 변화는 제3도에 그래프로 나타나 있으며, 이러한 그래프의 결과 본 발명에 따라서 Y1-xSmxBa2Cu3O7-y성분으로 이루어져 있는 PTC 써미스터용 세라믹 조성물은 상온에서 약 3.12Ω-cm 정도의 비저항값을 가지며 또한 온도가 증가 하면서 상기 비저항값은 완만하게 증가하다가 약 600℃에서 급격히 증가하게 되며 이에 의해서 본 발명에 따른 세라믹 조성물의 전이 온도는 약 600℃의 고온에서 형성된다는 것을 인지할 수 있다.On the other hand, according to a preferred embodiment of the present invention the electrical resistance value of the ceramic composition made of a Y 0.6 Sm 0.4 Ba 2 Cu 3 O 7-y component having an addition molar ratio of rare earth element Sm of 0.4 value of The change is shown graphically in FIG. 3, and as a result of this graph, the ceramic composition for PTC thermistor consisting of Y 1-x Sm x Ba 2 Cu 3 O 7-y component is about 3.12Ω-cm at room temperature. It can be appreciated that the specific resistance has a degree of resistivity and the temperature increases gradually and then increases rapidly at about 600 ° C. whereby the transition temperature of the ceramic composition according to the invention is formed at a high temperature of about 600 ° C. Can be.
따라서, 본 발명에 따르면, PTC 써미스터는 낮은 상온 비저항 값을 가지므로 상온에서 통전되는 전류 양이 증대되어서 모터의 작동에 의한 전기 제품의 작동이 양호하고 또한 PTC 특성이 나타나는 전이 온도가 약 600℃ 정도이므로 고온에서 사용가능하고 3성분계로 이루어져 있으므로 제조비용이 절감되고 또한 제조 시간이 단축된다.Therefore, according to the present invention, since the PTC thermistor has a low room temperature specific resistance value, the amount of current that is energized at room temperature is increased, so that the operation of the electric product by the operation of the motor is good and the transition temperature at which the PTC characteristic is exhibited is about 600 ° C. Because it can be used at high temperatures and consists of a three-component system, the manufacturing cost is reduced and the manufacturing time is shortened.
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