Research Of Low Cost Thick Film Heating Material And Heating Element

In this paper, Traditional precious metals and high thick paste thick film heating elements heat the question of Expensive price been studied, In order to reduce costs. The reason why traditional precious metal thick film heating elements rates at a fancy price,is the resistance layer using a precious metals as Heating material. In order to reduce production costs, Inexpensive function phase which Replace these precious metals capabilities is very necessary to be studied.The feasibility study has been carried out from different angels, as YBCO(YBa2Cu3O7-x) is used as function phase.Conductivity has been tested, the measured room temperature conductivity of the best 5.238×105 S/m, which is very appropriate for function phase of thick film heater. The resistance-temperature coefficient(TCR) of YBCO has been tested. The TCR coefficient shows negative consistency-temperature coefficient. The preparation conditions of YBCO were optimized, the most suitable peak sintering temperature is 930℃.The feasibility study has been carried out from different angels, as LSMO(La0.7Sr0.3MnO3) is used as function phase. Conductivity has been tested, the measured room temperature conductivity of the best 8.051×105 S/m, which is very appropriate for function phase of thick film heater. The resistance-temperature coefficient(TCR) of YBCO has been tested. The TCR coefficient shows negative consistency-temperature coefficient. The preparation conditions of LSMO were optimized, the most suitable peak sintering temperature is 1200℃.The feasibility study has been carried out from different angels,as ZnO +1.5mol%Al2O3 is used as function phase. Conductivity has been tested, the measured room temperature conductivity of the best 0.79 Ω ? cm with Special Silver Electrode. Schottky barrier is causing the high resistance.The preparation conditions of ZnO were optimized, the most suitable peak sintering temperature is 1200℃.Screen printing process has been used to prepare resistance layer. The preparation of organic carrier has been studied. The preparation condition of resistance layer has been optimized. Three layers should be printed to ensure the resistance layer sufficient thickness through numbers of sintering experiments.YBCO thick film heating resistor were prepared The holding time should more than 120 min to ensure the resistance layer have enough time Sintering. The sintering condition of thick film heater has been studied. Sheet resistance is 80.5 Ω/□ when the peak sintering temperature is 800 ℃, holding time is 120 min, satisfied with the requirements of the thick film heater. The TCR coefficient is-1063.857 ppm/℃,shows negative consistency-temperature coefficient.LSMO thick film heating resistor were prepared The holding time should more than 120 min to ensure the resistance layer have enough time Sintering. The sintering condition of thick film heater has been studied. Sheet resistance is 56.88 Ω/□ when the peak sintering temperature is 1100 ℃, holding time is 120 min, satisfied with the requirements of the thick film heater. The TCR coefficient is-2258.59 ppm/℃,shows negative consistency-temperature coefficient.ZnO thick film heating resistor be equipped with a special electrode paste and is required under N2 atmosphere sintering,t discussed in mind the need for low cost.The thermal expansion coefficient has been studied. The thermal expansion coefficient of YBCO thick film is 14.4942×10-6/K The thermal expansion coefficient of LSMO thick film is 13.7×10-6/K The thermal expansion coefficient of Alumina substrate is 7.6056×10-6/K. Functional material and the substrate can better match. Performance of thick film heating elements to be tested, The results show the thick film heating element can be effectively work.