Additive of Al O B XRD profiles of CuFe2O4 based- ceramics Electrical Characteristics CuFe 2 O 4 Ceramics With and Without Al 2 O 3 for Negative Thermal Coefficient (NTC) Thermistor Wiendartun 1) , Dani Gustaman Syarif 2) , Arief Permadi 1) 1) Jurusan Fisika FMIPA UPI, Jl.Dr Setiabudhi 229 Bandung, email: [email protected]2) PTNBR BATAN, Jl.Tamansari 71 Bandung; email: [email protected]THERMISTORThermally Sensitive Resistor. INTRODUCTION NTC CHARACTERISTIC PRODUCT EXAMPLES Current limiter thermistor Specialize Thermistor APPLICATIONS Incubator Computer No. No. CuO CuO Fe Fe 2 O 3 Al Al 2 O 3 1. 1. 2. 2. 3. 3. 40 40 40 40 40 40 60 60 59 59 55 55 0 1 5 SAMPLE COMPOSITION IN MOLE % TABLE R = R 0 . Exp.(B/T) Ea = B.k α = - B/T 2 R = Thermistor resistance R 0 = Resistance at the infinite temperature B = Thermistor constant T = Temperature of thermistor Ea = Activation energy k = The Boltzmann constant α = Sensitivity of thermistor ELECTRICAL CHARACTERISTIC IMPORTANT ELECTRONIC COMPONENT •Sectors : Biomedical, aerospace, instrumentation, communications, automotive and HVACR (Heating, Ventilation, Air conditioning and Refrigeration). RESULT (XRD) RESULT (ELECTRICAL CHARACTERISTIC) No. Additive of Al 2 O 3 (mol %) B ( o K) (%/ o K) 1. 2. 3. 0 1 5 2862 3208 3958 3.22 3.61 4.46 CuO Fe 3 O 4 SiO 2 MIXING CALCINATION CRUSHING 800 °C/2 h PRESSING CHARACTERIZATION XRD Electrical Microstructural 3, 9 ton/Cm 2 SINTERING 1100 ºC/2 h Sintering Furnace XRD Optical Microscope 0.0026 0.0027 0.0028 0.0029 0.0030 0.0031 0.0032 0.0033 4.0 4.2 4.4 4.6 4.8 5.0 5.2 5.4 5.6 5.8 6.0 6.2 6.4 6.6 6.8 CuFe 2 O 4 + 0%Al 2 O 3 CuFe2O4+ 1%Al2O3 CuFe 2 O 4 + 5%Al 2 O 3 Ln resistivitas 1/T (K -1 ) All CuFe 2 O 4 base-ceramic crystallized in tetragonal structure. Thermistor constant (B) and sensitivity (a) of the CuFe 2 O 4 base- ceramics increase with the increase of Al 2 O 3 concentration. This means that the additionof Al 2 O 3 can be used as a controlling parameter. However, the addition of Al 2 O 3 decreases the electrical stability of the CuFe 2 O 4 base-ceramics. Only sample without Al 2 O 3 and that added with 1 mole % Al 2 O 3 fit the electrical stability condition. Heating at 150 o C for 200 hours can be used to make CuFe 2 O 4 base-ceramic stable electrically. BetaTHERM Sensors [on line]. Available: http://www.betatherm.com . E.S. Na, U.G. Paik, S.C.Choi, “The effect of a sintered microstructure on the electrical properties of a Mn-Co-Ni-O thermistor”, Journal of Ceramic Processing Research, Vol.2, No. 1, pp 31-34, 2001. K. PARK, I.H. HAN, “Effect of Al 2 O 3 addition on the microstructure and electrical properties of (Mn 0 , 37 Ni 0,3 Co 0 , 33 - x Al x )O 4 (0 x 0.03) NTC thermistors”, Materials Science and Engineering, B119, pp. 55-60, 2005. Wiendartun, D. G. Syarif, The Effect of TiO 2 Addition on the Characteristics of CuFe 2 O 4 Ceramics for NTC Thermistors, International Conference on Mathematics and Natural Sciences (ICMNS) 2006, ITB, Bandung, October 2006. The authors wish to acknowledge their deep gratitude to DIKTI, Department of National Education of Indonesian Government for financial support under Hibah PEKERTI program with contract No.014/SPP/PP/DP2M/II/2006 April 24, 2006 1 and HVACR (Heating, Ventilation, Air conditioning and Refrigeration). 2 • Application: Temperature sensor, electric current limiter, flowrate meter and pressure sensor. 3 • Most, thermistors are produced from spinel ceramics based on transition metal oxides forming general formula AB 2 O 4 4 • Predicted that the Al 2 O 3 addition can improve the characteristics of the CuFe 2 O 4 . ceramic for NTC thermistors. EXPERIMENT T(0C) t (minute) 500C 30’ 25’ HEAT TREATMENT CONCLUSION REFERENCES ACKNOWLEGMENT The relation between ln Electrical Resistivity and 1/T Electrical resistance as function of time as the result of ageing test
Transcript
Additive of Al O B
XRD profiles
of CuFe2O4
based-ceramics
Electrical Characteristics CuFe2O4 Ceramics With and WithoutAl2O3 for Negative Thermal Coefficient (NTC) Thermistor
R = Thermistor resistanceR0 = Resistance at the infinite temperatureB = Thermistor constantT = Temperature of thermistorEa = Activation energyk = The Boltzmann constantα = Sensitivity of thermistor
ELECTRICAL CHARACTERISTIC
IMPORTANT ELECTRONIC COMPONENT•Sectors : Biomedical, aerospace, instrumentation, communications, automotive and HVACR (Heating, Ventilation, Air conditioning and Refrigeration).
