THERMISTOR Thermally Sensitive Resistor. NTC CHARACTERISTIC PRODUCT EXAMPLES APPLICATIONS
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1 AMC, Bali 3-6 Des 2009 Electrical Characteristics of CuFe 2 O 4 Thick Film Ceramics With Different Glass Frit Concentrations Fired at 1000 o C for Negative Thermal Coefficient (NTC) Thermistor Wiendartun 1, Dani Gustaman Syarif 2 1) Department of Physics, UPI, Jl.Dr Setiabudhi 229 Bandung, wien_upi@yahoo.com 2) PTNBR BATAN, Jl.Tamansari 71 Bandung, danigusta@yahoo.com
2 INTRODUCTION THERMISTOR Thermally Sensitive Resistor. NTC CHARACTERISTIC PRODUCT EXAMPLES APPLICATIONS R vs T- THERMISTOR Current limiter thermistor Incubator Specialize Thermistor Computer
3 INTRODUCTION (Continuation) Important electronic component. - Sectors: Biomedical, aerospace, instrumentation, communications, automotive and HVACR (Heating, Ventilation, Air conditioning and Refrigeration). -Application : Temperature sensor measurement, current limiter, circuit compensation, suppression of in rush- current, flow rate sensor and pressure sensor. It is necessary to get capability in self producing thermistor by utilizing material abundant in Indonesia such us yarosite mineral (Fe 2 O 3 ) CuFe 2 O 4 based-thick film for NTC Thermistor, with glass frit concentration ( 0; 2,5 ;5 weight % ) The thermistor in the form of thick film is possible for miniaturization and integration. Advantages : more practical, profitable economically, need a few material, and fired at law temperature.
4 YAROSITE MNERAL Asean Microscopy Conference, (AMC) Bali 3-6 Des 2009
5 EXPERIMENT : Powder of Fe 2 O 3 (derived from yarosite mineral) and CuO Crushing Sieving Glass Frit( 0; 2,5; 5 %) Organic vehicle Mixing Paste Characterization: 1. Electrical 2. XRD 3. Microstructural (SEM) Screen Printing Firing ( 1000 C) Electroding Thick Film Ceramics Flow diagram of the experiment procedure.
6 SCREEN PRINTING Screen screen stress Squeeze Coated Film snap-off distance Paste Substrate Hibah BERSAING, 13 Oktober 2008
7 Electrical Characteristic R = R 0. Exp.(B/T) Ln R = B/T + Ln Ro Ea = B.k α = - B/T 2 R = Thermistor resistance R o = Resistance at the infinite temperature B = Thermistor constant T = Temperature of thermistor in Kelvin Ea = Activation energy K = The Boltzmann constant Α = Sensitivity of thermistor
8 RESULT : Chemical composition of Fe 2 O 3 powder derived from yarosite table No. Component Concentration (Weight %) 1 Fe 2 O Al 2 O SiO TiO MgO K 2 O CaO Na 2 O MnO 0.09
9 RESULT Thick Film ( yarosite) Visual appearance Alumina Substrat Thick film before fired Thick film fired at 1100 C/1 hr ISC -UNPAD, Oktober 2008
10 A typical thick film thermistor Sensor Layer Silver Electrodes
11 RESULT (XRD) (without glass frit concentration) (with 2,5 % glass frit concentration) (with 5,0 % glass frit concentration) XRD profile of CuFe 2 O 4 based-thick film
12 RESULTS (Microstructure) (without glass frit concentration) (with 2,5 % glass frit concentration) Microstructure of the CuFe 2 O 4 thick film
13 RESULTS (Electrical Characteristics) The relation between ln Electrical Resistivity and 1/T of CuFe 2 O 4 based-thick film fired at 1000oC for 1 hr (with : 0; 2,5, 5% glass frit concentration) Ln resistivity ( ) vs 1/T of CuFe 2 O 4 thick film ceramics.
14 RESULTS (Electrical Characteristics) Table of electrical characteristics of CuFe 2 O 4 thick film ceramics. No. Frit (%) (with : 0; 2,5, 5% glass frit concentration) B (K) Alfa (%/K) R SR (Mohm) ,46 6,9 2. 2, ,83 9, ,12 16,7 Market requirement for : B is 2000 o K is 2.2 %/ o K[7] RT = 10 ohm.cm -1 Mohm.cm [4].
15 CONCLUSIONS CuFe 2 O 4 thick film ceramics utilizing Fe 2 O 3 derived from yarosite mineral have been well fired at 1000 o C for 1 hour. with : 0; 2,5, 5% glass frit concentration. All of the thick films crystallize in tetragonal spinel. The SEM images showed that the effects of glass frit concentration make the grain size was smaller.. Electrical data showed that the larger the concentration, the larger the : resistance, constant and sensitivity. glass frit thermistor The value of thermistor constant (B) = o K and room temperature resistance (R RT ) = 6,9-16,7 MOhm of the produced CuFe 2 O 4 ceramics fitted market requirement.
16 THANK YOU ACKNOWLEGMENT The authors wish to acknowledge their deep gratitude to Directorate General of Higher Education(DIKTI), Ministry of National Education of Indonesian Government for financial support under HIBAH BERSAING program with contract No. 2784/H /H.40/PL/ 2009, 07 Mei 2009
17 LAMPIRAN APLIKASI THERMISTOR-1 Inkubator Bayi
18 APLIKASI THERMISTOR-2 Komputer
19 APLIKASI THERMISTOR-3 Pengukur suhu
20 APLIKASI THERMISTOR-4 Sensor Aliran Air
21 APLIKASI THERMISTOR- 5 Lampu neon Thermistor AC Pembatas Arus Listrik
22 BENTUK THERMISTOR-1 Thermistor Pembatas Arus
23 BENTUK THERMISTOR-2 Thermistor Gelas
24 BENTUK THERMISTOR-3 Thermistor Khusus
25 BENTUK THERMISTOR-4 Thermistor Lead Epoxy
THERMISTOR Thermally Sensitive Resistor. NTC CHARACTERISTIC PRODUCT EXAMPLES APPLICATIONS
ISC, UNPAD 30-3131 Oct 2008 Synthesis and Characterization of CuFe 2 O 4 Thick Film Ceramics for NTC Thermistor Using Yarosite as Raw Material Wiendartun 1 ),, Dani Gustaman Syarif 2 ) 1 ) Department of
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