All CuFe2O4 base-ceramic crystallized in tetragonal structure. Thermistor constant (B) and sensitivity (a) of the CuFe2O4 base- ceramics
increase with the increase of Al2O3 concentration. This means that the additionof Al2O3 can be used as a controlling parameter. However, the addition of Al2O3 decreases the electrical stability of the
CuFe2O4 base-ceramics. Only sample without Al2O3 and that added with 1mole % Al2O3 fit the electrical stability condition.
Heating at 150oC for 200 hours can be used to make CuFe2O4 base-ceramicstable electrically.
E.S. Na, U.G. Paik, S.C.Choi, “The effect of a sintered microstructure on the electrical properties of a Mn-Co-Ni-O thermistor”, Journal of Ceramic Processing Research, Vol.2, No. 1, pp 31-34, 2001.
K. PARK, I.H. HAN, “Effect of Al2O3 addition on the microstructure and electrical properties of (Mn0,37Ni0,3Co0,33-xAlx)O4(0 x 0.03) NTC thermistors”, Materials Science and Engineering, B119, pp. 55-60, 2005.
Wiendartun, D. G. Syarif, The Effect of TiO2 Addition on the Characteristics of CuFe2O4 Ceramics for NTC Thermistors, International Conference on Mathematics and Natural Sciences (ICMNS) 2006, ITB, Bandung, October 2006.
The authors wish to acknowledge their deep gratitude to DIKTI, Department of National Education of Indonesian Government for financial support under Hibah PEKERTI program with contract No.014/SPP/PP/DP2M/II/2006 April 24, 2006
1•Sectors : Biomedical, aerospace, instrumentation, communications, automotive and HVACR (Heating, Ventilation, Air conditioning and Refrigeration).
2• Application: Temperature sensor, electric current limiter, flowrate meter and
pressure sensor.
3• Most, thermistors are produced from spinel ceramics based on transition metal
oxides forming general formula AB2O4
4• Predicted that the Al2O3 addition can improve the characteristics of the CuFe2O4 .
ceramic for NTC thermistors.
EXPERIMENT
T(0C)
t (minute)
500C
30’25’
HEAT TREATMENT
CONCLUSION
REFERENCES
ACKNOWLEGMENT
The relation between ln Electrical Resistivity and 1/T Electrical resistance as function of time as the result of ageing test
Additive of Al O B
XRD profiles
of CuFe2O4
based-ceramics
Electrical Characteristics CuFe2O4 Ceramics With and WithoutAl2O3 for Negative Thermal Coefficient (NTC) Thermistor
R = Thermistor resistanceR0 = Resistance at the infinite temperatureB = Thermistor constantT = Temperature of thermistorEa = Activation energyk = The Boltzmann constantα = Sensitivity of thermistor
ELECTRICAL CHARACTERISTIC
IMPORTANT ELECTRONIC COMPONENT•Sectors : Biomedical, aerospace, instrumentation, communications, automotive and HVACR (Heating, Ventilation, Air conditioning and Refrigeration).
All CuFe2O4 base-ceramic crystallized in tetragonal structure. Thermistor constant (B) and sensitivity (a) of the CuFe2O4 base- ceramics
increase with the increase of Al2O3 concentration. This means that the additionof Al2O3 can be used as a controlling parameter. However, the addition of Al2O3 decreases the electrical stability of the
CuFe2O4 base-ceramics. Only sample without Al2O3 and that added with 1mole % Al2O3 fit the electrical stability condition.
Heating at 150oC for 200 hours can be used to make CuFe2O4 base-ceramicstable electrically.
E.S. Na, U.G. Paik, S.C.Choi, “The effect of a sintered microstructure on the electrical properties of a Mn-Co-Ni-O thermistor”, Journal of Ceramic Processing Research, Vol.2, No. 1, pp 31-34, 2001.
K. PARK, I.H. HAN, “Effect of Al2O3 addition on the microstructure and electrical properties of (Mn0,37Ni0,3Co0,33-xAlx)O4(0 x 0.03) NTC thermistors”, Materials Science and Engineering, B119, pp. 55-60, 2005.
Wiendartun, D. G. Syarif, The Effect of TiO2 Addition on the Characteristics of CuFe2O4 Ceramics for NTC Thermistors, International Conference on Mathematics and Natural Sciences (ICMNS) 2006, ITB, Bandung, October 2006.
The authors wish to acknowledge their deep gratitude to DIKTI, Department of National Education of Indonesian Government for financial support under Hibah PEKERTI program with contract No.014/SPP/PP/DP2M/II/2006 April 24, 2006
1•Sectors : Biomedical, aerospace, instrumentation, communications, automotive and HVACR (Heating, Ventilation, Air conditioning and Refrigeration).
2• Application: Temperature sensor, electric current limiter, flowrate meter and
pressure sensor.
3• Most, thermistors are produced from spinel ceramics based on transition metal
oxides forming general formula AB2O4
4• Predicted that the Al2O3 addition can improve the characteristics of the CuFe2O4 .
ceramic for NTC thermistors.
EXPERIMENT
T(0C)
t (minute)
500C
30’25’
HEAT TREATMENT
CONCLUSION
REFERENCES
ACKNOWLEGMENT
The relation between ln Electrical Resistivity and 1/T Electrical resistance as function of time as the result of ageing test
Additive of Al O B
XRD profiles
of CuFe2O4
based-ceramics
Electrical Characteristics CuFe2O4 Ceramics With and WithoutAl2O3 for Negative Thermal Coefficient (NTC) Thermistor
R = Thermistor resistanceR0 = Resistance at the infinite temperatureB = Thermistor constantT = Temperature of thermistorEa = Activation energyk = The Boltzmann constantα = Sensitivity of thermistor
ELECTRICAL CHARACTERISTIC
IMPORTANT ELECTRONIC COMPONENT•Sectors : Biomedical, aerospace, instrumentation, communications, automotive and HVACR (Heating, Ventilation, Air conditioning and Refrigeration).
All CuFe2O4 base-ceramic crystallized in tetragonal structure. Thermistor constant (B) and sensitivity (a) of the CuFe2O4 base- ceramics
increase with the increase of Al2O3 concentration. This means that the additionof Al2O3 can be used as a controlling parameter. However, the addition of Al2O3 decreases the electrical stability of the
CuFe2O4 base-ceramics. Only sample without Al2O3 and that added with 1mole % Al2O3 fit the electrical stability condition.
Heating at 150oC for 200 hours can be used to make CuFe2O4 base-ceramicstable electrically.
E.S. Na, U.G. Paik, S.C.Choi, “The effect of a sintered microstructure on the electrical properties of a Mn-Co-Ni-O thermistor”, Journal of Ceramic Processing Research, Vol.2, No. 1, pp 31-34, 2001.
K. PARK, I.H. HAN, “Effect of Al2O3 addition on the microstructure and electrical properties of (Mn0,37Ni0,3Co0,33-xAlx)O4(0 x 0.03) NTC thermistors”, Materials Science and Engineering, B119, pp. 55-60, 2005.
Wiendartun, D. G. Syarif, The Effect of TiO2 Addition on the Characteristics of CuFe2O4 Ceramics for NTC Thermistors, International Conference on Mathematics and Natural Sciences (ICMNS) 2006, ITB, Bandung, October 2006.
The authors wish to acknowledge their deep gratitude to DIKTI, Department of National Education of Indonesian Government for financial support under Hibah PEKERTI program with contract No.014/SPP/PP/DP2M/II/2006 April 24, 2006
1•Sectors : Biomedical, aerospace, instrumentation, communications, automotive and HVACR (Heating, Ventilation, Air conditioning and Refrigeration).
2• Application: Temperature sensor, electric current limiter, flowrate meter and
pressure sensor.
3• Most, thermistors are produced from spinel ceramics based on transition metal
oxides forming general formula AB2O4
4• Predicted that the Al2O3 addition can improve the characteristics of the CuFe2O4 .
ceramic for NTC thermistors.
EXPERIMENT
T(0C)
t (minute)
500C
30’25’
HEAT TREATMENT
CONCLUSION
REFERENCES
ACKNOWLEGMENT
The relation between ln Electrical Resistivity and 1/T Electrical resistance as function of time as the result of ageing test
